Parts List
Table Of Contents
- 1GENERAL
- 2SYSTEM OVERVIEW
- 2.1Transmitter Operation
- 2.2Frequency Selection
- 2.2.1Synthesizer Transmitter
- 2.3Transmitter Assembly and Adjustment
- 2.3.1Complete Transmitter Alignment
- 2.3.2Frequency Change
- 2.3.3Output Power Adjustment
- 2.3.4Deviation Setting
- 2.3.5Setting RF Alarm Thresholds
- 2.4Recommended Test Equipment List
- 2.5Repair Note
- 2.6Printed Circuitboard Numbering Convention
- 3ILLUSTRATIONS
- 4PARTS LIST
- 5REVISION HISTORY
- TRANSMITTER MAIN BOARD
- 1GENERAL
- 2THEORY OF OPERATION
- 2.1 Transmitter Main Board
- 2.1.1General
- 2.1.2Transmitter Push-To-Talk
- 2.1.2.1Microphone PTT
- 2.1.2.2PTT With Time-Out-Timer
- 2.1.2.3PTT No Time-Out-Timer
- 2.1.2.4Optional Relay
- 2.1.2.5PTT Output
- 2.1.2.6PTT Voltage Switching
- 2.1.2.7Transmitter Standby Modes
- 2.1.3Audio Circuits
- 2.1.3.1Microphone Audio
- 2.1.3.2Received Audio
- 2.1.4Channel Selection
- 2.1.4.1Synthesized Transmitter
- 2.1.4.2Crystal Controlled Transmitter
- 2.1.5Amplifier Circuits
- 2.1.6Time-Out-Timer Circuitry
- 2.2MT-3 Front Panel Board
- 2.3MT-3 Audio Processor (Version 1.6)
- 2.3.1General
- 2.3.2Power Requirements
- 2.3.3Audio Processor Turn-on Time
- 2.3.4Audio Processor Signals
- 2.3.4.1Audio Processor Outputs
- 2.3.4.2Audio Processor Modulation Output
- 2.3.4.3Audio Processor Low Frequency / Direct Mod. Output
- 2.3.4.4Audio Processor Inputs
- 2.3.4.5Audio Processor Microphone Input
- 2.3.4.6Audio Processor Balanced Input
- 2.3.4.7Audio Processor Auxiliary Input
- 2.3.4.8Audio Processor Subtone Inputs
- 2.3.4.9Audio Processor Direct Modulation Input
- 2.4MT-3 Audio Processor (Version 1.8)
- 2.4.1General
- 2.4.2Power Requirements
- 2.4.3Audio Processor Turn-on Time
- 2.4.4Audio Processor Signals
- 2.4.4.1Audio Processor Outputs
- 2.4.4.2Audio Processor Modulation Output
- 2.4.4.3Audio Processor Low Frequency / Direct Mod. Output
- 2.4.4.4Audio Processor Inputs
- 2.4.4.5Audio Processor Microphone Input
- 2.4.4.6Audio Processor Balanced Input
- 2.4.4.7Audio Processor Auxiliary Input
- 2.4.4.8Audio Processor Subtone Inputs
- 2.4.4.9Audio Processor Direct Modulation Input
- 2.5Low Frequency Modulation
- 3TRANSMITTER ALIGNMENT
- 3.1General
- 3.2Repair Note
- 3.3Printed Circuitboard Numbering Convention
- 3.4Recommended Test Equipment List
- 3.5Standard Factory Settings and Jumper Configuration
- 3.5.1MT-3 Transmitter Board Factory Configuration
- 3.5.2MT-3 Audio Processor Factory Configuration (Version 1.6)
- 3.6MT-3 Transmitter Board Alignment
- 3.6.1General
- 3.6.2MT-3 Transmitter Board Test Points
- 3.7Module Installation and Removal
- 3.8MT-3 Audio Processor Alignment (Version 1.6)
- 3.8.1General
- 3.8.2MT-3 Audio Processor Standard Deviation Adjustment
- 3.9Standard Factory Settings and Jumper Configuration
- 3.9.1MT-3 Audio Processor Factory Configuration (Version 1.8)
- 3.10MT-3 Audio Processor Alignment (Version 1.8)
- 3.10.1General
- 3.10.2MT-3 Audio Processor Standard Deviation Adjustment
- 3.11Low Frequency Modulation Configuration
- 3.11.1MT-3 Transmitters
- 3.11.2MT-3 Transmitter Audio Processors
- 3.11.3Synthesizer and Crystal Controlled Oscillator
- 3.11.4Tuning the Transmitter
