044822_1 HP 8444A Tracking Generator User Manual

User Manual: HP 8444A Tracking Generator User Manual

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TM 11-6625-2866-14&P

TECHNICAL MANUAL

OPERATOR'S, ORGANIZATIONAL, DIRECT SUPPORT,

AND GENERAL SUPPORT

MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)

FOR

GENERATOR, TRACKING SG-1125/U

(HEWLETT-PACKARD MODEL 8444A)

(NSN 6625-00-185-4802)

HEADQUARTERS, DEPARTMENT OF THE ARMY

29 FEBRUARY 1980

TM 11-6625-2866-14&P

C 1

CHANGE HEADQUARTERS

DEPARTMENT OF THE ARMY

No. 1 WASHINGTON, DC, 28 August 1980

Operator's, Organizational, Direct Support, and General Support

Maintenance Manual

(Including Repair Parts and Special Tools Lists)

For

GENERATOR, TRACKING SG-1125/U

(HEWLETT-PACKARD MODEL 8444A)

(NSN 6625-00-185-4802)

TM 11-6625-2866-14&P, 29 February 1980, is changed as follows:

1. Remove old pages and insert new pages as indicated below:

Remove Insert

None ..............................................................................6-9 through 6-11/(6-12 blank)

F-1 .................................................................................F-1 through F-3/(F-4 blank)

G-1 ................................................................................G-1 and G-2

None ..............................................................................H-3 through H-5/(H-6 blank)

2. File this sheet in front of the manual for reference purposes.

}

By Order of the Secretary of the Army:

E. C. MEYER

General, United States Army

Official: Chief of Staff

J. C. PENNINGTON

Major General, United States Army

The Adjutant General

Distribution:

Active Army:

HISA (Ft Monmouth) (21) USAICS (3)

USAINSCOM (2) MAAG (1)

COE (1) USARMIS (1)

TSG (1) USAERDAA (1)

USAARENBD (1) USAERDAW (1)

DARCOM (1) Fort Gordon (10)

TRADOC (2) Fort Carson (5)

OS Maj Comd (4) Army Dep (1) except

TECOM (2) LBAD (14)

USACC (4) SAAD (30)

MDW (1) TOAD (14)

Armies (2) SHAD (3)

Corps (2) Fort Gillem (10)

Svc Colleges (1) USA Dep (1)

USASIGS (5) Sig Sec USA Dep (1)

USAADS (2) Fort Richardson (CERCOM Ofc) (2)

USAFAS (2) Units org under fol TOE:

USAARMS (2) (2 copies each unit)

USAIS (2) 29-207

USAES (2) 29-610

ARNG: None

USAR: None

For explanation of abbreviations used, see AR 310-50.

This manual contains copyright material reproduced by permission of the Hewlett-Packard Company.

TM 11-6625-2866-14&P

TECHNICAL MANUAL HEADQUARTERS

DEPARTMENT OF THE ARMY

No. 11-6625-2866-14&P WASHINGTON, DC,

29 February 1980

OPERATOR'S, ORGANIZATIONAL, DIRECT

SUPPORT, AND GENERAL SUPPORT

MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)

FOR

GENERATOR, TRACKING SG-1 125/U

(HEWLETT-PACKARD MODEL 8444A)

(NSN 6625-00-185-4802)

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can improve this manual by recommending improvements using DA Form 2028-2 (Test) located in

the

back of the manual. Simply tear out the self-addressed form, fill it out as shown on the sample, fold it where

shown, and drop it in the mail. If there are no blank DA Forms 2028-2 (Test) in the back of your manual, use

the standard DA Form 2028 (Recommended Changes to Publications and Blank Forms) and forward to the

Commander, US Army Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-ME-

MQ, Fort Monmouth, NJ 07703.

In either case a reply will be furnished direct to you.

This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to

cover the data required to operate and maintain this equipment. Since the manual was not prepared in accordance with

military specifications, the format has not been structured to consider levels of maintenance.

}

TM 11-6625-2866-14&P

TABLE OF CONTENTS

Section Page

0. INTRODUCTION .....................................0-1

I. GENERAL INFORMATION........................1-1

1-1.Introduction......................................1-1

1-5.Safety Considerations......................1-1

1-16.Instruments Covered by Manual.......1-2

1-18.Description ......................................1-2

1-21.8554B RF Section Modifications.......1-4

1-23.Accessories Supplied.......................1-4

1-25.Operating Accessories......................1-4

1-27.Warranty..........................................1-4

1-29.Recommended Test Equipment.......1-4

II. INSTALLATION.........................................2-1

2-1.Initial Inspection...............................2-1

2-2.Mechanical Check............................2-1

2-4.Electrical Check ..............................2-1

2-6.Claims for Damage. .......................2-1

2-9.Preparation for Use. .......................2-1

2-10.Power Requirements........................2-1

2-13.Power Cable.....................................2-1

2-16.Operating Environment....................2-1

2-18.Installation Connections....................2-2

2-21.Storage and Shipment......................2-2

2-22.Original Packaging ..........................2-2

2-26.Other Packaging Materials...............2-2

III. OPERATION ...........................................3-1

3-1.Introduction......................................3-1

3-3.Panel Features.................................3-1

3-5.Operator's Checks............................3-1

3-7.Operating Instructions......................3-1

3-9.Controls, Indicators and Connectors.3-1

3-11. Operating Techniques......................3-1

3-13.Crystal Filter Measurement...............3-8

3-15.Bandpass Filter Measurement..........3-8

3-17.Low-Pass Filter Measurement..........3-8

3-19.Swept Return Loss Measurement.....3-9

3-21.Amplifier Gain and Bandwidth

Measurement.............................3-9

3-23.Precision Frequency Measurements .3-9

IV. PERFORMANCE TESTS..........................4-1

4-1.introduction .....................................4-1

4-3.Equipment Required.........................4-1

4-5.Front Panel Checks..........................4-1

4-7.Preset Adjustments (8554B/8552B

Section Page

141T/84, 44A System............................

4-9.Preset Adjustments (8555A/8552B/

141T/8444A System)........................4-2

4-11.Performance Tests...........................4-2

4-16.Output Level.....................................4-3

4-17.Frequency Stability ..........................4-5

4-18.System Flatness ..............................4-9

4-19.-Frequency Accuracy......................4-11

4-20.Harmonic Distortion........................4-13

V. ADJUSTMENTS .5....................................5-1

5-1.Introduction......................................5-1

5-4.Equipment Required.........................5-1

5-6.Factory Selected Components..........5-1

5-8.Power Supply, Check and Adjustment 5-1

5-9.1.55 GHz Oscillator Power Level,

Frequency Check & Adjustment.......5-4

5-10.1.55 GHz Oscillator Residual

FM Check . .....................................5-6

5-11.First Converter Check and

Adjustment ......................................5-9

5-12.Automatic Level Control (ALC)

Check and Adjustment ..................5-11

5-13.Level Control Calibration Check

and Adjustment .............................5-13

VI. REPLACEABLE PARTS............................6-1

6-1.Introduction......................................6-1

6-3.Abbreviations...................................6-1

6-5.Replaceable Parts List......................6-1

6-7.Ordering Information........................6-1

VII. MANUAL CHANGES.................................7-1

7-1.Introduction......................................7-1

7-5.Manual Change Instructions ............7-1

VIII.SERVICE ..................................................8-1

8-1.Introduction......................................8-1

8-3.Principles of Operation ....................8-1

8-5.Recommended Test Equipment ......8-1

8-7.Troubleshooting................................8-1

8-11.Repair ............................................8-1

8-20.General Service Hints......................8-2

8-23.General Service Information.............8-4

8-28.Operational Amplifiers......................8-5

8-31.Electrical Maintenance.....................8-6

TM 11-6625-2866-14&P

Contents LIST OF ILLUSTRATIONS

Figure Page

1-1. Model 8444A Tracking Generator and

Accessories . .......................................1-0

1-2. Instrument Identification ..............................1-2

2-1. Power Cable Line Connector Labels. . ........2-2

3-1. Model 8444A Tracking Generator Front Panel

Controls, Indicators and Connectors ......3-2

3-2. Model 8444A Tracking Generator Rear Panel

Controls and Connectors ......................3-3

3-3. Tracking Generator Operation with 8554B

Spectrum Analyzer ...............................3-4

3-4. Tracking Generator Operation with 8555A

Spectrum Analyzer ...............................3-6

3-5. 20 MHz. Crystal Filter CRT Display..............3-8

3-6. 50 MHz. Bandpass Filter CRT Display ........3-8

3-7. 23 MHz Low-Pass Gilter CRT Display..........3-9

3-8. Swept Return Loss Measurement

CRT Display..........................................3-9

3-9. Amplifier Gain and Bandwidth CRT Display. 3-9

3-10. Precision Frequency Measurement

CRT Display..........................................3-10

4-1. Output Level & Flatness Test Setup.4-3

4-2. Residual FM Test Setup ..............................4-7

4-3. Demodulation Sensitivity Measurement.......4-8

4-4. System Flatness Test Setup .......................4-9

4-5. Frequency Accuracy Test Setup ..................4-11

4-6. Harmonic Distortion Test Setup ...................4-13

4-7. Typical Harmonic Distortion CRT Display

0 to 100 MHz.........................................4-15

4-8. Typical Harmonic Distortion CRT Display

0 to 500 MHz ........................................4-15

5-1. Power Supply Check and Adjustment

Test Setup ............................................5-2

5-2. 1.55 GHz LO Power Level and Frequency

Check and Adjustment Test Setup ........5-4

5-3. 1.55 GHz LO Residual FM Check Test Setup.....5-6

5-4. Demodulation Sensitivity Measurement .....5-8

5-5. First Converter Check and Adjustment Test

Setup.....................................................5-9

5-6. First Converter Passband CRT Display........5-10

5-7. Automatic Level Control (ALC) Check and

Adjustment Test Setup.................................5-11

5-8. Level Control Calibration Check and Adjust-

ment Test Setup....................................5-13

7-1. 1.55 GiHz LO Power Level and Check and

Adjustment Test Setup ..........................7-2

Figure Page

7-2. First Converter Circuits, Schematic Diagram ..7-5

7-3. A7 1.55 GHz Oscillator Assembly,

Illustrated Parts Breakdown ................7-6

8-1. Transistor Operation. ..............................8-5

8-2. Examples of Diode and Transistor Marking

Methods .............................................8-6

8-3. Operational Amplifier Equivalent Circuit . .8-7

8-4. Major Assembly Locations. . ..................8-9

8-5. Adjustment and Test Point Locations........8-9

8-6. Tracking Generator Spectrum Analyzer,

Simplified Block Diagram . ...............8-10

8-7. Tracking Generator Block Diagram with

Spectrum Analyzer Interconnections...8-11

8-7A. Troubleshooting Tree . ...........................8-12

8-8. Tracking Generator Troubleshooting

Block Diagram. . ..............................8-13

8-9. Mixer Diode Forming Dimensions in Inches . ..8-14

8-10. Modulator/Oscillator Driver Assy A2

Component Locations . ....................8-15

8-11. Amplifier and Pin Diode Modulator Assy

A4A1 Component Locations . ...........8-15

8-12. First Converter Circuits

Schematic Diagram............................8-15

8-13. J1 RF Output Connector, Exploded View..8-16

8-14. A2 Modulator/Oscillator Driver Assy,

Component Location ........................8-17

8-15. Second Converter Circuits,

Schematic Diagram ..........................8-17

8-16. Al Power Supply Assy, Component Location...8-19

8-17. Power Supply and Input Circuit,

Schematic Diagram............................8-19

8-18. A5 First Converter Assembly

Illustrated Parts Breakdown ................8-20

8-19. A71.55GHz Oscillator Assembly

Illustrated Parts Breakdown ................8-21

D-1. 500 MHz LO Mounting Location and Output

Port for the 8444A, Option 058 ...........D-6

D-2. Location of 500 MHz LO OUTPUT BNC

Connector Added on Rear Panel of

the 8444A, Option 058........................D-7

D-3. A9 500 MHz Oscillator Assembly, Schematic..D-8

iii

TM 11-6625-2866-14&P

Contents LIST OF TABLES

Table Page

1-1. System Specifications...............................1-3

1-2. Accessories Supplied................................1-4

1-3. Test Equipment and Accessories . ..........1-5

1-4. Operating Accessories ............................1-7

4-1. Performance Test Record . .....................4-16

5-1. Check and Adjustment Test Card ............5-15

6-1. Reference Designations and Abbreviations. ....6-2

6-2. Replaceable Parts ....................................6-4

6-3. Code List of Manufacturers.......................6-8

6-4. Part Number-National

Stock Number Cross

Reference Index .......................................6-9

Table Page

7-1. Manual Changes by Serial Number...........7-1

8-1. Factory Selected Components..................8-2

8-2. Adjustable Components . .......................8-2

8-3. Schematic Diagram Notes . ....................8-3

8-4. Etched Circuit Soldering Equipment..........8-4

D-1. 8444A System Specifications With Option 058 D-1

D-2. Replaceable Parts ....................................D-4

APPENDIXES

A. SERVICE NOTE-P-09602038,

P-5086-6025 ............................................A-1

B. SERVICE NOTE-P-08444-60019..............B-1

C. SERVICE NOTE-8444A-1 ........................C-1

D. MODEL 8444A TRACKING GEN-

ERATOR, OPTION 058 ...........................D-1

E. REFERENCES ........................................E-1

F. COMPONENTS OF END ITEM

LIST .........................................................F-1

G. ADDITIONAL AUTHORIZA-

TION LIST ...............................................G-1

H. MAINTENANCE ALLOCATION ................H-1

I. REPAIR PARTS AND SPECIAL

TOOLS LISTS .........................................I-1

TM 11-6625-2866-14&P

Figure 1-1. Model 8444A Tracking Generator and Accessories

1-0

TM 11-6625-2866-14&P

SECTION 0

INTRODUCTION

0-1. SCOPE

This manual describes Generator, Tracking SG-1125/U

(Hewlett Packard Model 8444A) and provides

instructions for operation and maintenance.

0-2. INDEXES OF PUBLICATIONS

a. DA Pam 310-4. Refer to the latest issue of DA

Pam 310-4 to determine whether there are new editions,

changes, or additional publications pertaining to the

equipment.

b. DA Pam 310-7. Refer to DA Pam 310-7 to

determine whether there are modification work orders

(MWO's) pertaining to the equipment.

0-3. MAINTENANCE FORMS, RECORDS, AND

REPORTS

a. Reports of Maintenance and Unsatisfactory

Equipment. Department of the Army forms and

procedures used for equipment maintenance will be

those described by TM 38-750, The Army Maintenance

Management System.

b. Report of Packaging and Handling Deficiencies.

Fill out and forward DD Form 6 (Packaging

Improvement Report) as prescribed in AR 700-

58/NAVSUPINST 4030.29/AFR 71-13/MCO

P4030.29A, and DLAR 4145.8.

c. Discrepancy in Shipment Report (DISREP) (SF

361). Fill out and forward Discrepancy in Shipment

Report (DISREP) (SF 361) as prescribed in AR 55-

38/NAVSUPINST 4610.33B/AFR 75-18/MCO

P4610.19C and DLAR 4500.15.

0-4. REPORTING EQUIPMENT IMPROVEMENT

RECOMMENDATIONS (EIR)

EIR can and must be submitted by anyone who is aware

of an unsatisfactory condition with the equipment design

or use. It is not necessary to show a new design or list a

better way to perform a procedure; just simply tell why

the design is unfavorable or why a procedure is difficult.

EIR may be submitted on SF 368 (Quality Deficiency

Report). Mail direct to Commander, US Army

Communications and Electronics Materiel Readiness

Command, ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ

07703. A reply will be furnished to you.

0-5. ADMINISTRATIVE STORAGE

Administrative storage of equipment issued to and used

by Army activities shall be in accordance with paragraph

.2-16.

0-6. DESTRUCTION OF ARMY ELECTRONICS

MATERIEL

Destruction of Army electronics materiel to prevent

enemy use shall be in accordance with TM 750-244-2.

0-1

Model 8444A TM 11-6625-2866-14&P

General Information

SECTION I

GENERAL INFORMATION

1-1. INTRODUCTION

1-2. This manual contains all information required to

install, operate, test, adjust and service the Hewlett-

Packard Model 8444A Tracking Generator. This section

covers instrument identification, description, options,

accessories, specifications and other basic information.

1-3. Figure 1-1 shows the Hewlett-Packard Model

8444A Tracking Generator with accessories supplied.

1-4. The various sections in this manual provide

information as follows:

SECTION II, INSTALLATION, provides

information relative to incoming inspection, power

requirements, mounting, packing and shipping,

etc.

SECTION III, OPERATION, provides information

relative to operating the instrument.

SECTION IV, PERFORMANCE TESTS, provides

information required to ascertain that the

instrument is performing in accordance with

published specifications.

SECTION V, ADJUSTMENTS, provides

information required to properly adjust and align

the instrument after repairs are made.

SECTION VI, REPLACEABLE PARTS, provides

ordering information for all replaceable parts and

assemblies.

SECTION VII, MANUAL CHANGES, normally will

contain no relevant information in the original

issue of a manual. This section is reserved to

provide back-dated and up-dated information in

manual revisions or reprints.

SECTION VIII, SERVICE, includes all information

required to service the instrument.

1-5. SAFETY CONSIDERATIONS

1-6. General

1-7. This is an International Electrotechnical

Commission Safety Class I instrument. This instrument

has been designed and tested according to IEC

Publication 348, "Safety Requirements for Electronic

Measuring Apparatus, " and has been supplied in safe

condition.

1-8. Operation

1-9. BEFORE APPLYING POWER, make sure the

instrument's ac input is set for the available ac line

voltage, that the correct fuse is installed, and that all

normal safety precautions have been taken.

1-10. Service

1-11. Although the instrument has been designed in

accordance with international safety standards, the

information, cautions, and warnings in this manual must

be followed to ensure safe operation and to keep the

instrument safe. Service and adjustments should be

performed only by qualified service personnel.

1-12. Adjustment or repair of the opened instrument

with the ac power connected should be avoided as much

as possible and, when inevitable, should be performed

only by a skilled person who knows the hazard involved.

1-13. Capacitors inside the instrument may still be

charged even though the instrument has been

disconnected from its source of supply.

1-14. Make sure only fuses of the required current

rating and type (normal blow, time delay, etc.) are used

for replacement. Do not use repaired fuses or short

circuit the fuse holders.

1-15. Whenever it is likely that the protection has been

impaired, make the instrument inoperative and secure it

against any unintended operation.

WARNING

If this instrument is to be energized through an

autotransformer (for voltage reduction), make sure

the common terminal is connected to the earthed

pole of the power source.

BEFORE SWITCHING ON THE INSTRUMENT,

the protective earth terminals of the instrument

must be connected to the protective conductor of

the mains power cord. The mains plug shall only

be inserted in a socket outlet provided with

1-1

Model 8444A TM 11-6625-2866-14&P

General Information

protective earth contact. The protection must not be

negated by using an extension cord (power cable)

without a protective grounding conductor.

Interruption of the protective (grounding) conductor,

inside or outside the instrument, or disconnection of

the protective earth terminal is likely to make this

instrument dangerous. Intentional interruption of the

earth ground is prohibited.

Servicing this instrument often requires that you

work with the instrument's protective covers

removed and with ac power connected. Be very

careful; the energy at many points in the instrument

may, if contacted, cause personal injury.

With the ac power cable connected, the ac line

voltage is present at the terminals of the power line

module and at the LINE power switch. Be very

careful. Bodily contact with this voltage can be

fatal.

CAUTIONS

BEFORE SWITCHING ON THIS INSTRUMENT,

make sure instrument's ac input is set to the voltage

of the ac power source.

BEFORE SWITCHING ON THIS INSTRUMENT,

make sure that all devices connected to the

instrument are connected to the protective earth

ground.

BEFORE SWITCHING ON THIS INSTRUMENT,

make sure the line power (mains) plug is connected

to a threeconductor line power outlet that has a

protective (earth) ground. (Grounding one

conductor of a two-conductor outlet is not sufficient.

BEFORE SWITCHING ON THIS INSTRUMENT,

make sure the ac line fuse is of the required current

rating and type (normal-blow, time-delay, etc.).

1-16. INSTRUMENTS COVERED BY MANUAL

1-17. Hewlett-Packard instruments carry a serial

number (see Figure 1-2) on the back panel. When 1-2

the serial number prefix on the instrument serial number

plate of your instrument is the same as one of the prefix

numbers on the inside title page of this manual, the

manual applies directly to the instrument. When the

instrument serial number prefix is not listed on the inside

title page of initial issue, manual change sheets and

manual up-dating information is provided. Later editions

or revisions to the manual will contain the required

change information in Section VII.

Figure 1-2. Instrument Identification

1-18. DESCRIPTION

1-19. The Model 8444A Tracking Generator is designed

to complement both Model 8554B and Model 8555A

Spectrum Analyzer RF Sections. The Tracking

Generator covers the frequency range of 500 kHz to

1250 MHz when used with the 8554B RF Section and

from 10 MHz to 1.3 GHz when used with the 8555A RF

Section. The Tracking Generator/Spectrum Analyzer

functions as a system to perform frequency response

measurements. Additionally, the system can be used as

a signal generator or sweeper to supply a test signal to

other devices. An auxilliary output is provided for

precision frequency measurements by an external

frequency counter.

1-20. The Tracking Generator converts the first and

third local oscillator (LO) signals from the Spectrum

Analyzer RF Section, to a signal that tracks the

frequency tuning of the RF Section. With the Spectrum

Analyzer operating in ZERO SCAN WIDTH, the

Tracking Generator is a CW signal generator, tuned to

the frequency of the analyzer.

In FULL or PER DIVISION SCAN WIDTH the Tracking

Generator functions as a sweep oscillator which tracks

the analyzer tuning. Additionally, a

1-2

Model 8444A TM 11-6625-2866-14&P

General Information

Table 1-1. System Specifications

These system specifications describe the performance available from the

spectrum analyzer-tracking generator system in various types of

applications. In all cases it is assumed that the spectrum analyzer is

equipped with either an 8554B or 8555A Tuning Section, 8552A or 8552B

IF Section, 140T or 141T Display Section.

SWEPT FREQUENCY RESPONSE MEASUREMENTS The tracking

generator is used as a signal source to measure the frequency response

of a device.

Dynamic Range: > 90 dB from spectrum analyzer 1 dB gain

compression point to average noise level (approximately -10 dBm to

-100 dBm). Spurious responses not displayed.

Gain Compression: For -10 dBm signal level at the input mixer, gain

compression < 1 dB.

Average Noise Level: > -102 dBm with 10 kHz IF bandwidth.

Absolute Amplitude Calibration Range:

Spectrum Analyzer: Log: From -122 dBm to +10 dBm, 10 dB/div

on a 70 dB display or 2 dB/div on a 16 dB display (8552A has 10

dB/div only).

Linear: From 0.1 pV/div to 100 mV/div (8555A), 20 mV/div (8554B)

in a 1, 2 sequence on an 8division display.

Tracking Generator (Drive Level to Test Device): 0 to -10 dBm

continuously variable. 0 dBm calibrated to +0.5 dB at 30 MHz.

Frequency Range: 500 kHz to 1250 MHz with 8554B and 10 MHz

to 1300 MHz with 8555A.

Scan Width (Determined by Spectrum Analyzer Controls):

Per Division: With 8555A, 16 calibrated scan widths from a 2

kHz/div to 200 MHz/div in a 2, 5, 10 sequence. With 8554B, 15

calibrated scan widths from a 2 kHz/div to 100 MHz/div in 2, 5, 10

sequence.

Full Scan: 0--1250 MHz with 8554B; 0-1300 MHz with 8555A.

Zero Scan: Analyzer is fixed tuned receiver.

Frequency Resolution: 1 kHz.

Stability:

Residual FM (peak to peak):

Tuning Section Stabilized Unstabilized

8554B/8555A 200 Hz 10 kHz

Amplitude Accuracy:

System Frequency Response: +1.5 dB.

Tracking Generator Calibration: 0 dBm at 30 MHz to +0.5 dB.

SWEEP/CW GENERATOR

The tracking generator-spectrum analyzer system can be used to supply

test signals for other devices as a sweeper.

Frequency: Controlled by spectrum analyzer. Range is 500 kHz to 1250

MHz with the 8554B and 10 MHz to 1300 MHz with the 8555A.

Frequency Accuracy: +10 MHz (8554B), +15 MHz (8555A) using

spectrum analyzer tuning dial. Can be substantially improved using

external counter output.

Spectral Purity:

Residual FM (peak-to-peak):

Tuning Section Stabilized Unstabilized

8554B/8555A 200 Hz 10 kHz

Harmonic Distortion: 25 dB below output

level.

Nonharmonic (spurious) Signals: >40 dB below

output level.

Flatness: +/- 0.5 dB.

Long Term Stability: Drift typically less than 30 kHz/hour when

stabilized after 2-hour warmup.

Sweep Width: 20 kHz to 1250 MHz (8554B) or 1300 MHz (8555A).

Sweep Rates: Selected by Scan Time per Division on spectrum

analyzer. 16 internal scan rates from 0.1 msec/div to 10 sec/div in a

1, 2, 5 sequence. Manual Scan is available with the external sweep

voltage from the 8444A or by a front panel control of the 8552B IF

Section.

PRECISION FREQUENCY MEASUREMENTS

An external counter output is provided on the 8444A for precision

frequency measurements. The frequency of unknown signals as well as

the frequency of any point on a frequency response curve can be

measured. The use of the HP 5300A/5303A Counter is suggested for

frequency measurements to 500 MHz and the HP 5245L/5254C Counter

for measurements to 1300 MHz.

Frequency Accuracy:

For unknown signals +10 kHz. (Tracking drift typically 5 kHz/10

min after 2-hour warmup.)

