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
3-1
3 VT-3/160
Channel
Designation
Table:
150-174MHz, 5kHz 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)
000 150.00000
075 150.37500 150 150.75000 225 151.12500 300 151.50000 375 151.87500 450 152.25000
001 .00500
076 .38000 151 .75500 226 .13000 301 .50500 376 .88000 451 .25500
002 .01000
077 .38500 152 .76000 227 .13500 302 .51000 377 .88500 452 .26000
003
.0
1500
078 .39000 153 .76500 228 .14000 303 .51500 378 .89000 453 .26500
004 .02000
079 .39500 154 .77000 229 .14500 304 .52000 379 .89500 454 .27000
005 .02500
080 .40000 155 .77500 230 .15000 305 .52500 380 .90000 455 .27500
006 .03000
081 .40500
15 6
.78000 231 .15500 306 .53000 381 .90500 456 .28000
007 .03500
082 .41000 157 .78500 232 .16000 307 .53500 382 .91000 457 .28500
008 .04000
083 .41500 158 .79000 233 .16500 308 .54000 383 .91500 458 .29000
009 .04500
084 .42000 159 .79500 234 .17000 309 .54500 384 .92000 459 .29500
010 .05000
085 .42500 160 .80000 235 .17500 310 .55000 385 .92500 460 .30000
011 .05500
086 .43000 161 .80500 236 .18000 311 .55500 386 .93000 461 .30500
012 .06000
087 .43500 162 .81000 237 .18500 312 .56000 387 .93500 462 .31000
013 .06500
088 .44000 163 .81500 238 .19000 313 .56500 388 .94000 463 .31500
014 .07000
089 .44500 164 .82000 239 .19500 314 .57000 389 .94500 464 .32000
015 .07500
090 .45000 165 .82500 240 .20000 315 .57500 390 .95000 465 .32500
016 .08000
091 .45500 166 .83000 241 .20500 316 .58000 391 .95500 466 .33000
017 .08500
092 .46000 167 .83500 242 .21000 317 .58500 392 .96000 467 .33500
018 .09000
093 .46500 168 .84000 243 .21500 318 .59000 393 .96500 468 .34000
019 .09500
094 .47000 169 .84500 244 .22000 319 .59500 394 .97000 469 .34500
020 .10000
095 .47500 170 .85000 245 .22500 320 .60000 395 .97500 470 .35000
021 .10500
096 .48000 171 .85500 246 .23000 321 .60500 396 .98000 471 .35500
022 .11000
097 .48500 172 .86000 247 .23500 322 .61000 397 .98500 472 .36000
023 .11500
098 .49000 173 .86500 248 .24000 323 .61500 398 .99000 473 .36500
024 .12000
099 .49500 174 .87000 249 .24500 324 .62000 399 .99500 474 .37000
025 .12500 100 150.50000 175 .87500 250 151.25000 325 .62500 400 152.00000 475 .37500
026 .13000 101 .50500 176 .88000 251 .25500 326 .63000 401 .00500 476 .38000
027 .13500 102 .51000 177 .88500 252 .26000 327 .63500 402 .01000 477 .38500
028 .14000 103 .51500 178 .89000 253 .26500 328 .64000 403 .01500 478 .39000
029 .14500 104 .52000 179 .89500 254 .27000 329 .64500 404 .02000 479 .39500
030 .15000 105 .52500 180 .90000 255 .27500 330 .65000 405 .02500 480 .40000
031 .15500 106 .53000 181 .90500 256 .28000 331 .65500 406 .03000 481 .40500
032 .16000 107
.5
3500 182 .91000 257 .28500 332 .66000 407 .03500 482 .41000
033 .16500 108 .54000 183 .91500 258 .29000 333 .66500 408 .04000 483 .41500
034 .17000 109 .54500 184 .92000 259 .29500 334 .67000 409 .04500 484 .42000
035 .17500 110 .55000 185 .92500 260
.3
0000 335 .67500 410 .05000 485 .42500
036 .18000 111 .55500 186 .93000 261 .30500 336 .68000 411 .05500 486 .43000
037 .18500 112 .56000 187 .93500 262 .31000 337 .68500 412 .06000 487 .43500
038 .19000 113 .56500 188 .94000 263 .31500 338 .69000 413
.0
6500 488 .44000
039 .19500 114 .57000 189 .94500 264 .32000 339 .69500 414 .07000 489 .44500
040 .20000 115 .57500 190 .95000 265 .32500 340 .70000 415 .07500 490 .45000
041 .20500 116 .58000 191 .95500 266 .33000 341 .70500 416 .08000 491 .45500
042
.