- 4TRANSMITTER INTERCONNECT PIN DEFINITIONS
- 5ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
- 5.1Transmitter Block Diagram
- 5.2Transmitter Main Board Electrical Assembly
- 5.2.1Transmitter Main Board Top Side Component Layout
- 5.2.2Transmitter Main Board Bottom Side Component Layout
- 5.2.3Transmitter Main Board Schematic Diagram
- 5.3Front Panel Board
- 5.3.1Front Panel Board Component Layout
- 5.3.2Front Panel Board Schematic
- 5.4Audio Processor Electrical Assembly (Version 1.6)
- 5.4.1Audio Processor Component Layout
- 5.4.2Audio Processor Schematic Diagram
- 5.5Audio Processor Electrical Assembly (Version 1.8)
- 5.5.1Audio Processor Component Layout
- 5.5.2Audio Processor Schematic Diagram
- 6PARTS LISTS
- 6.1Transmitter Main Board Parts List
- 6.1.1Transmitter Main Board Electrical Parts List
- 6.1.2Transmitter Main Board Mechanical Parts List
- 6.1.3MT-3 Front Panel Board Electrical Parts List
- 6.2MT-3 Audio Processor Parts List (Version 1.6)
- 6.2.1MT-3 Audio Processor Electrical Parts List (Version 1.6)
- 6.3MT-3 Audio Processor Parts List (Version 1.8)
- 6.3.1MT-3 Audio Processor Electrical Parts List (Version 1.8)
- 7REVISION HISTORY
- AUDIO PROCESSOR
- 1 FM AUDIO PROCESSOR
- 2 SIGNALS
- 3 THEORY OF OPERATION
- 4 ALIGNMENT
- 5 TROUBLESHOOTING - TEST EQUIPMENT NEEDED
- 6 TEMPERATURE COMPENSATION
- 7 ILLUSTRATIONS, TABLES AND SCHEMATIC DIAGRAMS
- 8 FM AUDIO PROCESSOR PARTS LIST
- 9 AM AUDIO PROCESSOR
- 9.1 Introduction
- 9.2 Performance Specifications
- 9.3 Audio Specifications
- 9.4 Audio Circuits
- 9.5 Power Requirements
- 9.6 Transmitter Standby Modes
- 9.7 Audio Circuitry
- 9.8 AM Audio Processor Factory Configuration
- 9.9 AM Audio Processor Alignment
- 9.10 AM Audio Processor Electrical Parts List
- 9.11 AM Audio Processor Component Layout
- 9.12 AM Audio Processor Schematic Diagram
- 10 REVISION HISTORY
- VHF AMPLIFIER
- 1GENERAL
- 2THEORY OF OPERATION
- 3VT-3/150 AMPLIFIER ALIGNMENT
- 3.1General
- 3.2Repair Note
- 3.3Recommended Test Equipment List
- 3.4Printed Circuitboard Numbering Convention
- 3.5Standard Factory Settings and Jumper Configuration
- 3.6VT-3/150 Amplifier Alignment
- 3.6.1General
- 3.6.2VT-3/150 Amplifier Adjustment
- 3.6.2.1General Set-Up
- 3.6.2.2Output Power Alarm (Forward Power)
- 3.6.2.3Output Power
- 3.6.2.4Antenna VSWR Alarm (Reverse Power)
- 3.6.2.5Antenna VSWR Overload
- 3.6.2.6Procedure Verification
- 4ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
- 5PARTS LISTS
- 6REVISION HISTORY
- ENHANCED AM/FM SYNTHESIZER
- 1. GENERAL
- 2. THEORY OF OPERATION
- 2.1 Internal Power and Control (Digital Board)
- 2.2 Synthesizer Analog Circuitry (Analog Board)
- 2.2.1 Common Analog Board Circuitry
- 2.2.2 29 - 71.4 MHz Analog Board Circuitry
- 2.2.3 118 - 159.4 MHz Multichannel AM Analog Board Circuitry
- 2.2.4 128 - 174 MHz Analog Board Circuitry
- 2.2.5 406 - 470 MHz Analog Board Circuitry
- 2.3 Synthesizer Digital Circuitry (Digital Board)
- 2.4 Frequency Control
- 2.4.1 BCD Switch Frequency Control
- 2.4.2 Frequency Select Handle Frequency Control
- 2.5 Synthesizer Base and Frequency Increment Table
- 2.6 5.0/6.25 kHz Channelization.