For points on frequency response curve. Counter

accuracy ±Residual FM.

Counter Mode of Operation:

Manual Scan: Scan determined either by front panel control of

8552B IF Section or by external scan signal provided by

the 8444A.

Zero Scan: Analyzer is fixed tuned receiver. Counter reads

center frequency to accuracy of tracking drift.

Counter Output Level: 0.1 V rms.

GENERAL SPECIFICATIONS

Temperature Range: Operation, 0 to 550C, storage -40°C to 75 C.

Power: 115V and 230V, 48 to 440 Hz, 12 watts max.

1-3

Model 8444A TM 11-6625-2866-14&P

General Information

MANUAL SCAN control on the Tracking Generator

allows manual tuning of the Spectrum Analyzer/Tracking

Generator System. The amplitude of the Tracking

Generator output is adjustable over a 0 to -10 dBm

range by a front panel vernier control. The output level

is calibrated at 30 MHz to 0 +/- 0.5 dBm and maintained

by an automatic level control circuit. Refer to Table 1-1

for system performance specifications.

1-21. 8554L RF SECTION MODIFICATIONS

1-22. Hewlett-Packard Model 8554L Spectrum Analyzer

RF Section with serial prefixes 1101A and below require

modification for Tracking Generator compatibility. The

modification consists of adding two cables to the RF

Section. The cables provide front panel access to the

first and third LO outputs. The modification kit, HP Part

Number 08554-60056, containing all necessary parts

and information is available from any Hewlett-Packard

Sales and Service Office. (A list of Sales and Service

offices is contained in the back of this manual.) Service

Note 8554L-6 containing the modification procedure is

included with the modification kit. After modification,

the Service Note should be filed with the 8554L Service

Manual.

1-23. ACCESSORIES SUPPLIED

1-24. Accessories supplied with the Tracking Generator

are listed in Table 1-2. RF cables, supplied with the

Tracking Generator, allow operation with either the

8554B or 8555A Spectrum Analyzer RF Sections. The

power cable, supplied with the instrument, is selected at

time of shipment. Cable selection is based on shipping

destination. Figure 2-1 illustrates the different power

cable connectors that are currently available.

1-25. OPERATING ACCESSORIES

1-26. In addition to the accessories supplied with the

Tracking Generator, a Spectrum Analyzer System is

required to complete the Tracking Generator Spectrum

Analyzer System. The Tracking Generator is

compatible with either the 8554B/8552( )/140-series

Spectrum Analyzer System or the 8555A/8552( )/140-

series Spectrum Analyzer System. Refer to paragraph

1-11 for modifications to early model Spectrum Analyzer

Systems. For precision frequency measurements a

frequency counter is required for use with the Tracking

Generator/Spectrum Analyzer System. Operating

accessories are listed in Table 1-4.

1-27. WARRANTY

1-28. The Hewlett-Packard Model 8444A Tracking

Generator is warranted and certified as indicated on the

inner front cover of this manual. For further information

contact the nearest Hewlett Packard Sales and Service

office; addresses are provided at the back of this

manual.

1-29. RECOMMENDED TEST EQUIPMENT

1-30. Table 1-3 lists the test equipment and accessories

required to check, adjust, and repair the Tracking

Generator. If substitute equipment is used, it must meet

the Minimum Specifications listed in Table 1-3.

Table 1-2. Accessories Supplied

HP Part Number Name Description

8120-1348* Line Power Cable 71 feet, 3 wire AC Line Cord

08444-60017 Interconnect Cable Coaxial cable for interconnection between AUX "A" connector

on Display Section and THIRD LO INPUT on Tracking Generator.

For use with 8555A Spectrum Analyzer System.

08444-60018 Interconnect Cable 18-inch low leakage coaxial cable with BNC connectors. Three

(3) each supplied. Two required for 8555A Spectrum Analyzer

System. Three required for 8554B Spectrum Analyzer System.

Connects FIRST LO to FIRST LO, THIRD LO to THIRD LO

and SCAN OUTPUT to SCAN IN/OUT.

*See paragraph 2-15 and Figure 2-1.

1-4

Model 8444A TM 11-6625-2866-14&P

General Information

Table 1-3. Test Equipment and Accessories (1 of 3)

1-5

Model 8444A TM 11-6625-2866-14&P

General Information

Table 1-3. Test Equipment and Accessories (2 of 3)

1-6

Model 8444A TM 11-6625-2866-14&P

General Information

Table 1-3. Test Equipment and Accessories (3 of 3)

Table 1-4. Operating Accessories

1-7/(1-8)

Model 8444A TM 11-6625-2866-14&P

Installation

SECTION II

INSTALLATION

2-1. INITIAL INSPECTION

2-2. Mechanical Check

2-3. Check the shipping carton for evidence of damage

immediately after receipt. If there is any visible damage

to the carton, request the carrier's agent be present

when the instrument is unpacked. Inspect the

instrument for physical damage such as bent or broken

parts and dents or scratches. If damage is found refer

to paragraph 2-6 for recommended claim procedures. If

the instrument appears to be undamaged, perform the

electrical check (see paragraph 2-4). The packaging

material should be retained for possible future use.

2-4. Electrical Check

2-5. The electrical check consists of following the

performance test procedures listed in Section IV. These

procedures allow the operator to determine that the

instrument is, or is not, operating within the

specifications listed in Table 1-1. The initial

performance and accuracy of the instrument are

certified as stated on the inside front cover of this

manual. If the instrument does not operate as specified,

refer to paragraph 2-6 for the recommended claim

procedure.

2-6. CLAIMS FOR DAMAGE

2-7. If physical damage is found when the instrument is

unpacked, notify the carrier and the nearest Hewlett-

Packard Sales and Service office immediately. The

Sales and Service office will arrange for repair or

replacement without waiting for a claim to be settled

with the carrier.

2-8. The warranty statement for the instrument is on the

inside front cover of this manual. Contact the nearest

Sales and Service office for information about warranty

claims.

2-9. PREPARATION FOR USE

CAUTION

Before applying power, check the power selector

switch on the Tracking Generator input power

module (rear panel) for proper position (115 or

230 volts).

2-10. Power Requirements

2-11. The Tracking Generator can be operated from a

48to 440-hertz input line that supplies either 115or 230-

volt (+10% in each case) power. Consumed power is

normally less than 15 watts.

2-12. The 115/230 power selector switch on the rear

panel line power module must be set to agree with the

available line voltage. The selector switch is located

below the fuse holder and fuse extractor lever. An

arrow on the selector switch points to callouts listing the

line input voltage and fuse amperage rating. To change

the position of the selector switch it is necessary to

remove the power cable, slide the protective cover to

the left and lift the fuse extractor before the switch can

be changed. With the fuse extractor extended, press

down and toward the desired direction. Replace fuse

with a fuse of the amperage rating for the selected

position. See Section VI for replacement HP Part

Numbers. The instrument is normally shipped with fuse

installed for 115-volt operation.

2-13. Power Cable

2-14. To protect operating personnel, the National

Electrical Manufacturers Association (NEMA) and the

International Electrotechnical Commission (IEC)

recommends that the instrument panel and cabinet be

grounded. The Tracking Generator is equipped with a

three-conductor power cable; the third conductor is the

ground conductor and when the cable is plugged into an

appropriate receptacle, the instrument is grounded. To

preserve the protection feature when operating the

instrument from a two-contact outlet, use a three-prong

to two-prong adapter and connect the green or green/

yellow lead on the adapter to ground.

2-15. Power cables are selected for shipment with each

instrument; with a line connector plug to match the

standard power cord for the country of destination on the

purchase order. A label indicating the power cable

inside is affixed to the packing case. Figure 2-1

indicates the connector plugs and the HP part numbers

for the various available power cables and plugs.

2-16. OPERATING ENVIRONMENT

2-17. The Tracking Generator does not require forced

air cooling when operating at temperatures from 0 to

55°C (32 to 131°F). When operating the instrument,

choose a location which will provide at

2-1

Model 8444A TM 11-6625-2866-14&P

Installation

least three inches of clearance around the rear and both

sides. Normal air circulation will maintain a reasonable

temperature within the instrument.

2-18. INSTALLATION CONNECTIONS

2-19. A rack mounting kit is supplied for rack

installation. Additionally, a joining bracket kit

(accessory) can be provided to secure the Tracking

Generator to the Spectrum Analyzer. Installation

instructions are supplied with both joining bracket and

rack mounting kits.

2-20. Electrical connections are provided by three

coaxial cables and two line power cords. Coaxial cables

connect Spectrum Analyzer FIRST LO OUTPUT to

Tracking Generator FIRST LO INPUT, THIRD LO

OUTPUT to THIRD LO INPUT and SCAN OUTPUT to

SCAN IN/OUT. Double shielded coaxial cables are

provided for connection between local oscillator input

and output connectors. Refer to Table 1-2 for

description and HP part number of cables supplied with

the Tracking Generator.

2-21. STORAGE AND SHIPMENT

2-22. Original Packaging

2-23. The same containers and materials used in

factory packaging can be obtained through the Hewlett-

Packard Sales and Service offices listed at the rear of

this manual.

2-24. If the instrument is being returned to Hewlett-

Packard for servicing, attach a tag indicating service

required, return address, instrument model number and

full serial number. Mark the container FRAGILE to

assure careful handling.

2-25. In any correspondence refer to the instrument by

model number and full serial number.

2-26. Other Packaging Materials

2-27. The following general instructions should be

followed when repackaging with commercially available

materials:

a. Wrap the instrument in heavy paper or plastic.

(If shipping to a Hewlett-Packard Service office or

center attach a tag indicating the type of service

required, return address, model number and full serial

number.)

b. Use a strong shipping container. A double-wall

carton made of 350 pound test material is adequate.

c. Use enough shock-absorbing material (three to

four inch layer) around all sides of the instrument to

provide firm cushion and prevent movement inside the

container. Protect the control panel with cardboard.

d. Seal the shipping container securely.

e. Mark the shipping container FRAGILE to assure

careful handling.

Figure 2-1. Power Cable Line Connector Labels

2-2

Model 8444A TM 11-6625-2866-14&P

Operation

SECTION III

OPERATION

3-1. INTRODUCTION

3-2. This section provides complete operation

instructions for the HP Model 8444A Tracking

Generator. Front and rear panel controls, connectors

and indicators for the Tracking Generator are identified

and described in Figures 3-1 and 3-2. Operational

connections and adjustments for the Tracking Generator

and an 8554B Spectrum Analyzer System are detailed

in Figure 3-3. Operational connections and adjustments

for the Tracking Generator and an 8555A Spectrum

Analyzer System are detailed in Figure 3-4. Additional

operating information is contained in Figures 3-5

through 3-10.

3-3. PANEL FEATURES

3-4. Front and rear panel features of the Tracking

Generator are described in Figures 3-1 and 3-2. Front

and rear panel views of the Tracking Generator

connected to the HP 8554B/8552/141T Spectrum

Analyzer are shown in Figure 3-3. Front and rear panel

views of the Tracking Generator connected to the HP

8555A/8552/141T Spectrum Analyzer are shown in

Figure 3-4. For a detailed description of the Spectrum

Analyzer controls, connectors and indicators refer to the

appropriate operating and service manuals for those

instruments. Interconnection wiring between the

Tracking Generator and the Spectrum Analyzer is

contained in Section VIII (Service Sheet 1) of this

manual.

3-5. OPERATOR'S CHECKS

3-6. Upon receipt of the instrument, or when the

Tracking Generator is to be used with a different

Spectrum Analyzer, perform the operational adjustment

procedures listed in Figure 3-3 or 3-4.

3-7. OPERATING INSTRUCTIONS

3-8. General operating instructions are contained in

Figures 3-3 and 3-4. These instructions will familiarize

the operator with basic operating functions of the

Tracking Generator in use with Spectrum Analyzers.

Additional operating techniques and information is

contained in Figures 3-5 through 3-10.

3-9. CONTROLS, INDICATORS AND CONNECTORS

3-10. Front and rear panel controls, indicators and

connectors are identified and briefly described in

Figures 3-1 and 3-2. Operational adjustment

procedures are given in Figures 3-3 and 3-4. Additional

information, to assist the user during instrument

operation, is given in the following paragraphs.

3-11. OPERATING TECHNIQUES

3-12. The following information is provided to acquaint

the user with Tracking Generator/ SpectrumAnalyzer

operation. When a device is placed in the signal path

between the Tracking Generator and the Spectrum

Analyzer, the analyzer detects and displays the

frequency response of the device under test. The

Spectrum Analyzer tuning and scan width settings

determine the Tracking Generator output frequency and

the resultant CRT display. The type of device, control

settings, and typical display is provided for each of the

following measurements.

a. Crystal Filter Measurement, Para. 3-13.

b. Bandpass Filter Measurement, Para. 3-15.

c. Low-Pass Filter Measurement, Para. 3-17.

d. Swept Return Loss Measurement, , Para. 3-19.

e. Amplifier Gain and Bandwidth Measurement,

Para. 3-21.

f. Precision Frequency Measurement, Para. 3-23.

3-1

Model 8444A TM 11-6625-2866-14&P

Operation

FRONT PANEL

1. LINE - ON/OFF. Controls primary power to Tracking

Generator. Light glows when switch is energized.

Type A1H bulb. For access to bulb, switch to OFF

and pull button straight out.

2. MANUAL SCAN. Provides manual tuning of

Spectrum Analyzer. Controls voltage level at SCAN

OUTPUT (8) below. Scan trace on CRT determined

by position of MANUAL SCAN control. For MANUAL

SCAN operation, connect cable between Tracking

Generator SCAN OUTPUT and Spectrum Analyzer

SCAN IN/OUT. Set Spectrum Analyzer SCAN

MODE switch to EXT. Vary MANUAL SCAN control

to tune analyzer through selected SCAN WIDTH.

3. TRACK ADJ. Adjusts frequency of 1.55 GHz

oscillator in Tracking Generator so that the RF

OUTPUT (5) tracks the frequency tuning of the

Spectrum Analyzer. Control adjusted for maximum

amplitude indication of trace on CRT display. Ten

turn control provides adjustment of frequency over a

range of approximately 4 MHz.

4. LEVEL. Adjusts Tracking Generator RF OUTPUT

(5) level over range of 0 to -10 dBm. Level

calibrated

for 0 dBm at 30 MHz with accuracy of +0.5 dB. Set

LEVEL control to 0 dBm for calibrated CRT display

on Spectrum Analyzer.

5. RF OUTPUT. Type N Connector - Tracking

Generator RF output connector. Frequency adjusted

to track tuning of Spectrum Analyzer by TRACK ADJ

(3). Output level adjusted by LEVEL (4).

6. THIRD LO INPUT. Type BNC connector Input for

Spectrum Analyzer third LO (500 MHz). Normally

used with 8554B RF Section. Parallel with rear panel

THIRD LO INPUT which is normally used with 8555A

RF Section.

7. FIRST LO INPUT. Type BNC connector-Input for

Spectrum Analyzer first LO (2.05 - 3.3 GHz with

8554L RF Section) - (2.05 - 4.1 GHz with 8555A RF

Section).

8. SCAN OUTPUT. Type BNC connector. Manual

tune voltage to Spectrum Analyzer (0 to 10 Vdc).

Voltage level controlled by position of MANUAL

SCAN (2).

Figure 3-1. Model 8444A Tracking Generator Front Panel Controls, Indicators and Connectors

3-2

Model 8444A TM 11-6625-2866-14&P

Operation

REAR PANEL

1. AUX RF OUTPUT. Type BNC connector Tracking

Generator auxiliary RF output. Same frequency as

signal out front panel RF OUTPUT connector. For

use with external frequency counter during precision

frequency measurements. Terminate in 50 ohms.

2. THIRD LO INPUT. Type BNC connector Input for

Spectrum Analyzer third LO (500 MHz). Normally

used with 8555A RF Section. Parallel with front

panel THIRD LO INPUT which is normally used with

8554B RF Section.

3. ACCESSORY OUTLET. Line power outlet.

Connected to power line module input. Provides ac

outlet for use by accessory equipment.

Note

See Table 14 for HP part numbers of

interconnecting power cords.

4. Line power module. 115/230V, 48-440 Hz.

5. Line input. Connects to external ac power source.

Supplies ac power to ACCESSORY OUTLET when

connected to external power source.

6. 115/230V Switch. Line voltage slide switch; controls

power supply input connections. Check that switch is

set for nominal voltage of ac line. To change setting:

remove power cord from line input (5) , slide

protective cover aside, extract fuse with FUSE PULL

(7) and slide switch to desired position. Replace fuse

with a fuse of the value indicated for the desired

switch position.

7. Fuse extractor and switch lock. Prevents line switch

from being actuated until fuse is extracted.

8. Line input fuse. Rating of fuse to be used is marked

near line voltage slide switch setting corresponding to

nominal ac supply voltage.

Figure 3-2. Model 8444A Tracking Generator Rear Panel Controls and Connectors

3-3

Model 8444A TM 11-6625-2866-14&P

Operation

Figure 3-3. Tracking Generator Operation with 8554B Spectrum Analyzer (1 of 2)-,

3-4

Model 8444A TM 11-6625-2866- 14&P

Operation

OPERATING PROCEDURE

WITH AN 8554B

1. Check that the 115/230V switch is set to correspond

with the available line voltage. Refer to Figure 3-2,

steps 4 through 8, for switch and fuse information.

2. Apply power to Tracking Generator and Spectrum

Analyzer.

3. Turn Spectrum Analyzer INTENSITY control fully

CCW.

4. Allow instruments to warm up for at least 30 minutes.

5. Perform Spectrum Analyzer "Calibration Procedure".

Refer to 8554B RF Section Operating Manual.

6. Set Spectrum Analyzer LOG/LINEAR control to

LOG, LOG REF LEVEL to 0 dBm, and

BANDWIDTH to 300 kHz.

7. Make the following interconnections between

Tracking Generator and Spectrum Analyzer:

a. FIRST LO INPUT to FIRST LO OUTPUT.

b. THIRD LO INPUT to THIRD LO OUTPUT.

c. RF OUTPUT to RF INPUT.

d. SCAN OUTPUT to SCAN IN/OUT.

8. Check that the Spectrum Analyzer controls are set as

follows:

INTENSITY ..................................12 o'clock (approx.)

FREQUENCY .............................................. 30 MHz

BANDWIDTH ................................................ 300 kHz

SCAN WIDTH PER DIVISION ...................... 50 kHz

INPUT ATTENUATION ................................... 10 dB

TUNING STABILIZER .......................................... On

BASE LINE CLIPPER ..................................... CCW

SCAN TIME PER DIVISION ........ 5 MILLISECONDS

LOG/LINEAR ................................................... LOG

LOG REF LEVEL ............................................ O dBm

LOG REF LEVEL Vernier ......................................... 0

VIDEO FILTER .................................................. OFF

SCAN MODE ....................................................... INT

SCAN TRIGGER ............................................. LINE

9. Set Tracking Generator LEVEL control to 0 dBm and

adjust TRACK ADJ for maximum signal amplitude

indication on CRT display.

10. Adjust Spectrum Analyzer Vernier control or

Tracking Generator LEVEL control to position signal

on CRT LOG REF level graticule line. (System

calibrated at 30 MHz with an amplitude accuracy of

+/- 0.5 dB.)

11. Set Spectrum Analyzer to scan desired frequency

range. (FREQUENCY control adjusted to center of

frequency of interest, SCAN WIDTH set for desired

coverage.)

12. Insert device to be tested between Tracking

Generator RF OUTPUT and Spectrum Analyzer RF

INPUT.

13. Rotate Tracking Generator MANUAL SCAN control

fully counterclockwise.

14. Set Spectrum Analyzer SCAN MODE switch to

EXT.

15. Rotate Tracking Generator MANUAL SCAN control

clockwise to tune system through selected

frequency range.

16. For automatic scanning, set SCAN MODE switch to

INT and SCAN TIME PER DIVISION to desired

scan time.

Figure 3-3. Tracking Generator Operation with 8554B Spectrum Analyzer (2 of 2)

3-5

Model 8444A TM 11-6625-2866-14&P

Operation

Figure 3-4. Tracking Generator Operation with 8555A Spectrum Analyzer (1 of 2)

3-6

Model 8444A TM 11-6625-2866-14&P

Operation

OPERATING PROCEDURE

WITH AN 8555A

1. Check that the 115/230 switch is set to correspond

with the available line voltage. Refer to Figure 3-2,

steps 4 through 8, for switch and fuse information.

2. Apply power to Tracking Generator and Spectrum

Analyzer.

3. Turn Spectrum Analyzer INTENSITY control fully

CCW.

4. Allow instruments to warm up for at least 30 minutes.

5. Perform Spectrum Analyzer Operational Adjustments

(30 MHz Calibration). Refer to 8555A RF Section

Operating and Service Manual.

6. Set Spectrum Analyzer LOG/LINEAR control to

LOG, LOG REF LEVEL to 0 dBm, and

BANDWIDTH to 300 kHz.

7. Make the following interconnections between

Tracking Generator and Spectrum Analyzer:

a. FIRST LO INPUT to FIRST LO OUTPUT.

b. THIRD LO INPUT to THIRD LO OUTPUT (rear

panel connections).

c. RF OUTPUT to INPUT.

d. SCAN OUTPUT to SCAN IN/OUT.

8. Check that the Spectrum Analyzer controls are set as

follows:

INTENSITY ................................ 12 o'clock (approx.)

BAND ............................................n=l- (2.05 GHz IF)

FREQUENCY .............................................. 30 MHz

BANDWIDTH .............................................. 300 kHz

SCAN WIDTH PER DIVISION .................... 100 kHz

INPUT ATTENUATION ..................................... 20 dB

TUNING STABILIZER ..........................................ON

SIGNAL IDENTIFIER ........................................ OFF

BASE LINE CLIPPER ..................................... CCW

SCAN TIME PER DIVISION ...... 10 MILLISECONDS

LOG/LINEAR ................................................... LOG

LOG REF LEVEL ......................................... O dBm

LOG REF LEVEL Vernier ......................................... 0

VIDEO FILTER ................................................... OFF

SCAN MODE ..................................................... INT

SCAN TRIGGER ............................... LINE or AUTO

9. Set Tracking Generator LEVEL control to 0 dBm and

adjust TRACK ADJ for maximum signal amplitude

indication on CRT display.

10. Adjust Spectrum Analyzer Vernier control or

Tracking Generator LEVEL control to position signal

on CRT LOG REF level graticule line. (System

calibrated at 30 MHz with an amplitude accuracy of

10.5 dB.)

11. Set Spectrum Analyzer to scan desired frequency

range. (FREQUENCY control adjusted to center of

frequency of interest, SCAN WIDTH set for desired

coverage.)

12. Insert device to be tested between Tracking

Generator RF OUTPUT and Spectrum Analyzer RF

INPUT.

13. Rotate Tracking Generator MANUAL SCAN control

fully counterclockwise.

14. Set Spectrum Analyzer SCAN MODE switch to

EXT.

15. Rotate Tracking Generator MANUAL SCAN control

clockwise to tune system through selected

frequency range.

16. For automatic scanning, set SCAN MODE switch to

INT and SCAN TIME PER DIVISION to desired

scan time.

Figure 3-4. Tracking Generator Operation with 8555A Spectrum Analyzer (2 of 2)

3-7

Model 8444A TM 11-6625-2866 -14&P

Operation

3-13. Crystal Filter Measurement

3-14. Figure 3-5 illustrates the CRT display for a 20

MHz crystal filter. Filter characteristics: 2-kHz passband

with bandwidth at the 60-dB points less than 10 kHz.

a. Spectrum Analyzer (8555A) control settings:

FREQUENCY.................................................20 MHz

BANDWIDTH.....................................................3 kHz

SCAN WIDTH PER DIVISION ..........................5 kHz

INPUT ATTENUATION .................................. 10 dB

SCAN TIME PER DIVISION ......20 MILLISECONDS

LOG REF LEVEL .............................................OdBm

VIDEO FILTER ............................................. 100 Hz

SCAN MODE ........................................................INT

SCAN TRIGGER ............................................ AUTO

LOG/LINEAR .................................................... LOG

b. Tracking Generator control settings:

TRACK ADJ .......................................................Peak

LEVEL ........................................................... OdBm

Figure 3-5. 20 MHz Crystal Filter CRT Display

3-15. Bandpass Filter Measurement

3-16. Figure 3-6 illustrates the CRT display for a

50 MHz bandpass filter. Filter characteristics: 50

MHz, 4-pole bandpass filter; adjusted for band-

width of approximately 5 MHz at the 3 dB points.

