Powerwave Technologies 5JS0028 User Manual 14820
Powerwave Technologies Inc 14820
8
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| Document ID | 14820 |
| Application ID | F5ZZGN77Tv2UWt1F32pFRQ== |
| Document Description | 8 |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 34.25kB (428167 bits) |
| Date Submitted | 1998-12-04 00:00:00 |
| Date Available | 1999-02-05 00:00:00 |
| Creation Date | 2001-07-09 20:52:47 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-07-09 20:52:58 |
| Document Title | 14820.pdf |
| Document Author: | VicodinES /CB /TNN |
A /\ A
anyERyyAya
TECHNOLOG‘ES
INSTALLATION & SERVlCE
MIANML
LDA9301 -30
30-WATT
LINEAR DISCREET AMPLIFlER
935-940 MHz
12 June 1998
Powerwave Technologies, Inc. Tel: 949-757-0530
2026 McGaw Avenue Fax: 949—757-0941
Irvine, CA 92614 Web Site: www.pwav.com
044-0504] Rev A
Par.
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2-2
2-3
2-4
4-1
4-3
44
4-5.1
4-5 2
4—5 3
4454
4—6
TABLE OF CONTENTS
Section 1 Page
General Description M
Introduction.
General Description .
Functional and Physical Specification
Equipment Changes . ,
Ordering information.
Section 2
Installation
introduction ...................
Electncai Service Recommendations
Unpacking and inspection
Installation Instructions
Section 3
Operating instructions
introduction. . .......
Location and Function of Amplifier Control and indicators. .
Initial Start- Up and Operating Procedures .....................
Section 4
Principles of Operation
Introduction .....
RF Input Signa
RF Output Load
Functional Descnp ion.
LDA9301-30 Amplifier.
Main Amplifier .......
Loop Control ..
Bypass Mode.
Amplifier Cooling . .
Power Distribution ..
ii44-050Ai Rcv A ii
5—2
5-3
5—4
5-5
5—51
5—6
5—6.l
5-62
5—63
G—l
6-2
631
6—32
TABLE OF CONTENTS (Continued)
Section 5
Maintenance
Introduction .....
Periodic Maintenance .
Test Equipment ReqUired for Test
Cleaning air lnlets/Outlets. a
Performance Test ......
Amplifier Performance Tee
Field Replaceable Parts,
LDA9301-30 Amplifier.
Cooling Fan H , .
Fuses ........
Section 6
Troubleshooting
Introduction .....................
Troubleshooting .......
Return for Service Procedure
Obtaining an RMA ........
Repackaging for Shipment. .
LIST OF ILLUSTRATIONS
LDA930‘I 30 Amplifier ...........
LDAQBOl- {30 Amplifier Rear View .
LDA9301- -30 Amplifier interconnect Diagram .
LDA9301- -30 Amplifier Block Diagram .........
Amplifier Test Setup Diagram . ........
LIST OF TABLES
Major Amplifier Components H
LDAQSOi—BD Amplifier Functional Specifications
Amplifier Control and Indicators l
Periodic Maintenance .v .
Test Equipment Required
Troubleshooting
044-050“ Rev; A iii
GENERAL DESCRIPTION
1-1‘ INTRODUCTION
This manual contains information and procedures for installation, operation, and maintenance of
Powerwave’s 30-watt LDA930‘l—30 Linear Discrete Amplifier. The manual is organized into six
sections as follows.
Section 1. General Description
Section 2. installation
Section 3, Operating instructions
Section 4, Principles of Operation
Section 5. Maintenance
Section 6 Troubleshooting
1-2. GENERAL DESCRIPTION
The LDA9301—30 is a single channel linear discrete power amplifier that operates from 935 to 940
MHz, The amplifier is modular in design, and is ideally suited for use in RAM-Mobitex base
stations, The LDA9301-30 provides 30 watts of RF power, a iZ-volt auxiliary output connection,
and a tail-safe bypass mode The amplifier consists of a DC power supply, a microprocessor
control circuit, and a single stage of amplification to provide a gain minimum of 10 dB The
microprocessor control circuit controls all faii»safe bypass modes that proVide protection in the
event of an RF overpower input/output, an over-temperature, or loss ofAC power.
1—3. FUNCTIONAL AND PHYSICAL SPECIFICATIONS
Functional and physical specifications for the LDA9301-30 amplifier are listed in table 1-2.
