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
3-9
VT-3/160
Channel
Designation
Table:
150
to
174
MHz,
5
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)
4200 171.00000 4275 171.37500 4350 171.75000 4425 172.12500 4500 172.50000 4575 172.87500 4650 173.25000
4201 .00500 4276 .38000 4351 .75500 4426 .13000 4501 .50500 4576 .88000 4651 .25500
4202 .01000 4277 .38500 4352 .76000 4427 .13500 4502 .51000 4577 .88500 4652 .26000
4203 .01500 4278 .39000 4353 .76500 4428 .14000 4503 .51500 4578 .89000 4653 .26500
4204 .02000 4279 .39500 4354 .77000 4429 .14500 4504 .52000 4579 .89500 4654 .27000
4205 .02500 4280 .40000 4355 .77500 4430 .15000 4505 .52500 4580 .90000 4655 .27500
4206 .03000 4281 .40500 4356 .78000 4431 .15500 4506 .53000 4581 .90500 4656 .28000
4207 .03500 4282 .41000 4357 .78500 4432 .16000 4507 .53500 4582 .91000 4657 .28500
4208 .04000 4283 .41500 4358 .79000 4433 .16500 4508 .54000 4583 .91500 4658 .29000
4209 .04500 4284 .42000 4359 .79500 4434 .17000 4509 .54500 4584 .92000 4659 .29500
4210 .05000 4285 .42500 4360 .80000 4435 .17500 4510 .55000 4585 .92500 4660 .30000
4211 .05500 4286 .43000 4361 .80500 4436 .18000 4511 .55500 4586 .93000 4661 .30500
4212 .06000 4287 .43500 4362 .81000 4437 .18500 4512 .56000 4587 .93500 4662 .31000
4213 .06500 4288 .44000 4363 .81500 4438 .19000 4513 .56500 4588 .94000 4663 .31500
4214 .07000 4289 .44500 4364 .82000 4439 .19500 4514 .57000 4589 .94500 4664 .32000
4215 .07500 4290 .45000 4365 .82500 4440 .20000 4515 .57500 4590 .95000 4665 .32500
4216 .08000 4291 .45500 4366 .83000 4441 .20500 4516 .58000 4591 .95500 4666 .33000
4217 .08500 4292 .46000 4367 .83500 4442 .21000 4517 .58500 4592 .96000 4667 .33500
4218 .09000 4293 .46500 4368 .84000 4443 .21500 4518 .59000 4593 .96500 4668 .34000
4219 .09500 4294 .47000 4369 .84500 4444 .22000 4519 .59500 4594 .97000 4669 .34500
4220 .10000 4295 .47500 4370 .85000 4445 .22500 4520 .60000 4595 .97500 4670 .35000
4221 .10500 4296 .48000 4371 .85500 4446 .23000 4521 .60500 4596 .98000 4671 .35500
4222 .11000 4297 .48500 4372 .86000 4447 .23500 4522 .61000 4597 .98500 4672 .36000
4223 .11500 4298 .49000 4373 .86500 4448 .24000 4523 .61500 4598 .99000 4673 .36500
4224 .12000 4299 .49500 4374 .87000 4449 .24500 4524 .62000 4599 .99500 4674 .37000
4225 .12500 4300 171.50000 4375 .87500 4450 172.25000 4525 .62500 4600 173.00000 467
5
.37500
4226 .13000 4301 .50500 4376 .88000 4451 .25500 4526 .63000 4601 .00500 4676 .38000
4227 .13500 4302 .51000 4377 .88500 4452 .26000 4527 .63500 4602 .01000 4677 .38500
4228 .14000 4303 .51500 4378 .89000 4453 .26500 4528 .64000 4603 .01500 4678
.3
9000
4229 .14500 4304 .52000 4379 .89500 4454 .27000 4529 .64500 4604 .02000 4679 .39500
4230 .15000 4305 .52500 4380 .90000 4455 .27500 4530 .65000 4605 .02500 4680 .40000
4231 .15500 4306 .53000 4381 .90500 4456 .28000 4531 .65500 4606 .03000 4681 .40500
4232 .16000 4307 .53500 4382 .91000 4457 .28500 4532 .66000 4607 .03500 4682 .41000
4233 .16500 4308 .54000 4383 .91500 4458 .29000 4533 .66500 4608 .04000 4683 .41500
4234 .17000 4309 .54500 4384 .92000 4459 .29500 4534 .67000 4609 .04500 4684 .42000
4235 .17500 4310 .55000 4385 .92500 4460 .30000 4535 .67500 4610 .05000 4685 .42500
