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
2-5
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)
7740 145.12500 7815 145.59375 7890 146.06250 7965 146.53125 8040 147.00000 8115 147.46875 8190 147.93750
7741 .13125 7816 .60000 7891 .06875 7966 .53750 8041 .00625 8116 .47500 8191 .94375
7742 .13750 7817 .60625 7892 .07500
7
967 .54375 8042 .01250 8117 .48125 8192 .95000
7743 .14375 7818 .61250 7893 .08125 7968 .55000 8043 .01875 8118 .48750 8193 .95625
7744 .15000 7819 .61875 7894 .08750 7969 .55625 8044 .02500 8119 .49375 8194 .96250
7745 .15625 7820 .62500 7895 .09375 7970 .56250 8045 .03125 8120 147.50000 8195 .96875
7746 .16250 7821 .63125 7896 .10000 7971 .56875 8046 .03750 8121 .50625 8196 .97500
7747 .16875 7822 .63750 7897 .10625 7972 .57500 8047 .04375 8122 .51250 8197 .98125
7748 .17500 7823 .64375 7898 .11250 7973
.
58125 8048 .05000 8123 .51875 8198 .98750
7749 .18125 7824 .65000 7899 .11875 7974 .58750 8049 .05625 8124 .52500 8199 .99375
7750 .18750 7825 .65625 7900 .12500 7975 .59375 8050 .06250 8125 .53125 8200 148.00000
7751 .19375 7826 .66250 7901 .13125 7976
.6
0000 8051 .06875 8126 .53750 8201 .00625
7752 .20000 7827 .66875 7902 .13750 7977 .60625 8052 .07500 8127 .54375 8202 .01250
7753 .20625 7828 .67500 7903 .14375 7978 .61250 8053 .08125 8128 .55000 8203 .01875
7754 .21250 7829 .68125 7904 .15000 7979 .61875 8054 .08750 8129 .55625 8204 .02500
7755 .21875 7830 .68750 7905 .15625 7980 .62500 8055 .09375 8130 .56250 8205 .03125
7756 .22500 7831 .69375 7906 .16250 7981 .63125 8056 .10000 8131 .56875 8206 .03750
7757 .23125 7832 .70000 7907 .16875 7982 .63750 805
7
.10625 8132 .57500 8207 .04375
7758 .23750 7833 .70625 7908 .17500 7983 .64375 8058 .11250 8133 .58125 8208 .05000
7759 .24375 7834 .71250 7909 .18125 7984 .65000 8059 .11875 8134 .58750 8209 .05625
7760 145.25000 7835 .71875 7910 .18750 7985 .65625 8060 .12500 8135 .59375 8210 .06250
7761 .25625 7836 .72500 7911 .19375 7986 .66250 8061 .13125 8136 .60000 8211 .06875
7762 .26250 7837 .73125 7912 .20000 7987 .66875 8062 .13750 8137 .60625 8212 .07500
7763 .26875 7838 .73750 7913 .20625 7988 .67500 8063 .14375 8138 .61250 8213 .08125
7764 .27500 7839 .74375 7914 .21250 7989 .68125 8064 .15000 8139 .61875 8214 .08750
7765 .28125 7840 145.75000 7915 .21875 7990 .68750 8065 .15625 8140 .62500 8215 .09375
7766 .28750 7841 .75625 7916 .22500 7991 .69375 8066 .162
50
8141 .63125 8216 .10000
7767 .29375 7842 .76250 7917 .23125 7992 .70000 8067 .16875 8142 .63750 8217 .10625
7768 .30000 7843 .76875 7918 .23750 7993 .70625 8068 .17500 8143 .64375 8218 .11250
7769 .30625 7844 .77500 7919 .24375 7994 .71250 8069 .18125
8
144 .65000 8219 .11875
7770 .31250 7845 .78125 7920 146.25000 7995 .71875 8070 .18750 8145 .65625 8220 .12500
7771 .31875 7846 .78750 7921 .25625 7996 .72500 8071 .19375 8146 .66250 8221 .13125
7772 .32500 7847 .79375 7922 .26250 7997 .73125 8072 .20000
81 47
.66875 8222 .13750
7773 .33125 7848 .80000 7923 .26875 7998 .73750 8073 .20625 8148 .67500 8223 .14375
7774 .33750 7849 .80625 7924 .27500 7999 .74375 8074 .21250 8149 .68125 8224 .15000
7775 .34375 7850 .81250 7925 .28125 8000 146.75000 8075 .21875 815
0
.68750 8225 .15625
7776 .35000 7851 .81875 7926 .28750 8001 .75625 8076 .22500 8151 .69375 8226 .16250
