Cubic Communications CTX-5000 CTX-5000 (5 KW) SOLID STATE TRANSMITTER User Manual PA 5050A

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Document Description	PA 5050A
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Date Submitted	1999-02-25 00:00:00
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TECHNICAL MANUAL
OPERATION AND MAINTENANCE INSTRUCTIONS
OPERATIONAL LEVEL
POWER AMPLIFIER, 1KW
MF - HF
PA-5050A
(FCC VERSION)
®
Cubvc Commumcilvans. Inc
9535 Waples SIIeeI
San Dwego. Calilovma 92I2|~2953
Teleuhune (SIS) 643-5300 Telelax' (619) 543-5803
Manual Pan Nc 2241~|DZ|~3
15 April 1998
©CUBIC¢ COMMUNICATIONS PA-5050A TECHNICAL MANUAL
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RECORD OF CHANGES
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FOREWORD
SCOPE
This manual contains infomation for the installer and operator to obtain best performance from the PA»5050A. The information
includes: a general description. preparation for use and installation instmctions, operating instructions, general theory of
operation, maintenance instructions, preparation for reshipment, and parts list.
Component level maintenance is not included in this manual, Component level maintenance should be performed in the
designated maintenance depot or the factory.
WARNING
Do not apply power to the equipment until the installation procedures in Chapter 2 have been successfully completed.
PROPRIETARY DATA
The information in this manual is the property ofCubic Communications Incorporated. Disclosure to a third party, either wholly
or in part, without written consent from Cubic Communications Incorporated is prohibited.
CORRECTION NOTICE
The information in this manual is believed correct at publication date. Ifa difference is noted between the information in this
manual and the equipment, contact the factory for clarification. Current and future editions will be corrected as necessary.
RIGHTS RESERVED
Cubic Communications Incorporated reserves the right to change the specifications. design. and fabrication methods of
equipment at any time without notice.
RIGHTS RESERVED
The PA-SOSDA when use With the PS-7130A and T—4150/80-9 comprises the CTX-1000 System, Th|s system is
FCC certified for aeronautical base station usage FCC identification number is NVSCTX-iOOO.
©CUBIC-COMMUNICATION5 PA-SOSDA TECHNICAL MANUAL
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1 GENERAL DESCRIPTION .......
1-1 INTRODUCTION. ............
1-3 EQUIPMENT DESCRIPTION ,
1-3 EQUIPMENT FURNISHED ,
1-4 STORAGE DATA ...........
1-5 TOOLS AND TEST EQUIPMENT 1
1—6 SAFETY PRECAUTIONS ..........
2 PREPARATION FOR USE AND INSTALLATION INSTRUCTIONS ...............
2 I INTRODUCTION, .
2 2 UNPACKING AND IN
2-3 INSTALLATION .. .
2 4
2 5
CONNECTIONS .. . .
INITIAL ALIGNMENT PROCEDURES ,. . ._-7
3 OPERATING INSTRUCTIONS ........................................................... 34
INTRODUCTION .
3 1
3-3 OPERATION .....
3 3 EMERGENCY OPERATION ,..
4 GENERAL THEORY OF OPERATION .................................................... 4»!
A-I INTRODUCTION .............................
4~2 GENERAL THEORY OF OPERATION .
4~2.I Power Dig/ribulion ..
A 7.2 g ergI/er Bnard .
15 I v .........
Filler Driver BQard .
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5 MAINTENANCE INSTRUCTIONS ............................
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Section I. PREVENTIVE MAINTENANCE ,1..
5 I INTRODUCTION ..................
5 Z CLEANING AND LUBRICATION ..
5-3 INSPECTION ................. . .
5 4 PERFORMANCE VERIFICATION .................
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Section II. CORRECTIVE MAINTENANCE ..
5-5 TROUBLESHOOTING ............
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6 PREPARATION FOR RESHIPMENT
6- I INTRODUCTION
6-2 DISASSEMBLY AND REMOVAL ,
6-3 PACKAGING ,..
6-4 SHIPPING ......
7 STORAGE ............................................................................. 7-I
7—1 INTRODUCTION ............ . 7»I
7-2 STORAGE ENVIRONMENT _ 7.1
7-3 PRESERVATION .......... I 7—I
8 PARTS LIST ........................................................................... 8-1
8-1 INTRODUCTION ........................ . 8-1
8-2 REPLACEABLE PARTS LISTING ........... , S-I
APPENDIX A: REMOTE CONTROL CABLE . A-I
A-l INTRODUCTION . . . A-I
A-2 DRAWING ....... . A-I
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1-1 PA-SOSOA Front View . 1-2
Z-l PA-SOSOA Rear Panel A. 2.3
3-1 PA-SOSOA Front Panel Controls and Indicators , 4 4 . . 3-2
F0~l PA-SOSOA Outline and Mounting Drawing 4 . , Fp,|
FO-2 PA-SOSOA Block Diagram ........ ' pp_3
170-3 PA-SOSOA Interconnect Diagram . . . Fp_5
F0-4 PA-SOSDA Replaceable Parts Locator Diagram t . . , FP-7
LIST OF TABLES
l-l PA-SOSOA Specifications 4.. . 13
1-2 Items Fumished and Required . . 1.4
1-3 Recommended Tools and Test Equipment (Or Equivalent) . 1-4
2-1 Rear Panel Connections . 2,2
2-2 DC POWER (13) Pin Descriptions 4 A 2-4
2-3 SIGNAL (14) Pin Descriptions 4 . . . . 2-5
2-4 REMOTE CONTROL (IS) Pin Descriptions . . 2-6
3-1 Front Panel Controls and Indicators ......... . 3-1
3-2 PA-SOSOA Serial Bus Command and Status Messages ....... 3-3
5-1 Front Panel LED Interpretation. 4 5-3
8-l Replaceable Parts List .......... 8-1
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CHAPTER 1
GENERAL DESCRIPTION
1—1 INTRODUCTION. This chapter contains a description ofthe equipment supplied, equipment required but not
supplied. storage data. and recommended tools and test equipment.