Bandwidth at 60 dB points is approximately 32

MHz.

a. Spectrum Analyzer (8555A) control settings:

FREQUENCY....................................................50 MHz

BANDWIDTH......................................................10 kHz

SCAN WIDTH PER DIVISION ............................5 MHz

INPUT ATTENUATION .......................................10 dB

SCAN TIME PER DIVISION ...................0.5 SECONDS

LOG REF LEVEL ................................................0 dBm

VIDEO FILTER ....................................................10 Hz

SCAN MODE ...........................................................INT

SCAN TRIGGER ..................................................AUTO

LOG/LINEAR .........................................................LOG

b. Tracking Generator control settings:

TRACK ADJ ..........................................................Peak

LEVEL ...............................................................O dBm

Figure 3-6. 50 MHz Bandpass Filter CRT Display

3-17. Low-Pass Filter Measurement

3-18. Figure 3-7 illustrates the CRT display for a 23

MHz low-pass filter. Filter characteristics: 3 dB point at

approximately 23 MHz, 60 dB point at approximately 42

MHz.

a. Spectrum Analyzer (8555A) control settings:

FREQUENCY ..................................................25 MHz

SCAN WIDTH PER DIVISION ............................5 MHz

BANDWIDTH ...................................................100 kHz

INPUT ATTENUATION ........................................10 dB

SCAN TIME PER DIVISION ...................0.1 SECONDS

LOG/LINEAR .........................................................LOG

LOG REF LEVEL .........................................(+) 10 dBm

LOG REF LEVEL Vernier ......................................-3 dB

VIDEO FILTER ....................................................10 Hz

SCAN MODE ...........................................................INT

SCAN TRIGGER ..................................................AUTO

b. Tracking Generator control settings:

TRACK ADJ ..........................................................Peak

LEVEL ................................................................OdBm

3-8

Model 8444A TM 11-6625-2866-14&P

Operation

Figure 3-7. 23 MHz Low-Pass Filter CRT Display

3-19. Swept Return Loss Measurement

3-20. Figure 3-8 illustrates the CRT display for a wept

return loss or reflection coefficient measurement. A

directional bridge (HP 8721A) was used to separate the

incident from the reflected signal. The filter under test is

the same 23-MHz Low-Pass (paragraph 3-18). Control

settings same as paragraph 3-18 except analyzer gain

adjusted so that the top graticule line represents 0 dB

return loss or total reflection (e.g. a short or open

circuit). Return loss is greater than 15 dB (p0.18, SWR

1.44) over the filter range of 0 to 23 MHz.

Figure 3-8. Swept Return Loss Measurement

CR T Display

3-21. Amplifier Gain and Bandwidth Measurement

3-22. Figure 3-9 illustrates the CRT display for a .1 to

400 MHz amplifier with gain of approximately 19 dB. A

reference level is first established by connecting the

Tracking Generator output to the Spectrum Analyzer

(through a 30 dB attenuator) and scanning over the

range of interest. The amplifier is then connected

between the Tracking Generator and the Spectrum

Analyzer and the same

frequency range scanned. The Spectrum Analyzer

(8554B) set to full scan (0-1250) provides a CRT display

indication as follows: 3-dB bandwidth approximately 500

MHz (level at +1 graticule line) and zero gain point of

approximately 1025 MHz.

a. 30 dB Coaxial Attenuator installed at Tracking

Generator RF OUTPUT.

b. Spectrum Analyzer(8554B) control settings:

BANDWIDTH.....................................................300 kHz

SCAN WIDTH............................................0--1250 MHz

INPUT ATTENUATION .......................................10 dB

SCAN TIME PER DIVISION 10 MILLISECONDS

LOG/LINEAR .........................................................LOG

LOG REF LEVEL ............................................+10 dBm

VIDEO FILTER ......................................................OFF

SCAN MODE ...........................................................INT

SCAN TRIGGER ..................................................AUTO

c. Tracking Generator control settings:

TRACK ADJ...........................................................Peak

LEVEL ................................................................0 dBm

Figure 3-9. Amplifier Gain and Bandwidth

CRT Display

3-23. Precision Frequency Measurements

3-24. An external frequency counter may be used with

the Tracking Generator/Spectrum Analyzer System for

frequency measurements at any point on the CRT

display. With the counter connected to the Tracking

Generator AUX RF OUTPUT jack (rear panel) and the

system operated in the MANUAL SCAN mode; the scan

can be stopped at any point for frequency

measurement.

CAUTION

Do not leave System stopped in MANUAL SCAN

with high INTENSITY. Damage to the display

CRT can result.

3-9

Model 8444A TM 11-6625-2866-14&P

Operation

Figure 3-10 illustrates frequency measurement at the 30

dB point on a low-pass filter.

a. Spectrum Analyzer (8554B) control settings:

FREQUENCY ................................................... 50 MHz

BANDWIDTH ....................................................300 kHz

SCAN WIDTH PER DIVISION .......................... 10 MHz

INPUT ATTENUATION ......................................... 10dB

SCAN TIME PER DIVISION ........... 10 MILLISECONDS

LOG REF LEVEL ................................................ 0 dBm

LOG/LINEAR .........................................................LOG

VIDEO FILTER ...................................................... OFF

SCAN MODE ...........................................................INT

SCAN TRIGGER ..................................................AUTO

b. Tracking Generator control settings:

TRACK ADJ .......................................................... Peak

LEVEL ................................................................ 0 dBm

MANUAL SCAN ....................................................CCW

c. Connect unit under test between Tracking

Generator RF OUTPUT and Spectrum Analyzer

RF INPUT.

d. Connect Tracking Generator AUX RF OUTPUT

to Frequency Counter input.

e. Connect. Tracking Generator SCAN OUTPUT to

Spectrum Analyzer SCAN IN/OUT.

f. Connect Tracking Generator FIRST LO INPUT to

Spectrum Analyzer FIRST LO OUTPUT and THIRD LO

INPUT to THIRD LO OUTPUT.

g. Note point of interest on CRT display.

h. Set Spectrum Analyzer SCAN MODE to EXT

and rotate Tracking Generator MANUAL SCAN control

clockwise to point of interest.

i. Note and record frequency.

j. Set Spectrum Analyzer SCAN MODE to INT.

Note

The CRT trace (dot) can be moved in either

direction by the Tracking Generator MANUAL

SCAN control. For best' frequency accuracy,

approach frequency measurement point while

tuning the MANUAL SCAN control in the

clockwise

direction.

Figure 3-10. Precision Frequency Measurement CRT

Display

3-10

Model 8444A TM 11-6625-2866-14&P

Performance Tests

SECTION IV

PERFORMANCE TESTS

4-1. INTRODUCTION

4-2. This section contains preset adjustment procedures

and performance tests for the Model 8444A Tracking

Generator and Model 8554L or 8555A/ 8552B/141T

Spectrum Analyzer System. Preset adjustments for the

8444A/8554B/8552B/141T system are given in

paragraph 4-7. Preset adjustments for the

8444A/8555A/8552B/141T are given in paragraph 4-9.

Perform the preset adjustment procedures for the

appropriate system prior to accomplishing the

performance tests. Procedures for verifying that the

instruments meet specifications are given in paragraphs

4-16 through 4-20.

4-3. EQUIPMENT REQUIRED

4-4. Test equipment and accessories for performance

(P), adjustment (A) and troubleshooting (T) are listed in

Table 1-3. Critical specifications and/ or required

features for the test equipment and accessories are

contained in the table. Each performance test lists the

required test equipment and contains an illustrated test

equipment setup.

4-5. FRONT PANEL CHECKS

4-6. Before proceeding to the performance tests, the

instruments must be adjusted and all controls set as

specified in the preset adjustment procedures for the

appropriate system (8554B/8555A). The instruments

should perform as called out in the preset adjustment

procedures before going on to the performance tests.

4-7. Preset Adjustments (8554B/8552B/141T/ 8444A

System)

4-8. Procedure:

a. Apply power to Tracking Generator and

Spectrum Analyzer.

b. Turn Spectrum Analyzer INTENSITY control fully

CCW.

c. Allow instruments to warm up for at least 30

minutes.

d. Perform Spectrum Analyzer 30 MHz calibration

procedure. Refer to 8554B RF Section Operating

Manual.

e. Connect Spectrum Analyzer FIRST LO OUTPUT

to Tracking Generator FIRST LO

INPUT.

f. Connect Spectrum Analyzer THIRD LO OUTPUT

to Tracking Generator THIRD LO INPUT.

g. Connect Tracking Generator RF OUTPUT to

Spectrum Analyzer RF INPUT.

h. Connect Tracking Generator SCAN OUTPUT to

Spectrum Analyzer SCAN IN/OUT.

i. Set Spectrum Analyzer controls as follows:

INTENSITY .....................................12 o'clock (approx.)

FREQUENCY ................................................... 30 MHz

BANDWIDTH ....................................................300 kHz

SCAN WIDTH ........................................PER DIVISION

SCAN WIDTH PER DIVISION ...........................200 kHz

INPUT ATTENUATION ........................................ 20 dB

TUNING STABILIZER ...............................................On

BASE LINE CLIPPER ...........................................CCW

SCAN TIME PER DIVISION ........... 10 MILLISECONDS

LOG/LINEAR ...............................................10 dB LOG

LOG REF LEVEL ................................................ OdBm

LOG REF LEVEL Vernier ............................................ 0

VIDEO FILTER ...................................................... OFF

SCAN MODE ...........................................................INT

SCAN TRIGGER .....................................LINE or AUTO

j. Set Tracking Generator controls as follows:

MANUALSCAN ....................................................CCW

LEVEL ................................................................ OdBm

k. Adjust TRACK ADJ control for maximum

amplitude of trace on CRT display.

l. If trace is not within +0.5 dB of LOG REF level

graticule line repeat Spectrum Analyzer calibration

procedure.

m. Reconnect Tracking Generator RF OUTPUT to

Spectrum Analyzer RF INPUT and adjust TRACK ADJ

for maximum signal amplitude.

n. Rotate LEVEL control fully counterclockwise (-10

dBm) and note signal level on CRT display.

-10 to --12 dBm

4-1

Model 8444A TM 11-6625-2866-14&P

Performance Tests

o. If the signal level is off more than ±0.5 dB at the 0

dBm point or not within -10 to -12 dBm with the I, L, VEL

control fully counterclockwise, refer to paragraph 4-16,

Output Level Performance Check, a:1 -13 for LEVEL

control calibration procedure.

4-9. Preset Adjustments (8555A/8552B/141T/ 8444A

System)

4-10. Procedure:

a. Apply power to Tracking Generator and

Spectrum Analyzer.

b. Turn Spectrum Analyzer INTENSITY , control

fully CCW.

c. Allow instruments to warm up for at least 30

minutes.

d. Per, form Spectrum Analyzer Operational

Adjustments (30 MHz Calibration). Refer to o55t5 A

RF' Section Operating and Service Manual.

e. Connect Spectrum Analyzer FIRST LO

OUTPUT'l1, -. Tracking Generator FIRST LO INPUIT.

f. Connect Spectrum Analyzer THIRD LO OUTPUT

to Tracking Generator THIRD LO INPUT (rear panel

connections).

g. Connect Tracking Generator RF OUTPUT to

Spectrum .Analyzer INPUT.

h. Connect '[racking Generator SCAN OUTPUT to

PUT to Spectrum Analyzer SCAN IN/OUT.

i. Set Spectrum Analyzer controls as follows:

INTENSIT' ......................................12 o'clock (approx.)

BAND.................................................n=1-(2.05 GHz IF)

FREQUENCY ................................................... 30 MHz

BANDWIDTH ...................................................300 kHz

SCAN WIDTH ........................................PER DIVISION

SCAN WIDTH PER DIVISION .........................100 kHz

INPUT ATTENUATION ........................................ 20dB

TUNING STABILIZER .............................................. ON

SIGNAL IDIENTIFIER ............................................ OFF

BASE LINE CLIPPER ...........................................CCW

SCAN TIME PER DIVISION .......... 10 MILLISECONDS

LOG /LlNEAR ..............................................10 dB LOG

LOG REF LEVEL ................................................ 0 dBm

LOG REF LEVEL Vernier ............................................ 0

VIDEO FILTER ...................................................... OFF

SCAN MODE ............................................................INT

SCAN TRIGGER ....................................LINE or AUTO

j. Set Tracking Generator controls as follows:

MANUAL SCAN CCW

LEVEL ...................................................................dBm

k. Adjust TRACK ADJ control for maximum

aptitude of trace on CRT display.

l. If trace is not within +0.5 dB of LOG REF level

graticule line repeat Spectrum Analyzer calibration

procedure.

m. Reconnect Tracking Generator RF OUTPUT to

Spectrum Analyzer INPUT and adjust TRACK ADJ for

maximum signal amplitude.

n. Rotate LEVEL control fully counterclockwise (-10

dBm) and note signal level on CRT display.

-10 to -12 dBm

o. If the signal level is off more than +0.5 dB at the

0 dBm point or not within -10 to -12 dBm with the

LEVEL control fully counterclockwise, refer to paragraph

4-16, Output Level Performance Check, and 5-13 for

LEVEL control calibration procedure.

4-11. PERFORMANCE TESTS

4-12. The performance tests, given in this section, are

suitable for incoming inspection, troubleshooting, and/or

preventive maintenance. During any performance test,

all shields and connecting hardware must be in place.

The tests are designed to verify published

specifications. Perform the tests in the order given, and

record data on test card (Table 4-1) and/or in the data

spaces provided in each test.

4-13. The tests are arranged in the following order:

Paragraph Test Description

4-16 Output Level and flatness

4-17 Frequency Stability

4-18 System Flatness

4-19. Frequency Accuracy

4-20 Distortion

4-14. Each test is arranged so that the specification is

written as it appears in the Table of Specifications

(Table 1-1) in Section I. Next, a description of the test

and any special instructions or problem areas are

included. Each test that requires test equipment has a

test setup drawing and a list of required equipment.

Each procedure gives control settings required for that

particular test.

4-2

TM 11-6625-2866-14&P

Model 8444A Performance Tests

4-15. Required minimum specifications for test

specifications listed in order to performance-test

equipment are detailed in Table 1-3 in Section I. If the

Tracking Generator. substitute test equipment is used, it

must meet the

PERFORMANCE TESTS

4-16. Output Level

SPECIFICATION: Tracking Generator (Drive Level to Test Device): 0 to -10 dBm continuously variable.

0 dBm calibrated to +0.5 dB. Flatness: +0.5 dB.

DESCRIPTION: With the Tracking Generator connected to the Spectrum Analyzer, the Tracking Generator output level

is first checked at 30 MHz (Spectrum Analyzer amplitude calibration point) with a power meter. With Tracking Generator

LEVEL control set at 0 dBm, the power meter indication should be 0 dBm +0.5 dB. With LEVEL control set fully

counterclockwise, the power meter indication should be -10 dBm to -12 dBm.

The flatness of the Tracking Generator output is checked using a power meter from 10 MHz to 1.3 GHz if used with the

8555A, and 500 kHz to 1.25 GHz if used with the 8554B. The overall maximum power variation in each case must not

exceed I dB (+0.5 dB).

Figure 4-1. Output Level and Flatness Test Setup

EQUIPMENT:

Spectrum Analyzer .................................................................................... HP 8554B or 8555A/8552B/141T

Power Meter .............................................................................................. HP 435A

Power Sensor ............................................................................................ HP 8482A

Frequency Counter .................................................................................... HP 5340A

Adapter, Type N Male to BNC Female ...................................................... HP 1250-0780

Interconnect Cable (8555A THIRD LO) ..................................................... HP 08444-60017

Interconnect Cable (two required) .............................................................. HP 08444-60018

Cable Assembly (RF) ................................................................................ HP 08441-6012

4-3

TM 11-6625-2866-14&P

Model 8444A

PERFORMANCE TESTS

4-16. OUTPUT LEVEL AND FLATNESS (Cont'd)

PROCEDURE:

1. Perform preset adjustment procedures, paragraph 4-7 for 8554B/8552B/141T Spectrum Analyzer System or

paragraph 4-9 for 8555A/8552B/141T Spectrum Analyzer System.

2. Connect test setup as shown in Figure 4-1 and set controls as follows:

Power Meter

RANGE .................................................................................... O dBm

LINE .......................................................................................... ON

CAL FACTOR ............................................................................ See Power Sensor

Frequency Counter

RANGE ..................................................................................... 10 Hz-18 GHz

LINE .......................................................................................... ON

RESOLUTION Hz ...................................................................... 100

Tracking Generator

MANUAL SCAN ......................................................................... Fully Counterclockwise

LEVEL........................................................................................ O dBm

3. Set Spectrum Analyzer TUNING STABILIZER to OFF and set SCAN WIDTH to ZERO. Adjust FREQUENCY for

indication of 30 MHz ± 100 kHz on Frequency Counter.

4. Tune Tracking Generator TRACK ADJ for maximum signal amplitude on Spectrum Analyzer.

5. Connect Power Sensor to 435A POWER REF OUTPUT and ZERO Power Meter. Set rear-panel POWER REF

switch to ON (up). Set CAL ADJ for proper 435A indication. Remove Power Sensor and return POWER REF

switch to OFF.

6. Disconnect cable at Tracking Generator RF OUTPUT and connect Power Sensor to RF OUTPUT connector.

Disconnect FIRST LO cable and ZERO Power Meter. Reconnect FIRST LO cable. Measure and record power

level. MAX. ACTUAL MIN.

+0.5 dBm ___dBm ____-0.5 dBm

7. Set Tracking Generator LEVEL control fully counterclockwise. Measure and record power level.

MAX. ACTUAL MIN.

-10dBm ___dBm ____-12 dBm

8. Adjust Tracking Generator LEVEL control to set a -I dBm reference level on power meter.

9. With Spectrum Analyzer FREQUENCY control, slowly tune the Spectrum Analyzer and Tracking Generator

between 10 MHz and 1.3 GHz if using 8555A RF Section, or between 500 kHz and 1.25 GHz if using 85S4B RF

Section.

10. Note and record the maximum overall power deviation. MAX. ACTUAL

1 dB

(±0.5 dB) ____dB

4-4

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

This space intentionally left blank.

4-17. Frequency Stability

SPECIFICATION: Stability: Residual FM (peak-to-peak):

Tuning Section Stabilized Unstablized

8554B/8555A 200 Hz 10 kHz

DESCRIPTION: The stability of the Spectrum Analyzer/Tracking Generator System is checked using a HP

141T/8553B/8552B Spectrum Analyzer System which has less than 20 Hz peak-to-peak residual FM. The Spectrum

Analyzer in the system must be within residual FM specification limits. Refer to appropriate RF Section Operating and

Service Manual. There are no adjustments in the Tracking Generator for residual FM.

Refer to paragraph 5-10 if residual FM is excessive.

4-5/4-6

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-17. Frequency Stability (cont'd)

Figure 4-2. Residual FM Test Setup

EQUIPMENT:

Spectrum Analyzer ................................................................... .................HP 8554B or 8555A/8552B/141T

Test Spectrum Analyzer . ......................................................... .................HP 8553B/8552B/141T

BNC Cable ................................................................................ .................HP 10503A

PROCEDURE:

1. Perform preset adjustment procedures, paragraph 4-7, for 8554B/8552B/141T Spectrum Analyzer System or

paragraph 4-9 for 8555A/8552B/141T Spectrum Analyzer System.

2. Connect test setup as indicated in Figure 4-2 and make the following control settings:

SPECTRUM ANALYZER (Tracking Generator/Spectrum Analyzer System) See paragraph

4-7 or 4-9.

SPECTRUM ANALYZER (8553B/8552B/141T "Test Analyzer")

POWER ................................................................................................. ON

RANGE MHz .......................................................................................... 0-110

FREQUENCY. ........................................................................................ 50 MHz

BANDWIDTH.......................................................................................... 30 kHz

SCAN WIDTH......................................................................................... PER DIVISION

SCAN WIDTH PER DIVISION ................................................................ 1 MHz

NPUT ATTENUATION............................................................................ 10 dB,

UNING STABILIZER............................................................................... ON

CAN TIME PER DIVISION...................................................................... 20 MILLISECONDS

LOG/LINEAR .......................................................................................... 10 dB LOG

OG REF LEVEL...................................................................................... +10 dBm

IDEO FILTER.......................................................................................... 10 kHz

CAN MODE ............................................................................................ INT

CAN TRIGGER....................................................................................... AUTO

3. Set Tracking Generator/Spectrum Analyzer System FREQUENCY to 50 MHz and SCAN WIDTH to

ZERO.

4-7

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-17. Frequency Stability (cont'd)

4. Connect Tracking Generator AUX RF OUTPUT to Test Analyzer RF INPUT.

5. Adjust Test Analyzer FREQUENCY control to center signal on CRT Display.

6. Reduce Test Analyzer BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal

centered on CRT display.

7. Set Test Analyzer INPUT ATTENUATION to 30 dB, LOG/LINEAR to LINEAR, and LINEAR SENSITIVITY to

20.mV/DIV.

8. Adjust Test Analyzer LINEAR SENSITIVITY Vernier control for a full eight division display.

9. Refer to Figure 4-3. Tune Test Analyzer FINE TUNE so that the upward slope of the display intersects the

CENTER FREQUENCY graticule line one division from the top.

NOTE

The linear portion of the analyzer IF filter skirt is used to slope detect low-order residual FM.

The analyzer is stabilized, and the detected FM is displayed in the time domain.

10. Note where the slope intersects the middle horizontal

graticule line: Horizontal Displacement: ____ divisions

11. Use the horizontal displacement to calculate demodulation

sensitivity.

a. Convert the horizontal displacement (divisions) into Hertz.

Example: (2 kHz SCAN WIDTH) x (0.2

div) = 400 Hz.

Figure 4-3. Demodulation Sensitivity

Measurement

b. Calculate demodulation sensitivity by dividing the vertical displacement in divisions into the horizontal

displacement in Hz:

400 Hz

Example: = 133 Hz/div

3 divisions

12. Turn SCAN WIDTH to ZERO scan. Set FINE TUNE for a response level within the calibrated three division

range (one division from the top to the center horizontal graticule line).

13. Measure the peak-to-peak deviation, and multiply it by the demodulation sensitivity obtained in step lib above.

14. Example: 1.2 div p-p signal deviation x 133 Hz/div = 159.6 Hz Residual FM.

______________Hz peak-to-peak

4-8

TM 11-6625-2866-14&P

Model 8444A

PERFORMANCE TESTS

4-18. SYSTEM FLATNESS

SPECIFICATION:

Amplitude Accuracy: System Frequency Response: 1.50 dB.

DESCRIPTION:

The Tracking Generator output is checked with the Spectrum Analyzer using either an 8555A or an 8554B RF Section. A

convenient reference level is set in the 2 dB LOG mode. The overall power deviation is measured from 10 MHz to 1.3

GHz if 8555A RF Section is used, or 500 kHz to 1.25 GHz if 8554B RF Section is used.

Figure 4-4. System Flatness Test Setup

EQUIPMENT:

Spectrum Analyzer ..........................................................................HP 8554B or 8555A/8552B/141T

Frequency Counter ..........................................................................HP 5340A

Adapter, Type N Male to BNC Female ............................................HP 1250-0780

Interconnect Cable (8555A THIRD LO) ...........................................HP 08444-60017

Interconnect Cable (two required) ....................................................HP 08444-60018

Cable Assembly ..............................................................................HP 08441-6012

4-9

TM 11-6625-2866-14&P

Model 8444A

PERFORMANCE TESTS

4-18. SYSTEM FLATNESS (Cont'd)

PROCEDURE:

1. Perform preset adjustment procedures, paragraph 4-7 for 8554B/8552B/141T Spectrum Analyzer System or

paragraph 4-9 for 8555A/8552B/141T Spectrum Analyzer System.

2. Connect test setup as shown in Figure 44 and set controls as follows:

Frequency Counter

RANGE ...................................................................................................... 10 Hz-18 GHz

LINE............................................................................................................. ON

RESOLUTION Hz ....................................................................................... 100

Tracking Generator

MANUAL SCAN .......................................................................................... Fully Counterclockwise

LEVEL ......................................................................................................... 0 dBm

3. Set Spectrum Analyzer SCAN WIDTH to ZERO and adjust FREQUENCY for indication of 30 MHz + 100 kHz on

frequency counter.

4. Set Spectrum Analyzer LOG REF LEVEL to (+)' 10 dBm and LOG/LINEAR to 2 dB LOG.

5. Adjust Tracking Generator TRACK ADJ for maximum signal indication on CRT display.

6. Adjust Spectrum Analyzer LOG REF LEVEL vernier control to position trace on -20 LOG REF graticule line.

7. With Spectrum Analyzer FREQUENCY control, slowly tune the Spectrum Analyzer and Tracking Generator

between 10 MHz and 1.3 GHz if using 8555A RF Section, or between 500 kHz and 1.25 GHz if using 8554B RF

Section.

8. Note and record the maximum overall power deviation (one minor division on center vertical graticule line equals

0.4 dB). MAX. ACTUAL

3 dB

(±1.5 dB) ____dB

4-10

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PER FORMANCE TESTS

4-19. Frequency Accuracy

SPECIFICATION: Frequency Accuracy: +15 MHz using Spectrum Analyzer slide rule dial. Precision frequency

measurements: Frequency Accuracy: +10 kHz for unknown signals (using Tracking Generator AUX RF OUTPUT and

an external frequency counter.

DESCRIPTION: The accuracy of the slide rule dial is determined by the RF Section calibration. Refer to dial accuracy

performance test in the appropriated RF Section Operating and Service manual. For precision frequency

measurements, frequency accuracy is checked by tuning the Spectrum Analyzer and Tracking Generator to a known

frequency and measuring the Tracking Generator output with an external counter. The slide rule dial can be visually

checked for an accuracy of +15 MHz.

Figure 4-5. Frequency Accuracy Test Setup

EQUIPMENT: Spectrum Analyzer.................................................................................. HP 8554B/8555A/8552A/141T

Frequency Counter.................................................................................. HP 5340A

Test Oscillator......................................................................................... HP 652A

HF Signal Generator ............................................................................... HP 606A/B

VHF Signal Generator............................................................................. HP 608E/F

UHF Signal Generator............................................................................. HP 612A

Cable Assembly . ................................................................................. HP 10503A

PROCEDURE:

1. Perform preset adjustment procedures, paragraph 4-7, for 8554B/8552B/141T Spectrum Analyzer System or

paragraph 4-9 for 8555A/8552B/141T Spectrum Analyzer System.

2. Connect test setup as indicated in Figure 4-5 and make the following control settings: Spectrum Analyzer

See paragraph 4-7 or 4-9.