7777 .35625 7852 .82500 7927 .29375 8002 .76250 8077 .23125 8152 .70000 8227 .16875
7778 .36250 7853 .83125 7928 .30000 8003 .76875 8078 .23750 8153
.7
0625 8228 .17500
7779 .36875 7854 .83750 7929 .30625 8004 .77500 8079 .24375 8154 .71250 8229 .18125
7780 .37500 7855 .84375 7930 .31250 8005 .78125 8080 147.25000 8155 .71875 8230 .18750
7781 .38125 7856 .85000 7931 .31875 8006 .78750 8081 .25625 8156 .72500 8231 .19375
7782 .38750 7857 .85625 7932 .32500 8007 .79375 8082 .26250 8157 .73125 8232 .20000
7783 .39375 7858 .86250 7933 .33125 8008 .80000 8083 .26875 8158 .73750 8233 .20625
7784 .40000 7859 .86875 7934 .33750 8009 .80625 8084 .27500 8159 .74375 8234 .21250
7785 .40625 7860 .87500 7935 .34375 8010 .81250 8085 .28125 8160 147.75000 8235 .21875
7786 .41250 7861 .88125 7936 .35000 8011 .81875 8086 .28750 8161 .75625 8236 .22500
7787 .41875 7862 .88750 7937 .35625 8012 .82500 8087 .29375 8162 .76250
8
237 .23125
7788 .42500 7863 .89375 7938 .36250 8013 .83125 8088 .30000 8163 .76875 8238 .23750
7789 .43125 7864 .90000 7939 .36875 8014 .83750 8089 .30625 8164 .77500 8239 .24375
7790 .43750 7865 .90625 7940 .37500 8015 .84375 8090 .31250 8165 .78125 8240 148.25000
7791 .44375 7866 .91250 7941 .38125 8016 .85000 8091 .31875 8166 .78750 8241 .25625
7792 .45000 7867 .91875 7942 .38750 8017 .85625 8092 .32500 8167 .79375 8242 .26250
7793 .45625 7868 .92500 7943 .39375 8018 .86250 8093 .33125 8168 .80000 8243
.
26875
7794 .46250 7869 .93125 7944 .40000 8019 .86875 8094 .33750 8169 .80625 8244 .27500
7795 .46875 7870 .93750 7945 .40625 8020 .87500 8095 .34375 8170 .81250 8245 .28125
7796 .47500 7871 .94375 7946 .41250 8021 .88125 8096 .35000 8171 .81875 8246 .2875
0
7797 .48125 7872 .95000 7947 .41875 8022 .88750 8097 .35625 8172 .82500 8247 .29375
7798 .48750 7873 .95625 7948 .42500 8023 .89375 8098 .36250 8173 .83125 8248 .30000
7799 .49375 7874 .96250 7949 .43125 8024 .90000 8099 .36875 8174 .83750 8249 .30625
7800 145.50000 7875 .96875 7950 .43750 8025 .90625 8100 .37500 8175 .84375 8250 .31250
7801 .50625 7876 .97500 7951 .44375 8026 .91250 8101 .38125 8176 .85000 8251 .31875
7802 .51250 7877 .98125 7952 .45000 8027 .91875 8102 .38750 8177 .85625 8252 .32500
7803 .51875 7878 .98750 7953 .45625 8028 .92500 8103 .39375 8178 .86250 8253 .33125
7804 .52500 7879 .99375 7954 .46250 8029 .93125 8104 .40000 8179 .86875 8254 .33750
7805 .53125 7880 146.00000 7955 .46875 8030 .93750 8105 .40625 8180 .87500 8255 .34375
7806 .53750 7881 .00625 7956 .47500 8031 .94375 8106 .41250 8181 .88125 8256 .35000
7807 .54375 7882 .01250 7957 .48125 8032 .95000 8107 .41875 8182 .88750 8257 .35625
7808 .55000 7883 .01875 7958 .48750 8033 .95625 8108 .42500 8183 .89375 8258 .36250
7809 .55625 7884 .02500 7959 .49375 8034 .96250 8109 .43125 8184 .90000 8259 .36875
7810 .56250 7885 .03125 7960 146.50000 8035 .96875 8110 .43750 8185 .90625 8260 .37500
7811 .56875 7886 .03750 7961 .50625 8036 .97500 8111 .44375 8186 .91250 8261 .38125
7812 .575
00
7887 .04375 7962 .51250 8037 .98125 8112 .45000 8187 .91875 8262 .38750
7813 .58125 7888 .05000 7963 .51875 8038 .98750 8113 .45625 8188 .92500 8263 .39375
7814 .58750 7889 .05625 7964 .52500 8039 .99375 8114 .46250 8189 .93125 8264 .40000