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
4-6
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
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)
7625 166.40625 7700 166.87500 7775 167.34375 7850 167.81250 7925 168.28125 8000 168.75000 8075 169.21875
7626 .41250 7701 .88125 7776 .35000 7851 .81875 7926 .28750 8001 .75625 8076 .22500
7627 .41875 7702 .88750 7777 .35625 7852 .82500 7927 .29375 8002 .76250 8077 .23125
7628 .42500 7703 .89375 7778 .36250 7853 .83125 7928 .30000 8003 .76875 8078 .23750
7629 .43125 7704 .90000 7779 .36875 7854 .83750 7929 .30625 8004 .77500 8079 .24375
7630 .43750 7705 .90625 7780 .37500 7855 .84375 7930 .31250 8005 .78125 8080 169.25000
7631 .44375 7706 .91250 7781 .38125 7856 .85000 7931 .31875 8006 .78750 8081 .25625
7632 .45000 7707 .91875 7782 .38750 7857 .85625 7932 .32500 8007 .79375 8082 .26250
7633 .45625 7708 .92500 7783 .39375 7858 .86250 7933 .33125 8008 .800
00
8083 .26875
7634 .46250 7709 .93125 7784 .40000 7859 .86875 7934 .33750 8009 .80625 8084 .27500
7635 .46875 7710 .93750 7785 .40625 7860 .87500 7935 .34375 8010 .81250 8085 .28125
7636 .47500 7711 .94375 7786 .41250 7861 .88125 7936 .35000 8011 .81875
8
086 .28750
7637 .48125 7712 .95000 7787 .41875 7862 .88750 7937 .35625 8012 .82500 8087 .29375
7638 .48750 7713 .95625 7788 .42500 7863 .89375 7938 .36250 8013 .83125 8088 .30000
7639 .49375 7714 .96250 7789 .43125 7864 .90000 7939 .36875 8014 .83750 8089 .30625
7640 166.50000 7715 .96875 7790 .43750 7865 .90625 7940 .37500 8015 .84375 8090 .31250
7641 .50625 7716 .97500 7791 .44375 7866 .91250 7941 .38125 8016 .85000 8091 .31875
7642 .51250 7717 .98125 7792 .45000 7867 .91875 7942 .38750 8017 .85625 8092
.
32500
7643 .51875 7718 .98750 7793 .45625 7868 .92500 7943 .39375 8018 .86250 8093 .33125
7644 .52500 7719 .99375 7794 .46250 7869 .93125 7944 .40000 8019 .86875 8094 .33750
7645 .53125 7720 167.00000 7795 .46875 7870 .93750 7945 .40625 8020 .87500 8095
.3
4375
7646 .53750 7721 .00625 7796 .47500 7871 .94375 7946 .41250 8021 .88125 8096 .35000
7647 .54375 7722 .01250 7797 .48125 7872 .95000 7947 .41875 8022 .88750 8097 .35625
7648 .55000 7723 .01875 7798 .48750 7873 .95625 7948 .42500 8023 .89375 8098 .36250
7649 .55625 7724 .02500 7799 .49375 7874 .96250 7949 .43125 8024 .90000 8099 .36875
7650 .56250 7725 .03125 7800 167.50000 7875 .96875 7950 .43750 8025 .90625 8100 .37500
7651 .56875 7726 .03750 7801 .50625 7876 .97500 7951 .44375 8026 .91250 8101 .38125
7652 .57500 7727 .04375 7802 .51250 7877 .98125 7952 .45000 8027 .91875 8102 .38750
7653 .58125 7728 .05000 7803 .51875 7878 .98750 7953 .45625 8028 .92500 8103 .39375
7654 .58750 7729 .05625 7804 .52500 7879 .99375 7954 .46250 8029 .93125 8104 .40000
7655 .59375 7730 .06250 7805 .53125 7880 168.00000 7955 .46875 8030 .93750 8105 .40625
7656 .60000 7731 .06875 7806 .53750 7881 .00625 7956 .47500 8031 .94375 8106 .41250
7657 .60625 7732 .07500 7807 .54375 7882 .01250 7957 .48125 8032 .95000 8107 .41875
7658 .61250 7733 .08125 7808 .55000 7883 .01875 7958 .48750 8033 .95625 8108 .42500
7659 .61875 7734 .08750 7809 .55625 7884 .02500 7959 .49375 8034 .96250 8109 .43125
7660 .62500 7735 .09375 7810 .56250 7885 .03125 7960 168.50000 8035 .96875 8110 .43750
7661
.
