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
4-7
VT-3/160
Channel
Designation
Table:
15
0
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)
8150 169.68750 8225 170.15625 8300 170.62500 8375 171.09375 8450 171.56250 8525 172.03125 8600 172.50000
8151 .69375 8226 .16250 8301 .63125 8376 .10000 8451 .56875 8526 .03750 8601 .50625
8152 .70000 8227 .16875 8302 .63750 8377 .10625 8452 .57500 8527 .04375 8602 .51250
8153 .70625 8228 .17500 8303 .64375 8378 .11250 8453 .58125 8528 .05000 8603 .51875
8154 .71250 8229 .18125 8304 .65000 8379 .11875 8454 .58750 8529 .05625 8604 .52500
8155 .71875 8230 .18750 8305 .65625 8380 .12500 8455 .59375 8530 .06250 8605 .53125
8156 .72500 8231 .19375 8306 .66250 8381 .13125 8456 .60000 8531 .06875 8606 .53750
8157 .73125 8232 .20000 8307 .66875 8382 .13750 8457 .60625 8532 .07500 8607 .54375
8158 .73750 8233 .20625 8308 .67500 8383 .14375 8458 .61250 8533 .08125 8608 .55000
8159 .74375 8234 .21250 8309 .68125 8384 .15000 8459 .61875 8534 .08750 8609 .55625
8160 169.75000 8235 .21875 8310 .68750 8385 .15625 8460 .62500 8535 .09375 8610 .56250
8161 .75625 8236 .22500 8311 .69375 8386 .16250 8461 .63125 8536 .10000 8611 .56875
8162 .76250 8237 .23125 8312 .70000
8
387 .16875 8462 .63750 8537 .10625 8612 .57500
8163 .76875 8238 .23750 8313 .70625 8388 .17500 8463 .64375 8538 .11250 8613 .58125
8164 .77500 8239 .24375 8314 .71250 8389 .18125 8464 .65000 8539 .11875 8614 .58750
8165 .78125 8240 170.25000 8315 .71875
83 90
.18750 8465 .65625 8540 .12500 8615 .59375
8166 .78750 8241 .25625 8316 .72500 8391 .19375 8466 .66250 8541 .13125 8616 .60000
8167 .79375 8242 .26250 8317 .73125 8392 .20000 8467 .66875 8542 .13750 8617 .60625
8168 .80000 8243 .26875 8318 .73750 8393
.
20625 8468 .67500 8543 .14375 8618 .61250
8169 .80625 8244 .27500 8319 .74375 8394 .21250 8469 .68125 8544 .15000 8619 .61875
8170 .81250 8245 .28125 8320 170.75000 8395 .21875 8470 .68750 8545 .15625 8620 .62500
8171 .81875 8246 .28750 8321 .75625 8396
.2
2500 8471 .69375 8546 .16250 8621 .63125
8172 .82500 8247 .29375 8322 .76250 8397 .23125 8472 .70000 8547 .16875 8622 .63750
8173 .83125 8248 .30000 8323 .76875 8398 .23750 8473 .70625 8548 .17500 8623 .64375
8174 .83750 8249 .30625 8324 .77500 8399 .24375 8474 .71250 8549 .18125 8624 .65000
8175 .84375 8250 .31250 8325 .78125 8400 171.25000 8475 .71875 8550 .18750 8625 .65625
8176 .85000 8251 .31875 8326 .78750 8401 .25625 8476 .72500 8551 .19375 8626 .66250
8177 .85625 8252 .32500 8327 .79375 8402 .26250 8477 .73125 8552 .20000 8627 .66875
8178 .86250 8253 .33125 8328 .80000 8403 .26875 8478 .73750 8553 .20625 8628 .67500
8179 .86875 8254 .33750 8329 .80625 8404 .27500 8479 .74375 8554 .21250 8629 .68125
8180 .87500 8255 .34375 8330 .81250 8405 .28125 8480 171.75000 8555 .21875 8630 .68750
8181 .88125 8256 .35000 8331 .81875 8406 .28750 8481 .75625 8556 .22500 8631 .69375
8182 .88750 8257 .35625 8332 .82500 8407 .29375 8482 .76250 8557 .23125 8632 .70000
8183 .89375 8258 .36250 8333 .83125 8408 .30000 8483 .76875 8558 .23750 8633 .70625
8184 .90000 8259 .36875 8334 .83750 8409 .30625 8484 .77500 8559 .24375 8634 .71250
8185 .90625 8260 .37500 8335 .84375 8410 .31250 8485 .78125 8560 172.25000 8635 .71875
8186 .91250 8261 .38125 8336 .85000 8411 .31875 8486
.