1-2 EQUIPMENT DESCRIPTION. The PA~5050A linear power amplifier (figure 1-1) is asolid stale unit that
power amplifier (PA) modules lfone or more ofthe PA modules fail, the unit will still operate with reduced power
out.
The front panel contains a PWR LED with each PA module eonlaining an individual PWR and FLT LED. and a
multifunction display. Input power In the PA»5050A is derived from a separate 728V DC power supply providing
five separate *28V DC outputs. Tne CCI PS-7l30A meets this requirement and is recommended for optimum
The rear panel contains connectors for the transmitter/exciter low power RF input, high power RF output to the
antenna, remote conrrol input. DC power and signal input, and a ground lug.
Four internal fans per PA module provide cooling across the heatsink ofthe unit.
Refer to table H for specifications ofthe equipment.
1-3 EQUIPMENT FURNISHED. Table l-Z lists the items furnished, items required but not supplied. and
optional items.
14 STORAGE DATA. Refer to Chapter 7 for storage data.
1-5 TOOLS AND TEST EQUIPMENT. Table I-3 lists recommended tools and test equipment for operational
level maintenance. There are no special tools or test equipment required
1-5 SAFETY PRECAUTIONS. Safen' precautions are presented in this manual preceded by the word
WARNING or CAUTIONjust before the point where the haurd is likely to be encountered. Warnings and cautions
are defined as follows.
Refers to a procedure or practice that. ifnot correctly followed.
could result in injury. death. or long term health hazard.
Refers to a procedure or practice that. ifnot correctly followed,
could result in damage to. or destruction ofequipment.
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Table 1-1 PA-5050A Specifications.
PA—5050A TECHNICAL MANUAL
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r- Specification
ELECTRICAL
REQUlREMENTS
Frequency Range
1.6 - 30.0 MHz
Power Output
I kW peak. (900 w from 28MH1 - 30 MHz) Rated for 100% continuous duty 5513,
CW, AM, or FSK.
Drive Level
20 to 100 milliwatts input for 1000 watts output.
lnlcrmodulalion Distortion
(dB below 1 kW PEP) 3rd order 32 dB, Sth order 37 dB typical.
Output Impedance
Filter Bands (in MHz) Band 0 1.60 » 2.31 Band 4 6.94 - 9.99
Band 1 . 3.33 Band 5 10.00 » 14.41
Band 2 . 4.80 Band 6 14.42 - 20.79
Band 3 4.81 - 6.93 Band 7 20.80 , 30.00
Input VSWR Less than 2:1
50 ohms. Gradual power shutdown above 100W reflected power.
Input Voltage
1 +28VDC, 25A (4 sources), and +28VDC. 11A (1 source).
ENVIRONMENTAL
Ambient Temperature
Humidity
_l
0 to A50°C operating, »40 to +75°C storage
F959, (non-condensing)
Cooling
Forced air cooling with (our fans per each PA module.
Thermal Monitoring
One thermal switch continually monitors the driver and four additional thermal
switches continually monitors each power supply. lfan over temperature condition
(is above 85° C) should occur in anyone unit, power to the driver or the a PA
module will automatically shut off. ”power to the driver is shut off. the PA
modules will not work until the temperature ofthe driver drops below 85° C.
INTERFACE
CONNECTORS On Chassis Mates wuh
INPUT N~ryp= (F) N-typE (M)
ANT X»t,\'pe (F) N-typc (M)
DC POWER 2241-4304.) 2241-4304-4 (CCl P/N)
REMOTE CONTROL 35 - D Sub (F) 25 - D Sub (M)
(RS-485. its-232)
SIGNAL 25-DSuh(F) 25»DSub(M)
PHYSICAL
Size 7 75 m. high K 19 in. wide x 21.2 in deep (front panel to rearhandles)
Weight Approx. 75 pounds
1-3
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Table 1-2 Items Furnlshed and Required.
fl
Part No. Qty Nomenclature L FurnJRequOpt.
2241-1000-3 Oi PA-SOSOA Power Amplifier (FCC i D it stc'rs-ioooi Furnished
2241402 I-3 01 Technical Manual, Operation and Maintenance Furnished
Instructions, POWER AMPLIFIER, PA—SOSOA
224240004 0] Cubic PS-7l30A. Furnished
(Four independent Power Sources @ +28VDC t 10%,
25 amperes., and one source @ +28VDC ilO‘Vo‘ 11
amperes.)
2607-1000-9 0! Cubic T-4 150/114 l 80 Furnished __I
i. (MF-HF Transmitter/Exciter, 20-100 milliwatts PEP)
2241-5023-1 01 Remote Control Cable. PA to Exciter Optional, fumished with
_l 1 FCC system
- 0] L Antenna system and attaching cables Reqdi Noi supplied
Table 1—3 Recommended Tools and Test Equipment (Or Equivalent).
Part No. Nomenclature Manufacturer
.__.