- 2.7 8.333 kHz Channelization.
- 2.8 12.5 kHz Channelization.
- 3. SYNTHESIZER ALIGNMENT
- 3.1 General
- 3.2 Repair Note
- 3.3 Recommended Test Equipment
- 3.4 OS(R/T)-3(A/H) Synthesizer Factory Configuration
- 3.5 OS(R/T)-3(A/H) Synthesizer Alignment
- 3.5.1 General
- 3.5.2 Synthesizer Test Points
- 3.5.3 Synthesizer Removal and Installation
- 3.5.4 Circuit Board Removal
- 3.5.5 Frequency Adjustment and Channel Selection
- 3.5.5.1 VHF OS(R/T)-3H 29 - 71.4 MHz VCO Alignment
- 3.5.5.2 VHF OS(R/T)-3A 118 - 159.4 MHz Alignment
- 3.5.5.3 VHF OS(R/T)-3H 128 - 174 MHz VCO Alignment
- 3.5.5.4 UHF OS(R/T)-3H 406 - 470 MHz VCO Alignment
- 3.5.5.5 Reference Frequency Alignment
- 3.5.6 Jumper Configuration
- 4. ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
- 4.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Diagrams
- 4.1.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Bottom)
- 4.1.2 OS(R/T)-3H 29 - 71.4 MHz Analog Board Component Layout (Top)
- 4.1.3 OS(R/T)-3H 29 - 71.4 MHz Analog Board Schematic Diagram
- 4.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Diagrams
- 4.2.1 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Bottom)
- 4.2.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Component Layout (Top)
- 4.2.3 OS(R/T)-3A 118 - 159.4 MHz Analog Board Schematic Diagram
- 4.3 OS(R/T)-3H 128 - 174 MHz Analog Board Diagrams
- 4.3.1 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Bottom)
- 4.3.2 OS(R/T)-3H 128 - 174 MHz Analog Board Component Layout (Top)
- 4.3.3 OS(R/T)-3H 128 - 174 MHz Analog Board Schematic Diagram
- 4.4 OS(R/T)-3H 406 - 470 MHz Analog Board Diagrams
- 4.4.1 OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout (Bottom)
- 4.4.2 OS(R/T)-3H 406 - 470 MHz Analog Board Component Layout (Top)
- 4.4.3 OS(R/T)-3H 406 - 470 MHz Analog Board Schematic Diagram
- 4.5 OS(R/T)-3(A/H) Digital Board Diagrams
- 4.5.1 OS(R/T)-3(A/H) Digital Board Component Layout (Bottom)
- 4.5.2 OS(R/T)-3(A/H) Digital Board Component Layout (Top)
- 4.5.3 OS(R/T)-3(A/H) Digital Board Schematic Diagram
- 5. PARTS LISTS
- 5.1 OS(R/T)-3H 29 - 71.4 MHz Analog Board Electrical Parts List
- 5.2 OS(R/T)-3A 118 - 159.4 MHz Analog Board Electrical Parts List
- 5.3 OS(R/T)-3H 128 - 174 MHz Analog Board Electrical Parts List
- 5.4 OS(R/T)-3H 406 - 470 MHz Analog Board Electrical Parts List
- 5.5 OS(R/T)-3(A/H) Digital Board Electrical Parts List
- 5.6 OS(R/T)-3(A/H) Synthesizer Mechanical Parts List
- 6. REVISION HISTORY
- VHF CHANNEL DESIGNATION TABLES
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
4-3
VT-3/160
Channel
Designation
Table:
150
to
174
MHz,
6.25
kHz
Increments
(continued)
Chan.
Freq. Chan. Freq.
Chan.
Freq.
Chan.
Freq.
Chan.
Freq.
Chan.
Freq.
Chan.
Freq.
Num.
(MHz)
Num.
(MHz)
Num.
(MHz)
Num.
(MHz)
Num.
(MHz)
Num.
(MHz)
Num.
