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
1-4
VHF Transmitter Chan
nel Designation Tables VT-3 132 - 174 MHz
VT-3/140
Channel
Designation
Table:
132
to
150
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)
2375 139.87500 2450 140.25000 2525 140.62500 2600 141.00000 2675 141.37500 2750 141.75000 2825 142.12500
2376 .88000 2451 .25500 2526 .63000 2601 .00500 2676 .38000 2751 .75500 2826
.1
3000
2377 .88500 2452 .26000 2527 .63500 2602 .01000 2677 .38500 2752 .76000 2827 .13500
2378 .89000 2453 .26500 2528 .64000 2603 .01500 2678 .39000 2753 .76500 2828 .14000
2379 .89500 2454 .27000 2529 .64500 2604 .02000 2679 .39500 2754 .77000 2829 .14500
2380 .90000 2455 .27500 2530 .65000 2605 .02500 2680 .40000 2755 .77500 2830 .15000
2381 .90500 2456 .28000 2531 .65500 2606 .03000 2681 .40500 2756 .78000 2831 .15500
2382 .91000 2457 .28500 2532 .66000 2607 .03500 2682 .41000 2757 .78500 2832 .16000
2383 .91500 2458 .29000 2533 .66500 2608 .04000 2683 .41500 2758 .79000 2833 .16500
2384 .92000 2459 .29500 2534 .67000 2609 .04500 2684 .42000 2759 .79500 2834 .17000
2385 .92500 2460 .30000 2535 .67500 2610 .05000 2685 .42500 2760 .80000 2835 .17500
2386
.9
3000 2461 .30500 2536 .68000 2611 .05500 2686 .43000 2761 .80500 2836 .18000
2387 .93500 2462 .31000 2537 .68500 2612 .06000 2687 .43500 2762 .81000 2837 .18500
2388 .94000 2463 .31500 2538 .69000 2613 .06500 2688 .44000 2763 .81500 2838 .19000
2389 .94500 2464 .32000 2539 .69500 2614 .07000 2689 .44500 2764 .82000 2839 .19500
2390 .95000 2465 .32500 2540 .70000 2615 .07500 2690 .45000 2765 .82500 2840 .20000
2391 .95500 2466 .33000 2541 .70500 2616 .08000 2691 .45500 2766 .83000 2841 .20500
2392 .96000 246
7
.33500 2542 .71000 2617 .08500 2692 .46000 2767 .83500 2842 .21000
2393 .96500 2468 .34000 2543 .71500 2618 .09000 2693 .46500 2768 .84000 2843 .21500
2394 .97000 2469 .34500 2544 .72000 2619 .09500 2694 .47000 2769 .84500 2844 .22000
2395 .97500 2470
.3
5000 2545 .72500 2620 .10000 2695 .47500 2770 .85000 2845 .22500
2396 .98000 2471 .35500 2546 .73000 2621 .10500 2696 .48000 2771 .85500 2846 .23000
2397 .98500 2472 .36000 2547 .73500 2622 .11000 2697 .48500 2772 .86000 2847 .23500
2398 .99000 2473 .36500 2548 .74000 2623 .11500 2698 .49000 2773 .86500 2848 .24000
2399 .99500 2474 .37000 2549 .74500 2624 .12000 2699 .49500 2774 .87000 2849 .24500
2400 140.00000 2475 .37500 2550 140.75000 2625 .12500 2700 141.50000 2775 .87500 2850 142.25000
2401 .00500 247
6
.38000 2551 .75500 2626 .13000 2701 .50500 2776 .88000 2851 .25500
2402 .01000 2477 .38500 2552 .76000 2627 .13500 2702 .51000 2777 .88500 2852 .26000
2403 .01500 2478 .39000 2553 .76500 2628 .14000 2703 .51500 2778 .89000 2853 .26500
2404 .02000 2479
.3
9500 2554 .77000 2629 .14500 2704 .52000 2779 .89500 2854 .27000
2405 .02500 2480 .40000 2555 .77500 2630 .15000 2705 .52500 2780 .90000 2855 .27500
2406 .03000 2481 .40500 2556 .78000 2631 .15500 2706 .53000 2781 .90500 2856 .28000
2407 .03500 2482 .41000 2557 .78500 2632 .16000 2707 .53500 2782 .91000 2857 .28500
2408 .04000 2483 .41500 2558 .79000 2633 .16500 2708 .54000 2783 .91500 2858 .29000
2409 .04500 2484 .42000 2559 .79500 2634 .17000 2709 .54500 2784 .92000 2859 .29500
2410 .05000 2485 .42500 256
0
.80000 2635 .17500 2710 .55000 2785 .92500 2860 .30000