- Flat~blade screwdriver. 6 in Standard issue
“i . . . A r
- No. 2 Phillips screwdriver, 6 in. Standard Issue
l__ SOSOA Digital multimeter Fluke
8890-300 RF Coaxial Loadr I kW. 50 ohms Bird
4421 RF Power Meter Bird
i— r__
402] Directional Power Sensor Bird
PA-SOSOA TECHNICAL MANUAL
1—4
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CHAPTER 2 .
PREPARATION FOR USE AND INSTALLATION INSTRUCTIONS
2-1 INTRODUCTION. This chapter contains unpacking, inspection, installation, connections, and initial
alignment procedures for the PA»5050A
2-2 UNPACKING AND INSPECTION. To unpack and inspect the PA~5050A for damage, perform
the following procedures:
1, Inspect the shipping canon for damage before unpacking the PA-SOSO.
NOTE
lfthe carton is damaged, open the carton in the presence ofa shipping carrier agent if
possible. lfdamage is found after the PA-SOSOA is unpacked, retain the canon and
packing materials for inspection.
2. Open the carton and remove the foam packing material on top ofthe PA—SOSOAr
Two-man lift, Unit weighs approx. 75 pounds. Be careful when
lifting the unit to avoid injury or damage to the equipment.
CAUTION
Do not support the Weight ofthe unit by the front panel alone. The
chassis may bend or warp Use chassis slides or a suitable support
shelf.
3 Lift the PA-SOSOA from the canon
NOTE
The carton should be saved for possible
reshipment
4. Inspect the PA-SOSOA (or external damage including dents and scratches. Do not attempt to operate the
PA-SOSOA ifdamage is found.
2-3 INSTALLATION. The PAvSOSUA is designed for rack slide mounting in a relatively dust free envi»
ronment with an ambient temperature range bet\\een 0 and +500
CAUTION
Ensure slide mounting screws are ofthe proper
length. lfscreus are too long internal equipment
may be damaged.
2-1
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NOTE
See figure FO-l for clearance requirements and mounting details,
I. Securely mount the outer section ofthe slides to the rack cabinet being sure to select the correct mounting
holes.
Attach indicated right and left slide rails to each side of unit.
to
Before tightening the mounting screws, slide the chassis assembly into the rack mounted portion ofthe slides
and adjust the hardware position as required for a smooth sliding fit.
4. Remove unit from rack and securely lighten all hardware.
2-4 CONNECTIONS. Refer to table 2-1 and connect the ground lug, RF Input, RF Out-put, Power/Signals, and
Remote Control cables to the unit. (See figure 2-1.)
NOTE
Refer to the CC1 T-4lSO/80 and/or PS-7130A Technical Manuals ifused,
WA RNING
Severe injury or DEATH can result ifbodily contact is made with an ungmunded chassis should mgr leakage
current or a shon~circuit condition occur.
Table 2-1 Rear Panel Connections.
Name Type Mating Type Description
FNPUT (ll) 1. N-tvpc (F) N-rxpe (M) RF input l.6 to 30 MHL 20 - 250 milliwztts.
ANT (JZ) N-lee (F) N»tx2e(t\1l RF output 1.6 to 30 MHZ. LOGO watts
PWR (13) (320-107) (320406) eZXV DC Input voltages. control. and confidence
signals to/from the power Suppl} lCCl PS-7l30A r.
Table 2-3 lists the_s_ignals on each pin orrno connector.
SIGNAL lJ-ll 25 - D Sub (Fl 25 - l) Sub [Ml LED and 28V Sense lines between PS-7130A and
PA-5050A. Table 1-3 lists the Signals on each pm of
the connector
SERIAL REMOTE (15; 15 - D Sub (Fl 25 - 0 Sub (Mt RS-485 input. Normally connected ro cc1 T-4150/80
(RS-435) CxCllcr. Table 2-4 lists the Signals on each pin nflhc
connector.
GND Slud’thg nut This connection IS requtred for ground loop interference
(EduClIOI’L leakage current and/or short circuibcurtent
palhs. Use 3/4-lrlch wide bralded lead and connect to
unpainted. clean. bare metal on platform ground
NOTE Part numbers in parenthesis (000-000) mdlcalc CCI part number ifappllcable
2-2
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Table 2-2 DC POWER (J3) Pin Descriptions.
Pin Signal LRemarks
A —I +28VDC UI PSI InEul
N GND UI PSI Input j
J +28VDC U2 PSZ Input
T GND 02 P32 Input
5 +28VDC U3 P33 Inpul
E |___ GND U3 PS} Input
R +28VDC U4 PS4 Inpul 1
P I: GND U4 PS4 Input
U +2svoc U5 LAUXIEput
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Table 2-3 SIGNAL (J4) Pin Descriptions
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Pin Signal JRemarks
1 a] LED+, zsv 51 Power Supply 12 pin 4
"I
2 41 LED-, GND 14] Power Supply 12 pin 5
3 £2 LED+, 28V #2 Power s_up_p|y JZ gin 4
4 =2 LED;x GND 142 Power Supplv JZ 91115
5 E3 LEDt 28V #3 Power Supply JZJJin 4
6 4‘3 LED—, GND 53 Power Sum JZpin 5 A]
7 fi4 LED+, 28V #4 Power SuEEIv 12 pin 4
8 L #4 LED-, GND 114 Power Supply 12 pin 5 J
9 fl] Scnse+ ’_' Power Suppl): 13 pin 1
10 131 Sensc- Power Sgpp1v 13 pin 2
11 #2 Sense+ Power Supp1v13 pin 1
12 £2 Sense— Power SupD1v13 pin 2
13 $13 Scnse+ _‘ Power Supplv 13 pin I _]
14 33 Sense- Power SupprJ3J71n 2
15 frd Sense? Power Supplu 13 pin 1 __I
16 #4 Sense— Power Supp1v13p_in 2
17 (Op!) $5 Sense- Power Supplv 13 pin 1
18 (Opt) is Sense~ Power Supp1v13 pin 2
19 (013035 LED‘. 28V Power Suppl\ 12 pin 4
20 __1 {Opt1#5 LED-. GND Power Sunplv 12 pin 5
21-25 NC
2-5
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PA-SDSDA TECHNICAL MANUAL
Table 2-4 REMOTE CONTROL (J5) Pin Descriptions
Pin Signal Remarks
1 TX KEY Fwd to Key
.._1
2 TXD RS- 32
3 RXD RS-232
4 RTS RS-232
5 CTS RS-232
6 NC
7 GND
843 NC
14 TX+ RS-485 SDA
15 TX- RS—485 SDB
16 RX+ RS-485 RDA
17 RX- 115-485 RDB
18 NC
19 UDTXD Upload
20 GND [MD
21 Mm lylload
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21-15 M
2-6
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2—5 INITIAL ALIGNMENT PROCEDURES.