21000 117 .58500 192 .96000 267 .33500 342 .71000 417 .08500 492 .46000
043 .21500 118 .59000 193 .96500 268 .34000 343 .71500 418 .09000 493 .46500
044 .22000 119 .59500 194 .97000 269 .34500 344 .72000 419 .09500 494 .47000
045 .22500 120 .60000 195
.
97500 270 .35000 345 .72500 420 .10000 495 .47500
046 .23000 121 .60500 196 .98000 271 .35500 346 .73000 421 .10500 496 .48000
047 .23500 122 .61000 197 .98500 272 .36000 347 .73500 422 .11000 497 .48500
048 .24000 123 .61500 198 .99000 273 .36500 348
.
74000 423 .11500 498 .49000
049 .24500 124 .62000 199 .99500 274 .37000 349 .74500 424 .12000 499 .49500
050 150.25000 125 .62500 200 151.00000 275 .37500 350 151.75000 425 .12500 500 152.50000
051 .25500 126 .63000 201 .00500 276 .38000 351 .75500 426 .13000 501 .50500
052 .26000 127 .63500 202 .01000 277 .38500 352 .76000 427 .13500 502 .51000
053 .26500 128 .64000 203 .01500 278 .39000 353 .76500 428 .14000 503 .51500
054 .27000 129 .64500 204 .02000 279 .39500 354 .77000 429 .14500 504 .52000
055 .27500 130 .65000 205 .02500 280 .40000 355 .77500 430 .15000 505 .52500
056 .28000 131 .65500 206 .03000 281 .40500 356 .78000 431 .15500 506 .53000
057 .28500 132 .66000 207 .03500 282 .41000 357 .78500 432 .16000 507 .53500
058 .29000 133 .66500 208 .04000 283 .41500 358 .79000 433 .16500 508 .54000
059 .29500 134 .67000 209 .04500 284 .42000 359 .79500 434 .17000 509 .54500
060 .30000 135 .67500 210 .05000 285 .42500 360 .80000 435 .17500 510 .55000
061 .30500 136 .68000 211 .05500 286 .43000 361 .80500 436 .18000 511 .55500
062 .31000 137 .68500 212 .06000 287 .43500 362 .81000 437 .18500 512 .56000
063 .31500 138 .69000 213 .06500 288 .44000 363 .81500 438 .19000 513 .56500
064 .32000 139 .69500 214 .07000 289 .44500 364 .82000 439 .19500 514 .57000
065 .32500 140 .70000 215 .07500 290 .45000 365 .82500 440 .20000 515 .57500
066 .33000 141 .70500 216 .08000 291 .45500 366 .83000 441 .20500 516 .58000
067 .33500 142 .71000 217 .08500 292 .46000 367 .83500 442 .21000 517 .58500
068 .34000
14 3
.71500 218 .09000 293 .46500 368 .84000 443 .21500 518 .59000
069 .34500 144 .72000 219 .09500 294 .47000 369 .84500 444 .22000 519 .59500
070 .35000 145 .72500 220 .10000 295 .47500 370 .85000 445 .22500 520 .60000
071 .35500 146 .73000 221 .10500
29 6
.48000 371 .85500 446 .23000 521 .60500
072 .36000 147 .73500 222 .11000 297 .48500 372 .86000 447 .23500 522 .61000
073 .36500 148 .74000 223 .11500 298 .49000 373 .86500 448 .24000 523 .61500
074 .37000 149 .74500 224 .12000 299 .49500 374 .87000
44 9
.24500 524 .62000