Frequency Counter

SAMPLE RATE ...................................................................................... 12 o'clock

SENSITIVITY ......................................................................................... 1 (VOLTS RMS)

TIME BASE ........................................................................................... 10 ms

FUNCTION ............................................................................................ FREQUENCY

4-11

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-19. Frequency Accuracy (cont'd)

Tracking Generator

TRACK ADJ ........................................................................................ Max signal amplitude

LEVEL ................................................................................................. O dBm

MANUAL SCAN .................................................................................. CCW

Test Oscillator FREQUENCY ...................................................................................... 500 kHz (8554B); 10 MHz

(8555A) OUTPUT ATTENUATOR .................................................................... OdBm

3. Allow instruments to warm up and stabilize for at least 2 hours.

4. Set Spectrum Analyze SCAN WIDTH PER DIVISION to 5 MHz, BANDWIDTH to 30 kHz, center FINE

TUNE control and set FREQUENCY to 0 MHz. Note

During all adjustments of FREQUENCY control approach dial setting in a clockwise direction.

5. Check displacement of LO feed thru signal from CRT CENTER FREQUENCY graticule line.

≤ 3 Div

6. Connect Test Oscillator 50o output to Frequency Counter and adjust oscillator frequency for an indication of 500

kHz (8554B) or 10 MHz (8555A).

7. Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT.

8. Connect Test Oscillator to Spectrum Analyzer INPUT and tune Spectrum Analyzer to Test Oscillator frequency.

9. Reduce Spectrum Analyzer SCAN WIDTH PER DIVISION to 5 kHz and BANDWIDTH to 1 kHz keeping signal

centered on CRT display with FREQUENCY and FINE TUNE controls.

10. Set SCAN WIDTH to ZERO and tune FINE TUNE for maximum signal amplitude.

11. Disconnect Test Oscillator from Spectrum Analyzer and connect Tracking Generator OUTPUT to Spectrum

Analyzer INPUT.

12. Adjust Tracking Generator TRACK ADJ for maximum signal amplitude on CRT display.

13. Connect Tracking Generator AUX RF OUTPUT to Frequency Counter. Measure and record frequency.

8554B 500 +10 kHz____________

8555A10MHz+10kHz____________

14. Repeat steps 6 through 13 at selected frequencies using appropriate signal generator in place of test oscillator.

4-12

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-20. Harmonic Distortion

SPECIFICATION: Harmonic Distortion: 25 dB below output level. Nonharmonic (spurious) signals: >40 dB below

output level.

DESCRIPTION: With the Tracking Generator and Spectrum Analyzer operating as a system, the RF OUTPUT from the

Tracking Generator is observed using a separate spectrum analyzer. The output signal is checked for signal level of

both harmonic and spurious signals.

Figure 4-6. Harmonic Distortion Test Setup

EQUIPMENT: Spectrum Analyzer .......................................................................HP 8554B or 8555A/8552B/141T

Test Spectrum Analyzer . .............................................................HP 8553B/8552B/141T

RF Section ....................................................................................HP 8554B or 8555A

BNC Cable ....................................................................................HP 10503A

Adapter ..........................................................................................UG-201A/U

PROCEDURE:

1. Perform preset adjustment procedures, paragraph 4-7, for 8554B/8552/141T Spectrum Analyzer System or

paragraph 4-9 for 8555A/8552/141T Spectrum Analyzer System.

2. Connect test setup as indicated in Figure 4-6 and make the following control settings:

Tracking Generator/Spectrum Analyzer System

See paragraph 4-7 or 4-9.

Spectrum Analyzer (8553B/8552B/141T "Test Analyzer")

FREQUENCY ................................................................................50 MHz

BANDWIDTH.................................................................................300 kHz

SCAN WIDTH ...............................................................................PER DIVISION

SCAN WIDTH PER DIVISION ......................................................0 MHz

INPUT ATTENUATION .................................................................20 dB

BASE LINE CLIPPER ...................................................................10 o'clock

VIDEO FILTER .............................................................................OFF

SCAN TIME PER DIVISION ..........................................................2 MILLISECONDS

LOG/LINEAR ................................................................................10 dB LOG

4-13

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-20. Harmonic Distortion (cont'd)

LOG REF LEVEL ........................................................................................ 0 dBm

LOG REF LEVEL Vernier............................................................................. 0

SCAN MODE ............................................................................................... INT

SCAN TRIGGER . ..................................................................................... LINE

Tracking Generator/Spectrum Analyzer System

Tracking Generator

TRACK ADJ ............................................................................................... Max signal level

LEVEL ......................................................................................................... 0 dBm

Spectrum Analyzer

BAND* ....................................................................................................... n=1 - (2.05 GHz IF)

FREQUENCY .............................................................................................. 50 MHz

TUNING STABILIZER ................................................................................. OFF

SIGNAL IDENTIFIER* . ............................................................................. OFF

BANDWIDTH............................................................................................... 300 kHz

SCAN WIDTH.............................................................................................. PER DIVISION

SCAN WIDTH PER DIVISION .................................................................... 10 MHz

INPUT ATTENUATION................................................................................ 20 dB

BASE LINE CLIPPER .................................................................................. 9 o'clock

SCAN TIME PER DIVISION ........................................................................ 0.5 SECONDS

LOG/LINEAR ............................................................................................. 10 dB LOG

LOG REF LEVEL Vernier ........................................................................... 0

VIDEO FILTER ........................................................................................... OFF

SCAN MODE .............................................................................................. INT

SCAN TRIGGER . ...................................................................................... LINE

*8555A RF Section only

3. Disconnect the cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT.

4. Connect cable between Tracking Generator RF OUTPUT and the INPUT of the "Test Analyzer".

5. Observe the "Test Analyzer" display for harmonic and spurious signals. A typical display is shown in Figure 4-7.

The Tracking Generator fundamental signal is shown between the -2 and -1 graticule lines. The second

harmonic is shown between the +1 and +2 lines with the third harmonic shown between the +4 and +5 lines. The

amplitude of the second harmonic is approximately 36 dB below the fundamental. The third harmonic is down

approximately 50 dB. A spurious signal with an amplitude of approximately -58 dBm is shown between the -4

and -3 graticule lines.

6. Change the Tracking Generator/Spectrum Analyzer System controls as follows:

Tracking Generator

LEVEL ......................................................................................................... -10 dBm (CCW)

Spectrum Analyzer

FREQUENCY . .......................................................................................... 250 MHz

SCAN WIDTH PER DIVISION ..................................................................... 50 MHz

SCAN TIME PER DIVISION......................................................................... 1 SECOND

7. Replace the "Test Analyzer'* RF Section with either an 8554B or 8555A RF Section.

4-14

TM 11-6625-2866-14&P

Model 8444A Performance Tests

PERFORMANCE TESTS

4-20. Harmonic Distortion (cont'd)

8. Set "Test Analyzer" controls as follows:

FREQUENCY ............................................................................................. 250 MHz

BANDWIDTH .............................................................................................. 300 kHz

SCAN WIDTH ............................................................................................. PER DIVISION

SCAN WIDTH PER DIVISION ................................................................... 50 MHz

INPUT ATTENUATION ............................................................................... 20 dB

BASE LINE CLIPPER ................................................................................. 12 o'clock

VIDEO FILTER ........................................................................................... OFF

SCAN TIME PER DIVISION......................................................................... 10 MILLISECONDS

LOG/LINEAR ............................................................................................... 10 dB LOG

LOG REF LEVEL ........................................................................................ 10 dBm

LOG REF LEVEL Vernier ............................................................................ 0

SCAN MODE ............................................................................................. INT

SCAN TRIGGER . ..................................................................................... LINE

9. Observe the "Test Analyzer" display for harmonic and spurious signals.

10. Figure 4-8 illustrates a typical display of the LO feedthru, fundamental and second harmonic signals.

11. Repeat the above procedure at frequency of interest.

12. Note and record maximum amplitude level of harmonic and spurious signals.

Harmonics ≤ -25 dBm

Spurious ≤ - 40 dBm

Figure 4-7. Typical Harmonic Distortion Figure 4-8. Typical Harmonic Distortion

CRT Display 0 to 1 00 MHz CRT Display 0 to 500 MHz

4-15

TM 11-6625-2866-14&P

Model 8444A Performance Tests

Table 4-1. Performance Test Record

4-16

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Model 8444A Adjustments

SECTION V

ADJUSTMENTS

5-1. INTRODUCTION

5-2. This section describes adjustments required to

return the Tracking Generator to peak operating

condition after repairs are made. Included in this

section are test setups, and check and adjustment

procedures. A test card for recording data is included at

the back of this section. Adjustment and test point

location illustrations are contained in Figures 8-4 and 8-

5-3. The adjustment procedures are arranged in

numerical order. For best results, this order should be

followed. Record data, taken during adjustments, in the

spaces provided and/or in the data test card at the end

of this section. Comparison of initial data with data

taken during periodic adjustments assists in preventive

maintenance and troubleshooting.

Note

Control settings are called out for a HP

8555A Spectrum Analyzer RF Section.

If the RF Section used is a HP 8554B

disregard BAND and SIGNAL

IDENTIFIER control settings.

Otherwise, the Spectrum Analyzer

control settings apply to either

instrument.

5-4. EQUIPMENT REQUIRED

5-5. Each check and adjustment procedure contains

a list of test equipment required for that particular test.

Table 1-3 contains a tabular list of test equipment and

accessories required. In addition, the table contains the

required minimum specifications and a suggested

manufacturers model number.

5-6. FACTORY SELECTED COMPONENTS

5-7. Factory selected components are designated by

an asterisk (*) on the schematic diagrams in Section VIII

of this manual. Table 8-1 contains a list of factory

selected components by reference designation, basis of

selection, and schematic diagram location on which the

component is illustrated.

5-1

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-8. Power Supply, Check and Adjustment

REFERENCE: Service Sheet 5.

DESCRIPTION: Power supplies in the Tracking Generator provide regulated output of +20 and -10 volts. The +20 volt

supply is adjustable and provides the reference for the -10 volt supply. These checks verify proper operation of the

power supplies.

Figure 5-1. Power Supply Check and Adjustment Test Setup

EQUIPMENT: Digital Voltmeter with 3443A Plug-in ........................................................... HP 3440A

AC Voltmeter (Multifunction Voltmeter) ....................................................... HP 410C

Variable Voltage Transformer ..................................................................... General Radio W5MT3A

AC Voltmeter .............................................................................................. HP 400E

Cable Assy (terminated with probe and alligator clip) .................................. HP 10501A

Cable Assy (dual banana plug to probe and alligator clip) ............................ HP 11003A

PROCEDURE:

1. Connect test setup as indicated in Figure 5-1.

2. Remove top cover and right side cover from Tracking Generator.

3. Connect digital voltmeter test leads to AlTP1 and chassis ground.

4. Remove shield from power line module and connect ac voltmeter (HP 410C) across the outside terminals of the

ACCESSORY OUTLET connector J6. (The outside terminals of J6 are connected by the 98 and 908 color coded

wires to the power line module.)

5-2

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5. Apply power to the Tracking Generator. Measure and record the +20 volt output. Vary the input ac line voltage

from 103.5 to 126.5 volts. The +20 volt regulated output should not vary more than 20 mV.

AC Input +20 Vdc Output

103.5V _____________

115V _____________

126.5V _____________

6. Set ac line voltage to 115 volts. Adjust AlR14 for +20.00 Vdc +20 mV at test point A1TP1.

7. Disconnect ac voltmeter from connector J6.

8. Connect digital voltmeter to A7C3 and chassis ground (-10 volt test point).

9. Measure and record voltage level. Voltage level should be -10.0 +0.5 volts.

-10.0 Vdc Output ______________

10. Set HP 400E AC Voltmeter RANGE to .001 VOLTS full scale and measure ac ripple on +20 and -10 volt sense

lines. Ripple should be less than 200 pV. Measure and record ac ripple between power supply sense lines and

chassis ground.

+20 Volt Output XA1 pin 6________

-10 Volt Output A7C3____________

11. Remove input line power and replace cover over power line module.

12. Replace right side cover and top cover.

13. If the dc supplies are out of tolerance, refer to Service Sheet 5 for trouble isolation procedure.

5-3

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-9. 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment

REFERENCE: Service Sheet 3.

DESCRIPTION: The 1.55 GHz local oscillator is checked for power output level and frequency tuning range. Oscillator

frequency is determined primarily by the LO cavity, with tuning range determined by the drive voltage from the oscillator

driver. The oscillator is checked first for power level and then for frequency and tuning range.

Figure 5-2. 1.55 GHz LO Power Level and Frequency Check and Adjustment Test Setup

EQUIPMENT: Power Meter with HP 8478B Thermistor Mount............................................HP 432A

Frequency Counter with HP 5254C Plug-in ................................................HP 5245L

Digital Voltmeter with HP 3443A Plug-in .....................................................HP 3440A

Test Leads (dual banana plug to probe and alligator clip) ...........................HP 11003A

Cable Assy, SMA male to BNC male ...........................................................HP 08555-60076

Cable Assy, male BNC connectors ..............................................................HP 10503A

Coaxial Attenuator, Option 010 ...................................................................HP 8491A

Adapter BNC barrel (HP Part Number 1250-0080) .....................................UG 914A/U

Adapter (BNC to Type N) ............................................................................UG 201A/U

PROCEDURE:

1. Perform Power Supply Check and Adjustment, paragraph 5-8.

2. Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize.

3. Disconnect Cable W8 at Isolator AT3 J2 (see Figures 8-4 and 8-12).

4. With test setup as indicated in Figure 5-2, connect Power Meter to Isolator AT3 J2 via 08555-60076 cable, .10

dB attenuator and UG 914A/U adapter.

5. Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power Meter.

6. Minimum power output must be greater than +5 dBm.

>+5 dBm

5-4

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-9. 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment (cont'd)

7. Connect Frequency Counter to Isolator AT3 J2 via 08555-60076 cable, UG 914A/U adapter and BNC to BNC

cable.

8. Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency.

1, 548, 000 ±500 kHz _____

9. Rotate TRACK ADJ control fully clockwise and record oscillator frequency

1, 552, 000 +500 kHz ______

10. Record frequency tuning range (frequency recorded in step 9 minus frequency recorded in step 8).

4, 000 ±500 kHz __________

11. If data recorded in steps 8, 9, and 10 is within tolerance no adjustment is required.

12. If data recorded in steps 8, 9, or 10 is not within tolerance proceed with step 13.

13. Connect Digital Voltmeter to test point A2TP5.

14. Set TRACK ADJ control fully clockwise. Set "MAX" TUNE potentiometer A2R26 and "MIN" TUNE potentiometer

A2R27 fully counterclockwise. Measure voltage at A2TP5. Voltage should be +1 *0.1 Vdc.

+0.9_________+1.1 Vdc

15. Measure and record oscillator frequency.

16. Adjust "MAX" TUNE potentiometer A2R26 to increase oscillator frequency 4, 000 +50 kHz above frequency

recorded in step 15. Record oscillator frequency.

17. Set TRACK ADJ control to center of tuning range recorded in steps 15 and 16 above. Record oscillator

frequency.

18. If frequency recorded in step 17 is not within +500 kHz of 1.550 GHz adjust A7ADJ 1 to tune oscillator frequency

to 1.550 GHz±100 kHz.

19. If oscillator frequency is adjusted, repeat steps 15 through 18.

20. Disconnect Power Meter and connect W8 Cable to Isolator AT3 J2.

21. Replace right side panel cover.

5-5

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-10. 1.55 GHz Oscillator Residual FM Check

REFERENCE: Service Sheet 3.

DESCRIPTION: The 1.55 GHz oscillator is checked for residual FM by mixing the oscillator output with a stable signal

source and observing the resultant output on a calibrated spectrum analyzer display. The second converter in Tracking

Generator is used to mix the oscillator output with the 1500 MHz comb signal from a Frequency Comb Generator. The

mixer output is displayed using a HP 141T/8553B/8552B Spectrum Analyzer System which has less than 20 Hz peak-to-

peak residual FM. There are no adjustments for oscillator residual FM. Perform power supply check for excessive ripple

if residual FM is excessive.

Figure 5-3. 1.55 GHz LO Residual FM Check Test Setup

EQUIPMENT: Spectrum Analyzer System ........................................................................HP 141T/8553B/8552B

Frequency Comb Generator ........................................................................HP 8406A

Cable Assy, Selectro male to Selectro female ............................................HP 11592-60003

Cable Assy, Selectro female to BNC male (2 each)......................................HP 11592-60001

Adapter (BNC to Type N) ............................................................................UG 201A/U

PROCEDURE:

1. Perform Power Supply Check and Adjustment, paragraph 5-8.

2. Perform 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment, paragraph 5-9.

3. Apply power to Spectrum Analyzer System, Frequency Comb Generator and Tracking Generator. Allow at least

one (1) hour for equipment stabilization.

4. Disconnect Cable W4 at Mixer Assy A6 and Cable W8 at First Converter A5J2 (see Figures 8-4 and 8-12).

Connect 11592-60003 cable between W8 and A6 J1.

5. Disconnect Cable W9 from A6 J2 and connect 11592-60001 cable between A6 J2 and Frequency Comb

Generator.

6. Disconnect Cable W10 from A6 J3 and connect 11592-60001 cable between A6 J3 and Spectrum Analyzer RF

input.

7. Set instrument controls as follows:

5-6

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-10. 1.55 GHz Oscillator Residual FM Check (cont'd)

Tracking Generator

LINE OFF/ON .............................................................................................. .ON

TRACK ADJ................................................................................................. Centered

Frequency Comb Generator

COMB FREQUENCY - MHz ....................................................................... 100 MHz

OUTPUT AMPLITUDE ............................................................................... Maximum (CW)

Spectrum Analyzer

POWER ...................................................................................................... ON

RANGE MHz ............................................................................................... 0-110

FREQUENCY ............................................................................................. 50 MHz

BANDWIDTH . .......................................................................................... 30 kHz

SCAN WIDTH ............................................................................................. PER DIVISION

SCAN WIDTH PER DIVISION ................................................................... 1 MHz

INPUT ATTENUATION................................................................................ 0 dB

TUNING STABILIZER.................................................................................. ON

SCAN TIME PER DIVISION ....................................................................... 20 MILLISECONDS

LOG/LINEAR .............................................................................................. 10 dB LOG

LOG REF LEVEL ........................................................................................ +10 dBm

VIDEO FILTER . ........................................................................................ 10 kHz

SCAN MODE ............................................................................................. INT

SCAN TRIGGER . ..................................................................................... AUTO

8. Rotate Tracking Generator TRACK ADJ control while observing CRT display.

NOTE

With the 1.55 GHz oscillator tuned to 1550 MHz both the 1500 and 1600 MHz comb signals will

produce a response at 50 MHz.

9. Adjust the TRACK ADJ control until the responses are separated by 2 MHz (2 divisions) on the display.

10. Adjust Spectrum Analzyer FREQUENCY control to center largest response on CRT display.

11. Reduce BANDWIDTH to 1 kHz and SCAN WIDTH PER DIVISION to 2 kHz while keeping signal centered on

CRT display.

12. Switch Spectrum Analyzer LOG/LINEAR to LINEAR and adjust sensitivity controls for a full eight division display.

13. Refer to Figure 5-4. Tune FINE TUNE so that the upward slope of the display intersects the CENTER

FREQUENCY graticule line one division from the top.

NOTE

The linear portion of the analyzer IF filter skirt is used to slope detect low-order residual FM. The

analyzer is stabilized, and the detected FM is displayed in the time domain.

5-7

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-10. 1.55 GHz Oscillator Residual FM Check (cont'd)

14. Note where the slope intersects the middle horizontal

graticule line: Horizontal Displacement: ___________

divisions

15. Use the horizontal displacement to calculate demodulation

sensitivity.

a. Convert the horizontal displacement(divisions) into Hertz.

Example: (2 kHz SCAN WIDTH) x (0.2

div) = 400 Hz.

b. Calculate demodulation sensitivity by dividing the vertical

displacement in divisions into the horizontal displacement in Hz:

400 H z/di Figure 5-4. Demodulation Sensitivity

Example: = 133 Hz/div Measurement

3 divisions

16. Turn SCAN WIDTH to ZERO scan. Set FINE TUNE for a response level within the calibrated three division

range (one division from the top to the center horizontal graticule line).

17. Measure the peak-to-peak deviation, and multiply it by the demodulation sensitivity obtained in step 15b above.

Example: 0.5 div p-p signal deviation x 133 Hz/div = 66.5 Residual FM.

Hz peak-to-peak

18. Install cables removed in steps 4 through 6.

5-8

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-11. First Converter Check and Adjustment

REFERENCE: Service Sheet 3.

DESCRIPTION: The 1.55 GHz oscillator cavity and the two 2.05 GHz IF bandpass cavities in the first converter are

adjusted for maximum output signal level. A 8555A Spectrum Analyzer System (8555A/ 8552/140) should be used

during the adjustment procedure. In addition to providing the third LO input signal the output signal can be displayed

during the adjustment. With the analyzer operating in the linear mode, the cavities are alternately adjusted for maximum

indication on the CRT. When only the 8554L Spectrum Analyzer System is available, the output can be monitored using

a power meter such as the HP 432B.

Figure 5-5. First Converter Check and Adjustment Test Setup

EQUIPMENT: Spectrum Analyzer....................................................................................... HP 8555A/8552/141T

Cable Assembly ......................................................................................... HP 11592-60001

Adapter ....................................................................................................... UG 201A/U

Wrench ........................................................................................................ 5/16 inch

Allen Driver ................................................................................................. No.10

PROCEDURE:

1. Perform 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment, paragraph 5-9.

2. With test setup as indicated in Figure 5-5, set controls as follows:

Tracking Generator

LINE ............................................................................................................ ON

TRACK ADJ ................................................................................................ Centered

LEVEL ......................................................................................................... 0 dBm

Spectrum Analyzer

BAND........................................................................................................... n=1 - (2.05 GHz IF)

FREQUENCY .............................................................................................. 500 MHz

BANDWIDTH . .......................................................................................... 100 kHz

SCAN WIDTH PER DIVISION .................................................................... 5 MHz

INPUT ATTENUATION .............................................................................. 20 dB

SCAN TIME PER DIVISION ....................................................................... 20 MILLISECONDS

LOG REF LEVEL ........................................................................................ (+) 10 dBm

LOG/LINEAR .............................................................................................. 10 dB LOG

5-9

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

VIDEO FILTER ............................................................................................ 10 kHz

SCAN MODE. ............................................................................................ INT

SCAN TRIGGER ......................................................................................... AUTO

3. Disconnect W6 cable at RF OUT of 500 MHz Amplifier Assembly A4.

4. Connect 11592-60001 cable between A4 RF OUT and Spectrum Analyzer INPUT using UG 201A/U adapter.

5. Record 500 MHz signal level. ≅0 dBm _______

6. Disconnect 11592-60001 cable from A4 RF OUT connector.

7. Install W6 cable removed in step 3 above.

8. Disconnect W9 cable at A5 J3 and connect 11592-60001 cable between A5 J3 and Spectrum Analyzer INPUT.

9. Select Spectrum Analyzer n=1- (550 MHz IF) BAND and adjust FREQUENCY control for dial indication of 2050

MHz.

10. Set Spectrum Analyzer LOG/LINEAR switch to LINEAR and adjust LINEAR SENSITIVITY controls to position

signal peak between the 5 and 7 LIN graticule lines.

11. Adjust A5 ADJ 1 (1.55 GHz oscillator cavity) for peak signal indication on CRT display.

12. Alternately adjust A5 ADJ 2 and ADJ 3 (2.05 GHz IF bandpass cavities) for peak signal indication on CRT

display.

13. Repeat steps 11 and 12 above.

14. Set Spectrum Analyzer SCAN PER DIVISION to 1 MHz.

15. Tune Tracking Generator TRACK ADJ through its tuning range while observing the CRT display.

16. The passband should be similar to that displayed in Figure 5-6. If not, set TRACK ADJ to center of passband

and repeat steps 11 through 15.

17. Set Spectrum Analyzer LOG/LINEAR switch

to LOG, measure and record first converter

output signal level.

≥-7 dBm _______

18. Install W9 cable between A5 J3 and A6 J2.

Figure 5-6. First Converter Passband

CR T Display

5-10

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-12. Automatic Level Control (ALC) Check and Adjustment

REFERENCE: Service Sheet 3.

DESCRIPTION:

The modulator driver functions as an operational amplifier in the ALC loop. A 10 kHz signal is applied to the operational

amplifier and the loop gain is adjusted while maintaining 0 dB output level. A limiter in the amplifier circuit is adjusted to

prevent a large swing in the driver output when the analyzer sweeps through zero frequency. Perform Level Control

Calibration, paragraph 513, after ALC loop adjustment.

Figure 5-7. Automatic Level Control (ALC) Check and Adjustment Test Setup

EQUIPMENT: Spectrum Analyzer ..................................................................................... HP 8555A/8552/141T

Power Meter ................................................................................................ HP 432A

Thermistor Mount ........................................................................................ HP 8478B

AC Voltmeter .............................................................................................. HP 400E

DC Voltmeter (RF Millivoltmeter) ................................................................. HP 412A

Test Oscillator ............................................................................................. HP 652A

Test Lead with alligator clips ........................................................................