NOTE
This procedure is used only when the system is
turned on for the first time or when the T-4180
exciter is changed.
Setting PAPl Manually:
I.
2.
3.
a:
lfthe PS-7130A and the PA-SOSOA are on, turn them off,
Press the button on the PA-SOSOA and hold down while turning on the PS-7l 30A.
The LED readout will display “TURN OFF TO ABORT". Release the button. Press the bunon when the readout
displays “PRESS TO ERASE" to allow the PA-SOSOA to continue. The readout will display “PAPI NOT $51”.
On the T—4180, set the “FREQ’_’ to 16 MHZ and “LEVEL" to +24 dBm.
Press the “NEXT" key. Press the “PAPOW” key. Press the "100W“ key,
The PA»5050A is now prepared lo pre-set the attenuator for IOO watts. Key the T4180. When the PA-5050A
power stabilizes (between 90 and l30 watts on the PA-SOSOA readout) unkey the exciter.
Tune to the desired operating fi'equency and set the “PAPOW” at l k watt. The PA-SOSOA system is ready to use.
The “PAPOIA’” must be reset whenever the frequency
is changed more than ZMHZ
2—7
©CUBIC.CDMMUNICAT|DNS PA-5050A TECHNICAL MANUAL
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CHAPTER 3
OPERATING INSTRUCTIONS
3-1 lNTRODUCTlON. This chapter contains operating instructions for the PA-SOSOA linear power amplifier. A
separate power supply source, transmitter/exciter, and antenna system are required. Refer to the documentation
supplied with the power supply, transmitter/exciter, and antenna system for operation ofthat equipment.
3-2 OPERATION. Operation is performed using the front panel controls and indicators. (See figure 3-1.) Table
3»! lists the front panel controls and indicators and their functions.
To turn on, and initially set-up the PA-SOSOA. perform the following procedures:
1. Apply input power to the equipment from the external power supply.
2. Observe PWR LED on PA-SOSOA Chassis, and all four PA modules light.
3 The PA-SOSOA is remotely controlled using an RS-485 bus connected to the exeiter. Table 3-2 lists the ASCII
commands available.
4. During operation' press the DlSPLAY STATUS button on the front panel to cycle through the different status
messages on the front panel display.
5. Observe that the FLT LED on each PA module does not light during transmission.
6. To shut down the PA-SOEOA remove input power. (Turn the POWER switch to off(down) on the PS-7I3OA).
Table 3-1 Front Panel Controls and Indicators.
Control Function
PWR LED (on chassis) lndicates power is applied to PA»5050A.
PWR LED (on each PA module) lnd|cates power is applied to individual PA module. Power loss may be a result
ofa circuit problem or an over temperature condition.
FLT LED (on each PA module) lndlcates PA module gain is less than ~10 dBt. LED goes off when gain is
greater than 010 dB with some modulated signals. The FLT LED may
momentarily flicker
DISPLAY STATUS button Works independently or in conjunction with keying the microphone,
Microphone keyed/button not pressed. FWD xx REV xx
Microphone keyed/button pressed: VSWH X.X:1
Microphone not keyed/button not pressed: FREQ xxxxxxxx
Microphone not keyed/button pressed: ATTN xxxx
Note:
‘FWD. REV, and VSWR values are not valid below 50 watts output power.
3-3 EMERGENCY OPERATlON There are no emergency operating procedures for the unit Power is
removed from the un|t by turning offthe power at the input power supply (PS-7130A front panel switch/clrcuit
breaker ifmstalled).
3-1
Z'E
PA MODULE
POWER on (4) FAULT (4)
INPUT
POWER
ON
um.
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DISPLAY STATUS SELECT DISPLAY
Figure 3-1 PA-5050A Front Panel Controls and Indicators,
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Table 3-2 PA-5050A Serial Bus Command and Status Messages.
Syntax 1 Reply L Description
Command Messages
PAF12345678 1— m Set operating frequency in Hz. Range 1.6 . 30 MHZ. This
will select the appropriate low pass filter.