78750 8561 .25625 8636 .72500
8187 .91875 8262 .38750 8337 .85625 8412 .32500 8487 .79375 8562 .26250 8637 .73125
8188 .92500 8263 .39375 8338 .86250 8413 .33125 8488 .80000 8563 .26875 8638 .73750
8189 .93125 8264 .40000 8339 .86875 8414 .33750 8489 .8062
5
8564 .27500 8639 .74375
8190 .93750 8265 .40625 8340 .87500 8415 .34375 8490 .81250 8565 .28125 8640 172.75000
8191 .94375 8266 .41250 8341 .88125 8416 .35000 8491 .81875 8566 .28750 8641 .75625
8192 .95000 8267 .41875 8342 .88750 8417 .35625 8492 .82500 8567 .29375 8642 .76250
8193 .95625 8268 .42500 8343 .89375 8418 .36250 8493 .83125 8568 .30000 8643 .76875
8194 .96250 8269 .43125 8344 .90000 8419 .36875 8494 .83750 8569 .30625 8644 .77500
8195 .96875 8270 .43750 8345 .90625 8420 .37500 8495 .84375 857
0
.31250 8645 .78125
8196 .97500 8271 .44375 8346 .91250 8421 .38125 8496 .85000 8571 .31875 8646 .78750
8197 .98125 8272 .45000 8347 .91875 8422 .38750 8497 .85625 8572 .32500 8647 .79375
8198 .98750 8273 .45625 8348 .92500 8423 .39375 8498 .86250 8573
.3
3125 8648 .80000
8199 .99375 8274 .46250 8349 .93125 8424 .40000 8499 .86875 8574 .33750 8649 .80625
8200 170.00000 8275 .46875 8350 .93750 8425 .40625 8500 .87500 8575 .34375 8650 .81250
8201 .00625 8276 .47500 8351 .94375 8426 .41250 8501 .88125 8576 .35000 8651 .81875
8202 .01250 8277 .48125 8352 .95000 8427 .41875 8502 .88750 8577 .35625 8652 .82500
8203 .01875 8278 .48750 8353 .95625 8428 .42500 8503 .89375 8578 .36250 8653 .83125
8204 .02500 8279 .49375 8354 .96250 8429 .43125 8504 .90000 8579 .36875 8654 .83750
8205 .03125 8280 170.50000 8355 .96875 8430 .43750 8505 .90625 8580 .37500 8655 .84375
8206 .03750 8281 .50625 8356 .97500 8431 .44375 8506 .91250 8581 .38125 8656 .85000
8207 .04375 8282 .51250 8357 .98125 8432 .45000 8507 .91875 8582 .38750
8
657 .85625
8208 .05000 8283 .51875 8358 .98750 8433 .45625 8508 .92500 8583 .39375 8658 .86250
8209 .05625 8284 .52500 8359 .99375 8434 .46250 8509 .93125 8584 .40000 8659 .86875
8210 .06250 8285 .53125 8360 171.00000 8435 .46875 8510 .93750 8585 .40625
86 60
.87500
8211 .06875 8286 .53750 8361 .00625 8436 .47500 8511 .94375 8586 .41250 8661 .88125
8212 .07500 8287 .54375 8362 .01250 8437 .48125 8512 .95000 8587 .41875 8662 .88750
8213 .08125 8288 .55000 8363 .01875 8438 .48750 8513 .95625 8588 .42500 8663
.
89375
8214 .08750 8289 .55625 8364 .02500 8439 .49375 8514 .96250 8589 .43125 8664 .90000
8215 .09375 8290 .56250 8365 .03125 8440 171.50000 8515 .96875 8590 .43750 8665 .90625
8216 .10000 8291 .56875 8366 .03750 8441 .50625 8516 .97500 8591 .44375 8666
.9
1250
8217 .10625 8292 .57500 8367 .04375 8442 .51250 8517 .98125 8592 .45000 8667 .91875
8218 .11250 8293 .58125 8368 .05000 8443 .51875 8518 .98750 8593 .45625 8668 .92500
8219 .11875 8294 .58750 8369 .05625 8444 .52500 8519 .99375 8594 .46250 8669 .93125
8220 .12500 8295 .59375 8370 .06250 8445 .53125 8520 172.00000 8595 .46875 8670 .93750
8221 .13125 8296 .60000 8371 .06875 8446 .53750 8521 .00625 8596 .47500 8671 .94375
8222 .13750 8297 .60625 8372 .07500 8447 .54375 8522 .01250 8597 .48125 8672 .95000
8223 .14375 8298 .61250 8373 .08125 8448 .55000 8523 .01875 8598 .48750 8673 .95625
8224 .15000 8299 .61875 8374 .08750 8449 .55625 8524 .02500 8599 .49375 8674 .96250