63125 7736 .10000 7811 .56875 7886 .03750 7961 .50625 8036 .97500 8111 .44375
7662 .63750 7737 .10625 7812 .57500 7887 .04375 7962 .51250 8037 .98125 8112 .45000
7663 .64375 7738 .11250 7813 .58125 7888 .05000 7963 .51875 8038 .98750 8113 .45625
7664 .6500
0
7739 .11875 7814 .58750 7889 .05625 7964 .52500 8039 .99375 8114 .46250
7665 .65625 7740 .12500 7815 .59375 7890 .06250 7965 .53125 8040 169.00000 8115 .46875
7666 .66250 7741 .13125 7816 .60000 7891 .06875 7966 .53750 8041 .00625 8116 .47500
7667 .66875 7742 .13750 7817 .60625 7892 .07500 7967 .54375 8042 .01250 8117 .48125
7668 .67500 7743 .14375 7818 .61250 7893 .08125 7968 .55000 8043 .01875 8118 .48750
7669 .68125 7744 .15000 7819 .61875 7894 .08750 7969 .55625 8044 .02500 8119 .49375
7670 .68750 774
5
.15625 7820 .62500 7895 .09375 7970 .56250 8045 .03125 8120 169.50000
7671 .69375 7746 .16250 7821 .63125 7896 .10000 7971 .56875 8046 .03750 8121 .50625
7672 .70000 7747 .16875 7822 .63750 7897 .10625 7972 .57500 8047 .04375 8122 .51250
7673 .70625 7748 .17500 7823 .64375 7898 .11250 7973 .58125 8048 .05000 8123 .51875
7674 .71250 7749 .18125 7824 .65000 7899 .11875 7974 .58750 8049 .05625 8124 .52500
7675 .71875 7750 .18750 7825 .65625 7900 .12500 7975 .59375 8050 .06250 8125 .53125
7676 .72500 7751 .19375 7826 .66250 7901 .13125 7976 .60000 8051 .06875 8126 .53750
7677 .73125 7752 .20000 7827 .66875 7902 .13750 7977 .60625 8052 .07500 8127 .54375
7678 .73750 7753 .20625 7828 .67500 7903 .14375 7978 .61250 8053 .08125 8128 .55000
7679 .74375 7754 .21250 7829 .68125 7904 .15000 7979 .61875 8054 .08750 8129 .55625
7680 166.75000 7755 .21875 7830 .68750 7905 .15625 7980 .62500 8055 .09375 8130 .56250
7681 .75625 7756 .22500 7831 .69375 7906 .16250 7981 .63125 8056 .10000 8131 .56875
7682 .76250 7757 .23125
7
832 .70000 7907 .16875 7982 .63750 8057 .10625 8132 .57500
7683 .76875 7758 .23750 7833 .70625 7908 .17500 7983 .64375 8058 .11250 8133 .58125
7684 .77500 7759 .24375 7834 .71250 7909 .18125 7984 .65000 8059 .11875 8134 .58750
7685 .78125 7760 167.25000
78 35
.71875 7910 .18750 7985 .65625 8060 .12500 8135 .59375
7686 .78750 7761 .25625 7836 .72500 7911 .19375 7986 .66250 8061 .13125 8136 .60000
7687 .79375 7762 .26250 7837 .73125 7912 .20000 7987 .66875 8062 .13750 8137 .60625
7688 .80000 7763 .26875 7838
.
73750 7913 .20625 7988 .67500 8063 .14375 8138 .61250
7689 .80625 7764 .27500 7839 .74375 7914 .21250 7989 .68125 8064 .15000 8139 .61875
7690 .81250 7765 .28125 7840 167.75000 7915 .21875 7990 .68750 8065 .15625 8140 .62500
7691 .81875 7766 .28750 7841
.7
5625 7916 .22500 7991 .69375 8066 .16250 8141 .63125
7692 .82500 7767 .29375 7842 .76250 7917 .23125 7992 .70000 8067 .16875 8142 .63750
7693 .83125 7768 .30000 7843 .76875 7918 .23750 7993 .70625 8068 .17500 8143 .64375
7694 .83750 7769 .30625 7844 .77500 7919 .24375 7994 .71250 8069 .18125 8144 .65000
7695 .84375 7770 .31250 7845 .78125 7920 168.25000 7995 .71875 8070 .18750 8145 .65625
7696 .85000 7771 .31875 7846 .78750 7921 .25625 7996 .72500 8071 .19375 8146 .66250
7697 .85625 7772 .32500 7847 .79375 7922 .26250 7997 .73125 8072 .20000 8147 .66875
7698 .86250 7773 .33125 7848 .80000 7923 .26875 7998 .73750 8073 .20625 8148 .67500
7699 .86875 7774 .33750 7849 .80625 7924 .27500 7999 .74375 8074 .21250 8149 .68125