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
4-5
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)
7100 163.12500 7175 163.59375 7250 164.06250 7325 164.53125 7400 165.00000 7475 165.46875 7550 165.93750
7101 .13125 7176 .60000 7251 .06875 7326 .53750 7401 .00625 7476 .47500 7551 .94375
7102 .13750 7177 .60625 7252 .07500 7327 .54375 7402 .01250 7477 .48125 7552 .95000
7103 .14375 7178 .61250 7253 .08125 7328 .55000 7403 .01875 7478 .48750 7553 .95625
7104 .15000 7179 .61875 7254 .08750 7329 .55625 7404 .02500 7479 .49375 7554 .96250
7105 .15625 7180 .62500 7255 .09375 7330 .56250 7405 .03125 7480 165.50000 7555 .96875
7106 .16250 7181 .63125 7256 .10000 7331 .56875 7406 .03750 7481 .50625 7556 .97500
7107 .16875 7182 .63750 7257 .10625 7332 .57500 7407 .04375 7482 .51250 7557 .98125
7108 .17500 7183 .643
75
7258 .11250 7333 .58125 7408 .05000 7483 .51875 7558 .98750
7109 .18125 7184 .65000 7259 .11875 7334 .58750 7409 .05625 7484 .52500 7559 .99375
7110 .18750 7185 .65625 7260 .12500 7335 .59375 7410 .06250 7485 .53125 7560 166.00000
7111 .19375 7186 .6625
0
7261 .13125 7336 .60000 7411 .06875 7486 .53750 7561 .00625
7112 .20000 7187 .66875 7262 .13750 7337 .60625 7412 .07500 7487 .54375 7562 .01250
7113 .20625 7188 .67500 7263 .14375 7338 .61250 7413 .08125 7488 .55000 7563 .01875
7114 .21250 7189 .68125
72 64
.15000 7339 .61875 7414 .08750 7489 .55625 7564 .02500
7115 .21875 7190 .68750 7265 .15625 7340 .62500 7415 .09375 7490 .56250 7565 .03125
7116 .22500 7191 .69375 7266 .16250 7341 .63125 7416 .10000 7491 .56875 7566 .03750
7117 .23125 7192 .70000 7267
.
16875 7342 .63750 7417 .10625 7492 .57500 7567 .04375
7118 .23750 7193 .70625 7268 .17500 7343 .64375 7418 .11250 7493 .58125 7568 .05000
7119 .24375 7194 .71250 7269 .18125 7344 .65000 7419 .11875 7494 .58750 7569 .05625
7120 163.25000 7195 .71875 7270
.1
8750 7345 .65625 7420 .12500 7495 .59375 7570 .06250
7121 .25625 7196 .72500 7271 .19375 7346 .66250 7421 .13125 7496 .60000 7571 .06875
7122 .26250 7197 .73125 7272 .20000 7347 .66875 7422 .13750 7497 .60625 7572 .07500
7123 .26875 7198 .73750 7273 .20625 7348 .67500 7423 .14375 7498 .61250 7573 .08125
7124 .27500 7199 .74375 7274 .21250 7349 .68125 7424 .15000 7499 .61875 7574 .08750
7125 .28125 7200 163.75000 7275 .21875 7350 .68750 7425 .15625 7500 .62500 7575 .09375
7126 .28750 7201 .75625 7276 .22500 7351 .69375 7426 .16250 7501 .63125 7576 .10000
7127 .29375 7202 .76250 7277 .23125 7352 .70000 7427 .16875 7502 .63750 7577 .10625
7128 .30000 7203 .76875 7278 .23750 7353 .70625 7428 .17500 7503 .64375 7578 .11250
7129 .30625 7204 .77500 7279 .24375 7354 .71250 7429 .18125 7504 .65000 7579 .11875
7130 .31250 7205 .78125 7280 164.25000 7355 .71875 7430 .18750 7505 .65625 7580 .12500
7131 .31875 7206 .78750 7281 .25625 7356 .72500 7431 .19375 7506 .66250 7581 .13125
7132 .32500 7207 .79375 7282 .26250 7357 .73125 7432 .20000 7507 .66875 7582 .13750
7133 .33125 7208 .80000 7283 .26875 7358 .73750 7433 .20625 7508 .67500 7583 .14375
7134 .33750 7209 .80625 7284 .27500 7359 .74375 7434 .21250 7509 .68125 7584 .15000
7135 .34375 7210 .81250 7285 .28125 7360 164.75000 7435 .21875 7510 .68750 7585 .15625
7136 .35000 7211 .81875 7286 .28750 7361 .75625 7436 .22500 7511 .69375 7586 .16250
