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
3-2
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)
525 152.62500 600 153.00000 675 153.37500 750 153.75000 825 154.12500 900 154.50000 975 154.87500
526 .63000 601 .00500 676 .38000 751 .75500 826 .13000 901 .50500 976 .88000
527 .63500 602 .01000 677 .38500 752 .76000 827 .13500 902 .51000 977 .88500
528 .64000 603 .01500 678 .39000 753 .76500 828 .14000 903 .51500 978 .89000
529 .64500 604 .02000 679 .39500 754 .77000 829 .14500 904 .52000 979 .89500
530 .65000 605 .02500 680 .40000 755 .77500 830 .15000 905 .52500 980 .90000
531 .65500 606
.0
3000 681 .40500 756 .78000 831 .15500 906 .53000 981 .90500
532 .66000 607 .03500 682 .41000 757 .78500 832 .16000 907 .53500 982 .91000
533 .66500 608 .04000 683 .41500 758 .79000 833 .16500 908 .54000 983 .91500
534 .67000 609 .04500 684 .42000 759 .7950
0
834 .17000 909 .54500 984 .92000
535 .67500 610 .05000 685 .42500 760 .80000 835 .17500 910 .55000 985 .92500
536 .68000 611 .05500 686 .43000 761 .80500 836 .18000 911 .55500 986 .93000
537 .68500 612 .06000 687 .43500 762 .81000 837 .18500 912 .56000
987
.93500
538 .69000 613 .06500 688 .44000 763 .81500 838 .19000 913 .56500 988 .94000
539 .69500 614 .07000 689 .44500 764 .82000 839 .19500 914 .57000 989 .94500
540 .70000 615 .07500 690 .45000 765 .82500 840 .20000 915 .57500 990 .95000
541 .70500 616 .08000 691 .45500 766 .83000 841 .20500 916 .58000 991 .95500
542 .71000 617 .08500 692 .46000 767 .83500 842 .21000 917 .58500 992 .96000
543 .71500 618 .09000 693 .46500 768 .84000 843 .21500 918 .59000 993 .96500
544 .72000 619 .09500 694 .47000 769 .84500 844 .22000 919 .59500 994 .97000
545 .72500 620 .10000 695 .47500 770 .85000 845 .22500 920 .60000 995 .97500
546 .73000 621 .10500 696 .48000 771 .85500 846 .23000 921 .60500 996 .98000
547 .73500 622 .11000 697 .48500 772 .86000 847 .23500 922 .61000 997 .98500
548 .74000 623 .11500 698 .49000 773 .86500 848 .24000 923 .61500 998 .99000
549 .74500 624 .12000 699 .49500 774 .87000 849 .24500 924 .62000 999 .99500
550 152.75000 625 .12500 700 153.50000 775 .87500 850 154.25000 925 .62500 1000 155.00000
551 .75500 626 .13000 701 .50500 776 .88000 851 .25500 926 .63000 1001 .00500
552 .76000 627 .13500 702 .51000 777 .88500 852 .26000 927 .63500 1002 .01000
553 .76500 628 .14000 703 .51500 778 .89000 853 .26500 928 .64000 1003 .01500
554 .77000 629 .14500 704 .52000 779 .89500 854 .27000 929 .64500 1004 .02000
555 .77500 630 .15000 705 .52500 780 .90000 855 .27500 930 .65000 1005 .02500
556 .78000 631 .15500 706 .53000 781 .90500 856 .28000 931 .65500 1006 .03000
557 .78500 632 .16000 707 .53500 782 .91000 857 .28500 932 .66000 1007 .03500
558 .79000 633 .16500 708 .54000 783 .91500 858 .29000 933 .66500 1008 .04000
559 .79500 634 .17000 709 .54500 784 .92000 859 .29500 934 .67000 1009 .04500
560 .80000 635 .17500 710 .55000 785 .92500 860 .30000 935 .67500 1010 .05000
561 .80500 636 .18000 711 .55500 786 .93000 861 .30500 936 .68000 1011 .05500