PAW --- Set the power output. Valid ranges are l=100W, 2=500W,
3=1KW below 28 MHZ 8: 900W at 28 MHZ and above J
PT it --- Software TxKey. I = TX, 0 = RX
ATNXXxx --» Set front and attenuation value 00.00 to 32.00 dB. (XX.xx)
PER »-- Erases the lower user block of flash memory where the
calibration values are stored.
r“
Status Messages
PAF? PAFxxxxxxxx Where xxxxxxxx is the frequency in Hz.
PA? F, SWR, FWD, REV, ATN, Request Power Amplifier Status Message. This will reply
FLT, KEY, BND, OT with a complete status message of all settings.
SWR'.7 SWRxx Where xx is in the range ofl.0 to 6.0.
J (e.g.SWR13 indicates a SWR ofl.3:l)'.
FWD? FWDxxxx Where xxxx is measured forward power in watts .
Range of0 to 1999 '.
REV? REVxxx Where xxx is measured reverse power in watts .
.l. Range Mo to 999 ‘.
_r
ATN? A‘I'Nxxxx Where xxxx is the current from end attenuation setting.
Range 0 to 32 dB. (XX.xx)
FLT? FLTxxxxx Where xxxxx is fault status ofeach power module in the
l format. Driver:PAl:PA2:PA31PA4. l=FAULT 0=NONE
FLTA? FLTAxxxxxxxxxx Accumulated Fault listing. Shows all faults that have
occurred since power-up. First 5 positions are the same as
OT? and the next 5 positions are the same as FLT‘.7
KEY? KEYx rWhere x is the transmit key status. l=KEYED 0=lDLE
OT? OTxxxxx Where xxxxx is over temp shutdoun status ofeach power
module in the format: Driver:PAl:PAZ:PA3:PA4.
l=SHUTDOWN 0=NORMAL
All messages use the following format:
lSTXl123IPAF12SOOOOOSPPAPZICR
l l l / l
i—sri—Adr—h— ——-Data F1e1d*—/ ————————— l-r‘
/ / \
S ta : t AS: I I
of Transmission Space Character
(ASCI I Code 02)
Adr: Address set to II} (range 0 to 254, 255 reserved for broadcast mode)
Data Fieldt Separate commands by a spaCe. (Example above = set frequenC) to 12 5 MHz (space) power out to 500W)
Note: 'FWD. REV. and VSWR values are not valid below 50 watts out ut ower
3-3
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4-2
CHAPTER 4
GENERAL THEORY OF OPERATION
INTRODUCTION. This chapter contains a block diagram description ofthe PA-SOSOA linear power
amplifier. The following paragraphs describe operation of the PA-SOSOA (see figure FO-2).
GENERAL THEORY OF OPERATION.
4-2.l Bower Dista‘fiuflgn. Power is applied to the rear panel ofthe unit on connector“. Five individual +28V
DC inputs are required to operate the equipment. Four ofthe +28V inputs at 25 amperes are applied directly to
each ofthe four PA modules and their associated fans. The other +28V input at ll amperes is applied to the
Attenuator/ Pre-driver module, PA Driver module, Lowpass Filter board. and a DC-DC converter on the
Filter/Driver board that produces +IZV, -IZV, and *5V DC voltages for the internal circuits.
4-22 gzgnlrgllgr figs/g The controller board provides all necessary control signals for the unit using the external
RS-485 remote control bus and internal sensors. The controller board receives control signals on the bus from the
Transmitter/Exciter on rear panel connector 15, and provides status and data information on the front panel display.
Control signals to/from the internal circuits are described as follows:
VVA A ' N Analog signal used to fine mne the attenuation (0 - 2.0 dB) ofthe Attenuator Pre-Driver
Al N (0-3) Digital outputs to coarse tune the attenuation (O - 30 dB, in 2 dB steps) of the Attenuator Pre-
Driver via Filter/Driver circuits
LP (0-2) Digital outputs to select correct lowpass filter for the selected frequency
DRIVER GATE Gates PA Driver on during transmitter/cxciter key, Gates PA Driver offduring unkey, or filter
change.
PAGATE Gates PA modules on during transmitter/exciter keyt Off during unkey, or filter change.
OE/SE Control signals to select and output data from MUX
INMUX Mux data signal input includes fault data from PA Modules and external power supplies
FWD DET Detected forward power input used for display and high power limiting
REFL DET Detected reflected power used for display, calculations, VSWR, and reflected power limiting
DISPLAY
STATUS
SWITCH Front panel sthch input used to step through display
MSTR PWR
LED ~5V (or front panel LED
TXi RSJSS transmit data (2 lines)
RX: RS-485 receive data (2 lines)
TX KEY Transmitter kesline from external transminer/exciter used to gate the PA Driver and PA
Modules.
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4-23 mm The Display board contains a liquid crystal alphanumeric display that provides an indication of
forward power, reflected power, attenuation and frequency. When the front panel DISPLAY STATUS switch is
pressed, the display shows the alternate information.
4-14 Fillgr Qn’vgr BQQLQ Tne Filter/Driver board contains four separate circuits:
DC-DC Convener - converts the +23VDC input power to +12, -12, and +5 VDC for use by the internal circuits.
Filter Driver - contains logic drivers for signals from the Controller board to the Low Pass Filter board, PA Driver
module, and PA modules.
MUX - provides the interface between the PA Modules and Controller board. Also provides LED 1: signals for the
external power supply.
Detector - converts the sampled RF from the Bi-Directional Coupler to DC levels proportional to the forward and
reflected power applied to the antenna. These DC voltages are then applied to the Controller board as FWD DET
and REF]. DET signals. It also provides the SHUTDOWN signal to the Attenuator/Prc-Driver ifexcessive
forward or reflected power is sensed.