1—4. EQUIPMENT CHANGES
Powerwave Technologies, Inc reserves the right to make minor changes to the equipment without
notice, including but not necessarily limited to component substitution and circuitry changes,
Such changes may or may not be incorporated in this manual, although it is our intention to keep
each manual as up-to—daie as possible To that end. we ask that you, our customer, share with
us information acquired in field Situations which might be of assistance to another user. if you
share it with us, we'll pass it around
044-0504] Rev r‘\ M
1-5. ORDERING INFORMATION
Table 14 following gives the part numbers and descriptions to be used when ordering either an
entire amplifier or a replacement fan.
Table 1—1 Major Amplifier Components
MODEL NUMBER DESCRIPTlON
30-Watt Linear Discreet
LDA9301'30 Amplifier‘ 935-940 MHz
BOO-00838001 Fan Assem biy.
Table 142 LDA9301-30 Amplifier Functional Specifications
Frequency Range 935-940 MHz.
Gain 10 dB minimum at 30 watts output (44 8 dBm)
Gain vs. Frequency $0.25 dB
Second Harmonic <60 dBc
Operation Mode Single channel
Engages on overtemperature shutdown, loss
cfAC power, or loss of input power.
Modulation Format GMSK, CW
Norse Power Output —90 dBm
Output Power Range 20-448 dBrn
VSWR 511,822 <‘l.51
Operating Voltage 120 Vac, 47463 Hz
Current Draw 2.5 amps maximum
Operating Temperature Range 0 EC - +60 °C
Storage Temperature Range -40 “C » +85 “C
AuXiliary Output +12 Vdc t 0 25 V‘ 500 mA
Connectors
Bypass Mode
RF Type N Female mounted at rear of chassis
AC Male lEC 320 mounted at rear of chassis
DC (Auxiliary Output)‘ Radio Shack number 274-222
Cooling Fan with air intake at the front of the unit
LED Display POWER ON (green), AMP ON (green)
AC line: 3 A. 250 V AGO-3
DC Auxiliary: 1 A, 250 V. AGO—1
Width: 19 inches
Height: 5.22 inches
Depth. 12.38 inches (includes
Fuses
Dimensions (see figure 1-1)
handles)
“30-inch mating extension provided
(LN-05041 Rev A 1-2
INSTALLATION
fi
2-1. INTRODUCTION
This section contains installation recommendations unpacking, inspection, and installation
instructions for the LDA9301v30 amplifier. Carefully read all material in this section prior to
equipment unpacking or installation. Also read and reView the operating procedures in Section 3
prior to installing the equipment It is important that the licensee perform these tasks correctly and
in good faith, If applicable, carefully read Parts 73 and 74 of the Federal Communications
Commission (FCC) rules to determine how they apply to your installation DON‘T TAKE
CHANCES WITH YOUR LICENSE.
2-2. ELECTRICAL SERVICE RECOMMENDATIONS
Powenivave Technologies recommends that proper AC line conditioning and surge suppression
be provided on the primary AC input to the amplifier All electrical service should be installed In
accordance With the National Electrical Code, any applicable state or local codes, and good
engineering practice. Special consideration should be given to lightning protection of all systems
in View of the vulnerability of most transmitter sites to lightning. Lightning arrestors are
recommended in the service entrance. Straight, short ground runs are recommended. The
electrical service must be well grounded.
Each amplifier system should have its own circuit breaker, so a failure in one does not shut off the
whole installation Circuit breakers should be thermal type, capable of handling an inrush current
of 5 amps per amplifier, in a load center with a master switch
2-3. UNPACKING AND INSPECTION
This equipment has been operated, tested and calibrated at the factory. Only in the event of
severe shocks or other mistreatment should any substantial readlustment be requned. Carefully
open the containerls) and remove the amplifier modulels) Retain all packing material that can be
reassembled in the event that the unit must be returned to the factory,
CAUTION
Exercise care in handling equipment
during inspection to prevent damage
caused by rough or careless handling.
Visually inspect the amplifier module for damage that may have occurred during shipment Check
for eVidence of water damage, bent or warped chassis, loose screws or nuts, or extraneous
packing material in the connector or fans. Inspect the rear panel connector for bent connector
pins. If the equipment is damaged. 3 claim should be filed with the carrier once the extent of any
damage is assessed. We cannot stress too strongly the importance of IMMEDIATE careful
inspection of the equipment and the subsequent IMMEDIATE filing of the necessary claims
against the carrier if necessary. If possible, inspect the equipment in the presence of the delivery
person It the equipment is damaged. the carrier is your first area of recourse. If the equipment is
damaged and must be returned to the factory, write or phone for a return authorization.