7137 .35625 7212 .82500 7287 .29375 7362 .76250 7437 .23125 7512 .70000 7587 .16875
7138 .36250 7213 .83125 7288 .30000 7363 .7687
5
7438 .23750 7513 .70625 7588 .17500
7139 .36875 7214 .83750 7289 .30625 7364 .77500 7439 .24375 7514 .71250 7589 .18125
7140 .37500 7215 .84375 7290 .31250 7365 .78125 7440 165.25000 7515 .71875 7590 .18750
7141 .38125 7216 .85000 7291 .31875 7366 .78750 7441 .25625 7516 .72500 7591 .19375
7142 .38750 7217 .85625 7292 .32500 7367 .79375 7442 .26250 7517 .73125 7592 .20000
7143 .39375 7218 .86250 7293 .33125 7368 .80000 7443 .26875 7518 .73750 7593 .20625
7144 .40000 7219 .86875 7294 .33750 7369 .80625 744
4
.27500 7519 .74375 7594 .21250
7145 .40625 7220 .87500 7295 .34375 7370 .81250 7445 .28125 7520 165.75000 7595 .21875
7146 .41250 7221 .88125 7296 .35000 7371 .81875 7446 .28750 7521 .75625 7596 .22500
7147 .41875 7222 .88750 7297 .35625 7372 .82500 7447 .29375 7522 .76250 7597 .23125
7148 .42500 7223 .89375 7298 .36250 7373 .83125 7448 .30000 7523 .76875 7598 .23750
7149 .43125 7224 .90000 7299 .36875 7374 .83750 7449 .30625 7524 .77500 7599 .24375
7150 .43750 7225 .90625 7300 .37500 7375 .84375 7450 .31250 7525 .78125 7600 166.25000
7151 .44375 7226 .91250 7301 .38125 7376 .85000 7451 .31875 7526 .78750 7601 .25625
7152 .45000 7227 .91875 7302 .38750 7377 .85625 7452 .32500 7527 .79375 7602 .26250
7153 .45625 7228 .92500 7303 .39375 7378 .86250 7453 .331
25
7528 .80000 7603 .26875
7154 .46250 7229 .93125 7304 .40000 7379 .86875 7454 .33750 7529 .80625 7604 .27500
7155 .46875 7230 .93750 7305 .40625 7380 .87500 7455 .34375 7530 .81250 7605 .28125
7156 .47500 7231 .94375 7306 .41250 7381 .88125 7456 .35000
7
531 .81875 7606 .28750
7157 .48125 7232 .95000 7307 .41875 7382 .88750 7457 .35625 7532 .82500 7607 .29375
7158 .48750 7233 .95625 7308 .42500 7383 .89375 7458 .36250 7533 .83125 7608 .30000
7159 .49375 7234 .96250 7309 .43125 7384 .90000 7459 .36875 7534 .83750 7609 .30625
7160 163.50000 7235 .96875 7310 .43750 7385 .90625 7460 .37500 7535 .84375 7610 .31250
7161 .50625 7236 .97500 7311 .44375 7386 .91250 7461 .38125 7536 .85000 7611 .31875
7162 .51250 7237 .98125 7312 .45000 7387 .91875 7462 .38750 7537
.
85625 7612 .32500
7163 .51875 7238 .98750 7313 .45625 7388 .92500 7463 .39375 7538 .86250 7613 .33125
7164 .52500 7239 .99375 7314 .46250 7389 .93125 7464 .40000 7539 .86875 7614 .33750
7165 .53125 7240 164.00000 7315 .46875 7390 .93750 7465 .40625 7540
.8
7500 7615 .34375
7166 .53750 7241 .00625 7316 .47500 7391 .94375 7466 .41250 7541 .88125 7616 .35000
7167 .54375 7242 .01250 7317 .48125 7392 .95000 7467 .41875 7542 .88750 7617 .35625
7168 .55000 7243 .01875 7318 .48750 7393 .95625 7468 .42500 7543 .89375 7618 .36250
7169 .55625 7244 .02500 7319 .49375 7394 .96250 7469 .43125 7544 .90000 7619 .36875
7170 .56250 7245 .03125 7320 164.50000 7395 .96875 7470 .43750 7545 .90625 7620 .37500
7171 .56875 7246 .03750 7321 .50625 7396 .97500 7471 .44375 7546 .91250 7621 .38125
7172 .57500 7247 .04375 7322 .51250 7397 .98125 7472 .45000 7547 .91875 7622 .38750
7173 .58125 7248 .05000 7323 .51875 7398 .98750 7473 .45625 7548 .92500 7623 .39375
7174 .58750 7249 .05625 7324 .52500 7399 .99375 7474 .46250 7549 .93125 7624 .40000