Cable Assembly ........................................................................................... HP 10501A* (2)

Resistor........................................................................................................ (100K ohm 5%, 1 watt)

*Terminated with alligator clips

PROCEDURE:

1. Perform Spectrum Analyzer calibration procedure; refer to appropriate operation and service manual.

2. Connect test setup as indicated in Figure 5-7 and set controls as follows:

Spectrum Analyzer

BAND........................................................................................................... n=1 - (2.05 GHz IF)

FREQUENCY .............................................................................................. 30 MHz

BAND........................................................................................................... 100 kHz

SCAN .......................................................................................................... ZERO

5-11

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-12. Automatic Level Control (ALC) Check and Adjustment (cont'd)

INPUT ATTENUATION........................................................................ 10 dB

TUNING STABLIZER .......................................................................... ON

SIGNAL IDENTIFIER........................................................................... OFF

BASE LINE CLIPPER ......................................................................... Max CCW

SCAN TIME PER DIVISION ................................................................ 10 MILLISECONDS

LOG REF LEVEL ................................................................................ +10 dBm

LOG/LINEAR ...................................................................................... LOG

VIDEO FILTER ................................................................................... OFF

SCAN MODE ..................................................................................... INT

SCAN TRIGGER . ............................................................................. AUTO

Tracking Generator

LINE .................................................................................................... ON

TRACK ADJ ....................................................................................... Peak signal indication on CRT

LEVEL ............................................................................................... 0 dBm

3. Allow instruments to warm up and stabilize for at least 30 minutes.

4. Adjust TRACK ADJ for maximum signal indication on CRT display.

5. Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT.

6. Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT.

7. Connect test lead jumper between A2TP1 and A2TP2.

8. Adjust A2R17 "NULL ADJ" for output level of 0 1.0 dBm indication on Power Meter.

9. Remove jumper between A2TP1 and A2TP2.

10. Adjust A2R41 "O dBm LEVEL" for output level of 0 +0.5 dBm indication on Power Meter.

11. Adjust Test Oscillator for 10 kHz output.

12. Connect Test Oscillator output through 100K ohm resistor to A2TP4.

13. Connect AC Voltmeter to A2TP1.

14. Adjust Test Oscillator output amplitude for an indication of -7 dB (.001 VOLTS RANGE) on AC Voltmeter.

15. Connect AC Voltmeter to A2TP2.

16. Adjust A2R7 "GAIN ADJ" for an indication of -10 dB (.001 VOLTS RANGE) on AC Voltmeter.

17. Adjust A2R17 "NULL ADJ" for Tracking Generator output of 0 dBm.

18. Repeat steps 16 and 17 until both levels are obtained.

19. Disconnect AC Voltmeter and Test Oscillator.

20. Repeat steps 7 through 10 above.

21. Connect DC Voltmeter across A2TP1 and A2TP3, COM to A2TP1 and VOLTS to A2TP3.

5-12

TM 11-6625-2866-14&P

Model 8444A Adjustments

ADJUSTMENTS

5-12. Automatic Level Control (ALC) Check and Adjustment (cont'd)

22. Adjust A2R6 "LIMIT SET" for an indication of +0.3 Vdc on DC Voltmeter.

23. Disconnect DC Voltmeter.

24. Perform Level Control Calibration, paragraph 5-13.

5-13. Level Control Calibration Check and Adjustment

REFERENCE: Service Sheet 4.

DESCRIPTION: The level control circuitry is adjusted to provide a 10 dB tuning range of the front panel LEVEL control.

The level control circuitry provides the voltage level to the reference diode in the ALC detector. Perform Automatic

Level Control Check and Adjustment, paragraph 512, before calibrating the level control.

Figure 5-8. Level Control Calibration Check and Adjustment Test Setup

EQUIPMENT: Spectrum Analyzer ..................................................................................... HP 8555A/8552B/141T

Power Meter ................................................................................................ HP 432A

Thermistor Mount ........................................................................................ HP 8478B

PROCEDURE:

1. Connect test setup as indicated in Figure 5-8 and set controls as follows:

Spectrum Analyzer

BAND........................................................................................................... n=1 - (2.05 GHz IF)

FREQUENCY .............................................................................................. 30 MHz

BANDWIDTH............................................................................................... 100 kHz

SCAN WIDTH . .......................................................................................... ZERO

INPUT ATTENUATION ............................................................................... 20 dB

TUNING STABILIZER ................................................................................. ON

SIGNAL IDENTIFIER . .............................................................................. OFF

BASE LINE CLIPPER ................................................................................. Max CCW

SCAN TIME PER DIVISION......................................................................... 10 MILLISECONDS

LOG REF LEVEL ........................................................................................ +10 dBm

LOG/LINEAR .............................................................................................. LOG

5-13

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Model 8444A Adjustments

ADJUSTMENTS

5-13. Level Control Calibration Check and Adjustment (cont'd)

VIDEO FILTER ................................................................................... OFF

SCAN MODE ...................................................................................... INT

SCAN TRIGGER.................................................................................. AUTO

Tracking Generator

LINE..................................................................................................... ON

TRACK ADJ......................................................................................... Peak signal indication on CRT

LEVEL ................................................................................................. OdBm

2. Adjust TRACK ADJ for maximum signal indication on CRT display.

3. Disconnect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT.

4. Connect Thermistor Mount and Power Meter to Tracking Generator RF OUTPUT.

5. Adjust A2R41 "O dBm LEVEL" for an indication of 0 ±0.5 dBm on Power Meter.

6. Set Tracking Generator LEVEL control fully counterclockwise.

7. Adjust A2R40 "'-10 dBm LEVEL" for an indication of -10 to -12 dBm on Power Meter.

8. Set Tracking Generator LEVEL control to 0 dBm.

9. Repeat steps 5 through 7 until Power Meter indicates 0 dBm with LEVEL control fully clockwise.

10. Disconnect Power Meter and Thermistor Mount from Tracking Generator RF OUTPUT.

11. Connect cable between Tracking Generator RF OUTPUT and Spectrum Analyzer INPUT.

12. Set Tracking Generator TRACK ADJ for maximum signal level on Spectrum Analyzer CRT display.

13. Note and record signal level at 30 MHz. 0 +0.5 dBm

5-14

TM 11-6625-2866-14&P

Model 8444A Adjustments

Table 5-1 . Check and Adjustment Test Card

5-15/(5-16)

TM 11-6625-2866-14&P

Model 8444A Replaceable Parts

SECTION VI

REPLACEABLE PARTS

6-1. INTRODUCTION

6-2. This section contains information for ordering

parts. Table 6-1 lists abbreviations used in the parts list

and throughout the manual. Table 6-2 lists all

replaceable parts in reference designator order. Table

6-3 contains names and addresses that correspond to

the manufacturer's code numbers.

6-3. ABBREVIATIONS

6-4. Table 6-1 gives a list of abbreviations used in

the parts list, schematics, and throughout the manual.

In some cases, two forms of the abbreviations are

given:

one is in capital letters, while the other is partial or no

capitals. This occurs because in the parts list,

abbreviations are all capitalized. However, in the

schematics and other parts of the manual, other

abbreviation forms are used with both lower case and

upper case letters.

6-5. REPLACEABLE PARTS LIST

6-6. Table 6-2 is a list of replaceable parts and is

organized as follows:

a. Electrical assemblies and their components

in alpha-numerical order by reference designation.

b. Chassis-mounted parts in alpha-numeric

order by reference designation.

c. Miscellaneous parts.

The information given for each part consists of the

following:

a. The Hewlett-Packard part number.

b. The total quantity (Qty) used in the

instrument.

c. The description of the part.

d. The typical manufacturer of the part in a five-

digit code.

e. Manufacturer code number for the part.

The total quantity for each part is given only once - at

the first appearance of the part number in the list.

6-7. ORDERING INFORMATION

6-8. To order a part listed in the replaceable parts

table, note the Hewlett-Packard part number and then

Cross-Reference that part number to the National Stock

Number listed in table 6-5. Then order through normal

ordering channel 1 s.

6-9. If the part number does not have a National

Stock Number, then order through normal ordering

channels using the Hewlett-Packard part number.

6-10. Refer to table 6-4 for part number to NSN cross-

reference.

6-1

TM 11-6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-1. Reference Designations and Abbreviations

6-2

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-1. Reference Designations and Abbreviations (Cont’d)

6-3

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-2. Replaceable Parts

Reference HP Part Number Qty Description Mfr Mfr Part Number

Designation Code

A1 08444-60001 1BOARD ASSY:POWER SUPPLY 28480 08444-60001

A1C1 0160-3460 2C:FXD CER 0.05 UF +80-20Z 100VDCW 56289 C023El06 L503LS22-CDM

A1C2 0180-0116 4C:FXD ELECT 6.8 UF 10 35VDCW 56289 1500685X903582-DYS

A1C3 0160-2199 2C:FXO M1CA 30 PF 5% 300VDCW 28480 0160-2199

A1C4 0180-0228 3C:FXD ELECT 22 UF 105 15VDCW 56289 150D0226X9015B2-DYS

A1C5 0180-0116 C:FXD ELECT 6.8 UF 10% 35VDCW 56289 1500685X903582-DYS

A1C6 0160-3460 C:FXD CER 0.05 UF +80-203 100VDCW 56289 C023El101OL503ZS22-CDM

A1C7 0160-2199 C:FXD 11CA 30 PF 5% 300VDCW 28480 0160-2199

A1C8 0180-0228 C:FXD ELECT 22 UF 10 15VDCW 56289 1500226X901582-DYS

A1C9 0180-0116 C:FXD ELECT 6.8 UF 10% 35VDCW 56289 1500685X903582-DYS

A1CR1 1901-0159 8DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR2 1901-0159DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR3 1901-0159 DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR4 1901-0159 DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR5 1901-0040 5DIODE:SILICON 30MA 30WV 07263 FDG1088

A1CR6 1901-0200 2DIODE:SILICON 100 PIV 3A 02735 1N4998

A1CR7 1901-0200 DIODE:SILICON 100 PIV 3A 02735 1N4998

A1CR8 1902-3182 1DIODE BREAKDOWN:SILICON 12.1V 5% 28480 1902-3182

A1CR9 1902-3256 1DIODE:BREAKOOWN SILICON 23.78 5% 28480 1902-3256

A1CR10 1884-0012 1RECTIFIER:SILICON CONTROLLED 2N3528 02735 2N3528

A1CR11 1902-0761 1DIODE:BREAKDOWN 5.9 TO 6.5V 12954 1N821

A1CR12 1901-0159 DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR13 1901-0156 DIODE:SILICON 0.75A 400IV 04713 SR1358-4

A1CR13 1901-0159 DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR14 1901-0159 D1ODE:SILICON 0.75A 400PIV 04713 SR1358-4

A1CR15 1901-0159 DIODE:SILICON 0.75A 400PIV 04713 SR1358-4

AiCR16 1901-0040 DIODE:SILICON 30MA 30WV 07263 FDG1088

A1F1 2110-0012 2FUSE:0.5 AMP 250V 75915 312.500

A1F2 2110-0012 FUSE:0.5 AMP 250V 75915 312.500

A1MP1 2110-0269 4CL1P:FUSE 0.250" DIA 91506 6008-32CN

A1MP2 2110-0269 CL1P:FUSE 0.250” DIA 91506 6008-32CN

A1MP3 2110-0269 CLIP:FUSE 0.250" D1A 91506 6008-32CN

A1MP4 2110-0269 CLIP:FUSE 0.250" D1A 91506 6008-32CN

A1Q1 1853-0020 7TSTR:SI PNP[SELECTED FROM 2N37021 28480 1853-0020

A1Q2 1853-0012 2TSTR:SI PNP 80131 2N2904A

A1Q3 1854-0039 2TSTR:SI NPN 80131 2N3053

A1Q4 1854-0071 3TSTR:SI NPN(SELECTED FROM 2N3704) 28480 1854-0071

A1Q5 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A1Q6 1854-0039 TSTR:SI NPN 80131 2N3053

A1Q7 1854-0071 TSTR:SI NPN(SELECTED FROM 2N3704) 28480 1854-0071

A1R1 0698-3160 2R:FXD MET FLM 31.6K OHM 1% 1/8W 28480 0698-3160

A1R2 0698-3445 2R:FXD MET FLM 348 OHM 1X 1/8W 28480 0698-3445

A1R3 0757-0440 4R:FXD MET FLM 7.50K OHM 1t 1/8W 28480 0757-0440

A1R4 0811-1666 2R:FXD MWW 1.0 OHM 5% 2W 28480 0811-1666

A1R5 0698-3441 4R:FXD MET FLM 215 OHM 12 1/8W 28490 0698-3441

A1R6 0157-0440 R:FXD MET FLM 7.50K OHM 1% 1/8W 28480 0757-0440

A1R7 0757-0280 5R:FXD MET FLM 1K OHM 1% 1/8W 28480 0757-0280

A1R8 0757-0401 3R:FXD MET FLM 100 OHM 1% 1/8W 28480 0757-0401

1AR9 0757-0438 3R:FXD MET FLM 5.11K OHM 1% 1/8W 28480 0757-0438

A1R10 0683-0275 2R:FXD COMP 2.7 OHM 52 1/4W 01121 CB 27G5

A1R11 0757-0280 R:FXD MET FLM LK OHM 1% 1/8W 28480 0757-0280

ALR12 0757-0278 1R:FXD MET FLM 1.78K OHM 1% 1/8W 28480 0757-0278

A1R13 0757-0289 1R:FXD MET FLM 13.3K OHM 3 1/81W 28480 0757-0289

A1R14 2100-1758 3R:VAR WW 1K OHM 53 TYPE V 1W 28480 2100-1758

A1R15 0757-0200 1R:FXO MET FLM 5.62K OHM 1% 1/8W 28480 0757-0200

A1RL16 0811-1666 R:FXD WW 1.0 OHM 5% 2W 28480 0811-1666

A1R17 0698-3441 R:FXD MET FLM 215 OHM 1% 1/8W 28480 0698-3441

A1R18 0757-0440 R:FXD MET FLM 7.50K OHM 1% 1/8W 28480 0757-0440

1AR19 0757-0280 R:FXD MET FLM 1K OHM 1% 1/8W 28480 0757-0280

A1R20 0757-0440 R:FXD MET FLM 7.50K OHM 1% 1/8W 28480 0757-0440

A1R21 0698-0084 3R:FXD MET ELM 2.15K OHM 1% 1/8W 28480 0698-0084

A1R23 0698-0084 R:FXD MET FLM 2.15K OHM 1% 1/8W 28480 0698-0084

A1R22 0698-0084 R:FXD MET FLM 2.15K OHM 1% 1/8W 28480 0698-0084

A1R24 0683-0275 R:FXD COMP 2.7 OHM 5% 1/4W 01121 CB 27G5

A1TB1 08444-20001 1BOARD:BLANK PC 28480 08444-20001

A1TP1 0360-1514 12 TERMINAL PIN:SQUARE 28480 0360-1514

A1TP2 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A1TP3 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A1TP4 0360-1514 TERMINAL PIN:SOUARE 28480 0360-1514

A1TP5 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A1LT6 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A1U1 1820-0223 3INTEGRATED CIRCUIT:OPERATIONAL AMPL. 28480 1820-0223

A1U2 1820-0223 INTEGRATED CIRCUIT:OPERATIONAL AMPL. 28480 1820-0223

A2 08444-60002 1BOARD ASSY:DRIVER 28480 08444-60002

A2C1 0180-0116 C:FXO ELECT 6.8 UF 10% 35VDCW 56289 150D685X903582-DYS

A2C2 0180-2205 1C:FXD ELECT 0.33 UF 10% 35VDCW 56289 1500334X9035A2-DYS

6-4

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-2. Replaceable Parts

Reference HP Part Number Qty Description Mfr Mfr Part Number

Designation Code

A2C3 0180-0228 C:FXD ELECT 22 UF 10% 15VDCW 56289 1500226X901582-DYS

A2C4 0180-1746 1C:FXD ELECT 15 UF 10% 20VDCW 28480 0180-1746

A2C5 0180-0374 2C:FXD TANT. 10 UF 10% 20VDCW 56289 1500106X902082-DYS

A2C6 0160-2208 1C:FXD MICA 330 PF 5% 300VDCW 28480 0160-2208

A2C7 0180-0374 C:FXD TANT. 10 UF 10% 20VDCW 56289 1500106X902082-DYS

A2C8 0160-0300 1C:FXD MY 0.0027 UF 10% 200VDCW 56289 292P27292-PTS

A2CR1 1901-0040 DIODE:SILICON 30HA 30WV 07263 FDG1088

A2CR2 1901-0040 DIOOE:SILICON 30MA 30WV 07263 FDG1088

A2CR3 1901-0040 DIODE:SILICON 30MA 30WV 07263 FDG1088

A2Q1 1854-0221 1TSTR:SI NPN(REPL.BY 2N4044} 28480 1854-0221

A2Q2 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A2Q3 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A2Q4 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A2Q5 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A2Q6 1854-0071 TSTR:SI NPN(SELECTED FROM 2N3704) 28480 1854-0071

A2Q7 1853-0020 TSTR:SI PNP(SELECTED FROM 2N3702) 28480 1853-0020

A2Q8 1853-0012 TSTR:SI PNP 80131 2N2904A

A2R1 0757-0346 3R:FXD MET FLM 10 OHM 1% 1/8W 28480 0757-0346

A2R2 0698-3454 2R:FXD MET FLM 215K OHM 1% 1/8W 28480 0698-3454

A2R3 0757-0280 R:FXD MET FLM 1K OHM 1% 1/8W 28480 0757-0280

A2R4 0757-0280 R:FXO MET FLM 1K OHM 1% 1/8W 28480 0757-0280

A2R5 0757-0438 R:FXO MET FLM 5.11K OHM 1% 1/8W 28480 0757-0438

A2R6 2100-1760 3R:VAR WW 5K OHM 5% TYPE V 1W 28480 2100-1760

A2R7 2100-1760 R:VAR WW 5K OHM 5% TYPE V 1W 28480 2100-1760

A2R8 0698-3444 1R:FXD MET ELM 316 OHM 1% 1/8W 28480 0698-3444

A2R9 0698-3156 1R:FXD MET FLM 14.7K OHM 1% 1/8W 28480 0698-3156

A2R10 0757-0346 R:FXD MET FLM 10 OHM 1% 1/8W 28480 0757-0346

A2R11 0698-3154 1R:FXD MET FLM 4.22K OHM 1% I/8W 28480 0698-3154

A2R12 0757-0346 R:FXD MET FLM 10 OHM 1% 1/8W 28480 0757-0346

A2R13 0698-3454 R:FXD MET FLM 215K OHM 1% 1/8W 28480 0698-3454

A2R14 0757-0424 2R:FXD MET FLM 1.10K OHM 1% 1/8W 28480 0757-0424

A2R15 0698-3437 1R:FXD MET FLM 133 OHM 1% 18W 28480 0698-3437

A2R16 0757-0817 1R:FXD MET FLM 750 OHM 1% 1/2W 28480 0757-0817

A2R17 2100-1758 R:VAR WW IK OHH 5t TYPE V 1W 28480 2100-1758

A2R18 0698-3445 R:FXD MET ELM 348 OHM 1% 18W 28480 0698-3445

A2R19 0757-0401 R:FXD MET FLM 100 OHM 1% 1/8W 28480 0757-0401

A2R20 0757-0416 1R:FXD MET FLM 511 OHM 1% 1/8W 28480 0757-0416

A2R21 0698-3450 1R:FXD MET FLM 42.2K OHM 1% 1/18W 28480 0698-3450

A2R22 0757-0401 R:FXD MET FLM 100 OHM 1% 1/8W 28480 0757-0401

A2R23 0757-1094 1R:FXD MET ELM 1.47K OHM 1% 1/8W 28480 0757-1094

A2R24 0757-0424 R:FXD MET FLM 1.10K OHM 1% 1/8W 28480 0757-0424

A2R25 0698-3441 R:FXD MET FLM 215 OHM 1% 1/8W 28480 0698-3441

A2R26 2100-2522 1R:VAR CERMET 10K OHM 10% LIN 1/2W 28480 2100-2522

A2R27 2100-1758 R:VAR WW 1K OHM 5% TYPE V 1W 28480 2100-1758

A2R28 0757-0442 4R:FXD MET FLM 10.OK OHM 1% 1/8W 28480 0757-0442

A2R29 0757-0465 R:FXD MET FLM 100K OHM 1% 1/8W 28480 0757-0465

A2R30 0757-0288 2R:FXD MET FLM 9.09K OHM 1% 1/8W 28480 0757-0288

A2R31 0757-0442 R:FXD MET FLM 10.0K OHM 1% 1/8W 28480 0757-0442

A2R32 0757-0438 R:FXD MET FLM 5.11K OHM I% 1/8W 28480 0757-0438

A2R33 0698-3441 R:FXD MET FLM 215 OHM i1%1/8W 28480 0698-3441

A2R34 0757-0442 R:FXD MET FLM 10.OK OHM 1% 1/8W 28480 0757-0442

A2R35 0698-3399 1R:FXD MET FLM 133 OHM 1% 1/2W 28480 0698-3399

A2R36 0757-0439 R:FXD MET FLM 6.81K OHM 1% 1/8W 28480 0757-0439

A2R37 0757-0421 1R:FXD MET ELM 825 OHM 1% 1/8W 28480 0757-0421

A2838 0698-3438 1R:FXD MET FLM 147 OHM 1% 1/8W 28480 0698-3438

A2R39 0757-0288 R:FXD MET FLM 9.09K OHM 1% 1/8W 28480 0757-0288

A2R40 2100-2522 1R:VAR WW 10K OHM 10% TYPE V 1W 19701 ET50X103

A2R41 2100-1760 R:VAR WW 5K OHM 5% TYPE V 1W 28480 2100-1760

A2R42 0698-3151 1R:FXD MET FLM 2.87K OHM 1% 1/8W 28480 0698-3151

A2TB1 08444-20002 1BOARD:BLANK PC 28480 08444-20002

A2TP1 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2TP2 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2TP3 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2TP4 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2TP5 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2TP6 0360-1514 TERMINAL PIN:SQUARE 28480 0360-1514

A2UI 1820-0223 INTEGRATED CIRCUIT:OPERATIONAL AMPL. 28480 1820-0223

A3 5086-7025 1AMPLIFIER DETECTOR 28480 0960-2038

A3 NOT FIELD REPAIRABLE

A4 AMPLIFIER ASSY:500 MHZ

A4C1 0160-2357 2C:FXD CER FEED-THRU 1000 PF +80-20% 28480 0160-2357

A4C2 0160-2357 C:FXD CER FEED-THRU 1000 PF +80-20% 28480 0160-2357

A4C3 0160-2152 1C:FXD CER 10 PF 20% 500VDCW 28480 0160-2152

A4J1 1250-1220 2CONNECTOR:RF 50 OHM SCREW-ON TYPE 98291 50-051-0109

A4J2 1250-1220 CONNECTOR:RF 50 OHM SCREW-ON TYPE 98291 50-051-0109

6-5

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-2. Replaceable Parts

Reference HP Part Number Qty Description Mfr Mfr Part Number

Designation Code

A4MP1 08444-00006 1COVER:500 MHZ AMPLIFIER 28480 08444-00006

A4MH2 08444-20011 1HOUSING:500 MHZ AMPLIFIER 28480 08444-20011

A4A1 08444-60005 1BOARD ASSY:500 MHZ AMPLIFIER 28480 08444-60005

A4A1C1 0160-2266 11 C:FXD CER 24 PF 5% 500VDCW 72982 301-000-COGO-240J

A4A1C2 0160-3456 C:FXD CER 1000 PF 10% 250 VDCW 28480 0160-3456

A4A1C3 0160-2266 C:FXD CER 24 PF 5% 500VDCW 72982 301-000-COGO-240J

A4A1C4 0160-2266 C:FXD CER 24 PF 5t 500VDCW 72982 301-000-COGO-240J

A4A1C5 0160-2266 C:FXD CER 24 PF 5% 500VDCW 72982 301-000-COGO-240J

A4A1C6 0160-2266 C:FXD CER 24 PF 5% 500VDCW 72982 301-000-COGO-240J

A4A1C7 0160-2266 C:FXO CER 24 PF 5% 500VDCW 72982 301-000-COGO-240J

A4A1C8 0160-2266 C:FXD CER 24 PF 500VDCW 72982 301-000-COGO-240J

A4A1C9 0160-2266 C:FXD CER 24 PF 500VDCW72982 301-000-COGO-240J

A4A1C10 0160-2266 C:FXD CER 24 PF 500VDCW 72982 301-000-COGO-240J

A4A1C11 0160-2266 C:FXD CER 24 PF 500VDCW 72982 301-000-CG000-240J

A4A1CR1 1901-0639 2DIOOE:PIN 1MHZ TO 1GHZ 28480 1901-0639

A4A1CR2 1901-0639 DIODE:PIN 1MHZ TO 1GHZ 28480 1901-0639

A4A1L1 9100-2252 4COIL/CHOKE 0.27 UH 10% 28480 9100-2252

A441L2 9100-2252 COIL/CHOKE 0.27 UH 10% 28480 9100-2252

A4A1L3 9100-2252 COIL/CHOKE 0.27 UH 10% 28480 9100-2252

A4A1L4 9100-2252 COIL/CHOKE 0.27 UH 10% 28480 9100-2252

A4A1Q1 1854-0345 3TSTR:SI NPN 80131 2N5179

A4A1Q2 1854-0345 TSTR:SI NPN 80131 2N5179

A4A1Q3 1854-0345 TSTR:SI NPN 80131 2N5179

A4A1R1 0698-7197 1R:FXD FLM 23.7 OHM 2% 1/8W 28480 0698-7197

A4A1R2 0698-7236 9R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R3 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R4 0698-7236 R:FXD FLM IK OHM 2% 1/8W 28480 0698-7236

A4A1R5 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R6 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R7 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R8 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R9 0698-7236 R:FXD FLM 1K OHM 2% 1/8W 28480 0698-7236

