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
2-4
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
VT-3/140
Channel
Designation
Table:
132
to
150
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)
7215 141.84375 7290 142.31250 7365 142.78125 7440 143.25000 7515 143.71875 7590 144.18750 7665 144.65625
7216 .85000 7291 .31875 7366 .78750 7441 .25625 7516 .72500 7591 .19375
7
666 .66250
7217 .85625 7292 .32500 7367 .79375 7442 .26250 7517 .73125 7592 .20000 7667 .66875
7218 .86250 7293 .33125 7368 .80000 7443 .26875 7518 .73750 7593 .20625 7668 .67500
7219 .86875 7294 .33750 7369 .80625 7444 .27500 7519 .74375 7594 .21250 7669 .68125
7220 .87500 7295 .34375 7370 .81250 7445 .28125 7520 143.75000 7595 .21875 7670 .68750
7221 .88125 7296 .35000 7371 .81875 7446 .28750 7521 .75625 7596 .22500 7671 .69375
7222 .88750 7297 .35625 7372 .82500 7447 .29375 7522 .76250 7597 .23125 7672
.
70000
7223 .89375 7298 .36250 7373 .83125 7448 .30000 7523 .76875 7598 .23750 7673 .70625
7224 .90000 7299 .36875 7374 .83750 7449 .30625 7524 .77500 7599 .24375 7674 .71250
7225 .90625 7300 .37500 7375 .84375 7450 .31250 7525 .78125 7600 144.25000 7675
.7
1875
7226 .91250 7301 .38125 7376 .85000 7451 .31875 7526 .78750 7601 .25625 7676 .72500
7227 .91875 7302 .38750 7377 .85625 7452 .32500 7527 .79375 7602 .26250 7677 .73125
7228 .92500 7303 .39375 7378 .86250 7453 .33125 7528 .80000 7603 .26875 7678 .73750
7229 .93125 7304 .40000 7379 .86875 7454 .33750 7529 .80625 7604 .27500 7679 .74375
7230 .93750 7305 .40625 7380 .87500 7455 .34375 7530 .81250 7605 .28125 7680 144.75000
7231 .94375 7306 .41250 7381 .88125 7456 .35000 7531 .81875 7606 .28750 7681 .75625
7232 .95000 7307 .41875 7382 .88750 7457 .35625 7532 .82500 7607 .29375 7682 .76250
7233 .95625 7308 .42500 7383 .89375 7458 .36250 7533 .83125 7608 .30000 7683 .76875
7234 .96250 7309 .43125 7384 .90000 7459 .36875 7534 .83750 7609 .30625 7684 .77500
7235 .96875 7310 .43750 7385 .90625 7460 .37500 7535 .84375 7610 .31250 7685 .78125
7236 .97500 7311 .44375 7386 .91250 7461 .38125 7536 .85000 7611 .31875 7686 .78750
7237 .98125 7312 .45000 7387 .91875 7462 .38750 7537 .85625 7612 .32500 7687 .79375
7238 .98750 7313 .45625 7388 .92500 7463 .39375 7538 .86250 7613 .33125 7688 .80000
7239 .99375 7314 .46250 7389 .93125 7464 .40000 7539 .86875 7614 .33750 7689 .80625
7240 142.00000 7315 .46875 7390 .93750 7465 .40625 7540 .87500 7615 .34375 7690 .81250
7241 .006
25
7316 .47500 7391 .94375 7466 .41250 7541 .88125 7616 .35000 7691 .81875
7242 .01250 7317 .48125 7392 .95000 7467 .41875 7542 .88750 7617 .35625 7692 .82500
7243 .01875 7318 .48750 7393 .95625 7468 .42500 7543 .89375 7618 .36250 7693 .83125
7244 .02500
7
319 .49375 7394 .96250 7469 .43125 7544 .90000 7619 .36875 7694 .83750
7245 .03125 7320 142.50000 7395 .96875 7470 .43750 7545 .90625 7620 .37500 7695 .84375
7246 .03750 7321 .50625 7396 .97500 7471 .44375 7546 .91250 7621 .38125 7696 .85000
7247 .04375
73 22
.51250 7397 .98125 7472 .45000 7547 .91875 7622 .38750 7697 .85625
7248 .05000 7323 .51875 7398 .98750 7473 .45625 7548 .92500 7623 .39375 7698 .86250
7249 .05625 7324 .52500 7399 .99375 7474 .46250 7549 .93125 7624 .40000 7699 .86875
7250 .06250 7325
.