2411 .05500 2486 .43000 2561 .80500 2636 .18000 2711 .55500 2786 .93000 2861 .30500
2412 .06000 2487 .43500 2562 .81000 2637 .18500 2712 .56000 2787 .93500 2862 .31000
2413 .06500 2488 .44000 2563
.8
1500 2638 .19000 2713 .56500 2788 .94000 2863 .31500
2414 .07000 2489 .44500 2564 .82000 2639 .19500 2714 .57000 2789 .94500 2864 .32000
2415 .07500 2490 .45000 2565 .82500 2640 .20000 2715 .57500 2790 .95000 2865 .32500
2416 .08000 2491 .45500 2566 .83000 2641 .20500 2716 .58000 2791 .95500 2866 .33000
2417 .08500 2492 .46000 2567 .83500 2642 .21000 2717 .58500 2792 .96000 2867 .33500
2418 .09000 2493 .46500 2568 .84000 2643 .21500 2718 .59000 2793 .96500 2868 .34000
2419 .09500 2494 .47000 2569 .84500 264
4
.22000 2719 .59500 2794 .97000 2869 .34500
2420 .10000 2495 .47500 2570 .85000 2645 .22500 2720 .60000 2795 .97500 2870 .35000
2421 .10500 2496 .48000 2571 .85500 2646 .23000 2721 .60500 2796 .98000 2871 .35500
2422 .11000 2497 .48500 2572 .86000 2647
.2
3500 2722 .61000 2797 .98500 2872 .36000
2423 .11500 2498 .49000 2573 .86500 2648 .24000 2723 .61500 2798 .99000 2873 .36500
2424 .12000 2499 .49500 2574 .87000 2649 .24500 2724 .62000 2799 .99500 2874 .37000
2425 .12500 2500 140.50000 2575 .87500 2650 141.25000 2725 .62500 2800 142.00000 2875 .37500
2426 .13000 2501 .50500 2576 .88000 2651 .25500 2726 .63000 2801 .00500 2876 .38000
2427 .13500 2502 .51000 2577 .88500 2652 .26000 2727 .63500 2802 .01000 2877 .38500
2428 .14000 2503 .51500 2578 .89000 2653
.
26500 2728 .64000 2803 .01500 2878 .39000
2429 .14500 2504 .52000 2579 .89500 2654 .27000 2729 .64500 2804 .02000 2879 .39500
2430 .15000 2505 .52500 2580 .90000 2655 .27500 2730 .65000 2805 .02500 2880 .40000
2431 .15500 2506 .53000 2581 .90500 2656 .2800
0
2731 .65500 2806 .03000 2881 .40500
2432 .16000 2507 .53500 2582 .91000 2657 .28500 2732 .66000 2807 .03500 2882 .41000
2433 .16500 2508 .54000 2583 .91500 2658 .29000 2733 .66500 2808 .04000 2883 .41500
2434 .17000 2509 .54500 2584 .92000 2659 .29500
27 34
.67000 2809 .04500 2884 .42000
2435 .17500 2510 .55000 2585 .92500 2660 .30000 2735 .67500 2810 .05000 2885 .42500
2436 .18000 2511 .55500 2586 .93000 2661 .30500 2736 .68000 2811 .05500 2886 .43000
2437 .18500 2512 .56000 2587 .93500 2662 .31000 2737
.
68500 2812 .06000 2887 .43500
2438 .19000 2513 .56500 2588 .94000 2663 .31500 2738 .69000 2813 .06500 2888 .44000
2439 .19500 2514 .57000 2589 .94500 2664 .32000 2739 .69500 2814 .07000 2889 .44500
2440 .20000 2515 .57500 2590 .95000 2665 .32500 2740 .7000
0
2815 .07500 2890 .45000
2441 .20500 2516 .58000 2591 .95500 2666 .33000 2741 .70500 2816 .08000 2891 .45500
2442 .21000 2517 .58500 2592 .96000 2667 .33500 2742 .71000 2817 .08500 2892 .46000
2443 .21500 2518 .59000 2593 .96500 2668 .34000 2743 .71500
28 18
.09000 2893 .46500
2444 .22000 2519 .59500 2594 .97000 2669 .34500 2744 .72000 2819 .09500 2894 .47000
2445 .22500 2520 .60000 2595 .97500 2670 .35000 2745 .72500 2820 .10000 2895 .47500
2446 .23000 2521 .60500 2596 .98000 2671 .35500 2746 .73000 2821
.
10500 2896 .48000
2447 .23500 2522 .61000 2597 .98500 2672 .36000 2747 .73500 2822 .11000 2897 .48500
2448 .24000 2523 .61500 2598 .99000 2673 .36500 2748 .74000 2823 .11500 2898 .49000
2449 .24500 2524 .62000 2599 .99500 2674 .37000 2749 .74500 2824 .1200
0
2899 .49500