4-15 Attenuglgr/Pre-Drivgr Board The RF IN signal from the transmitter/exciter enters the PA-SOSOA on rear
panel connector ll where it is applied to the Attenuator/Pre-Driver board. The signal is attenuated and then
amplified to provide the correct drive level for the PA modules to maintain the 1000 Watts of output power.
Attenuation controls from the Controller board, through the Filter/Driver board, determine the amount of
attenuation to be applied to the signal based on the forward and reflected output power, The four digital A'ITN
lines (0-3) provide coarse attenuation through the Filter/Driver board from 0 to 30 dB in 2 dB steps, while the
analog VVA ATTN signal provides the fine attenuation control continuously from 0 to 2.5 dB. lfthe Detector
circuits on the Filter/Driver board sense excessive forward or reflected power the SHUTDOWN signal adds up to
18 dB of attenuation control as required,
4-16 PA Brit/Er Modulg The signal from the Attenuator/Pre-Driver is then applied to the PA Driver module for
amplification. The DRIVER GATE signal enables the amplifier when the transmitter/exciter is keyed. A thermal
switch opens. removing +28 VDC input voltage to disable the PA Driver in case of an over temperature condition
4-2.7 SQIit‘ter Module, The RF signal from the PA Driver module 15 then applied to the Splitter module. The
Splitter module provides four equal RF outputs to each ofthe four PA modules.
4-18 PA Mggule. The four PA modules are identical and interchangeable. Each PA module amplifies the signal
providing up to 300 Watts of output power to maintain 1000 Watts output. The PAGATE signal enables each
amplifier when the transmitter/exciter is keyed, Power variations are compensated for by varying the attenuation of
the input drive signal to all four modules.
To prevent overdrive damage to the other PA modules, a low-gain detector circuit in each PA module activates
when the gain of the module drops to less than v10 dB The detector circuit lights the red FLT LED on the front
panel of the module. At the same time. a FAULT signal is sent to the MUX circuit on the Filler/Driver board, The
MUX circuit then sends the FAULT signal to the microprocessor on the Controller board. ln response. the
microprocessor. through the Filter.’Driver board, causes an additional -6 dB of attenuation to be applied by the
Attenuator/Pre-Drtver to the RF input of the PA-SOSOA. When the gain is +10 dB or greater the detector resets,
the FLT LED goes off, and normal drive IS restored with modulated signals, the FLT LED may momentarily
flicker
A green PWR LED on the front ofeach module lights when power is applied to the module lfthere is an over
temperature condition. a themtostat switch in the module opens. and the ‘28V used to drive the PWR LED is
removed. Sintultaneousl ' a TEMP sensor s|gnal is sent to the MUX circuit on the Filter/"Driver board. The MUX
then sends the TEMP al to the microprocessor on the Controller board. In response, the microprocessor.
through the Filter'Driver board. causes an additional 6 dB ofartenuation to be applied by the Attenuator/Pre-Driver
4,2
©0UEIC~COMMUNICATIDNS PA—SOSOA TECHNICAL MANUAL
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to the RF input of the PA-SOSOA. This reduction of drive to the PA modules causes the temperature to drop.
When the PA module cools down sufficiently, the then-nostat switch closes. The PWR LED lights. and normal
drive is restored.
Each PA module has a VOLTAGE SENSE line that is sent to the individual extemal power supplies. These
signals allow each external power supply to vary the input voltage to compensate for line loss and load variations.
Ifthe PS-7130A is used, each input voltage is adjusted based on the VOLTAGE SENSE signal.
4-29 nggingr Mggulg The four outputs ofthe PA modules are applied to the Combiner module in parallel,
The Combiner module combines the signals producing the lKW final output,
44.10 lgwnafi Fi/Ler Egg/Q The output of the Combiner module is applied to a Lowpass Filter board. One-of-
eight lowpass filters is selected by the FL signals from the Controller board. The filter selected depends upon the
operating frequency, that is sent to the microprocessor by the exciter/transmitter.
4-1] 1 EiaDiregligznal nggglgr. Afier filtering, the 1 KW signal is applied try a Directional Coupler for sampling.
The sampled signal is applied to the Detector circuits in the Filter Driver board. The 1 KW RF signal is then
applied to the rear panel on 12 as the final output to the transmitting antenna system
4-3
©cualc. COMMUNICATIONS
PA-5050A TECHNICAL MANUAL
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5-2
5-3
5-4
CHAPTER 5
MAINTENANCE INSTRUCTIONS
Section I. PREVENTIVE MAINTENANCE
INTRODUCTION. This chapter contains both preventive and corrective operational level maintenance
instructions. The information includes cleaning and lubrication, ins
pection, performance verification, troubleshooting,
and module replacement.
CLEANING AND LUBRICATION. Clean the external surfaces and front panel ofthe PA-SOSOA every 2
weeks using a vacuum cleaner or small soft brush to remove any din or dust.
INSPECTION. Perform a visual inspection ofthe unit quarterly by checking the unit for physical damage.
PERFORMANCE VERIFICATION. The RF power output ofthe PA-SOSOA should be checked quarterly
as described in the following paragraphs.
99“?‘!\’
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WA RNING
Do not key the PA-SOSOA with the
top cover removed. RF burn
injury may occur,
Remove power to the PA-SOSOA (PS—7130A $1 to off(down)).
CAUTION
lfthe equipment is rack mounted. do not slide the equipment drawer out ofthe rack
mount unless absolutely necessary. Damage to the cables connected to the rear panel
connectors may occur. Ifthe equipment must be pulled out ofthe rack mount. do no!
stress the rear panel cables.