Powerwave may not accept returns Without a return authorization. Claims for loss or damage may
not be Withheld from any payment to Powerwave, nor may any payment due be withheld pending
the outcome thereof WE CANNOT GUARANTEE THE FREIGHT CARRIER'S PERFORMANCE.
044705041 Rev A 2-1
2-4. INSTALLATION INSTRUCTIONS (Refer to figures 1-1 and 2-1)
The LDA9301»30 amplifier is designed for installation in a rack or cabinet that permits access from
the rear for connection of AC power, RF. and auxiliary 12 Vdc cables and for fuse replacement.
To install the amplifier proceed as follows:
2.
insert amplifier in equipment rack or cabinet and secure in place with four screws.
Connect 50-ohm antenna cable to RF OUTPUT connector on rear of amplifier.
Connect the transceiver/exciter output to RF INPUT connector on rear of amplifier.
Connect 30»lnch 12 Vdc cable to 12VDC connector on rear of amplifier, if it is to be used.
WARNING
Verify that the LINE switch on the front of the amplifier is in the
off (0) position before applying AC power to the amplifier.
Perform step 5 (followmg) before connecting the AC l‘ine cord to
the power source.
Connect AC line cable to power connector J1 on rear of amplifier
Check your work before applying AC voltage to the system. Make cenain all connectlons are
tight and correct, and that the front panel on/oft switch is in the off (0) position.
The AC line cord may now be plugged into the AC power outlet.
Refer to section 3 for initial turn-on and checkout procedures.
“44mm Rev A 22
044-0504] Rev A
2—3
PRINCIPLES OF OPERATION
—_.__—__—_—
______—__——
4-1. INTRODUCTION
This section contains a functional description of the LDA9301-30 Amplifier.
4-2. RF INPUT SIGNAL
The LDA9301-30 amplifier has a power amplifier module that provides a minimum of 10 dB of
gain. A microprocessor uses detector circuitry to detect RF power and provide bypass mode
protection in the event of an RF input/output overpower situationi an overtemperature situation.
the loss of AC power, or an amplifier module failure Input VSWR to the LDA9301-30 should not
exceed 2 1 for best performance
4-3. RF OUTPUT LOAD
The load impedance should be as good as possible (2:1 or better) In the working band for good
power transfer to the load
4—4t FUNCTIONAL DESCRIPTION
The LDA9301-30 amplifier (see interconnect diagram figure 4—1 and block diagram figure 4-2) is a
linear, single channel amplifier that operates in the frequency band from 935 MHz to 940 MHz.
The amplifier spemficalions are listed in table 1~2. Each amplifier is self-contained and is
functionally independent of other amplifiers The amplifier is designed to achieve high peak power
output and for redundancy in unmanned remote locations, Each amplifier in the system can
simultaneously transmit carrier frequencies at an average total power output of 30 watts.
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044-0504] Rev A
4-5. LDA9301-30 AMPLIFIER
The amplifier has an output of 30 watts power with 2nd harmonics suppressed to better than —60
dBc below carrier level The amplifier is comprised of:
Microprocessor board/alarm monitoring
One gain stage
Display LEDs
Power Supply
4-5.1. MAIN AMPLIFIER
The input and output of the amplifier utilizes a single—stage, class AB amplifier module which
provtdes approxunately 10 dB of gain in the 5 MHz frequency band from 935 MHz to 940 MHz.
The module contains two fail»safe SPDT relays that operate such as to prowde the amplification
mode and the bypass mode. A driver circuit operates the two relays. The amplifier module
operates on +27 Vdc, and a bias voltage of +5 Vdc. and is mounted directly on a heat sink. The
alarm logic controls the +5 Vdc bias voltage which shuts down or turns on the main amplifier. A
TTL signal controls the relay driver circuit
4-52. LOOP CONTROL
The loop control circuitry consists of a microprocessor (see paragraph 4-2), which monitors the
RF output power and prowdes the bypass mode protection in the event of an RF input/output
overpower situation, an overtempeiature situation, the loss of AC power. or an amplifier module
failure
The RF output power from the model LDA9301-30 amplifier is monitored by the microprocessor
A coupled detector monitors the final RF output level and generates a DC voltage (VFWD)
proportional to the RF output level. VFWD is fed back to the microprocessor The
microprocessor compares this voltage to a reference voltage and determines whether the main
amplifier is working properly or not The microprocessor also provides over-temperature
protection for the amplifier The RF module in the amplifier is mounted on a heatsink, The module
has a temperature—sensing IC mounted on it which constantly monitors heat and converts it to a
DC voltage. This voltage is sent to the microprocessor which shuts down the amplifier should the
temperature exceed the specified temperature range. When the amplifier has sufficiently cooled
down, the microprocessor re—enables the amplifier
4-53. BYPASS MODE
Immediately after the amplifier is turned on, the unit Will initialize in bypass mode for five seconds
to detect any fault. Subsequently, the bypass mode is engaged on an overtemperature shutdown,
loss of AC power, or loss of input power; the green AMP ON front panel LED Will go off, The unit
Will then attempt to restart approxrmately every 15 minutes after fault detection Cycling power will
restart the unit and, if successful, the green AMP ON front panel LED will come on, Power level
shutdown threshold is factory-set at 23 dBm with an internal adjustment capability of up to 43
dBm. Output power detection assumes that input power Will be present during all normal
operational modes, Loss of input power will result in loss of output power. causing the bypass to
engage.