4236 .18000 4311 .55500 4386 .93000 4461 .30500 4536 .68000 4611 .05500 4686 .43000
4237 .18500 4312 .56000 4387 .93500 4462 .31000 4537 .68500 4612 .06000 4687 .43500
4238
.1
9000 4313 .56500 4388 .94000 4463 .31500 4538 .69000 4613 .06500 4688 .44000
4239 .19500 4314 .57000 4389 .94500 4464 .32000 4539 .69500 4614 .07000 4689 .44500
4240 .20000 4315 .57500 4390 .95000 4465 .32500 4540 .70000 4615 .07500 4690 .45000
4241 .20500 4316 .58000 4391 .95500 4466 .33000 4541 .70500 4616 .08000 4691 .45500
4242 .21000 4317 .58500 4392 .96000 4467 .33500 4542 .71000 4617 .08500 4692 .46000
4243 .21500 4318 .59000 4393 .96500 4468 .34000 4543 .71500 4618 .09000 4693 .46500
4244 .22000 431
9
.59500 4394 .97000 4469 .34500 4544 .72000 4619 .09500 4694 .47000
4245 .22500 4320 .60000 4395 .97500 4470 .35000 4545 .72500 4620 .10000 4695 .47500
4246 .23000 4321 .60500 4396 .98000 4471 .35500 4546 .73000 4621 .10500 4696 .48000
4247 .23500 4322
.6
1000 4397 .98500 4472 .36000 4547 .73500 4622 .11000 4697 .48500
4248 .24000 4323 .61500 4398 .99000 4473 .36500 4548 .74000 4623 .11500 4698 .49000
4249 .24500 4324 .62000 4399 .99500 4474 .37000 4549 .74500 4624 .12000 4699 .49500
4250 171.25000 4325 .62500 4400 172.00000 4475 .37500 4550 172.75000 4625 .12500 4700 173.50000
4251 .25500 4326 .63000 4401 .00500 4476 .38000 4551 .75500 4626 .13000 4701 .50500
4252 .26000 4327 .63500 4402 .01000 4477 .38500 4552 .76000 4627 .13500 4702 .51000
4253 .26500 432
8
.64000 4403 .01500 4478 .39000 4553 .76500 4628 .14000 4703 .51500
4254 .27000 4329 .64500 4404 .02000 4479 .39500 4554 .77000 4629 .14500 4704 .52000
4255 .27500 4330 .65000 4405 .02500 4480 .40000 4555 .77500 4630 .15000 4705 .52500
4256 .28000 4331
.6
5500 4406 .03000 4481 .40500 4556 .78000 4631 .15500 4706 .53000
4257 .28500 4332 .66000 4407 .03500 4482 .41000 4557 .78500 4632 .16000 4707 .53500
4258 .29000 4333 .66500 4408 .04000 4483 .41500 4558 .79000 4633 .16500 4708 .54000
4259 .29500 4334 .67000 4409 .04500 4484 .42000 4559 .79500 4634 .17000 4709 .54500
4260 .30000 4335 .67500 4410 .05000 4485 .42500 4560 .80000 4635 .17500 4710 .55000
4261 .30500 4336 .68000 4411 .05500 4486 .43000 4561 .80500 4636 .18000 4711 .55500
4262 .31000 4337 .68500 441
2
.06000 4487 .43500 4562 .81000 4637 .18500 4712 .56000
4263 .31500 4338 .69000 4413 .06500 4488 .44000 4563 .81500 4638 .19000 4713 .56500
4264 .32000 4339 .69500 4414 .07000 4489 .44500 4564 .82000 4639 .19500 4714 .57000
4265 .32500 4340 .70000 4415
.0
7500 4490 .45000 4565 .82500 4640 .20000 4715 .57500
4266 .33000 4341 .70500 4416 .08000 4491 .45500 4566 .83000 4641 .20500 4716 .58000
4267 .33500 4342 .71000 4417 .08500 4492 .46000 4567 .83500 4642 .21000 4717 .58500
4268 .34000 4343 .71500 4418 .09000 4493 .46500 4568 .84000 4643 .21500 4718 .59000
4269 .34500 4344 .72000 4419 .09500 4494 .47000 4569 .84500 4644 .22000 4719 .59500
4270 .35000 4345 .72500 4420 .10000 4495 .47500 4570 .85000 4645 .22500 4720 .60000
4271 .35500 4346 .73000 4421 .10500 449
6
.48000 4571 .85500 4646 .23000 4721 .60500
4272 .36000 4347 .73500 4422 .11000 4497 .48500 4572 .86000 4647 .23500 4722 .61000
4273 .36500 4348 .74000 4423 .11500 4498 .49000 4573 .86500 4648 .24000 4723 .61500
4274 .37000 4349 .74500 4424 .12000 4499
.4
9500 4574 .87000 4649 .24500 4724 .62000