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
4-1
4 VT-3/160
Channel
Designation
Table:
150-174MHz, 6.25kHz Increments
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)
5000 150.00000
5
075 150.46875 5150 150.93750 5225 151.40625 5300 151.87500 5375 152.34375 5450 152.81250
5001 .00625 5076 .47500 5151 .94375 5226 .41250 5301 .88125 5376 .35000 5451 .81875
5002 .01250 5077 .48125 5152 .95000 5227 .41875 5302 .88750 5377 .35625 5452 .82500
5003 .01875 5078 .48750 5153 .95625 5228 .42500 5303 .89375 5378 .36250 5453 .83125
5004 .02500 5079 .49375 5154 .96250 5229 .43125 5304 .90000 5379 .36875 5454 .83750
5005 .03125 5080 150.50000 5155 .96875 5230 .43750 5305 .90625 5380 .37500 5455 .84375
5006 .03750 5081 .50625 5156 .97500 5231 .44375 5306 .91250 5381 .38125 5456 .85000
5007 .04375 5082 .51250 5157 .98125 5232 .45000 5307 .91875 5382 .38750 5457 .85625
5008 .05000 5083 .51875 5158 .98750 5233 .45625 5308 .92500 5383 .39375 5458 .86250
5009 .05625 5084 .52500 5159 .99375 5234 .46250 5309 .93125 5384 .40000 5459 .86875
5010 .06250 5085 .53125 5160 151.00000 5235 .46875 5310 .93750 5385 .40625 5460 .87500
5011 .06875 5086 .53750 5161 .00625 5236 .47500 5311 .94375 5386 .41250 5461 .88125
5012 .07500 5087 .54375 5162 .01250 5237 .48125 5312 .95000 5387 .41875 5462 .88750
5013 .08125 5088 .55000 5163 .01875 5238 .48750 5313 .95625 5388 .42500 5463 .89375
5014 .08750 5089 .55625 5164 .02500 5239 .49375 5314 .96250 5389 .43125 5464 .90000
5015 .093
75
5090 .56250 5165 .03125 5240 151.50000 5315 .96875 5390 .43750 5465 .90625
5016 .10000 5091 .56875 5166 .03750 5241 .50625 5316 .97500 5391 .44375 5466 .91250
5017 .10625 5092 .57500 5167 .04375 5242 .51250 5317 .98125 5392 .45000 5467 .91875
5018 .1125
0
5093 .58125 5168 .05000 5243 .51875 5318 .98750 5393 .45625 5468 .92500
5019 .11875 5094 .58750 5169 .05625 5244 .52500 5319 .99375 5394 .46250 5469 .93125
5020 .12500 5095 .59375 5170 .06250 5245 .53125 5320 152.00000 5395 .46875 5470 .93750
5021 .13125 5096 .60000 5171 .06875 5246 .53750 5321 .00625 5396 .47500 5471 .94375
5022 .13750 5097 .60625 5172 .07500 5247 .54375 5322 .01250 5397 .48125 5472 .95000
5023 .14375 5098 .61250 5173 .08125 5248 .55000 5323 .01875 5398 .48750 5473 .95625
5024 .15000 509
9
.61875 5174 .08750 5249 .55625 5324 .02500 5399 .49375 5474 .96250
5025 .15625 5100 .62500 5175 .09375 5250 .56250 5325 .03125 5400 152.50000 5475 .96875
5026 .16250 5101 .63125 5176 .10000 5251 .56875 5326 .03750 5401 .50625 5476 .97500
5027 .16875 5102 .63750 5177 .10625 5252 .57500 5327 .04375 5402 .51250 5477 .98125
5028 .17500 5103 .64375 5178 .11250 5253 .58125 5328 .05000 5403 .51875 5478 .98750
5029 .18125 5104 .65000 5179 .11875 5254 .58750 5329 .05625 5404 .52500 5479 .99375
5030 .18750 5105 .65625 5180 .12500 5255 .59375 5330 .06250 5405 .53125 5480 153.00000
5031 .19375 5106 .66250 5181 .13125 5256 .60000 5331 .06875 5406 .53750 5481 .00625
5032 .20000 5107 .66875 5182 .13750 5257 .60625 5332 .07500 5407 .54375 5482 .01250
5033 .20625 5108 .675
00
5183 .14375 5258 .61250 5333 .08125 5408 .55000 5483 .01875
5034 .21250 5109 .68125 5184 .15000 5259 .61875 5334 .08750 5409 .55625 5484 .02500
5035 .21875 5110 .68750 5185 .15625 5260 .62500 5335 .09375 5410 .56250 5485 .03125
5036 .22500 5111 .69375
5
186 .16250 5261 .63125 5336 .10000 5411 .56875 5486 .03750
5037 .23125 5112 .70000 5187 .16875 5262 .63750 5337 .10625 5412 .57500 5487 .04375
5038 .23750 5113 .70625 5188 .17500 5263 .64375 5338 .11250 5413 .58125 5488 .05000
5039 .24375 5114 .71250 5189 .18125 5264 .65000 5339 .11875 5414 .58750 5489 .05625
5040 150.25000 5115 .71875 5190 .18750 5265 .65625 5340 .12500 5415 .59375 5490 .06250
5041 .25625 5116 .72500 5191 .19375 5266 .66250 5341 .13125 5416 .60000 5491 .06875
5042 .26250 5117 .73125 5192
.
