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
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
2-3
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)
6690 138.56250 6765 139.03125 6840 139.50000 6915 139.96875 6990 140.43750 7065 140.90625 7140 141.37500
6691 .56875 6766 .03750
6
841 .50625 6916 .97500 6991 .44375 7066 .91250 7141 .38125
6692 .57500 6767 .04375 6842 .51250 6917 .98125 6992 .45000 7067 .91875 7142 .38750
6693 .58125 6768 .05000 6843 .51875 6918 .98750 6993 .45625 7068 .92500 7143 .39375
6694 .58750 6769 .05625 6844 .52500 6919 .99375 6994 .46250 7069 .93125 7144 .40000
6695 .59375 6770 .06250 6845 .53125 6920 140.00000 6995 .46875 7070 .93750 7145 .40625
6696 .60000 6771 .06875 6846 .53750 6921 .00625 6996 .47500 7071 .94375 7146 .41250
6697 .60625 6772 .07500 6847
.
54375 6922 .01250 6997 .48125 7072 .95000 7147 .41875
6698 .61250 6773 .08125 6848 .55000 6923 .01875 6998 .48750 7073 .95625 7148 .42500
6699 .61875 6774 .08750 6849 .55625 6924 .02500 6999 .49375 7074 .96250 7149 .43125
6700 .62500 6775 .09375 6850 .5625
0
6925 .03125 7000 140.50000 7075 .96875 7150 .43750
6701 .63125 6776 .10000 6851 .56875 6926 .03750 7001 .50625 7076 .97500 7151 .44375
6702 .63750 6777 .10625 6852 .57500 6927 .04375 7002 .51250 7077 .98125 7152 .45000
6703 .64375 6778 .11250 6853 .58125 6928 .05000 7003 .51875 7078 .98750 7153 .45625
6704 .65000 6779 .11875 6854 .58750 6929 .05625 7004 .52500 7079 .99375 7154 .46250
6705 .65625 6780 .12500 6855 .59375 6930 .06250 7005 .53125 7080 141.00000 7155 .46875
6706 .66250 6781 .13125 6856 .60000 6931 .06875 7006 .53750 7081 .00625 7156 .47500
6707 .66875 6782 .13750 6857 .60625 6932 .07500 7007 .54375 7082 .01250 7157 .48125
6708 .67500 6783 .14375 6858 .61250 6933 .08125 7008 .55000 7083 .01875 7158 .48750
6709 .68125 6784 .15000 6859 .61875 6934 .08750 7009 .55625 7084 .02500 7159 .49375
6710 .68750 6785 .15625 6860 .62500 6935 .09375 7010 .56250 7085 .03125 7160 141.50000
6711 .69375 6786 .16250 6861 .63125 6936 .10000 7011 .56875 7086 .03750 7161 .50625
6712 .70000 6787 .16875 6862 .63750 6937 .10625 7012 .57500 7087 .04375 7162 .51250
6713 .70625 6788 .17500 6863 .64375 6938 .11250 7013 .58125 7088 .05000 7163 .51875
6714 .71250 6789 .18125 6864 .65000 6939 .11875 7014 .58750 7089 .05625 7164 .52500
6715 .71875 6790 .18750 6865 .65625 6940 .125
00
7015 .59375 7090 .06250 7165 .53125
6716 .72500 6791 .19375 6866 .66250 6941 .13125 7016 .60000 7091 .06875 7166 .53750
6717 .73125 6792 .20000 6867 .66875 6942 .13750 7017 .60625 7092 .07500 7167 .54375
6718 .73750 6793 .20625 6868 .67500 6943 .14375
7
018 .61250 7093 .08125 7168 .55000
6719 .74375 6794 .21250 6869 .68125 6944 .15000 7019 .61875 7094 .08750 7169 .55625
6720 138.75000 6795 .21875 6870 .68750 6945 .15625 7020 .62500 7095 .09375 7170 .56250
6721 .75625 6796 .22500 6871 .69375 6946 .16250
70 21
.63125 7096 .10000 7171 .56875
6722 .76250 6797 .23125 6872 .70000 6947 .16875 7022 .63750 7097 .10625 7172 .57500
6723 .76875 6798 .23750 6873 .70625 6948 .17500 7023 .64375 7098 .11250 7173 .58125
6724 .77500 6799 .24375 6874 .71250 6949 .18125 7024
.