(MHz)
6050 156.56250 6125 157.03125 6200 157.50000 6275 157.96875 6350 158.43750 6425 158.90625 6500 159.37500
6051 .56875 6126 .03750 6201 .50625 6276 .97500 6351 .44375 6426 .91250 6501 .38125
6052 .57500 6127 .04375 6202 .51250 6277 .98125 6352 .45000 6427 .91875 6502 .38750
6053 .58125 6128 .05000 6203 .51875 6278 .98750 6353 .45625 6428 .92500 6503 .39375
6054 .58750 6129 .05625 6204 .52500 6279 .99375 6354 .46250 6429 .93125 6504 .40000
6055 .59375 6130 .06250 6205 .53125 6280 158.00000 6355 .46875 6430 .93750 6505 .40625
6056 .60000 6131 .06875 6206 .53750 6281 .00625 6356 .47500 6431 .94375 6506 .41250
6057 .606
25
6132 .07500 6207 .54375 6282 .01250 6357 .48125 6432 .95000 6507 .41875
6058 .61250 6133 .08125 6208 .55000 6283 .01875 6358 .48750 6433 .95625 6508 .42500
6059 .61875 6134 .08750 6209 .55625 6284 .02500 6359 .49375 6434 .96250 6509 .43125
6060 .62500
6
135 .09375 6210 .56250 6285 .03125 6360 158.50000 6435 .96875 6510 .43750
6061 .63125 6136 .10000 6211 .56875 6286 .03750 6361 .50625 6436 .97500 6511 .44375
6062 .63750 6137 .10625 6212 .57500 6287 .04375 6362 .51250 6437 .98125 6512 .45000
6063 .64375
61 38
.11250 6213 .58125 6288 .05000 6363 .51875 6438 .98750 6513 .45625
6064 .65000 6139 .11875 6214 .58750 6289 .05625 6364 .52500 6439 .99375 6514 .46250
6065 .65625 6140 .12500 6215 .59375 6290 .06250 6365 .53125 6440 159.00000 6515 .46875
6066 .66250 614
1
.13125 6216 .60000 6291 .06875 6366 .53750 6441 .00625 6516 .47500
6067 .66875 6142 .13750 6217 .60625 6292 .07500 6367 .54375 6442 .01250 6517 .48125
6068 .67500 6143 .14375 6218 .61250 6293 .08125 6368 .55000 6443 .01875 6518 .48750
6069 .68125 6144
.1
5000 6219 .61875 6294 .08750 6369 .55625 6444 .02500 6519 .49375
6070 .68750 6145 .15625 6220 .62500 6295 .09375 6370 .56250 6445 .03125 6520 159.50000
6071 .69375 6146 .16250 6221 .63125 6296 .10000 6371 .56875 6446 .03750 6521 .50625
6072 .70000 6147 .16875 6222 .63750 6297 .10625 6372 .57500 6447 .04375 6522 .51250
6073 .70625 6148 .17500 6223 .64375 6298 .11250 6373 .58125 6448 .05000 6523 .51875
6074 .71250 6149 .18125 6224 .65000 6299 .11875 6374 .58750 6449 .05625 6524 .52500
6075 .71875 6150 .18750 6225 .65625 6300 .12500 6375 .59375 6450 .06250 6525 .53125
6076 .72500 6151 .19375 6226 .66250 6301 .13125 6376 .60000 6451 .06875 6526 .53750
6077 .73125 6152 .20000 6227 .66875 6302 .13750 6377 .60625 6452 .07500 6527 .54375
6078 .73750 6153 .20625 6228 .67500 6303 .14375 6378 .61250 6453 .08125 6528 .55000
6079 .74375 6154 .21250 6229 .68125 6304 .15000 6379 .61875 6454 .08750 6529 .55625
6080 156.75000 6155 .21875 6230 .68750 6305 .15625 6380 .62500 6455 .09375 6530 .56250
6081 .75625 6156 .22500 6231 .69375 6306 .16250 6381 .63125 6456 .10000 6531 .56875
6082 .76250 6157 .23125 6232 .70000 6307 .16875 6382 .63750 6457 .10625 6532 .57500
6083 .76875 6158 .23750 6233 .70625 6308 .17500 6383 .64375 6458 .11250 6533 .58125
6084 .77500 6159 .24375 6234 .712
50
6309 .18125 6384 .65000 6459 .11875 6534 .58750
6085 .78125 6160 157.25000 6235 .71875 6310 .18750 6385 .65625 6460 .12500 6535 .59375
6086 .78750 6161 .25625 6236 .72500 6311 .19375 6386 .66250 6461 .13125 6536 .60000
6087 .79375 6162 .26250 6237 .7312