Disconnect antenna coax from ANTjack 12. and connect a 1 kW, 50 ohm dummy load and wanmeter.
Apply power to the unit. (PS-7130A S] to on (up))
Set the transmitter/exciter frequency to 16.0000 MHz in CW mode.
Set rransmitter/exciter power to 20 dBm
On the T~4150/80, set PA power to 1 KW.
NOTE
When the 1 KW soft key is pressed the exciter will key and the PA-
SOSOA attenuators will automatically adjust to obtain the I KW
output power.
Momentarily key transmitterfexciter and observe 1000 : IOO watts on wattmeter.
Repeat steps 4. through 7. at other frequencies as required.
Remove power to the PA-SOSOA (PS-7130A S] to off(down)).
Disconnect the 50 ohm dummy load and uanmeter from ANTjack 12 - reconnect antenna coax.
Return PA-SOSOA to normal configuration.
5-1
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55
Section II. CORRECTIVE MAINTENANCE
TROUBLESHOOTING.
5-51 TLQub/eytwfing Phi/gmnhy. Certain assumptions are made concerning the troubleshooting approach as
applied to the unit as follows:
1. All point-to-point wiring is correct. Therefore, no malfunction is the result ofa wiring (or cable connector) fault.
NOTE
Suspected failure of cables or connectors require
visual inspection and continuity tests using the
appropriate diagram See FO-2 for interconnecting
diagram,
IJ
Malfunctions are non-interactive. Each symptom of a problem is caused by a single malfunction and no
additional failures occurred during the troubleshooting process.
3. Multiple faults can be isolated if they are non-interactive.
4. Preventive maintenance has been performed (Section 1),
5-52 Troubleshooting Procedure. Refer to chapter 4 for the block diagram description. Equipment
troubleshooting should be performed in the following order:
Fault identification.
Initial checks.
LED interpretation.
Module replacement
Voltage/continuity checks.
uvAt-z!J-—
Refer to the following paragraphs for details:
5-5.2.‘l Fault Identifigalion. A fault is usually indicated by the front panel display, and/or a PWR LED not lit,
and/or a FLT LED lit on one ofthe PA modules.
5-522 Initial Chegks. Before detailed troubleshooting, check that the green PWR LED on the front panel of each
PA module is on, the FLT LEDs are off. and power is applied to the equipment ( PS-7130A $1 on (up)). lfone or
more of the PWR lamps are off, and power is applied to the PA-SOSOA, ensure that 4-28\/ DC input voltages are
correct. Check all cables and connectors on the rear panel. and check the input RF drive from the exciter.
Ifone or more PWR LEDs are off, but the master power LED is on, an overheat condition may exist. Unkey the unit
and wait five minutes, then try again. lfthe problem persists, remove and replace the affected module(s).
55.2.3 PA Power and Fig/r LED Infemrgfglign, Each PA module contains a PWR and FLT LED, Table 5»l
lists the conditions of the LEDs. the possible malfunction, and the corrective action.
NOTE
Make sure the exciter is keyed for
correct interpretation of LEDs
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PA—SDSOA TECHNICAL MANUAL
Table 5-1 Front Panel LED Interpretation,
ON TON
l;
Master PWR FLT I‘Condition Corrective Action
PWR
ON ON OFF Normal None
ON OFF OFF 1. Overheat l. Unkey and wait 5 mins.
Check cooling fans
Check ambient temperature
Replace PA module
Replace PA-SOSOA
2. Loss of input voltage to 2. Check input voltage to module
module Replace PA module
1 Replace PA~5050A
ON OFF ON Overheat and low RF power out Unkey and wait 5 mins, 1
Check cooling fans
Check ambient temperature
Replace PA module
Replace PA-SOSOA
to confirm the faulty module,
fans andr‘or the ambient temperature.
sufficient.
ON Low RF power out Check input RF drive from exciter
‘ Replace PA module
Replace PA-SOSOA
OFF OFF OFF No input voltages Check input power supply
41 Replace PA-SOSOA
NOTES:
lfa PWR LED remains off for more than a few seconds, or the FLT LED lights. the fault is usually in the indicated
PA module. Remove power from the unit and remove and replace the suspect PA module With one from another slot
Ifmultiple PWR LEDS are off. excessive temperature may be the problem. Check proper operation of the cooling
lfno power LEDs are oft“. and no FLT LEDs are ltt. check the front panel display for correct VSWR. The problem
may be in the antenna system. Ifthe fault cannot be isolated using the above analysis. the fault is probably in the
chassis or in a non-monitored function in a PA module. Also check that the transminer/exciter drive power is
CUBIC-COMMUNICATIONS PA—5050A TECHNICAL MANUAL
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Turn off power before removing or replacing
modules. Equipment may be damaged ifmodules
are removed or replaced with power applied.
To remove and replace a PA modulet perform the following procedures:
55.3.1 Eemovnl
1, Turn the knurled knobs on the top and bottom ofthe PA module counter-clockwise to release the module from
the chassis.
2. Slide the module out ofthe chassis.
5-5-3-2 Macaw
l. Orient the module to align the connectors on the back of the module with the connectors in the
chassis.
Ensure the module connector is aligned correctly
with the connector in the chassis or the connectors
may be damaged.
[4
Push the module firmly in the chassis to seat the connectors.
c.