A4A1R10 0698-7236 R:FXD FLM 1K OHM 22 1/8W 28480 0698-7236

A4A1R11 0693-7214 1R:FXD FLM 121 OHM 2% 1/8W 28480 0698-7214

A4A1TB1 08444-20005 1BOARD:BLANK PC 28480 08444-20005

A5 08444-60011 1CONVERTER ASSY:FIRST 28480 08444-60011

A5J1 1250-0829 5CONNECTOR:RF 50-OHM SCREW ON TYPE 98291 50-045-4610

A5J2 1250-0829 CONNECTOR:KF 50-OHM SCREW ON TYPE 98291 50-045-4610

A5J3 1250-0829 CONNECTOR:RF 50-OHM SCREW ON TYPE 98291 50-045-4610

A5MP1 08555-00033 2INPUT-OUTPUT LOOP 28480 08555-00033

A5MP2 0516-0005 2SCREW:PAN HD SLOT DR 0-80 X 0.188" LG 00000 080

A5MP3 2200-0111 14 SCREW:PAN HD POLI DR 4-40 X 0.500" LG 00000 OBD

A5MP4 08555-20035 1CAVITY BLOCK:SECOND CONVERTER 28480 08555-20035

A5MP5 08444-20012 1COVER:FIRST CONVERTER 28480 08444-20012

A5MP6 2200-0172 2SCREW:FLAT HD POZI DR 4-40 X 0.875" LG 00000 OBD

A5MP7 08444-20007 1CENTER-POST 28480 08444-20007

A5MP8 2740-0001 3NUT:HEX 10-32 THREAD 00000 O8D

A5MP9 3030-0151 4SCREW:SOCKET CAP 4-40 THREAD 28480 3030-0151

A5MP10 3030-0397 3SCREW:SET 10-32 UNF-2A THREAD 00000 OBD

A5A1 08444-60012 1MIXER ASSY:FIRST 28480 08444-60012

A5A1C1 0160-2327 1C:FXO CER 1000 PF 20% 100VDCW 96733 B104BX102M

A5A1C2 0160-3861 1C FXD 18 PF + -5% 250 VDCW 72982 2930-000-3903

A5A1C3 0160-3860 1C:FXD MICA 39 PF 5% 250VDCW 72982 2930-000-390J

A5A1CR1 1901-0633 1DIODE:HOT CARRIER 28480 1901-0633

A5A1J1 1250-0829 CONNECTOR:RF 50-OHM SCREW ON TYPE 98291 50-045-4610

A5A1L1 9100-2254 1COIL/CHOKE .39 UH 10% 28480 9100-2254

A5A1MP1 0520-0128 4SCREW:PAN HD POZI DR 2-56 X 0.250" LG 00000 OBD

A5A1MP2 1251-1556 1CONNECTOR:SINGLE CONTACT 00779 2-330808-8

A5A1MP3 08555-00031 1LID:RESONATOR HOUSING 28480 08555-00031

A5A5MP4 085'5-20036 1RESONATOR HOUSING 28480 08555-20016

A5A1R1 0698-7233 1R:FXD FLM 750 OHM 2% 1/8W 28480 0698-7233

A6 08444-60004 1MIXER ASSY:OUTPUT 28480 08444-60004

A6 NOT RECOMMENDEOD FOR FIELD REPAIR

A7 08444-60019 1 OSCILLATOR ASSY:1.55 GHZ

A7 ·NOT RECOMMENDED FOR FIELD REPAIR 28480 08444-60019

A7CI 0163-3827* 1C:FXD PRC 1 PF 500VDCW 84411 663UW22354W2

A7C2 0160-0345 2C:FXD CEP FEED-THRU 1000 PF 500VDCW 01121 FB2B-102W

A7C3 0160-0345 C:FXD CER FEED-THRU 1000 PP 500VDCW 01121 FB28-102W

A7C4 0160-2437 1C FXD CER 5000 PF +80 -20%

A7CR1 0122-0245 2C:VOLTAGE VAR. 6.8 PF 10% 60VDCW 04713 1N5139

A7J1 1250-0829 CONNECTOR:KF 5-OHM SCREW ON TYPE 98291 50-045-4610

A7L1 1460-0103 1SPRING:COMPRESSION 0.120" OD 00000 O8D

A7Q1 1854-0292 1TSTR:SI NPN 28480 1854-0292

A7R1 0698-7230 1R:FXD FLM 562 OHM 2% 1/8'W 28480 0698-7230

A7R2 0757-0418 1R:FXD MET FLM 619 OHM 1% 1/8W 28480 0757-0418

A8 5060- 1189 POWER LINE MODULE. NON-FILTERED 28480 5060-1189

6-6

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-2. Replaceable Parts

Reference HP Part Number Qty Description Mfr Mfr Part Number

Designation Code

CHASSIS PARTS

AT1 0960-0084 2ISOLATOR:2-PORT 2-4 GHZ 28480 0960-0084

AT2 0960-0084 ISOLATOR:2-PORT 2-4 GHZ 28480 0960-0084

AT3 0960-0168 1ISOLATOR:2-PORT 1.54-1.56 GHZ 28480 0960-0168

AT4 11593A 1TERMINATION:50 OHM 28480 11593A

C1 0180-2181 2C:FXD ELECT 1300 UF +75-10% 50VDCW 56289 3601320050AA2A-DQ8

C1 1210-0013 2BRACKET:MOUNTING FOR 1-3/8 OD 56289 4586-87A

C2 0180-2181 C:FXD ELECT 1300 UF +75-10% 50VDCW 56289 3601320050A02A-DQB

C2 1210-0013 BRACKET:MOUNTING FOR 1-3/8 OD 56289 4586-87A

C3 0160-0155 1C:FXD MY 0.0033 UF 10% 200VDCW 28080 0160-0155

CP1 1250-0838 1CONNECTOR:RF ADAPTER TEE 98291 50-085-0000

F1 2110-0202 1FUSE:0.50A 250V SLOW-BLOW 75915 313.500S

F1 (FOR 115V OPERATION)

F1 2110-02011 FUSE:0.25A 250V SLO-BLO 71400 MDL-1/4

FL1 (FOR 230V OPERATION)

FL1 0960-0167 1FILTER:TUBULAR BANDPASS 2.0-3.4 GHZ 28480 0960-0167

J1MPI 1250-0914 1BODY:RF CONNECTOR 02660 131-150

J1MP2 1250-0915 1CONTACT:RF CONNECTOR 02660 131-149

J1MP3 5040-0306 1INSULATOR 28480 5040-0306

J1M4 08555-20093 1CONTACT:JACK 28480 08555-20093

J1MP5 08555-20094 1BODY:BULKHEAD 28480 08555-20094

J1MP6 2190-0444 1WASHER:LOCK 00000 O8D

J1MP7 2950-0132 1NUT:HEX 7/16-28 00000 O8D

J1MP8 08761-2027 1INSULATOR 28480 08761-2027

J4 1250-0118 1CONNECTOR:BNC 24931 28JR 128-1

J6 1251-2996 1CONNECTOR:AC POWER 28480 1251-2996

Q1 1854-0063 2TSTR:SI NPN 80131 2N3055

Q1 1200-0043 2INSULATOR:TSTR MOUNTING(TO-3) 71785 293011

Q2 1854-0063 TSTR:SI NPN 80131 2N3055

Q2 1200-0043 INSULATOR:TSTR MOUNTING(TO-3) 71785 293011

R1 2100-2730 1R:VAR CERMET 5000 OHM 20% LIN 2W 28480 2100-2730

R1 0370-0133 3KNOB:SKIRTED FOR 0.250" DIA SHAFT 28480 0370-0133

R2 2100-2886 1R:VAR WW 5K OHM 5% LIN 2W 28480 2100-2886

R2 0370-0133 KNOB:SKIRTED FOR 0.250" DIA SHAFT 28480 0370-0133

R3 2100-2728 1R:VAR CERNET 1K OHM 20% LIN 2W 28480 2100-2728

R3 0370-0133 KNOB:SKIRTED FOR 0.250" DIA SHAFT 28480 0370-0133

R4 0698-3449 1R:FXD MET FLM 28.7K OHM 1% 1/8W 28480 0698-3449

R5 0757-3438 1R FXD MET FLM 5.11 OHM 1% 1/8W 28080 0757-0438

S1 3101-1248 1SWITCH:PUSHBUTTON SPDT ILLUMINATED 87034 53-55480-121/A1H

S1DS1 2140-0244 1LAMP:GLOW MINIATURE 95V 87034 A1H

W1 08444-20018 1CABLE ASSY:FIRST LO INPUT 28480 08444-20018

W2 08444-20024 2CABLE ASSY:FILTER 28480 08444-20024

W3 08444-20024 CABLE ASSY:FILTER 28480 08444-20024

W4 08444-20020 1CABLE ASSY:MIXER ISOLATOR 28480 08444-20020

W5 08444-60015 1CABLE ASSY:THIRD LO INPUT 28480 08444-60015

W6 08444-60014 1CABLE ASSY:FIRST CONVERTER 28480 08444-60014

w7 08444-20017 1CABLE ASSY:OSCILLATOR 28480 08444-20017

W8 08444-20026 1CABLE ASSY:FIRST ISOLATOR 28480 08444-20026

W9 09444-20027 1CABLE ASSY:FIRST C OUTPUT 28480 08444-20027

W10 08444-20021 1CABLE ASS¥:MIXER-CIRCUIT 28480 08444-20021

W11 08444-20019 1CABLE ASSY:RF OUTPUT(AUXILIARY) 28480 0844O 20019

W12 08444-20023 1CABLE ASSY:RF OUTPUT 28480 08444-20023

W13 08444-60016 1CABLE ASSY:THIRD LO INPUT 28480 08444-60016

W14 08444-60018 3CABLE ASSY:RF INTERCONNECT 28480 08444-60018

W15 0R444-60018 CABLE ASSY:RF INTERCONNECT 28480 08444-60018

W16 08444-60018 CABLE ASSY:RF INTERCONNECT 28480 08444-60018

W17 08444-60017 1CABLE ASSY:INTERCONNECTING 28480 08444-60017

W18 8120-1348 1CABLE:LINE POWER 28480 8120-1348

XA1 1251-0159 1CONNECTOR:PC EDGE 2 X 15 CONTACT 71785 251-15-30-261

XA2 1251-0135 1CONNECTOR:PC EDGE 15 CONTACT 95354 91-6915-1500-00

XFI 1400-0011 2CLIP:FUSE 75915 #125002

XF1 1400-0011 CLIP:FUSE 75915 #125002

XQ1 1200-0041 2SOCKET:TRANSISTOR 71785 133-32-10-013

XQ2 1200-0041 SOCKET:TRANSISTOR 71785 133-32-10-013

08444-60013 1WIRING HARNESS 28480 08444-60013

T1 9100-3308 1TRANSFORMER: POWER 115-230 VAC 28480 9100-3308

48-440 HZ

6-7

TM 11 -6625-2866-14&P

Model 8444A Replaceable Parts

Table 6-2. Replaceable Parts

Reference HP Part Number Qty Description Mfr Mfr Part Number

Designation Code

MECHANICAL PARTS

MP1 1490-0030 1STAND:TILT 28480 1490-0030-

MP2 5000-0050 2TRIM:SIDES 28480 5000-0050

MP3 5000-0730 2COVER:SIDE 3 X 16( BLUE GRAY) 28480 5000-0730

MP3 5000-8593 2COVER:SIDE 3 X 16(OLIVE GRAY) 28480 5000-8593

MP4 5020-0900 1TRIM:PANEL( LIGHT GRAY) 28480 5020-0900

MP4 5020-6850 1TRIM:PANEL( MINT GRAY) 28480 5020-6850

MP5 5020-0901 1TRIM:PANEL( LIGHT GRAY) 28480 5020-0901

MP5 5020-6851 1TRIM:PANEL(MINT GRAY) 28480 5020-6851

MP6 5040-0170 4GUIDE:PLUG-IN PC BOARD 28480 5040-0170

MP7 50b0-0730 2FRAME ASSY:3 X 16 28480 5060-0730

MP8 5060-0740 1COVER AS5Y:TOP 16L(BLUE GRAY) 28480 5060-0740

MP8 5060-8589 ICOVER ASSY:TOP 16L(OLIVE GRAY) 28480 5060-8589

MP9 5060-0752 1COVER ASSY:BOTTOM 16L(BLUE GRAY) 28480 5060-0752

MP9 5060-8713 1COVER:BOTTOM 28480 5060-8713

MP10 5060-0767 5FOOT ASSY:FM 28480 5060-0767

MP11 5060-0774 1RACK MOUNTING KIT:3H (LIGHT GRAY) 28480 5060-0774

MP11 5060-8739 1KIT:RACK MOUNT 3H (MINT GRAY) 28480 5060-8739

MP12 08443-40002 1TRIM STRIP(LIGHT GRAY) 28480 08443-40002

MP12 08443-40005 1TRIM STRIP(MINT GRAY) 28480 08443-40005

MP13 08444-00001 1PANEL:FRONT(BLACK/LIGHT GRAY) 28480 08444-00001

MP13 08444-00013 1PANEL:FRONT(OLIVE BLACK/MINT GRAY) 28480 08444-00013

MP14 08444-00002 1PLATE:CONNECTOR 28480 08444-00002

MP14 08444-00015 1PLATE:CONNECTOR(OLIVE BLACK) 28480 08444-00015

MP15 09444-00003 1DECK:MAIN 28480 08444-00003

MP16 08444-00004 IPANEL:REAR 28480 08444-00004

MP17 09444-00007 1GUARD 28480 08444-00007

MP18 08445-00008 4CLAMP:FRONT PANEL TRIM 28480 08445-00008

Table 6-3. Code List of Manufacturers

MFR ZIP

NO. MANUFACTURER NAME ADDRESS CODE

00000 U.S.A. COMMON ANY SUPLIER OF U.S.A.

00779 AMP INC.(AIRCRAFT MARINE PROD.) HARRISBURG, PA. 17101

01121 ALLEN BRADLEY CO. MILWAUKEE, WIS. 53204

03553 AMPHENOL CORP. BRDADVIEW, ILL. 60153

02735 RCA SOLID STATE & RECEIVING TUBE DIV. SOMERVILLE, N.J. 08876

04713 MOTOROLA SEMICONDUCTOR PROD. INC. PHOENIX, ARIZ. 85008

07203 FAIRCHILD CAMEPA & INST. CORP. SEMICONDUCTOR DIV. MOUNTAIN VIEW, CALIF. 94040

12954 DICKSON ELECTRONIC CORP. SCOTTSDALE, ARIZ. 85252

24931 SPECIALTY CONNECTOR CO. INC. INDIANAPOLIS, IND. 46227

28480 HEWLETT-PACKARD COMPANY PALO ALTO, CALIF. 94304

56289 SPRAGUE ELECTRIC CO. N. ADAMS, MASS. 01247

71400 BUSSMANN MFG. DIV. MC GRAW-EDISON CO. ST. LOUIS, MO. 63017

71785 CINCH MFG. CO. DIV TRW INC. ELK GROVE VILLAGE, ILL.

72982 ERIE TECHNOLOGICAL PROD. INC. ERIE, PA. 16512

75915 LITTELFUSE INC. DES PLAINES, ILL. 60016

80131 ELECTRONIC INDUSTRIES ASSOCIATION WASHINGTON D.C. 20006

87034 MARCOAK INDUSTRIES ANAHEIM, CALIF. 92803

91506 AUGAT INC. ATTLEBORO, MASS. 02703

95354 METHODE MFG. CO. ROLLING MEADOWS, ILL. 60008

96733 SAN FERNANDO ELECT. MFG. CO. SAN FERNANDO, CALIF. 91341

98291 SEALECTRO CORP. MAMAPONECK, N.Y. 0544

6-8

TM 11-6625-2866-14&P

Table 6-4.

PART NUMBER - NATIONAL STOCK NUMBER CROSS REFERENCE INDEX

NATIONAL NATIONAL

PART STOCK PART STOCK

NUMBER FSCM NUMBER NUMBER FSCM NUMBER

A1H 87034 6240-00-951-3376 0698-3160 28480 5905-00-974-6078

B104BX102M 96733 5910-00-244-7171 0698-3399 28480 5905-00-405-2867

FDG1088 07263 5961-00-928-7939 0698-3437 28480 5905-00-402-7080

SR1358-4 04713 5961-00-496-7363 0698-3438 28480 5905-00-974-6080

0121-0414 28480 5910-00-402-1910 0698-3441 28480 5905-00-974-6076

0160-0155 28480 5910-00-719-4370 0698-3444 28480 5905-00-974-6079

0160-0300 28480 5910-00-058-7916 0698-3445 28480 5905-00-493-4289

0160-0345 28480 5910-00-803-4398 0698-3447 28480 5905-00-828-0404

0160-2055 28480 5910-00-211-1611 0698-3449 28480 5905-00-828-0397

0160-2152 28480 5910-00-410-9365 0698-3450 28480 5905-00-826-3262

0160-2199 28480 5910-00-244-7164 0698-3454 28480 5905-00-974-6077

0160-2208 28480 5910-00-430-5685 0698-7200 28480 5905-00-161-8936

0160-2266 28480 5910-00-430-5754 0698-7233 28480 5905-00-160-5437

0160-2327 28480 5910-00-244-7171 0757-0200 28480 5905-00-891-4224

0160-2357 28480 5910-00-451-3194 0757-0278 28480 5905-00-110-0851

0160-2437 28480 5910-00-431-3956 0757-0280 28480 5905-00-853-8190

0160-3456 28480 5910-01-014-2874 0757-0288 28480 5905-00-193-4318

0160-3460 28480 5910-00-008-4458 0757-0289 28480 5905-00-998-1908

0180-0049 28480 5910-00-781-9398 0757-0346 28480 5905-00-998-1906

0180-0116 28480 5910-00-809-4701 0757-0401 28480 5905-00-981-7529

0180-0228 28480 5910-00-719-9907 0757-0416 28480 5905-00-998-1795

0180-0374 28480 5910-00-931-7050 0757-0418 28480 5905-00-412-4037

0180-1746 28480 5910-00-430-6036 0757-0421 28480 5905-00-891-4219

0360-1514 28480 5940-00-150-4513 0757-0424 28480 5905-00-493-0736

0370-0133 28480 5355-00-917-1039 0757-0438 28480 5905-00-929-2529

0698-0082 28480 5905-00-974-6075 0757-0439 28480 5905-00-990-0303

0698-0083 28480 5905-00-407-0052 0757-0442 28480 5905-00-998-1792

0698-0084 28480 5905-00-974-6073 0757-0465 28480 5905-00-904-4412

0698-3151 28480 5905-00-246-8634 0757-0817 28480 5905-00-909-1778

0698-3154 28480 5905-00-891-4215 0757-1094 28480 5905-00-917-0580

0698-3155 28480 5905-00-976-3418 0811-1666 28480 5905-00-402-7082

0698-3156 28480 5905-00-974-6084 08554-00007 28480 5950-00-774-7261

Change 1 6-9

TM 11-6625-2866-14&P

TABLE 6-4

PART NUMBER - NATIONAL STOCK NUMBER CROSS REFERENCE INDEX

NATIONAL NATIONAL

PART STOCK PART STOCK

NUMBER FSCM NUMBER NUMBER FSCM NUMBER

08555-20093 28480 5999-00-008-8444 1902-3182 28480 5961-00-229-1966

0960-0084 28480 5985-00-787-2899 1902-3256 28480 5961-00-412-0957

1N4998 02735 5961-00-994-0520 2-330808-8 00779 5935-00-965-9612

1N5139 04713 5961-00-499-7905 2N2904A 80131 5961-00-913-5195

11593A 28480 5905-00-890-3393 2N3053 80131 5961-00-985-9073

1200-0041 28480 5935-00-971-9712 2N3055 80131 5961-00-985-9074

1200-0043 28480 5970-00-805-7166 2N3528 02735 5961-00-945-3380

1250-0118 28480 5935-00-897-9351 2N5179 80131 5961-00-401-0507

1250-0829 28480 5935-00-428-2944 2100-1758 28480 5905-00-228-5989

1250-0838 28480 5985-00-972-3149 2100-1760 28480 5905-00-229-1971

1250-0914 28480 5935-00-434-3040 2100-1775 28480 5905-00-228-5990

1251-0135 28480 5935-00-972-9464 2100-2522 28480 5905-00-476-5797

1251-0159 28480 5935-00-867-0119 2100-2728 28480 5905-00-161-9093

1251-1556 28480 5999-00-165-0403 2100-2730 28480 5905-00-532-2926

131-149 02660 5999-00-479-8176 2110-0012 28480 5920-00-898-0400

131-150 02660 5935-00-434-3040 2110-0201 28480 5920-00-280-9534

133-32-10-013 71785 5935-00-885-8598 2110-0269 28480 5999-00-333-9620

1400-0011 28480 5999-00-999-6875

1490-0030 28480 6625-00-760-9521 2140-0244 28480 6240-00-951-3376

1820-0223 28480 5962-00-614-5251 251-15-30-261 71785 5935-00-867-0119

1853-0020 28480 5961-00-904-2540 3101-1248 28480 5930-00-476-9679

1854-0063 28480 5961-00-985-9074 3101-1395 28480 5930-00-164-0850

1854-0071 28480 5961-00-137-4608 50-045-4610 98291 5935-00-428-2944

1854-0221 28480 5961-00-836-1887 50-051-0109 98291 5935-00-858-8794

1854-0292 28480 5961-00-476-5731 50-085-0000 98291 5985-00-972-3149

1854-0345 28480 5961-00-401-0507 5000-0050 28480 6625-01-014-8071

1854-0404 28480 5961-00-408-9807 5040-0170 28480 6625-00-911-7214

1901-0040 28480 5961-00-965-5917 5040-0306 28480 5970-00-470-7622

1901-0159 28480 5961-00-496-7363 5060-0767 28480 6625-00-903-0348

1901-0200 28480 5961-00-994-0520 5060-1189 28480 6625-00-434-3251

1901-0633 28480 5961-00-408-9813 8120-1348 28480 6150-01-004-8773

1901-0639 28480 5961-00-787-3394

Change 10 6-10

TM 11-6625-2866-14&P

TABLE 6-4

PART NUMBER - NATIONAL STOCK NUMBER CROSS REFERENCE INDEX

NATIONAL NATIONAL

PART STOCK PART STOCK

NUMBER FSCM NUMBER NUMBER FSCM NUMBER

91-6915-1500-00 95354 5935-00-972-9464

9100-2252 28480 5950-00-430-6904

9100-2254 28480 5950-00-008-4471

Change 1 6-11/(6-12 blank)

TM 11-6625-2866-14&P

Model 8444A Manual Changes

SECTION VII

MANUAL CHANGES

7-1. INTRODUCTION

7-2. This section contains information for adapting

this manual to instruments for which the content does

not apply directly.

7-3. To adapt this manual to your instrument, refer

to Table 7-1 and make all of the manualchanges listed

opposite your instrument serial number

Perform these changes in the sequence listed.

7-4. If your instrument serial number is not listed on

the title page of this manual, or in Table 7-1 below, it

may be documented in a yellow MANUAL CHANGES

supplement. For additional important information about

serial number coverage, refer to INSTRUMENTS

COVERED BY MANUAL in Section I.

Table 7-1. Manual Changes by Serial Number

Serial Prefix or No. Make Manual Changes

1215A A

1208A A, B

1147A A, B, C

7-5. MANUAL CHANGE INSTRUCTIONS

CHANGE A

Page 1-2, Table 1-1:

Change "Nonharmonic (Spurious) Signals" under Spectral Purity to >40 dB below output level.

Page 4-13, Paragraph 4-20:

Change "Nonharmonic (Spurious) Signals" in Specification to read:

>40 dB below output level.

Page 4-15, Paragraph 4-20, Step 12:

Change spurious to <--40 dBm.

Page 4-16, Table 4-1:

Change -35 to -40 for paragraph 4-20, Spurious Signal Level.

CHANGE B

Page 1-2, Table 1-1, change Spectral Purity: Harmonic Distortion specification to read:

Harmonic Distortion: 25 dB below output level.

Page 4-13, Paragraph 4-'20, Harmonic Distortion, change SPECIFICATION to read:

Harmonic Distortion: 25 dB below output level. Nonharmonic (spurious) signals: >40 dB below output level.

Page 4-15, Paragraph 4-20, change to read:

12. Note and record maximum amplitude level of harmonic and spurious signals. Harmonics <--25 dBm

Spurious <--40 dBm

7-1

TM 11-6625-2866-14&P

Model 8444A Manual Changes

CHANGE C

Pages 5-3 through 5-6, Paragraph 5-9 and Figure 5-2, change to read as follows:

5-9.1.55 GHz Oscillator Power Level, Frequency Check and Adjustment

REFERENCE: Service Sheet 3.

DESCRIPTION: The 1.55 GHz local oscillator is checked for power output level and frequency tuning range.

Oscillator frequency is determined primarily by the LO cavity, with tuning range and power output level

determined by the drive voltage from the oscillator driver. The oscillator is checked first for power level and then

for frequency and tuning range. After any adjustments are made the previous checks are repeated.

Figure 7-1. 1.55 GHz LO Power Level and Frequency Check and Adjustment Test Setup

(Manual Figure 5-2)

EQUIPMENT:

Power Meter with HP 8478B Thermistor Mount.........................HP 432A

Frequency Counter with HP 5254C Plug-in..............................HP 5245L

Digital Voltmeter with HP 3443A Plug-in.................................HP 3440A

Power Supply..........................................................................HP 6205B

Test Leads (dual banana plug to probe and alligator clip).......HP 11003A

Cable Assy, SMA male to BNC male.............................HP 08555-60076

Cable Assy, male BNC connectors.........................................HP 10503A

Coaxial Attenuator, Option 010...............................................HP 8491A

Adapter BNC barrel (HP Part Number 1250-0080)................UG 914A/U

Adapter (BNC to Type N)......................................................UG 201A/U

PROCEDURE:

1. Perform Power Supply Check and Adjustment, paragraph 5-8.

2. Apply power to Tracking Generator and allow 1 hour for instrument to warm up and stabilize.

3. Disconnect Cable W8 at Isolator AT3 J2 (see Figures 8-4 and 8-12).

4. With test setup as indicated in Figure 5-2, connect Power Meter to Isolator AT3 J2 via 08555-60076

cable, 10 dB attenuator and UG 914A/U adapter.