65000 7099 .11875 7174 .58750
6725 .78125 6800 139.25000 6875 .71875 6950 .18750 7025 .65625 7100 .12500 7175 .59375
6726 .78750 6801 .25625 6876 .72500 6951 .19375 7026 .66250 7101 .13125 7176 .60000
6727 .79375 6802 .26250 6877 .73125 6952 .20000 7027
.6
6875 7102 .13750 7177 .60625
6728 .80000 6803 .26875 6878 .73750 6953 .20625 7028 .67500 7103 .14375 7178 .61250
6729 .80625 6804 .27500 6879 .74375 6954 .21250 7029 .68125 7104 .15000 7179 .61875
6730 .81250 6805 .28125 6880 139.75000 6955 .21875 7030 .68750 7105 .15625 7180 .62500
6731 .81875 6806 .28750 6881 .75625 6956 .22500 7031 .69375 7106 .16250 7181 .63125
6732 .82500 6807 .29375 6882 .76250 6957 .23125 7032 .70000 7107 .16875 7182 .63750
6733 .83125 6808 .30000 6883 .76875 6958 .23750 7033 .70625 7108 .17500 7183 .64375
6734 .83750 6809 .30625 6884 .77500 6959 .24375 7034 .71250 7109 .18125 7184 .65000
6735 .84375 6810 .31250 6885 .78125 6960 140.25000 7035 .71875 7110 .18750 7185 .65625
6736 .85000 6811 .31875 6886 .78750 6961 .25625 7036 .72500
7
111 .19375 7186 .66250
6737 .85625 6812 .32500 6887 .79375 6962 .26250 7037 .73125 7112 .20000 7187 .66875
6738 .86250 6813 .33125 6888 .80000 6963 .26875 7038 .73750 7113 .20625 7188 .67500
6739 .86875 6814 .33750 6889 .80625 6964 .27500 7039 .74375 7114 .21250 7189 .68125
6740 .87500 6815 .34375 6890 .81250 6965 .28125 7040 140.75000 7115 .21875 7190 .68750
6741 .88125 6816 .35000 6891 .81875 6966 .28750 7041 .75625 7116 .22500 7191 .69375
6742 .88750 6817 .35625 6892 .82500 6967 .29375 7042 .76250 7117
.
23125 7192 .70000
6743 .89375 6818 .36250 6893 .83125 6968 .30000 7043 .76875 7118 .23750 7193 .70625
6744 .90000 6819 .36875 6894 .83750 6969 .30625 7044 .77500 7119 .24375 7194 .71250
6745 .90625 6820 .37500 6895 .84375 6970 .31250 7045 .78125 7120 141.25000 7195 .71875
6746 .91250 6821 .38125 6896 .85000 6971 .31875 7046 .78750 7121 .25625 7196 .72500
6747 .91875 6822 .38750 6897 .85625 6972 .32500 7047 .79375 7122 .26250 7197 .73125
6748 .92500 6823 .39375 6898 .86250 6973 .33125 7048 .80000 7123 .26875 7198 .73750
6749 .93125 6824 .40000 6899 .86875 6974 .33750 7049 .80625 7124 .27500 7199 .74375
6750 .93750 6825 .40625 6900 .87500 6975 .34375 7050 .81250 7125 .28125 7200 141.75000
6751 .94375 6826 .41250 6901 .88125 6976 .35000 7051 .81875 7126 .28750 7201 .75625
6752 .95000 6827 .41875 6902 .88750 6977 .35625 7052 .82500 7127 .29375 7202 .76250
6753 .95625 6828 .42500 6903 .89375 6978 .36250 7053 .83125 7128 .30000 7203 .76875
6754 .96250 6829 .43125 6904 .90000 6979 .36875 7054 .83750 7129 .30625 7204 .77500
6755 .96875 6830 .43750 6905 .90625 6980 .37500 7055 .84375 7130 .31250 7205 .78125
6756 .97500 6831 .44375 6906 .91250 6981 .38125 7056 .85000 7131 .31875 7206 .78750
6757 .98125 6832 .45000 6907 .91875 6982 .38750 7057 .85625 7132 .32500 7207 .79375
6758 .98750 6833 .45625 6908 .92500 6983 .39375 7058 .86250 7133 .33125 7208 .80000
6759 .99375 6834 .46250 6909 .93125 6984 .40000 7059 .86875 7134 .33750 7209 .80625
6760 139.00000 6835 .46875 6910 .93750 6985 .40625 7060 .87500 7135 .34375 7210 .812
50
6761 .00625 6836 .47500 6911 .94375 6986 .41250 7061 .88125 7136 .35000 7211 .81875
6762 .01250 6837 .48125 6912 .95000 6987 .41875 7062 .88750 7137 .35625 7212 .82500
6763 .01875 6838 .48750 6913 .95625 6988 .42500 7063 .89375 7138 .36250 7213 .83125
6764 .02500 6839 .49375 6914 .96250 6989 .43125 7064 .90000 7139 .36875 7214 .83750