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
3-6
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
VT-3/160
Channel
Designation
Table:
150
to
174
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)
2625 163.12500 2700 163.50000 2775 163.87500 2850 164.25000 2925 164.62500 3000 165.00000 3075 165.37500
2626 .13000 2701 .50500 2776 .88000 2851 .25500 2926 .63000 3001 .00500 3076 .38000
2627 .13500 2702 .51000
27 77
.88500 2852 .26000 2927 .63500 3002 .01000 3077 .38500
2628 .14000 2703 .51500 2778 .89000 2853 .26500 2928 .64000 3003 .01500 3078 .39000
2629 .14500 2704 .52000 2779 .89500 2854 .27000 2929 .64500 3004 .02000 3079 .39500
2630 .15000 2705 .52500 2780
.
90000 2855 .27500 2930 .65000 3005 .02500 3080 .40000
2631 .15500 2706 .53000 2781 .90500 2856 .28000 2931 .65500 3006 .03000 3081 .40500
2632 .16000 2707 .53500 2782 .91000 2857 .28500 2932 .66000 3007 .03500 3082 .41000
2633 .16500 2708 .54000 2783 .9150
0
2858 .29000 2933 .66500 3008 .04000 3083 .41500
2634 .17000 2709 .54500 2784 .92000 2859 .29500 2934 .67000 3009 .04500 3084 .42000
2635 .17500 2710 .55000 2785 .92500 2860 .30000 2935 .67500 3010 .05000 3085 .42500
2636 .18000 2711 .55500 2786 .93000
28 61
.30500 2936 .68000 3011 .05500 3086 .43000
2637 .18500 2712 .56000 2787 .93500 2862 .31000 2937 .68500 3012 .06000 3087 .43500
2638 .19000 2713 .56500 2788 .94000 2863 .31500 2938 .69000 3013 .06500 3088 .44000
2639 .19500 2714 .57000 2789 .94500 2864
.
32000 2939 .69500 3014 .07000 3089 .44500
2640 .20000 2715 .57500 2790 .95000 2865 .32500 2940 .70000 3015 .07500 3090 .45000
2641 .20500 2716 .58000 2791 .95500 2866 .33000 2941 .70500 3016 .08000 3091 .45500
2642 .21000 2717 .58500 2792 .96000 2867 .3350
0
2942 .71000 3017 .08500 3092 .46000
2643 .21500 2718 .59000 2793 .96500 2868 .34000 2943 .71500 3018 .09000 3093 .46500
2644 .22000 2719 .59500 2794 .97000 2869 .34500 2944 .72000 3019 .09500 3094 .47000
2645 .22500 2720 .60000 2795 .97500 2870 .35000
29 45
.72500 3020 .10000 3095 .47500
2646 .23000 2721 .60500 2796 .98000 2871 .35500 2946 .73000 3021 .10500 3096 .48000
2647 .23500 2722 .61000 2797 .98500 2872 .36000 2947 .73500 3022 .11000 3097 .48500
2648 .24000 2723 .61500 2798 .99000 2873 .36500 2948
.
74000 3023 .11500 3098 .49000
2649 .24500 2724 .62000 2799 .99500 2874 .37000 2949 .74500 3024 .12000 3099 .49500
2650 163.25000 2725 .62500 2800 164.00000 2875 .37500 2950 164.75000 3025 .12500 3100 165.50000
2651 .25500 2726 .63000 2801 .00500 2876 .3800
0
2951 .75500 3026 .13000 3101 .50500
2652 .26000 2727 .63500 2802 .01000 2877 .38500 2952 .76000 3027 .13500 3102 .51000
2653 .26500 2728 .64000 2803 .01500 2878 .39000 2953 .76500 3028 .14000 3103 .51500
2654 .27000 2729 .64500 2804 .02000 2879 .39500
29 54
.77000 3029 .14500 3104 .52000
2655 .27500 2730 .65000 2805 .02500 2880 .40000 2955 .77500 3030 .15000 3105 .52500
2656 .28000 2731 .65500 2806 .03000 2881 .40500 2956 .78000 3031 .15500 3106 .53000
2657 .28500 2732 .66000 2807 .03500 2882 .41000 2957
.