5. Rotate TRACK ADJ control throughout its tuning range while noting power level indicated on Power

Meter.

7-2

TM 11-6625-2866-14&P

Model 8444A Manual Changes

5-9. 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment (cont'd)

6. Record minimum power output. >+5 dBm

7. Connect Frequency Counter to Isolator AT3 J2 via 08555-60076 cable, UG 914A/1J adapter and BNC to

BNC cable.

8. Rotate TRACK ADJ control fully counterclockwise and record oscillator frequency. 1,548,000+500 kHz

9. Rotate TRACK ADJ control fully clockwise and record oscillator frequency. 1,552,000+500 kHz

10. Record frequency tuning range (frequency recorded in step 9 minus frequency recorded in step 8).

4,000+500 kHz

11. If data recorded in steps 6, 8, 9, and 10 is within tolerance no adjustment is required.

12. If power level recorded in step 6 is less than +5 dBm proceed to step 23.

13. If data recorded in steps 8, 9, or 10 is not within tolerance proceed with step 14.

14. Connect Digital Voltmeter to test point A2TP5.

15. Set TRACK ADJ -control fully clockwise. Set "MAX" TUNE potentiometer A2R26 fully counterclockwise.

16. Adjust "MIN" TUNE potentiometer A2R27 to set voltage at test point A2I'P5 to level indicated on

oscillator label. (See steps 23 through 30 for method of obtaining voltage level.)

17. Measure and record oscillator frequency.

18. Adjust "MAX" TUNE potentiometer to increase oscillator frequency 4, 000+50 kHz above frequency

recorded in step 17. Record oscillator frequency.

19. Set TRACK ADJ control to center of tuning range recorded in steps 17 and 18 above. Record oscillator

frequency.

20. If frequency recorded in step 19 is not within +500 kHz of 1.550 GHz adjust A7ADJ 1 to tune oscillator

frequency to 1.550 GHz +100 kHz.

21. If oscillator frequency is adjusted, repeat steps 15 through 20.

22. Repeat steps 4 through 11 above.

23. If power level recorded in step 6 is less than +5 dBm connect Power Meter as indicated in step 4.

Remove right side panel cover. Unsolder and remove power wires from A7C2 and A7C3.

24. Adjust Power Supply for -10 and +10 volts. Connect -10 volts to A7C3 and +10 volts to A7C2. Connect

Power Supply ground to solder lug near A7 Oscillator Assembly.

7-3

TM 11-6625-2866-14&P

Model 8444A Manual Changes

5-9. 1.55 GHz Oscillator Power Level, Frequency Check and Adjustment (cont'd)

25. Adjust Power Supply negative voltage for maximum oscillator power level as indicated on Power Meter.

Record power level. >+7 dBm

26. If power level is less than +7 dBm replace Oscillator Assembly A7.

27. If power level is greater than +7 dBm reduce negative voltage from Power Supply to -10 volts.

a. If output level drops 2 dB go to step 30.

b. If output level drops less than 2 dB go to step 28.

c.If output level drops more than 2 dB go to step 29.

28. Increase Power Supply positive voltage approximately 0.5 volts and repeat steps 25 through 27.

29. Decrease Power Supply positive voltage approximately 0.5 volts and repeat steps 25 through 27.

30. Record positive voltage obtained in steps 24, 28 or 29 on label on top of oscillator assembly.

31. Repeat steps 14 through 22.

32. Disconnect Power Meter and connect W8 Cable to Isolator AT3 J2.

33. Replace right side panel cover.

Pages 6-3 through 6-5, Table 6-2, change to read as follows:

A2R29 0698-0465 R:FXD MET FLM 31.6 OHM 1% 1/8W.

A2R36 0757-0442 R: FXD MET FLM 10K OHM 1% 1/8W.

A4A1C2 0160-2266 C:FXD CER 24PF 5% 500 VDCW,

72982, 301-000-COGO-240J

A7 08444-60003 OSCILLATOR ASSY: 1.55 GHz NOT

RECOMMENDED FOR FIELD REPAIR.

A7 C10160-3549 C:FXD PORC 0.5-0.1 PF 500 VDCW,

28480, 0160-3549.

Delete A7C4

A7 R10698-7205 R:FXD MET FLM 51.1 OHM 2% 1/8W.

Delete C3

Delete R5

Page 8-15, Figure 8-12, Service Sheet 3:

Replace with Figure 7-2.

Page 8-21, Figure 8-19:

Replace with Figure 7-3.

7-4

TM 11-6625-2866-14&P

Model 8444A Manual Changes

Figure 7-2. First Converter Circuits, Schematic Diagram, Manual Figure 8-12 (CHANGE C)

7-5

TM 11-6625-2866-14&P

Model 8444A Manual Changes

Figure 7-3. A 7 1.55 GHz Oscillator Assembly, Illustrated Parts Breakdown, Manual Figure 8-19 (1 of 2) (for Change C)

7-6

TM 11-6625-2866-14&P

Model 8444A Manual Changes

7-6. MANUAL CHANGE SUPPLEMENT

This supplement contains important information for adapting the manual to instruments containing improvements made

after the printing of the manual.

To use this supplement:

Make all appropriate serial number related changes indicated in the tables below.

Serial Prefix or Number Make Manual Changes Serial Prefix or Number Make Manual

Changes

1601A, 1630A 1

CHANGE 1

Page 6-6, Table 6-2:

Change A8 HP Part Number to 0960-0444.

Page 6-7, Table 6-2:

Change SI HP Part Number to 3101-1395.

Page 8-19, Figure 8-17, Service Sheet 5:

Replace ON/OFF switch S1 and POWER LINE MODULE A8, wiring diagram and schematic, with Figure 1 of this

MANUAL CHANGES.

7-7

TM 11-6625-2866-14&P

Model 8444A Service

SECTION VIII

SERVICE

8-1. INTRODUCTION

8-2. This section provides instructions for trouble-

shooting and repair of the HP Model 8444A Tracking

Generator.

8-3. PRINCIPLES OF OPERATION

8-4. Information relative to the principles of

operation appears on the foldout pages opposing the

Block Diagram, Service Sheet 1. Theory of operation

appears on the foldout pages facing each of the foldout

schematic diagrams. The schematic diagram circuits

are referenced in the theory of operation test by block

numbers.

8-5. RECOMMENDED TEST EQUIPMENT

8-6. Test equipment and accessories required to

maintain the Tracking Generator are listed in Table 1-3.

If the equipment listed is not available, equipment that

meets the required specifications may be substituted.

8-7. TROUBLESHOOTING

8-8. Troubleshooting procedures are divided into two

maintenance levels in this manual. The first, a

troubleshooting tree, is designed to isolate the

malfunction to the defective circuit.

8-9. The second maintenance level provides circuit

analysis and test procedures to aid in isolating faults to a

defective component. Circuit descriptions and test

procedures for the second maintenance level are

located on the pages facing the schematic diagrams.

The test procedures are referenced to the schematic

diagrams by block numbers.

8-10. After the cause of a malfunction has been found

and remedied in any circuit containing adjustable

components, the applicable procedure specified in

Section V of this manual should be performed. After

repairs and/or adjustments have been made, the

applicable procedure specified in Section IV of this

manual should be performed.

8-11. REPAIR

8-12. Factory Repaired Exchange Modules. The

LSI microcircuit, Amplifier and ALC Detector Assy A3, is

available as a factory repaired exchange module. The

factory repaired module is available at a considerable

savings in cost over the new module.

8-13 This exchange module should be ordered from

the nearest Hewlett-Packard Sales and Service office

using the part number in the replaceable parts table in

Section VI of this manual. Virtually all orders for

replacement parts received by HP offices are shipped

the same day received --either from the local office or

from a Service Center.

8-14. Factory Selected Components. Some

component values are selected at the time of final

checkout at the factory. Usually these values are not

extremely critical; they are selected to provide optimum

compatibility with associated components. These

components, which are identified on the schematics with

an asterisk, are listed in Table 84. The recommended

procedure for replacing a factory-selected component is

as follows:

a. Try the original value, then perform the test

specified in Section. V of this manual for the circuit

being repaired.

b. If the specified test cannot be satisfactorily

performed, try the typical value shown in the parts list

and repeat the test.

c. If the test results are still not satisfactory,

substitute various values until the desired result is

obtained.

8-15. Adjustable Components. Adjustable

components, other than front panel operating controls,

are listed in Table 8-2 Adjustment procedures for these

components are contained in Section V of this manual.

8-16. Servicing Aids on Printed Circuit Boards.

Servicing aids on printed circuit boards include test

points, transistor designations, adjustment callouts and

assembly part numbers with alpha-numerical revision

information.

8-17. Part Location Aids. The location of chassis

mounted parts and major assemblies are shown in

Figures 8-4 and 8-5.

8-18. The location of individual components mounted

on printed circuit boards or assemblies are shown on the

appropriate Service Sheet. The part reference

designator is the assembly designation plus the part

designation. (Example: A1Rl is R1 on the Al

assembly.) For specific component description and

ordering information refer to the replaceable parts table

in Section VI.

8-1

TM 11-6625-2866-14&P

Model 8444A Service

Table 8- 1. Factory Selected Components

Designation Service Sheet Circuit Purpose

A2R8 3ALC Differential Amplifier Center GAIN ADJ control

A4AlR11 3PIN Diode Modulator Set range of Modulator

Table 8-2. Adjustable Components

Designation Circuit Purpose

R1 +20 volt circuit MANUAL SCAN control

R2 Oscillator driver TRACK ADJ control

R3 ALC reference driver LEVEL control

AlR14 +20 volt power supply Sets +20 volt supply level and reference

level to -10 volt supply.

A2R6 PIN diode driver Sets limiting level of PIN diode driver

A2R7 PIN diode driver Sets gain of differential amplifier in PIN

diode driver circuit.

A2R17 PIN diode driver Sets PIN diode driver circuit for null.

A2R26 1.55 GHz oscillator driver Set frequency tuning range of 1.55 GHz

oscillator.

A2R27 1.55 GHz oscillator driver Sets oscillator power level.

A2R40 ALC reference diode circuit -10 dBm adjustment for LEVEL control.

A2R41 ALC reference diode circuit 0 dBm adjustment for LEVEL control.

A5ADJ 1 First converter Adjusts center frequency of 1.55 GHz cavity.

A5ADJ 2/3 First converter Adjusts center frequency of 2.05 GHz cavities.

A7 ADJ 1 1.55 oscillator Adjusts center frequency of 1.55 GHz

oscillator cavity.

8-19. Diagram Notes. Table 8-3, Schematic Diagram

Notes, provides information relative to symbols and

values shown on schematic diagrams.

8-20. GENERAL SERVICE HINTS

8-21. The etched circuit boards used in Hewlett

Packard equipment are the plated-through type

consisting of metallic conductors bonded to both sides

of an insulating material. The circuit boards can be

either a single layer or multi-layer board. The metallic

conductors are extended through the component holes

or interconnect holes by a plating process. Soldering

can be performed on either side of the board with

equally good results. Table 8-4 lists recommended tools

and materials for use in

repairing etched circuit boards. Following are

recommendations and precautions pertinent to etched

circuit repair work.

a. Avoid unnecessary component substitution;

it can result in damage to the circuit board and/or

adjacent components.

b. Do not use a high power soldering iron on

etched circuit boards. Excessive heat may lift a

conductor or damage the board.

c. Use a suction device or wooden toothpick

to remove solder from component mounting holes.

8-2

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Model 8444A Service

Table 8-3. Schematic Diagram Notes

8-3

TM 11-6625-2866-14&P

Model 8444A Service

CAUTION

Do not use a sharp object such as an

an awl or twist drill for this purpose.

Sharp objects may damage the

plated-through conductor.

d. After soldering, remove excess flux from

the soldered areas and apply a protective coating to

prevent contamination and corrosion.

8-22. Component Replacement. The following

procedures are recommended when component

replacement is necessary:

a. Remove defective component from board.

b. If component was unsoldered, remove

solder from mounting holes with a suction device or a

wooden toothpick.

c. Shape leads of replacement component to

match mounting hole spacing.

d. Insert component leads into mounting holes

and position component as original was positioned. Do

not force leads into mounting holes: sharp lead ends

may damage the plated through conductor.

NOTE

Although not recommended when

both sides of the circuit board are

accessible, axial lead components

such as resistors and tubular

capacitors, can be replaced without

unsoldering. Clip leads near body of

defective component, remove

component and straighten leads left

in board. Wrap leads of replacement

component one turn around original

leads. Solder wrapped connection

and clip off excess lead.

8-23. GENERAL SERVICE INFORMATION

8-24. Transistors and diodes are used throughout the

RF Section in circuit configurations such as delay

circuits, trigger circuits, switches, oscillators and various

types of amplifiers. Basic transistor operation is shown

on the following pages.

8-25. Transistor In-Circuit Testing. The common

causes of transistor failure are internal short circuits and

open circuits. In transistor circuit testing, the most

important consideration is the transistor base-to-emitter

junction. The base emitter junction in a transistor is

comparable to the control grid-cathode

Table 8-4. Etched Circuit Soldering Equipment

8-4

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Model 8444A Service

cathode relationship in a vacuum tube. The base

emitter junction is essentially a solid-state diode; for the

transistor to conduct, this diode must be forward biased.

As with simple diodes, the forward-bias polarity is

determined by the materials forming the junction.

Transistor symbols on schematic diagrams reveal the

bias polarity required to forward-bias the base-emitter

junction. The B part of Figure shows transistor symbols

with the terminals labeled. The other two columns

compare the biasing required to cause conduction and

cutoff in NPN and PNP transistors. If the transistor

base-emitter junction is forward biased, the transistor

conducts. However, if the base-emitter junction is

reverse-biased, the transistor is cut off (open). The

voltage drop across a forward-biased, emitter base

junction varies with transistor collector current. For

example, a germanium transistor has a typical forward-

bias, base-emitter voltage of 0.2-0.3 volt when collector

current is 1-10 mA, and 0.4-0.5 volt when collector

current is 10-100 mA. In contrast, forward-bias voltage

for silicon transistor is about twice that for germanium

types; about 0.5-0.6 volt when collector current is low,

and about 0.8-0.9 volt when collector current is high.

8-26. Figure 8-1, Part A, shows simplified versions of

the three basic transistor circuits and gives the

characteristics of each. When examining a transistor

stage, first determine if the emitter-base junction is

biased for conduction (forward-biased) by measuring the

voltage difference between emitter and base. When

using an electronic voltmeter, do

not measure directly between emitter and base; there

may be sufficient loop current between the voltmeter

leads to damage the transistor. Instead, measure each

voltage separately with respect to a common point (e.g.,

chassis). If the emitter-base junction is forward-biased,

check for amplifier action by short-circuiting base to

emitter while observing collector voltage. The short

circuit eliminates base-emitter bias and should cause

the transistor to stop conducting (cut off). Collector

voltage should then change and approach the supply

voltage. Any difference is due to leakage current

through the transistor and, in general, the smaller this

current the better the transistor. If the collector voltage

does not change, the transistor has either an emitter-

collector short circuit or emitter base open circuit.

8-27. Transistor and Diode Markings. Figure 8-2

illustrates examples of diode and transistor marking

methods. In addition, the emitter lead for bipolar

transistors is identified on the printed circuit boards.

8-28. OPERATIONAL AMPLIFIERS

8-29 Operational amplifiers are used to provide such

functions as summing amplifiers, offset amplifiers,

buffers and power supplies. The particular function is

determined by the external circuit connections.

Equivalent circuit and logic diagrams for type 741

operational amplifiers are contained in Figure 8-3,

Circuit A is a non-inverting buffer amplifier with a gain of

1. Circuit B is a non

Figure 8-1. Transistor Operation

8-5

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Model 8444A Service

inverting amplifier with gain determined by the

resistance of R1 and R2. Circuit C is an inverting

amplifier with gain determined by R1 and R2, with the

input impedance determined by R2. Circuit D contains

the functional circuitry and pin connection information

along with an operational amplifier review.

Note

In Circuit D it is assumed that the

amplifier has high gain, low output

impedance and high input

impedance.

8-30. 0perational Amplifier Troubleshooting

Procedure. Measure and record the voltage level at

both the (inverting) terminal pin 2 and the +

(noninverting) terminal pin 3. The level should not differ

by more than m 10 mV. If the voltage level is not within

m 10 mV, check the external circuitry and components.

If the external circuitry (input signal, operating voltages,

feedback resistors) is normal, replace the operational

amplifier.

8-31. ELECTRICAL MAINTENANCE

8-32. Perform the electrical checks and adjustments

once every six months and after repair or component

replacement.

Figure 8-2. Examples of Diode and Transistor Marking Methods

8-6

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Model 8444A Service

Figure 8-3. Operational Amplifier Equivalent Circuit

8-7/8-8

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Figure 8-4. Major Assembly Locations (1 Figure 8-4. Major Assembly Locations Figure 8-5. Adjustment and Test Point

8-9

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Figure 8-6.Tracking Generator Spectrum Analyzer, Simplified Block Diagram

8-10

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Figure 8-7.Tracking Generator, Block diagram with Spectrum Analyzer Interconnections

8-11

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Figure 8-7A.Troubleshooting Tree

8-12

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Figure 8-8.Tracking Generator Troubleshooting Block Diagram

8-13

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Figure 8-9. Mixer Diode Forming

Dimensions in Inches

8-14

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Figure 8-12. First Converter Circuits, Schematic Diagram

Figure 8-10. Modulator/Oscillator Driver

Assy A2 Component Locations

Figure 8-11. Amplifier and Pin Diode

Modulator Assy A4A1 Component Locations

8-15

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Figure 8-13. J1 RF Output Connector, Exploded View

8-16

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Figure 8-14. A2 Modulator/Oscillator Driver Assy, Component Location

Figure 8-15. Second Converter Circuit, Schematic Diagram

8-17

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8-18

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Figure 8-16. A1 Power Supply Assy, Component Location Figure 8-17. Power Supply and Input Circuit, Schematic Diagram

8-19

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Figure 8-18. A5 First Converter Assembly, Illustrated Parts Breakdown (1 of 2)

Figure 8-18. A5 First Converter Assembly, Illustrated Parts Breakdown (2 of 2)

8-20

Figure 8-19. A7 1.55 GHz Oscillator Assembly, Illustrated Parts

Breakdown (2 of 2)

Figure 8-19. A7 1.55 GHz Oscillator Assembly, Illustrated Parts

Breakdown (1 of 2) 8-21

TM 11-6625-2866-14&P

Model 8444A Appendix A

APPENDIX A

SERVICE NOTE - P-0960-2038, P-5086-6025

HP MODEL 8444A TRACKING GENERATOR

Serials Prefixed 1147A and Below

REQUIRED MODIFICATION WHEN REPLACING A3

When replacing the A3 Amplifier Detector Assembly in the HP Model 8444A, serials prefixed 1147A and below, a capacitor C3, 3300 pF, HP Part No. 0160-

0155, is a required addition for proper instrument operation. The capacitor is electrically connected between the RF Diode Signal line and ground. For easiest

installation, connect the capacitor between connector pins XA2-1 and XA2-7. Pin 1 is located nearest the instrument front panel.

APPENDIX B

SERVICE NOTE - P-08444-60019

HP MODEL 8444A TRACKING GENERATOR

Serials Prefixed 1147A and Below

REPLACEMENT FOR A7 08444-60003

The HP Part No. 08444-60019 assembly is the

recommended replacement for the old 08444-60003 A7

assembly. Since the old and new A7 assemblies are not

directly interchangeable, minor modifications are

required when installing the new A7. The additional

parts required for the modification are:

(one each)

HP 0757-0438 5.11K, 1%, 1/8 W Resistor

HP 0757-0439 6.81K, 1%, 1/8 W Resistor

HP 0757-0465 1OOK, 1%, 1/8 W Resistor

HP 8150-0449 30" Red No. 24 AWG Wire

MODIFICATIONS

1. A7 hookup (refer to Figures 8-12 and 8-19):

a. Connect the wht-brn wire to new A7C4.

b. Add red wire; connect between +20V (XA1-

6) and A7C2.

c. Connect violet and wht-blk-violet wires to

A7C3.

2. Component changes:

a. Add R5, 5.11K, 0757-0438 between

connector pins XA2-10 and unused XA2-

12; then short pins XA2-12 and XA2-11 (-

10V) together.

b. Replace A2R29 with 100K, 0757-0465.

c. Replace A2R36 with 6.81K, 0757-0439.

CALIBRATION

To calibrate the new A7 assembly, follow the 1.55 GHz

Oscillator Power Level, Frequency Check and

Adjustment procedure, pages 5-3 to 5-5.

A/B-1/2

TM 11-6625-2866-14&P

Model 8444A Appendix C

APPENDIX C

SERVICE NOTE - 8444A-1

HP MODEL 8444A TRACKING GENERATOR

Serials Prefixed 1147A and Below

IMPROVED POWER SUPPLY STABILITY

The +20V power supply stability can be improved by changing A4A1C2 from 24 pF to 1000 pF, HP Part No. 0160-3456.

The new value eliminates any oscillation tendencies and is a recommended modification for all instruments with serials

listed above.

C-1/2

TM 11-6625-2866-14&P

Model 8444A Appendix D

APPENDIX D

MODEL 8444A TRACKING GENERATOR, OPTION 058

D-1. INTRODUCTION

D-2. This appendix explains the use of an 8444A Tracking Generator with an 8558B/180 Spectrum Analyzer system

when Option 058 circuitry is added to the 8444A. The Tracking Generator is designed to generate a CW tracking signal

for an 8555A/8552/140 Spectrum Analyzer system when operating in the range of 0.5 to 1300 MHz. With Option 058

circuits added, a 0.5 to 1300 MHz CW tracking signal can also be generated by an 8444A when it is coupled to an

8558B/180 Spectrum Analyzer system.

D-3. DESCRIPTION

D-4. To provide a tracking signal for an 8555A/8552/140 Spectrum Analyzer, an 8444A Tracking Generator must be

fed a 2.05 to 4.1 GHz tuned oscillator signal from the 8555A First LO, plus a 500 MHz signal from the 8555A Third LO.

When mixed with the internal 1.55 GHz oscillator in the 8444A, a 0.5 to 1300 MHz tracking signal output is produced.

D-5. To develop a 0.5 to 1300 MHz tracking signal for an 8558B/180 Spectrum Analyzer/Display system, a 2.05 to

3.55 GHz First LO is available from the 8558B, but no 500 MHz LO is used in this instrument. Option 058 consists of a

500 MHz oscillator for the 8444A. This 500 MHz signal is brought out on a separate BNC connector on the rear panel of

the 8444A, directly above the THIRD LO INPUT BNC connector. When the 8444A is used with an 8558B/180 Spectrum

Analyzer system, the two rear panel BNC connectors are interconnected with a short BNC cable. With the First LO from

the 8558/B plus its own 500 MHz LO signal, the 8444A can provide a 0.5 to 1300 MHz tracking signal for the 8558B

Spectrum Analyzer system.

D-6. MANUAL CHANGES TO INCORPORATE OPTION 058

D-7. Section I.

D-8. 8444A System Specifications with Option 058 added are listed in Table D-1.

Table D-1. 8444A System Specifications with Option 058

SPECIFICATIONS

These specifications apply to the 8444A Option 058 when used with the 8558B Spectrum Analyzer ONLY. Specifications

of the 8444A Option 058 when used with the 8554B and 8555A Spectrum Analyzers can be found in Table 1-1 of the

8444A manual.

Swept Frequency Response Measurements Absolute Amplitude Calibration Range

Dynamic Range: <90 dB from Spectrum Analyzer 1 dB Spectrum Analyzer:

gain compression point to average noise level (approxi-

mately --10 dBm to -100 dBm). Log: From -117 dBm to +30 dBm, 10 dB/div on a

70 dB display or 1 dB/div on an 8 dB display.

Average Noise Level: -107 dBm with 10 kHz Resolution Linear: From 2.2 µV (-100 dBm) to 7.1V (+30

bandwidth. dBm), full scale in 10 dB steps.

D-1

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Model 8444A Appendix D

Table D-1. (Continued)

Frequency Range: 500 kHz to 1300 MHz

Scan Width: (Determined by Spectrum Analyzer Controls):

Per Division:14 Calibrated Scan Widths from a

5 kHz/div to 100 MHz/div in a 2, 5, 10 sequence.

"O” Scan: Analyzer is a fixed tuned receiver.

Frequency Resolution: 3 kHz.

Stability:

Residual FM (peak-to-peak): 1 kHz for time <0.1

sec.

Amplitude Accuracy:

System Frequency Response: +1.50 dB (0.5 dB

for 8444A-058, +10 dB for 8558B).

SWEEP/CW GENERATOR

Frequency: Controlled by Spectrum Analyzer. Range

500 kHz to 1300 MHz. Scan widths are determined

by Spectrum Analyzer controls.

Frequency Accuracy: Same as the 8558B. Can be improved

using an external counter.

Flatness: +0.5 dB.

Spectral Purity:

Residual FM (peak-to-peak): 1 kHz for time <0.1

sec. Harmonic Distortion:25 dB below output

level/(typical).

Nonharmonic (spurious) Signals: 35 dB below

output level.

Long Term Stability: Drift typically less than 30 kHz/10 min.

(20 kHz for 8558B, 10 kHz for 8444A) when

stabilized after 2-hour warm-up

Sweep Width: 50 kHz to 1000 MHz.