53125 7400 143.00000 7475 .46875 7550 .93750 7625 .40625 7700 .87500
7251 .06875 7326 .53750 7401 .00625 7476 .47500 7551 .94375 7626 .41250 7701 .88125
7252 .07500 7327 .54375 7402 .01250 7477 .48125 7552 .95000 7627 .41875 7702 .88750
7253 .08125 7328
.5
5000 7403 .01875 7478 .48750 7553 .95625 7628 .42500 7703 .89375
7254 .08750 7329 .55625 7404 .02500 7479 .49375 7554 .96250 7629 .43125 7704 .90000
7255 .09375 7330 .56250 7405 .03125 7480 143.50000 7555 .96875 7630 .43750 7705 .90625
7256 .10000 7331 .56875 7406 .03750 7481 .50625 7556 .97500 7631 .44375 7706 .91250
7257 .10625 7332 .57500 7407 .04375 7482 .51250 7557 .98125 7632 .45000 7707 .91875
7258 .11250 7333 .58125 7408 .05000 7483 .51875 7558 .98750 7633 .45625 7708 .92500
7259 .11875 7334 .58750 7409 .05625 7484 .52500 7559 .99375 7634 .46250 7709 .93125
7260 .12500 7335 .59375 7410 .06250 7485 .53125 7560 144.00000 7635 .46875 7710 .93750
7261 .13125 7336 .60000 7411 .06875 7486 .53750 7561 .00625 7636 .47500 7711 .94375
7262 .13750 7337 .60625
7
412 .07500 7487 .54375 7562 .01250 7637 .48125 7712 .95000
7263 .14375 7338 .61250 7413 .08125 7488 .55000 7563 .01875 7638 .48750 7713 .95625
7264 .15000 7339 .61875 7414 .08750 7489 .55625 7564 .02500 7639 .49375 7714 .96250
7265 .15625 7340 .62500 7415 .09375 7490 .56250 7565 .03125 7640 144.50000 7715 .96875
7266 .16250 7341 .63125 7416 .10000 7491 .56875 7566 .03750 7641 .50625 7716 .97500
7267 .16875 7342 .63750 7417 .10625 7492 .57500 7567 .04375 7642 .51250 7717 .98125
7268 .17500 7343 .64375 7418
.
11250 7493 .58125 7568 .05000 7643 .51875 7718 .98750
7269 .18125 7344 .65000 7419 .11875 7494 .58750 7569 .05625 7644 .52500 7719 .99375
7270 .18750 7345 .65625 7420 .12500 7495 .59375 7570 .06250 7645 .53125 7720 145.00000
7271 .19375 7346 .66250 7421
.1
3125 7496 .60000 7571 .06875 7646 .53750 7721 .00625
7272 .20000 7347 .66875 7422 .13750 7497 .60625 7572 .07500 7647 .54375 7722 .01250
7273 .20625 7348 .67500 7423 .14375 7498 .61250 7573 .08125 7648 .55000 7723 .01875
7274 .21250 7349 .68125 7424 .15000 7499 .61875 7574 .08750 7649 .55625 7724 .02500
7275 .21875 7350 .68750 7425 .15625 7500 .62500 7575 .09375 7650 .56250 7725 .03125
7276 .22500 7351 .69375 7426 .16250 7501 .63125 7576 .10000 7651 .56875 7726 .03750
7277 .23125 7352 .70000 7427 .16875 750
2
.63750 7577 .10625 7652 .57500 7727 .04375
7278 .23750 7353 .70625 7428 .17500 7503 .64375 7578 .11250 7653 .58125 7728 .05000
7279 .24375 7354 .71250 7429 .18125 7504 .65000 7579 .11875 7654 .58750 7729 .05625
7280 142.25000 7355 .71875 7430 .18750 7505 .65625 7580 .12500 7655 .59375 7730 .06250
7281 .25625 7356 .72500 7431 .19375 7506 .66250 7581 .13125 7656 .60000 7731 .06875
7282 .26250 7357 .73125 7432 .20000 7507 .66875 7582 .13750 7657 .60625 7732 .07500
7283 .26875 7358 .73750 7433 .20625 7508 .67500 7583 .14375 7658 .61250 7733 .08125
7284 .27500 7359 .74375 7434 .21250 7509 .68125 7584 .15000 7659 .61875 7734 .08750
7285 .28125 7360 142.75000 7435 .21875 7510 .68750 7585 .15625 7660 .62500 7735 .09375
7286 .28750 7361 .75625 7436 .22500 7511 .693
75
7586 .16250 7661 .63125 7736 .10000
7287 .29375 7362 .76250 7437 .23125 7512 .70000 7587 .16875 7662 .63750 7737 .10625
7288 .30000 7363 .76875 7438 .23750 7513 .70625 7588 .17500 7663 .64375 7738 .11250
7289 .30625 7364 .77500 7439 .24375 7514 .71250
7
589 .18125 7664 .65000 7739 .11875