Turn the knurled knobs on the top and bottom ofthe module clockwise finger tight to secure the module in the
chassis
5-533 m
The PA-SOSOA (PA) has a calibration function added for calibrating the PAH command after a power amplifier
module. driver module. or T4150/80 has been replaced. The calibration must also be performed after an upload
ofthe software and the first time the system is operated.
The calibration requires an RF input at ‘24dBm, the low-pass filter selected to match the frequency. and the PA is
terminated with a 500 resistive load with at least a IOOOW rating. The calibration will complete within 5 seconds.
To prepare a controller that has been previously calibrated. the flash must be cleared. There are two methods to
accomplish this:
1. Change the power switch to the ON position while pressing the DISPLAY button on the front ol'the PA.
When the display says "PWR OFF TO ABORT", release the button. The display will change to "PRESS TO
ERASE". Press the DISPLAY button again to erase the calibration values. When the erase operation is
complete the display will show "10000000 -l" for about two seconds. The PA is now ready for calibration. If
the power is turned off before the scco'id press. the erase will not occur.
Send the PER command through the R5422 bus to the PA. The display will change to "PRESS TO ERASE”.
Press the DISPLAY bunon to erase the calibration values. When the erase operation is complete the display
will show "10000000 »l" for about two seconds.
5-4
®CUBIQCDMMUNICATIONS ' PA-5050A TECHNICAL MANUAL
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4. Some voltages may be checked on the rear panel connectors Refer to chapter 2 for pin-outs of these
connectors, Some voltages may be checked by removing the module where the signal in question terminates,
and checking the voltage at the connector in the chassis,
Remove the +28V DC input voltages before performing continuity checks, Damage to
the test equipment may occur ifcontinuity checks are performed with input voltages
applied to the equipment.
5. Using an ohmmeter, perform continuity checks using FO—Zt
5—8
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6-1
6—2
6-3
6-4
There are no special shipping requirements for the unit. Commercial or military surface or air shipping services may be
used.
CHAPTER 6
PREPARATION FOR RESHIPMENT
PA-SOSBA TECHNICAL MANUAL
|NTRODUCT|ON. This chapter contains int'orrnation to prepare the equipment for reshipment including
disassembly and removal from the rack mount, packaging, and shipping.
DISASSEMBLY AND REMOVAL. To disassemble and remove the PA-SOSOA from the rack mount,
perform the following procedures:
1. Remove power from the PA-SOSOA.
2. Loosen six screws on front panel holding chassis in mounting rack assembly,
3. Slide drawer to the fully extended position.
4. Disconnect all cables from the PA-SOSOA rear panel.
Two-man lift. Unit weighs approx. 75 pounds. Be
careful when lifting the unit to avoid injury or damage
to the equipment.
Do not support the weight of the unit by the front panel alone. “5
chassis may bend or warp. Use chassis slides or a suitable support shelf.
5. Remove the PA—SOSOA from the rack mount.
PACKAGING.
NOTE
The PA-5050A should be packed
in the original shipping container
ifavailable.
To package the equipment for reshipment perform the following steps:
1, Ensure that there is sufficient foam packing material in the shipping container to protect the unit from any hard
impact.
Cover the unit with foam or bubble-type packing material,
Place the unit in the center ofthe shipping container.
bum
flaps with reinforced packing tape.
If using a cardboard packing canon, securely tape the seams of the carton's top cover, bottom cover, and side
5. Attach labels or stamp in indelible ink the word FRAGILE on the top, bottom, and all sides ofthe container,
SHIPPING.
Unit contains pans and assemblies sensitive to
damage by electrostatic discharge (ESD). Do not
ship or Store near strong electrostatic,
electromagnetic. magnetic or radioactive fields.
6-1
©CUBIC. COMMUNICATIONS PA—SOSDA TECHNICAL MANUAL
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CHAPTER 7
STORAGE
7-1 INTRODUCTION. This chapter contains information for storage of the equipment including environmental
conditions and any special preservation requiremean.
7-2 STORAGE ENVIRONMENT. The PA-SOSOA should be stored indoors in the original shipping container (or
similar container) as described in Chapter 6. The environment should be dry with a temperature range between -40 and
+75 “C.
Unit contains parts and assemblies sensitive to
damage by electrostatic discharge (BSD) Do not ship
or store near strong electrostatic, electromagnetic,
magnetic or radioactive fields.
7-3 PRESERVATION. There are no special coverings or preservation materials required to store the PA»5050A.
7-1
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CHAPTER 8
PARTS LIST
8—1 INTRODUCTION. This chapter contains the pans list for replaceable parts at the operational maintenance level.
8-2 REPLACEABLE PARTS LISTING. Table 8-1 lists the replaceable pans for the unit. (See figure FO-4
(or locations.)
Table 8-1 Replaceable Parts List.
Qty | Description Part Number er‘ J
4 | Power Amplifier Module 2241-1 1 l l—I CCI
'Cubic Communications Inc.
8-1
©CUBlc-CDMMUNICATIDNS PA-5050A TECHNICAL MANUAL
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APPENDIX A
REMOTE CONTROL CABLE
A-1 INTRODUCTION. This appendix contains a description ohhe remote control cable connecting the PA—SOSOA lo the T.
4150/80 excitcr.
A-2 DRAWING. Figure A~I shows the schematic oflhe remote control cable CCI P/‘N 2241-5023-X.
25 Pin 15 Pin
T0 PA-5050A (J5) TO 74150180 (J5)
2241-5023-3
GND
PA KEY
PADAT (+
PADAT (-)
GND
Figure A-1 Schematic, Remote Control Cable 2241—5023-X.
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