4-5.4. AMPLIFIER COOLING
Although the amplifier module contains its own heat sink, it is cooled With forced air A fan,
located on the front of the amplifier and operating continuous duty from internally applied DC,
provides forced air cooling by drawing ambient air in through the front of the amplifier and
exhausting hot air out the rear of the amplifier. The fan is field replaceable.
04445041 Rev A 4-4
4-6. POWER DISTRIBUTION
Primary AC power(120 Vac 47—63 Hz) for the LDA9301-30 amphfier IS prowded by the host
system. The AC input is fused at three (3) amps. The umt has a buiIHn power supply that
prowdes an Internal power requwred. In addwtion, 12 Vdc is also provided anhe rear of the
amplifier at the 12VDC connector; it IS fused at one (1) amp
044~0504I Re» A 4-5
MAINTENANCE
5-1. INTRODUCTION
This section contains periodic maintenance and performance test procedures for the LDA9301-30
amplifier. It also contains a list of test equipment required to perform the identified tasks.
NOTE
Check your sales order and equnpment warranty
before attempting to service or repair the unit Do
not break the seals on equipment under warranty or
the warranty will be null and void, Do not return
equrpment for warranty or repair serVice until proper
shipping instructions are received from the factory
5-2. PERIODIC MAINTENANCE
Periodic maintenance requirements are listed in Table 5-1 Table 5-1 also lists the intervals at
which the tasks should be performed.
WARNING
Wear proper eye protection to avoid eye injury
when using compressed air.
Table 5-1 Periodic Maintenance
ACTION
INTERVAL
TASK
Cleaning
Air Vents 30 Days Inspect and clean per paragraph 5—4
Inspection
Cables and 12 Months Inspect signal and power cables for
frayed insulation, Check RF connectors
to be sure that they are light
Perform annual test per paragraph 5-5
Connectors
Performance Tests 12 Months
5-3. TEST EQUIPMENT REQUIRED FOR TEST
Test equipment required to test the amplifier system is listed In Table 5—2. Equivalent test
equipment may be substituted for any item.
NOTE
All RF test equipment must be calibrated to 0 05
dB resolution. Any deviation from the nominal
attenuation must be accounted for and factored
into all output readings
044415041 Ru A 5—1
Table 5-2, Test Equipment Required
NOMENCLATURE MANUFACTURER MODEL
Signal Generator HP. 86488
30 dB Attenuator, 150 Watt Narda
Low Pass Filter K&l. Microwave, Inc. HP3L 340-1100 — N/NP
Spectrum Analyzer H.P. 8562E
1 20 dB Directional Coupler HP
Power Meter / Sensor H P. 4378 / 6482A
Linear Discreet Amplifier.
40 dB Power Gain
Isolator
5—4. CLEANING AIR INLETSIOUTLETS
The air inlets and outlets should be cleaned every 30 days. It the equipment is operated in a
severe dust environment, they should be cleaned more often as necessary. Disconnect AC
power source before removing fans If dust and dirt are allowed to accumulate, the cooling
efficiency may be diminished. Using either compressed air or a brush with soft bristles, loosen
and remove accumulated dust and dirt from the air inlet panels
5-5. PERFORMANCE TEST
Performance testing should be conducted every 12 months to ensure that the amplifier system
meets the operational specifications listed in table 1-2, Also verify system performance after any
amplifier is replaced in the field. The test equipment required to perform the testing is listed In
table 5—2. and the test setup is shown in figure 5-1
NOTE
The frequencies used in this test are typical for an
amplifier With a band from 935 MHz to 940 MHz.
5—5.1. AMFLlFlER PERFORMANCE TEST.