5
6312 .20000 6387 .66875 6462 .13750 6537 .60625
6088 .80000 6163 .26875 6238 .73750 6313 .20625 6388 .67500 6463 .14375 6538 .61250
6089 .80625 6164 .27500 6239 .74375 6314 .21250 6389 .68125 6464 .15000 6539 .61875
6090 .81250 6165 .28125 6240 157.75000 6315 .21875 6390 .68750 6465 .15625 6540 .62500
6091 .81875 6166 .28750 6241 .75625 6316 .22500 6391 .69375 6466 .16250 6541 .63125
6092 .82500 6167 .29375 6242 .76250 6317 .23125 6392 .70000 6467 .16875 6542 .63750
6093 .83125 6168 .30000 6243 .76875 631
8
.23750 6393 .70625 6468 .17500 6543 .64375
6094 .83750 6169 .30625 6244 .77500 6319 .24375 6394 .71250 6469 .18125 6544 .65000
6095 .84375 6170 .31250 6245 .78125 6320 158.25000 6395 .71875 6470 .18750 6545 .65625
6096 .85000 6171 .31875 6246 .78750 6321 .25625 6396 .72500 6471 .19375 6546 .66250
6097 .85625 6172 .32500 6247 .79375 6322 .26250 6397 .73125 6472 .20000 6547 .66875
6098 .86250 6173 .33125 6248 .80000 6323 .26875 6398 .73750 6473 .20625 6548 .67500
6099 .86875 6174 .33750 6249 .80625 6324 .27500 6399 .74375 6474 .21250 6549 .68125
6100 .87500 6175 .34375 6250 .81250 6325 .28125 6400 158.75000 6475 .21875 6550 .68750
6101 .88125 6176 .35000 6251 .81875 6326 .28750 6401 .75625 6476 .22500 6551 .69375
6102 .88750 6177 .35625 6252 .82500 6327 .293
75
6402 .76250 6477 .23125 6552 .70000
6103 .89375 6178 .36250 6253 .83125 6328 .30000 6403 .76875 6478 .23750 6553 .70625
6104 .90000 6179 .36875 6254 .83750 6329 .30625 6404 .77500 6479 .24375 6554 .71250
6105 .90625 6180 .37500 6255 .84375 6330 .31250
6
405 .78125 6480 159.25000 6555 .71875
6106 .91250 6181 .38125 6256 .85000 6331 .31875 6406 .78750 6481 .25625 6556 .72500
6107 .91875 6182 .38750 6257 .85625 6332 .32500 6407 .79375 6482 .26250 6557 .73125
6108 .92500 6183 .39375 6258 .86250 6333 .33125
64 08
.80000 6483 .26875 6558 .73750
6109 .93125 6184 .40000 6259 .86875 6334 .33750 6409 .80625 6484 .27500 6559 .74375
6110 .93750 6185 .40625 6260 .87500 6335 .34375 6410 .81250 6485 .28125 6560 159.75000
6111 .94375 6186 .41250 6261 .88125 6336 .35000 641
1
.81875 6486 .28750 6561 .75625
6112 .95000 6187 .41875 6262 .88750 6337 .35625 6412 .82500 6487 .29375 6562 .76250
6113 .95625 6188 .42500 6263 .89375 6338 .36250 6413 .83125 6488 .30000 6563 .76875
6114 .96250 6189 .43125 6264 .90000 6339 .36875 6414
.8
3750 6489 .30625 6564 .77500
6115 .96875 6190 .43750 6265 .90625 6340 .37500 6415 .84375 6490 .31250 6565 .78125
6116 .97500 6191 .44375 6266 .91250 6341 .38125 6416 .85000 6491 .31875 6566 .78750
6117 .98125 6192 .45000 6267 .91875 6342 .38750 6417 .85625 6492 .32500 6567 .79375
6118 .98750 6193 .45625 6268 .92500 6343 .39375 6418 .86250 6493 .33125 6568 .80000
6119 .99375 6194 .46250 6269 .93125 6344 .40000 6419 .86875 6494 .33750 6569 .80625
6120 157.00000 6195 .46875 6270 .93750 6345 .40625 6420 .87500 6495 .34375 6570 .81250
6121 .00625 6196 .47500 6271 .94375 6346 .41250 6421 .88125 6496 .35000 6571 .81875
6122 .01250 6197 .48125 6272 .95000 6347 .41875 6422 .88750 6497 .35625 6572 .82500
6123 .01875 6198 .48750 6273 .95625 6348 .42500 6423 .89375 6498 .36250 6573 .83125
6124 .02500 6199 .49375 6274 .96250 6349 .43125 6424 .90000 6499 .36875 6574 .83750