78500 3032 .16000 3107 .53500
2658 .29000 2733 .66500 2808 .04000 2883 .41500 2958 .79000 3033 .16500 3108 .54000
2659 .29500 2734 .67000 2809 .04500 2884 .42000 2959 .79500 3034 .17000 3109 .54500
2660 .30000 2735 .67500 2810 .05000 2885 .42500 2960 .8000
0
3035 .17500 3110 .55000
2661 .30500 2736 .68000 2811 .05500 2886 .43000 2961 .80500 3036 .18000 3111 .55500
2662 .31000 2737 .68500 2812 .06000 2887 .43500 2962 .81000 3037 .18500 3112 .56000
2663 .31500 2738 .69000 2813 .06500 2888 .44000 2963 .81500
30 38
.19000 3113 .56500
2664 .32000 2739 .69500 2814 .07000 2889 .44500 2964 .82000 3039 .19500 3114 .57000
2665 .32500 2740 .70000 2815 .07500 2890 .45000 2965 .82500 3040 .20000 3115 .57500
2666 .33000 2741 .70500 2816 .08000 2891 .45500 2966 .83000 3041
.
20500 3116 .58000
2667 .33500 2742 .71000 2817 .08500 2892 .46000 2967 .83500 3042 .21000 3117 .58500
2668 .34000 2743 .71500 2818 .09000 2893 .46500 2968 .84000 3043 .21500 3118 .59000
2669 .34500 2744 .72000 2819 .09500 2894 .47000 2969 .84500 3044 .2200
0
3119 .59500
2670 .35000 2745 .72500 2820 .10000 2895 .47500 2970 .85000 3045 .22500 3120 .60000
2671 .35500 2746 .73000 2821 .10500 2896 .48000 2971 .85500 3046 .23000 3121 .60500
2672 .36000 2747 .73500 2822 .11000 2897 .48500 2972 .86000 3047 .23500
31 22
.61000
2673 .36500 2748 .74000 2823 .11500 2898 .49000 2973 .86500 3048 .24000 3123 .61500
2674 .37000 2749 .74500 2824 .12000 2899 .49500 2974 .87000 3049 .24500 3124 .62000
2675 .37500 2750 163.75000 2825 .12500 2900 164.50000 2975 .87500 3050 165.250
00
3125 .62500
2676 .38000 2751 .75500 2826 .13000 2901 .50500 2976 .88000 3051 .25500 3126 .63000
2677 .38500 2752 .76000 2827 .13500 2902 .51000 2977 .88500 3052 .26000 3127 .63500
2678 .39000 2753 .76500 2828 .14000 2903 .51500 2978 .89000 3053 .26500
3
128 .64000
2679 .39500 2754 .77000 2829 .14500 2904 .52000 2979 .89500 3054 .27000 3129 .64500
2680 .40000 2755 .77500 2830 .15000 2905 .52500 2980 .90000 3055 .27500 3130 .65000
2681 .40500 2756 .78000 2831 .15500 2906 .53000 2981 .90500 3056 .28000 3131 .65500
2682 .41000 2757 .78500 2832 .16000 2907 .53500 2982 .91000 3057 .28500 3132 .66000
2683 .41500 2758 .79000 2833 .16500 2908 .54000 2983 .91500 3058 .29000 3133 .66500
2684 .42000 2759 .79500 2834 .17000 2909 .54500 2984 .92000 3059 .29500 3134 .670
00
2685 .42500 2760 .80000 2835 .17500 2910 .55000 2985 .92500 3060 .30000 3135 .67500
2686 .43000 2761 .80500 2836 .18000 2911 .55500 2986 .93000 3061 .30500 3136 .68000
2687 .43500 2762 .81000 2837 .18500 2912 .56000 2987 .93500 3062 .31000 3137 .68500
2688 .44000 2763 .81500 2838 .19000 2913 .56500 2988 .94000 3063 .31500 3138 .69000
2689 .44500 2764 .82000 2839 .19500 2914 .57000 2989 .94500 3064 .32000 3139 .69500
2690 .45000 2765 .82500 2840 .20000 2915 .57500 2990 .95000 3065 .32500 3140 .70000
2691 .45500 2766 .83000 2841 .20500 2916 .58000 2991 .95500 3066 .33000 3141 .70500
2692 .46000 2767 .83500 2842 .21000 2917 .58500 2992 .96000 3067 .33500 3142 .71000
2693 .46500 2768 .84000 2843 .21500 2918 .59000 2993 .96500 3068 .34000 3143 .71500
2694 .470
00
2769 .84500 2844 .22000 2919 .59500 2994 .97000 3069 .34500 3144 .72000
2695 .47500 2770 .85000 2845 .22500 2920 .60000 2995 .97500 3070 .35000 3145 .72500
2696 .48000 2771 .85500 2846 .23000 2921 .60500 2996 .98000 3071 .35500 3146 .73000
2697 .48500
2
772 .86000 2847 .23500 2922 .61000 2997 .98500 3072 .36000 3147 .73500
2698 .49000 2773 .86500 2848 .24000 2923 .61500 2998 .99000 3073 .36500 3148 .74000
2699 .49500 2774 .87000 2849 .24500 2924 .62000 2999 .99500 3074 .37000 3149 .74500