Sweep Rates: Selected by Sweep Time per Division on

Spectrum Analyzer. 16 internal scan rates from 0.1 m

Sec/div to 10 sec/div in a 1, 2, 5 sequence. Manual

Sweep is available with a front panel control of the

8558B. Auto Sweep is automatically controlled by

FREQ SPAN/DIV, RESOLUTION BW, and VIDEO

FILTER settings

PRECISION FREQUENCY MEASUREMENTS

An external counter output is provided on the 8444A for

precision frequency measurements. The frequency of

unknown signals as well as the frequency of any point on a

frequency response curve can be measured. The use of the

5300A/5303A Counter is suggested for frequency

measurements to 500 MHz and the 5245L/5254C Counter for

measurements to 1300 MHz

Frequency Accuracy (Tracking Generator Output): For

unknown signals, typically less than +3 kHz frequency

error after tracking adjustment with 10 kHz BW (Tracking

drift typically 10 kHz/10 min. after 2-hour warmup.)

For points on frequency response curve, counter accuracy +

Residual FM (1 kHz peak-to-peak for time <0.1 sec)

Counter Mode of Operation:

Manual Scan: Scan determined by front panel

control of 8558B

"O" Scan: Analyzer is a fixed-tuned receiver.

Counter reads center frequency to accuracy of

tracking drift

Counter Output Level: Nominally 0.1 Vrms

NOTE

All above changes in specifications

apply to use with an 8558B only

D-9. SECTION III OPERATION

D-10. Add the following 8444A Option 058 Tracking Generator Operation information when using the 8558B Spectrum

Analyzer.

1. Check that the 115/230V switch is set to correspond with the available line voltage. Refer to Figure 3-2,

steps 4 through 8, for switch and fuse information.

2. Apply power to Tracking Generator and Spectrum Analyzer.

3. Turn Spectrum Analyzer INTENSITY control fully CCW.

4. Allow instruments to warm up for at least 30 minutes.

5. Perform Spectrum Analyzer "Operation Check." Refer to 8558B Spectrum Analyzer Operating Manual.

D-2

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Model 8444A Appendix D

6. Set Spectrum Analyzer LOG/LINEAR control to LOG, and BANDWIDTH to 300 kHz.

7. Set OPTIMUM INPUT dBm to 0, and REF LEVEL dBm to 0 dBm.

8. Make the following interconnections between tracking Generator and Spectrum Analyzer.

a. 8558B FIRST LO OUTPUT to 8444A FIRST LO INPUT.

b. 8558B RF OUTPUT to the 8444A RF INPUT.

c. Jumper 500 MHz OUTPUT to THIRD LO INPUT (Rear Panel 8444A-058).

9. Check that the Spectrum Analyzer controls are set as follows:

INTENSITY ............................................................12 o'clock (approx.)

FREQUENCY MHz................................................................... 30 MHz

RESOLUTION BW ...................................................................300 kHz

FREQ SPAN/DIV....................................................................... 50 kHz

BASE LINE CLIPPER...................................................................CCW

SWEEP TIME/DIV................................................... 5 MILLISECONDS

dB/DIV-LIN ........................................................................... 10 dB/DIV

OPTIMUM INPUT dBm ...................................................................... 0

REF LEVEL dBm......................................................................... 0dBm

REF LEVEL FINE............................................................................... 0

VIDEO FILTER........................................................................2 o'clock

SWEEP TRIGGER........................................................................LINE

10. Set Tracking Generator LEVEL control to 0 dBm and adjust TRACK ADJ for maximum signal amplitude

indication on CRT display.

11. Adjust Spectrum Analyzer REF LEVEL FINE control or Tracking Generator LEVEL control to position signal

on CRT LOG REF level graticule line. (System calibrated at 30 MHz with an amplitude accuracy of +0.5

dB.)

12. Set Spectrum Analyzer to scan desired frequency range.

13. Insert device to be tested between Tracking Generator RF OUTPUT and Spectrum Analyzer RF INPUT.

14. Set Spectrum Analyzer Sweep Time to MAN.

15. Rotate Spectrum Analyzer MANUAL SWEEP control clockwise to tune system through selected frequency

range.

16. For automatic scanning, set SCAN MODE switch to INT and SWEEP TIME/DIV to desired scan time.

D-11. SECTION IV, PERFORMANCE TESTS

D-12. Add the following: Proper operation of the SPECIAL 500 MHz Oscillator after a one-hour warmn-up may be

checked in the following manner:

1. Connect the 500 MHz OUTPUT (Third LO OUTPUT, Figure D-2) on the rear panel of the 8444A to a 432A

Power Meter.

2. Adjust "L.O. PWR" on Oscillator Assembly (A9) to set oscillator output power to +4 dBm + .5 dB.

3. Disconnect oscillator output from power meter and connect to 5254C Frequency Counter.

4. Adjust "FREQ ADJ" on Oscillator to set frequency to 500 MHz + 200 kHz.

D-3

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Model 8444A Appendix D

5. Check power output again and re-adjust if necessary.

6. Repeat steps 2 through 5 until the two test limits are both met.

D-13. SECTION VI, REPLACEABLE PARTS

Page 6-4, Table 6-2:

Add the following parts:

Table D-2. Replaceable Parts

Reference HP Part Mfr

Designation Number Qty Description Code Mfr Part Number

A9 0844460024 1 500 MHz OSCILLATOR ASSEMBLY 28480 08444-60024

A9C1 01602357 2 C;FXD 100OPF +80 -20% 500WVDC CER 28480 0160-2357

A9C2 0160-2357 C;FXD 10OO0PF +80 -20% 500WVDC CER 28480 0160-2357

A9J1 1250-0828 1CONNECTOR: 50 OHM 28480 1250-0828

A9L1 0855400015 1 COUPLING: LO OUTPUT 28480 08554-00015

A9R1 06987200 1 R;FXD 31.6 OHM 2%.05W 24546 C3-1/8-TOO-31 R6-G

A9A1 0844460020 1 OSCILLATOR ASSEMBLY: 500 MHz 28480 08444-60020

A9AIC1 0160-2247 1C:FXD 3.9PF f.25PF 50OWVDC CER 28480 0160-2247

A9A1C2 0121-0414 1C:VAR TRMR 1.9 - 8.5PF; AIR 74970 189-253-5 MODIFIED

A9A1L1 0855400007 1 INDUCTOR: 500 MHz OSC. 28480 08554-00007

A9A1Q1 1854-0323 2TRANSISTOR: NPN 28480 1854-0323

A9A1Q2 1854-0323 TRANSISTOR: NPN 28480 1854-0323

A9A1R1 06983447 1 R: FXD 422 OHM 1% 1/8W 16299 C4-1/8-TO-422R-F

A9A1R2 0757-0280 2R: FXD 1K OHM 1% 1/8W 24546 C4-1/8-TO-1001-F

A9A1R3 0757-0280 R: FXD 1K OHM 1% 1/8W 24546 C4-1/8-TO-1001-F

A9A2 0844460031 1 POWER SUPPLY FILTER ASSEMBLY 28480 08444-60031

A9A2C1 0160-2055 2C: FXD.01 U F +80 -20% 10WVDC CER 28480 0160-2055

A9A2C2 0160-2055 C: FXD .O1U F +80 -20% 1OOWVDC CER 28480 0160-2055

A9A2C3 0180-00492 C: FXD 20UF +75 -10% 50WV DC AL 56289 300206G050CC2

A9A2C4 01800049 C: FXD 20UF +75 -10% 50WVDC AL 56289 300206G050CC2

A9A2CR1 1901-00402 DIODE: SWITCHING 2NS 30V 50MA 28480 1901-0040

A9A2CR2 1901-0040 DIODE: SWITCHING 2NS 30V 50MA 28480 1901-0040

A9A2Q1 185404042 TRANSISTOR: NPN 28480 1854-0404

A9A2Q2 1854-0404 TRANSISTOR: NPN 28480 1854-0404

A9A2R1 2100-1775 1R:VAR 5K OHM 5% WW 28480 2100-1775

A9A2R2 06983155 2 R:FXD 4.64K OHM 1% 1/8W 16299 C4-1/8TO-4641-F

A9A2R3 06983155 R: FXD 4.64K OHM 1% 1/8% 16299 C4-1/8-TO-4641-F

A9A2R4 06980083 1 R: FXD 1.96K OHM 1% 1/8W 16299 C4-1/8-TO-1961-F

A9A2R5 06980082 1 R: FXD 464 OHM 1% 1/8W 16299 C4-1/8-TO-4640-F

W19 08444-60025 1CABLE: COAX; 500 MHz OUTPUT 28480 0844460025

D-4

TM 11-6625-2866-14&P

Model 8444A Appendix D

D-14. SECTION VIII, SERVICE

D-15. Description of Option 058: A two-transistor, 500-MHz fixed-tuned local oscillator with power supply processing

circuits, Assembly A9, is added to the Main Deck of an 8444A. The 500 MHz LO Output is brought out through a BNC

connector on the rear panel directly above the BNC connector serving as the output of the THIRD LO INPUT. Power

supply voltages for the A9 500 MHz Oscillator Assembly are taken from the PC connector XA1 on the bottom of the

8444A Main Deck.

D-16. Figure D-1 is a top view of the 8444A including the Option 058 500 MHz A9 Oscillator Assembly with its BNC

connector on the rear panel.

D-17. Figure D-2 shows the rear panel of an 8444A Option 058 with the added 500 MHz OUTPUT BNC connector

above the THIRD LO INPUT connector.

D-18. Figure D-3 is a schematic diagram of the 500 MHz Oscillator used with Option 058, a capacitance multiplier used

as additional filter for the 8444A +20V power supply, and an adjustable current regulator for the -10V 8444A power

supply.

D-5

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Model 8444A Appendix D

Figure D-1. 500 MHz LO Mounting location and Output Port for the 8444A, Option 058

D-6

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Model 844A Appendix D

When using the 8444A with an 8558B/180 Spectrum Analyzer the 8444A 500 MHz OUTPUT and

its THRID LO INPUT must be interconnected with a short cable.

Figure D-2. Location of 500 MHz LO OUTPUT BNC Connector Added on Rear Panel of the 8444A, Option 058

D-7

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Model 844A Appendix D

Figure D-3. A9 500 MHz Oscillator Assembly Schematic

D-8

TM 11-6625-2886-14&P

APPENDIX E

REFERENCES

DA Pam 310-4 Index of Technical Manuals, Technical Bulletins, Supply Manuals (Types 7, 8, and 9),

Supply Bulletins, and Lubrication Orders.

DA Pam 310-7 US Army Equipment Index of Modification Work Orders.

TB 43-0118 Field Instructions for Painting and Preserving Electronics Command Equipment

Including Camouflage Pattern Painting of Electrical Equipment Shelters.

TM 38-750 The Army Maintenance Management System (TAMMS).

TM 750-244-2 Procedures for Destruction of Electronics Materiel to Prevent Enemy Use (Electronics

Command).

E-1

TM 11-6625-2866-14&P

APPENDIX F

COMPONENTS OF END ITEM LIST

Section I. INTRODUCTION

F-1. Scope

This appendix lists integral components of and basic

issue items for the SG-1 125/U to help you inventory

items required for safe and efficient operation.

F-2. General

This Components of End Item List is divided into the

following sections:

a. Section II. Integral Components of the End

Item. These items, when assembled, comprise the

SG1125/U and must accompany it whenever it is

transferred or turned in. The illustrations will help you

identify these items.

b. Section III Basic Issue Items. These are

the minimum essential items required to place the SG-

1125/U in operation, to operate it, and to perform

emergency repairs. Although shipped separately

packed they must accompany the SG-1125/U during

operation and whenever it is transferred between

accountable officers. The illustrations will assist you

with hard-to-identify items. This manual is your

authority to requisition replacement BII, based on

TOFEMTOE authorization of the end item.

F-3. Explanation of Columns

a. Illustration. This column is divided as

follows: (1) Figure number. Indicates the figure

number of the illustration on which the item is shown.

(2) Item number. The number used to

identify item called out in the illustration.

b. National Stock Number. Indicates the

National stock number assigned to the item and which

will be used for requisitioning

c. Description. Indicates the Federal item

name and, if required, a minimum description to identify

the item. The part number indicates the primary

number used by the manufacturer, which controls the

design and characteristics of the item by means of its

engineering drawings, specifications, standards, and

inspection requirements to identify an item or range of

items. Following the part number, the Federal Supply

Code for Manufactures (SCM) is shown in parentheses.

d. Location. The physical location of each

item listed is given in this column. The lists are

designed to inventory all items in one area of the major

item before moving on to an adjacent area.

e. Usable on Code. Not applicable.

f. Quantity Required (Qty Reqd). This

column lists the quantity of each item required for a

complete major item.

g. Quantity. This column is left blank for use

during an inventory. Under the Rcvd column, list the

quantity you actually receive on your major item. The

Date columns are for your use when you inventory the

major item.

(Next printed page F-2)

F-1

TM 11-6625-2866-14&P

SECTION II INTEGRAL COMPONENTS OF END ITEM

(1) (2) (3) (4) (5) (6) (7)

ILLUSTRATION NATIONAL DESCRIPTION LOCATION USUABLE QTY QUANTITY

(A) (B) STOCK ON REQD

FIG. ITEM NUMBER PART NUMBER CAGE CODE RCVD DATE

6625-00-185-4802 GENERATOR, TRACKING

SG-1125/U (HP 8444A)

Change 1 F-2

TM 11-6625-2866-14&P

SECTION III BASIC ISSUE ITEMS GENERATOR TRACKING SG-1125/U

(1) (2) (3) (4) (5) (6) (7)

ILLUSTRATION NATIONAL DESCRIPTION LOCATION USUABLE QTY QUANTITY

(A) (B) STOCK ON REQD

FIG. ITEM NUMBER PART NUMBER CAGE CODE RCVD DATE

AC POWER CABLE

8120-1348

RACK MOUNTING KIT

5060-8739

INTERCONNECT CABLE

08444-60017

INTERCONNECT CABLES (3)

08444-60018

OPERATING AND SERVICE MANUAL

08444-90012

Change 1 F-3/(F-4 blank)

TM 11-6625-2866-14&P

APPENDIX G

ADDITIONAL AUTHORIZATION LIST

Section I. INTRODUCTION

G-1. Scope

This appendix lists additional items you are authorized

for the support of the SG-1 125/U.

G-2. General

This list identifies items that do not have to accompany

the SG1125/U and that do not have to be turned in with

it. These items are all authorized to you by CIA, MTOE,

TDA, or JTA.

G-3. Explanation of Listing

National stock numbers, descriptions, and quantities are

provided to help you identify and request the additional

items you require to support this equipment. The items

are listed in alphabetical sequence by item name under

the type document i.e., CTA, MTOE, TDA, or ITA) which

authorizes the item(s) to you.

(Next printed page is G-2)

G-1

TM 11-6625-2866-14&P

SECTION II ADDITIONAL AUTHORIZATION LIST

(1) (2) (3) (4)

NATIONAL DESCRIPTION UNIT QTY

STOCK OF AUTH

NUMBER MEAS

USABLE ON

PART NUMBER AND FSCM CODE

JOINING BRACKET KIT HP 5060-8543

ACCESSORY POWER CORD

HP 8120-1575

ACCESSORY POWER CORD

HP 8120-1576

Change 1 G-2

TM 11-6825-2866-14&P

APPENDIX H

MAINTENANCE ALLOCATION

Section I. INTRODUCTION

H-1. General

This appendix provides a summary of the maintenance

operations for SG-1125/U. It authorizes categories of

maintenance for specific maintenance functions on

repairable items and components and the tools and

equipment required to perform each function. This

appendix may be used as an aid in planning

maintenance operations.

H-2. Maintenance Function

Maintenance functions will be limited to and defined as

follows: a. Inspect. To determine the serviceability of

an item by comparing its physical, mechanical, and/or

electrical characteristics with established standards

through examination.

b. Test. To verify serviceability and to detect

incipient failure by measuring the mechanical or

electrical characteristics of an item and comparing those

characteristics with prescribed standards.

c. Service. Operations required periodically to

keep an item in proper operating condition, i.e., to clean

(decontaminate), to preserve, to drain, to paint, or to

replenish fuel, lubricants, hydraulic fluids, or

compressed air supplies.

d. Adjust. To maintain, within prescribed limits,

by bringing into proper or exact position, or by setting

the operating characteristics to the specified

parameters.

e. Align. To adjust specified variable elements

of an item to bring about optimum or desired

performance.

f. Calibrate. To determine and cause

corrections to be made or to be adjusted on instruments

or test measuring and diagnostic equipments used in

precision measurement. Consists of comparisons of two

instruments, one of which is a certified standard of

known accuracy, to detect and adjust any discrepancy in

the accuracy of the instrument being compared.

g. Install. The act of emplacing, seating, or

fixing into position an item, part, module (component or

assembly) in a manner to allow the proper functioning of

the equipment or system.

h. Replace. The act of substituting a

serviceable like type part, subassembly, or module

(component or assembly) for an unserviceable

counterpart.

i. Repair. The application of maintenance

services (inspect, test, service, adjust, align, calibrate,

replace) or other maintenance actions (welding,

grinding, riveting, straightening, facing, remaching, or

resurfacing) to restore serviceability to an item by

correcting specific damage, fault, malfunction, or failure

in a part, subassembly, module (component or

assembly), end item, or system.

j. Overhaul. That maintenance effort

(service/action) necessary to restore an item to a

completely serviceable/operations condition as

prescribed by maintenance standards (i.e., DMWR) in

appropriate technical publications. Overhaul is normally

the highest degree of maintenance performed by the

Army. Overhaul does not normally return an item to like

new condition.

k. Rebuild. Consists of those services/actions

necessary for the restoration of unserviceable

equipment to a like new condition in accordance with

original manufacturing standards. Rebuild is the highest

degree of materiel maintenance applied to Army

equipment. The rebuild operation includes the act of

returning to zero those age measurements (hours,

miles, etc.) considered in classifying Army

equipments/components.

H-3. Column Entries

a. Column 1, Group Number. Column 1 lists

group numbers, the purpose of which is to identify

components, assemblies, subassemblies, and modules

with the next higher assembly.

b. Column 2, Component/Assembly. Column 2

contains the noun names of components, assemblies,

subassemblies, and modules for which maintenance is

authorized.

c. Column 3, Maintenance Functions. Column

3 lists the functions to be performed on the item listed in

column 2. When items are listed without maintenance

functions, it is solely for purpose of having the group

numbers in the MAC and RPSTL coincide.

d. Column 4, Maintenance Category. Column

4 specifies, by the listing of a "work time" figure in the

appropriate subcolumn(s), the lowest level of

maintenance authorized to perform the function listed in

column 3. This figure represents the active time

required to perform that maintenance function at the

indicated category of maintenance. If the number or

complexity of the tasks within the listed maintenance

function vary at different maintenance categories,

appropriate "work time" figures will be shown for each

category. The number of taskhours specified by the

"work time" figure represents the average time required

to restore an item (assembly, subassembly, component,

module, end item or system) to a serviceable condition

under typical field operating conditions. This time

includes preparation time, troubleshooting time, and

quality assurance/quality control time in addition to the

time required to perform the specific tasks identified for

the maintenance functions authorized in the

maintenance allocation chart. Subcolumns of column 4

are as follows:

C -- Operator/Crew

O -- Organizational

F-- Direct Support

H-1

TM 11-6625-2866-14&P

H-General Support

D-Depot

e. Column 5, Tools and Equipment. Column 5

specifies by code, those common tool sets (not

individual tools) and special tools, test, and support

equipment required to perform the designated function.

f. Column 6, Remarks. Column 6 contains an

alphabetic code which leads to the remark in section IV,

Remarks, which is pertinent to the item opposite the

particular code.

H-4. Tool and Test Equipment Requirements

(Sec III)

a. Tool or Test Equipment Reference Code.

The numbers in this column coincide with the numbers

used in the tools and equipment column of the MAC.

The numbers indicate the applicable tool or test

equipment for the maintenance functions.

b. Maintenance Category. The codes in this

column indicate the maintenance category allocated the

tool or test equipment.

c. Nomenclature. This column lists the noun

name and nomenclature of the tools and test equipment

required to perform the maintenance functions.

d. National/NATO Stock Number. This column

lists the National/NATO stock number of the specific

tool or test equipment.

e. Tool Number. This column lists the

manufacturer's part number of the tool followed by the

Federal Supply Code for manufacturers (5-digit) in

parentheses.

H-5. Remarks (Sec IV)

a. Reference Code. This code refers to the

appropriate item in section II, column 6.

b. Remarks. This column provides the required

explanatory information necessary to clarify items

appearing in section II.

(Next printed page is H-3)

H-2

TM 11-6625-2866-14&P

SECTION II. TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

GENERATOR TRACKING SG-1125/U

(1) (2) (3) (4) (5) (6)

GROUP MAINTENANCE MAINTENANCE CATEGORY TOOLS AND

NUMBER COMPONENT ASSEMBLY FUNCTION COFH D EQUIPMENT REMARKS

00 GENERATOR TRACKING SG-1125/U Inspect 0.2 A

Test 3.0 1 thru 17

Adjust 1.5 1 thru 13,

17 thru 21

Repair 1.0 2.0 1 thru 13,

17 thru 21

Overhaul 3.0 1 thru 21

01 POWER SUPPLY BOARD ASSEMBLY A2 Inspect 0.2

Test 1.0 10,11,17,

Adjust 0.2 20, 21

Replace 0.5 20, 21

Repair 0.5 20, 21

Overhaul 0.1 20, 21

02 DRIVER BOARD ASSEMBLY A2 Inspect 0.2

Test 1 thru 3,

8 thru 13

Adjust 0.5 20, 21

Replace 0.5 20, 21

Repair 1.0 20, 21

overhaul 1.5 20, 21

03 AMPLIFIER AND DETECTOR ASSEMBLY Test 0.5 1 thru 3,

A3 17

Replace 0.5 20, 21

04 AMPLIFIER ASSEMBLY A4 Inspect 0.3

Test 0.5 1 thru 3,

8 thru 12

Replace 0.5 20, 21

Repair 1.0 20, 21

Overhaul 1.0 20, 21

05 FIRST CONVERTER ASSEMBLY A5 Inspect 0.1

Test 1.0 1 thru 3,

8 thru 12

Adjust 0.5 20, 21

Replace 0.5 20, 21

0501 FIRST MIXER ASSEMBLY A5A1 Repair 0.5 20, 21 B

Replace 0.5 20, 21

06 SECOND CONVERTER ASSEMBLY A6 Inspect 0.2

Test 0.5 1 thru 3

8 thru 12

0.5 20, 21

07 OSCILLATOR ASSEMBLY A7 Inspect 0.2

Adjust 0.5 20, 21

Replace 0.5 20, 2

Change 1 H-3

TM 11-6625-2866-14&P

SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

GENERATOR TRACKING SG-1125/U

(1) (2 ) (3) (4) (5)

TOOL OR TEST

EQUIPMENT MAINTENANCE NATIONAL/NATO TOOL

REF CODE LEVEL NOMENCLATURE STOCK NUMBER NUMBER

1H, D ANALYZER SPECTRUM IP-1216(P)/GR 6625-00-424-4370

2H, D PLUG-IN UNIT SPECTRUM ANALYZER 6625-00-140-0156

PL-1406/U

3H, D PLUG-IN UNIT ELECTRONIC TEST 6625-00-431-9339

EQUIPMENT PL-1388/U

4H, D GENERATOR SIGNAL SG-1129/U 6625-00-937-3525

5H, D ANALYZER SPECTRUM IP-1216(P)/GR 6625-00-424-4370

6H, D PLUG-IN UNIT ELECTRONIC TEST 6625-00-432-5055

EQUIPMENT PL-1399/U

7H, D PLUG-IN UNIT ELECTRONIC TEST 6625-00-431-9339

EQUIPMENT PL-1388/U

8H, D POWER METER, HEWLETT PACKARD 436A 6625-01-033-5050

9H, D POWER SENSOR, HEWLETT 6625-01-015-4412

PACKARD 8482A

10 H, D VOLTMETER IS-185 6625-00-405-6608

11 H, D MULTIMETER, ME-303A/U 6625-00-969-4105

12 H, D COUNTER ELECTRONIC TD-1225(V)1/U 6625-00-498-8946

13 H, D GENERATOR SIGNAL AN/USM-205A 6625-01-007-4796

14 H, D GENERATOR SIGNAL AN/GRM-SOC 6625-00-003-3238

15 H, D GENERATOR SIGNAL AN/USM-44B 6625-00-126-5708

16 H, D GENERATOR SIGNAL SG-340A/G 6625-00-542-1292

17 H, D VOLTMETER DIGITAL AN/GSM-64B 6625-00-022-7894

18 H, D TRANSFORMER, VARIABLE 5950-00-235-2086

POWER CN-16/U

19 H, D POWER SUPPLY, DUAL DC- HP 6205B 6625-00-437-4861

20 H, D TOOL KIT TK-1OO/G 5180-00-605-0079

21 H, 0 COMMON TOOLS NECESSARY TO THE PERFORMANCE OF THIS MAINTENANCE

FUNCTION ARE AVAILABLE TO MAINTENANCE PERSONNEL FOR THE MAINTEN-

ANCE CATEGORY LISTED.

Change 1 H-4

TM 11-6625-2866-14&P

SECTION IV. REMARKS

GENERATOR TRACKING SG-1125/U

REFERENCE CODE REMARKS

AVISUAL

BREPAIR BY REPLACEMENT OF DIODE ASA1CR1

* U.S. GOVERNMENT PRINTING OFFICE: 1980-765-016/1104

H-5/(H-6 blank)

TM 11-6625-2866-14&P

APPENDIX I

REPAIR PARTS AND SPECIAL TOOLS LIST

Refer to Section VI, Replaceable Parts, for all maintenance parts.

I-1

PIN 044822-001

044822_1 HP 8444A Tracking Generator User Manual

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