This test is applicable to a subrack equipped with one to five plug-in LDA9301-30 amplifier
modules Perform the tests applicable to your system To perform the test, proceed as follows:
1 Connect test equipment as shown in figure 5-1
NOTE
Set the offset of the power meter properly,
2. Turn on signal generator and set frequency to 937.5 MHz.
3 Set input power to unit under test (UUT) at 32.0 (18m
4 Turn on 120 V AC.
GAlN TEST
5. Verify that power to the UUT is set for 32.0 dBrn,
6, Verify that the UUT delivers a minimum of 42.0 dBm
2'” HARMONIC TEST
7 With the power amplifier set at 30 watts (44.8 dB) power output, use the spectrum
analyzer and check the frequency band from 935 MHz to 940 MHZ for 2“ harmonic The
2’“ harmonic should be 450 dBc maximum,
044-0504! Rev A 5-2
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5-6. FIELD REPLACEABLE PARTS
The following parts can be replaced in the field on site by a qualified technician With experience
maintaining RF power amplifiers and similar equipment:
1, LDA9301-30 Amplifier
2. Cooling Fan
3. 1— and 3»Amp Fuses
5-631, LDA9301-30 AMPLIFIER
To replace an LDA9301 amplifier. proceed as follows:
Disconnect AC line cord from rear of amplifier
Disconnect RF INPUT and RF OUTPUT lines.
Disconnect 12VDC line it connected.
Loosen tour screws that secure amplifier module to rack or cabinet
ewwe
CAUTION
When removmg the amplifier from the subrack, it is very
important to support the amplifier such that the rear of the
module does not suddenly drop when the guide rail disengages
from the track. A drop such as this could damage the rear of the
amplifier.
2. Use the handles on the front of the module, and With a steady even pressure. pull the
module out of the rack or cabinet.
5-62. COOLING FAN
To replace the cooling fan, proceed as follows:
‘l. Verify that AC LINE switch is in the "O" posmon.
2. Pull out tour snap»fastener ptungers that secure fan to amplifier module Disconnect
fan power connector from amplifier module
3, Install replacement fan in reverse order of steps 1 and 2 above.
5-6.3. FUSES
The LDA9301-30 amplifier is equipped With two {uses both located on the rear panel, as follows:
120 Vac INPUT 12 Vdc OUTPUT
F1 F2
Manufacturer Bussman Bussman
Manufacturer's Number: AGO-3 AGO-1
Rating. 3 amps. 250 V 1 amp, 250 V
Size 1M inch diameter ‘ll4 inch diameter
1-114 inches long 14114 inches long
”44-050“ Rev A 5—4
TROUBLESHOOTING
6-1 INTRODUCTION
This section contains a list of problems which users have encountered and a few suggested
actions that may correct the problem, If the suggested corrective action does not eliminate the
problem. please contact your Powenlilave field representative or the factory for further Instructions.
NOTE
Check your sales order and equipment warranty
before attempting to service or repair the unit. Do
not break the seals on equipment under warranty or
the warranty will be null and void. Do not return
equipment for warranty or repair serVice until proper
shipping instructions are received from the factoiy.
6-2 TROUBLESHOOTING
Refer to table 6-1 for troubleshooting suggestions.
Table 6-1 Troubleshooting,
SUGGESTED ACTION
Verify that LINE switch is in the on (0) position
Check that power connection is secure
Check 3-arnp fuse Fl on rear of amplifier,
Check for proper AC line voltage.
Check that RF INPUT connector is properly attached.
Verify that RF input Signal is present
Verify that RF input power is in operational range.
If steps 1-3 are not effective. wait 15 minutes and repeat.
bypass mode may have been activated.
SYMPTOM
POWER ON indicator (green)
is not lit
AMP ON indicator (green) is
not lit
PP’thp’Nf‘
6-3 RETURN FOR SERVICE PROCEDURES
When returning products to Powerwave. the following procedures Will ensure optimum response.
6-3.1 Obtaining an RMA
A Return Material Authorization (RMA) number must be obtained prior to returning
equipment to the factory for service. Please contact our Customer Service Department at
(949) 757-0530 to obtain this number Failure to obtain this RMA number will result in
conSiderable delays in receiving repair service.
6-12 Repackaging for Shipment
To ensure safe shipment of the amplifier, it is recommended that the package designed
for the amplifier be used. The original packaging material is reusable. If it is not
available, contact Powerwave‘s Customer Service Department for packing materials and
information
“44-050“ Rcv A 6-1
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