562 .81000 637 .18500 712 .56000 787 .93500 862 .31000 937 .68500 1012 .06000
563 .81500 638 .19000 713 .56500 788 .94000 863 .31500 938 .69000 1013 .06500
564 .82000 639 .19500 714 .57000 789 .94500 864 .32000 939 .69500 1014 .07000
565 .82500 640 .20000 715 .57500 790 .95000 865 .32500 940 .70000 1015 .07500
566 .83000 641 .20500 716 .58000 791 .95500 866 .33000 941 .70500 1016 .08000
567 .83500 642 .21000 717 .58500 792 .96000 867 .33500 942 .71000 1017 .08500
568 .84000 643 .21500 718 .59000 793 .96500 868 .34000 943 .71500 1018 .09000
569 .84500 644 .22000 719 .59500 794 .97000 869 .34500 944 .72000 1019 .09500
570 .85000 645 .22500 720 .60000 795 .97500 870 .35000 945 .72500 1020 .10000
571 .85500 646 .23000 721 .60500 796 .98000 871 .35500 946 .73000 1021 .10500
572 .86000 647 .23500 722 .61000 797 .98500 872 .36000 947 .73500 1022 .11000
573 .86500 648 .24000 723 .61500 798 .99000 873 .36500 948 .74000 1023 .1150
0
574 .87000 649 .24500 724 .62000 799 .99500 874 .37000 949 .74500 1024 .12000
575 .87500 650 153.25000 725 .62500 800 154.00000 875 .37500 950 154.75000 1025 .12500
576 .88000 651 .25500 726 .63000 801 .00500 876 .38000 951 .75500 1026 .13000
577 .88500 652 .26000 727 .63500 802 .01000 877 .38500 952 .76000 1027 .13500
578 .89000 653 .26500 728 .64000 803 .01500 878 .39000 953 .76500 1028 .14000
579 .89500 654 .27000 729 .64500 804 .02000 879 .39500 954 .77000 1029 .14500
580 .90000 655 .27500 730 .65000 805 .02500 880 .40000 955 .77500 1030 .15000
581 .90500 656 .28000 731 .65500 806 .03000 881 .40500 956 .78000 1031 .15500
582 .91000 657 .28500 732 .66000 807 .03500 882 .41000 957 .78500 1032 .16000
583 .91500 658 .29000 733 .66500 808 .04000 883 .41500 958 .79000 1033 .16500
584 .92000 659 .29500 734 .67000 809 .04500 884 .42000 959 .79500 1034 .17000
585 .92500 660 .30000 735 .67500 810 .05000 885 .42500 960 .80000 1035 .17500
586 .93000 661 .30500 736 .68000 811 .05500 886 .43000 961 .80500 1036 .18000
587 .93500 662 .31000 737 .68500 812 .06000 887 .43500 962 .81000 1037 .18500
588 .94000 663 .31500 738 .69000 813 .06500 888 .44000 963 .81500 1038 .19000
589 .94500 664 .32000 739 .69500 814 .07000 889 .44500 964 .82000 1039 .19500
590 .95000 665 .32500 740 .70000 815 .07500 890 .45000 965 .82500 1040 .20000
591 .95500 666 .33000 741 .70500 816 .08000 891 .45500 966 .83000 1041 .20500
592 .96000 667 .33500 742 .71000 817 .08500 892 .46000 967 .83500 1042 .21000
593 .96500 668 .34000 743 .71500 818 .09000 893 .46500 968 .84000 1043 .21500
594 .97000 669 .34500 744 .72000 819 .09500 894 .47000 969 .84500 1044 .22000
595 .97500 670 .35000 745 .72500 820 .10000 895 .47500 970 .85000 1045 .22500
596 .98000 671 .35500 746 .73000 821 .10500 896 .48000 971 .85500 1046 .23000
597 .98500 672 .36000 747 .73500 822 .11000 897 .48500 972 .86000 1047 .23500
598 .99000 673 .36500 748 .74000 823 .11500 898 .49000 973 .86500 1048 .24000
599 .99500 674 .37000 749 .74500 824 .12000 899 .49500 974 .87000 1049 .24500