20000 5267 .66875 5342 .13750 5417 .60625 5492 .07500
5043 .26875 5118 .73750 5193 .20625 5268 .67500 5343 .14375 5418 .61250 5493 .08125
5044 .27500 5119 .74375 5194 .21250 5269 .68125 5344 .15000 5419 .61875 5494 .08750
5045 .28125 5120 150.75000 5195
.2
1875 5270 .68750 5345 .15625 5420 .62500 5495 .09375
5046 .28750 5121 .75625 5196 .22500 5271 .69375 5346 .16250 5421 .63125 5496 .10000
5047 .29375 5122 .76250 5197 .23125 5272 .70000 5347 .16875 5422 .63750 5497 .10625
5048 .30000 5123 .76875 5198 .23750 5273 .70625 5348 .17500 5423 .64375 5498 .11250
5049 .30625 5124 .77500 5199 .24375 5274 .71250 5349 .18125 5424 .65000 5499 .11875
5050 .31250 5125 .78125 5200 151.25000 5275 .71875 5350 .18750 5425 .65625 5500 .12500
5051 .31875 5126 .78750 5201 .25625 5276 .72500 5351 .19375 5426 .66250 5501 .13125
5052 .32500 5127 .79375 5202 .26250 5277 .73125 5352 .20000 5427 .66875 5502 .13750
5053 .33125 5128 .80000 5203 .26875 5278 .73750 5353 .20625 5428 .67500 5503 .14375
5054 .33750 5129 .80625 5204 .27500 5279 .74375 5354 .21250 5429 .68125 5504 .15000
5055 .34375 5130 .81250 5205 .28125 5280 151.75000 5355 .21875 5430 .68750 5505 .15625
5056 .35000 5131 .81875 5206 .28750 5281 .75625 5356 .22500 5431 .69375 5506 .16250
5057 .35625 5132 .82500 5207 .29375 5282 .76250 5357 .23125 5432 .70000 5507 .16875
5058 .36250 5133 .83125 5208 .30000 5283 .76875 5358 .23750 5433 .70625 5508 .17500
5059 .36875 5134 .83750 5209 .30625 5284 .77500 5359 .24375 5434 .71250 5509 .18125
5060 .37500 5135 .84375 5210 .31250 5285 .781
25
5360 152.25000 5435 .71875 5510 .18750
5061 .38125 5136 .85000 5211 .31875 5286 .78750 5361 .25625 5436 .72500 5511 .19375
5062 .38750 5137 .85625 5212 .32500 5287 .79375 5362 .26250 5437 .73125 5512 .20000
5063 .39375 5138 .86250 5213 .33125 5288 .8000
0
5363 .26875 5438 .73750 5513 .20625
5064 .40000 5139 .86875 5214 .33750 5289 .80625 5364 .27500 5439 .74375 5514 .21250
5065 .40625 5140 .87500 5215 .34375 5290 .81250 5365 .28125 5440 152.75000 5515 .21875
5066 .41250 5141 .88125 5216 .35000 5291 .81875 5366 .28750 5441 .75625 5516 .22500
5067 .41875 5142 .88750 5217 .35625 5292 .82500 5367 .29375 5442 .76250 5517 .23125
5068 .42500 5143 .89375 5218 .36250 5293 .83125 5368 .30000 5443 .76875 5518 .23750
5069 .43125 5144 .90000 5219 .36875 5294 .83750 536
9
.30625 5444 .77500 5519 .24375
5070 .43750 5145 .90625 5220 .37500 5295 .84375 5370 .31250 5445 .78125 5520 153.25000
5071 .44375 5146 .91250 5221 .38125 5296 .85000 5371 .31875 5446 .78750 5521 .25625
5072 .45000 5147 .91875 5222 .38750 5297 .85625 5372 .32500 5447 .79375 5522 .26250
5073 .45625 5148 .92500 5223 .39375 5298 .86250 5373 .33125 5448 .80000 5523 .26875
5074 .46250 5149 .93125 5224 .40000 5299 .86875 5374 .33750 5449 .80625 5524 .27500