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
1-1
1. VT-3/140
Channe
l Designation
Table:
132-150MHz, 5kHz Increments
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)
800 132.00000 875 132.37500 950 132.75000 1025 133.12500 1100 133.50000 1175 133.87500 1250 134.25000
801 .00500 876 .38000 951 .75500 1026 .13000 1101 .50500 1176 .88000 1251 .25500
802 .01000 877 .38500 952 .76000 1027 .13500 1102 .51000 1177 .88500 1252 .26000
803 .01500 878 .39000 953 .76500
1
028 .14000 1103 .51500 1178 .89000 1253 .26500
804 .02000 879 .39500 954 .77000 1029 .14500 1104 .52000 1179 .89500 1254 .27000
805 .02500 880 .40000 955 .77500 1030 .15000 1105 .52500 1180 .90000 1255 .27500
806 .03000 881 .40500 956 .78000 1031 .15500
11 06
.53000 1181 .90500 1256 .28000
807 .03500 882 .41000 957 .78500 1032 .16000 1107 .53500 1182 .91000 1257 .28500
808 .04000 883 .41500 958 .79000 1033 .16500 1108 .54000 1183 .91500 1258 .29000
809 .04500 884 .42000 959 .79500 1034 .17000 1109 .54500 118
4
.92000 1259 .29500
810 .05000 885 .42500 960 .80000 1035 .17500 1110 .55000 1185 .92500 1260 .30000
811 .05500 886 .43000 961 .80500 1036 .18000 1111 .55500 1186 .93000 1261 .30500
812 .06000 887 .43500 962 .81000 1037 .18500 1112 .56000 1187 .93500 1262 .31000
813 .06500 888 .44000 963 .81500 1038 .19000 1113 .56500 1188 .94000 1263 .31500
814 .07000 889 .44500 964 .82000 1039 .19500 1114 .57000 1189 .94500 1264 .32000
815 .07500 890 .45000 965 .82500 1040 .20000 1115 .57500 1190 .95000 1265 .32500
816
.
08000 891 .45500 966 .83000 1041 .20500 1116 .58000 1191 .95500 1266 .33000
817 .08500 892 .46000 967 .83500 1042 .21000 1117 .58500 1192 .96000 1267 .33500
818 .09000 893 .46500 968 .84000 1043 .21500 1118 .59000 1193 .96500 1268 .34000
819 .09500 894 .47000 969 .84500 1044 .22000 1119 .59500 1194 .97000 1269 .34500
820 .10000 895 .47500 970 .85000 1045 .22500 1120 .60000 1195 .97500 1270 .35000
821 .10500 896 .48000 971 .85500 1046 .23000 1121 .60500 1196 .98000 1271 .35500
822 .11000 897 .48500 972 .8600
0
1047 .23500 1122 .61000 1197 .98500 1272 .36000
823 .11500 898 .49000 973 .86500 1048 .24000 1123 .61500 1198 .99000 1273 .36500
824 .12000 899 .49500 974 .87000 1049 .24500 1124 .62000 1199 .99500 1274 .37000
825 .12500 900 132.50000 975 .87500 1050 133.25000 1125 .62500 1200 134.00000 1275 .37500
826 .13000 901 .50500 976 .88000 1051 .25500 1126 .63000 1201 .00500 1276 .38000
827 .13500 902 .51000 977 .88500 1052 .26000 1127 .63500 1202 .01000 1277 .38500
828 .14000 903 .51500 978 .89000 1053 .26500 112
8
.64000 1203 .01500 1278 .39000
829 .14500 904 .52000 979 .89500 1054 .27000 1129 .64500 1204 .02000 1279 .39500
830 .15000 905 .52500 980 .90000 1055 .27500 1130 .65000 1205 .02500 1280 .40000
831 .15500 906 .53000 981 .90500 1056 .28000 1131 .65500 1206 .03000 1281 .40500
832 .16000 907 .53500 982 .91000 1057 .28500 1132 .66000 1207 .03500 1282 .41000
833 .16500 908 .54000 983 .91500 1058 .29000 1133 .66500 1208 .04000 1283 .41500
834 .17000 909 .54500 984 .92000 1059 .29500 1134 .67000 1209 .04500 1284 .42000
835 .17500 910 .55000 985 .92500 1060 .30000 1135 .67500 1210 .05000 1285 .42500
836 .18000 911 .55500 986 .93000 1061 .30500 1136 .68000 1211 .05500 1286 .43000
837 .18500 912 .56000 987 .93500 1062 .31000 1137 .68500 1212 .06000 1287 .43500
838
.1
9000 913 .56500 988 .94000 1063 .31500 1138 .69000 1213 .06500 1288 .44000
839 .19500 914 .57000 989 .94500 1064 .32000 1139 .69500 1214 .07000 1289 .44500
840 .20000 915 .57500 990 .95000 1065 .32500 1140 .70000 1215 .07500 1290 .45000
841 .20500 916 .580
00
991 .95500 1066 .33000 1141 .70500 1216 .08000 1291 .45500
842 .21000 917 .58500 992 .96000 1067 .33500 1142 .71000 1217 .08500 1292 .46000
843 .21500 918 .59000 993 .96500 1068 .34000 1143 .71500 1218 .09000 1293 .46500
844 .22000 919 .59500 994 .97000 1069 .34500 1144 .72000 1219 .09500 1294 .47000
845 .22500 920 .60000 995 .97500 1070 .35000 1145 .72500 1220 .10000 1295 .47500
846 .23000 921 .60500 996 .98000 1071 .35500 1146 .73000 1221 .10500 1296 .48000
847 .23500 922 .61000 997 .98500 1072 .36000 1147 .73500 1222 .11000 1297 .48500
848 .24000 923 .61500 998 .99000 1073 .36500 1148 .74000 1223 .11500 1298 .49000
849 .24500 924 .62000 999 .99500 1074 .37000 1149 .74500 1224 .12000 1299 .49500
850 132.25000 925 .62500 1000 133.00000 1075 .37500 1150
1
33.75000 1225 .12500 1300 134.50000
851 .25500 926 .63000 1001 .00500 1076 .38000 1151 .75500 1226 .13000 1301 .50500
852 .26000 927 .63500 1002 .01000 1077 .38500 1152 .76000 1227 .13500 1302 .51000
853 .26500 928 .64000 1003 .01500 1078 .39000 1153 .7650
0
1228 .14000 1303 .51500
854 .27000 929 .64500 1004 .02000 1079 .39500 1154 .77000 1229 .14500 1304 .52000
855 .27500 930 .65000 1005 .02500 1080 .40000 1155 .77500 1230 .15000 1305 .52500
856 .28000 931 .65500 1006 .03000 1081 .40500 1156 .78000 1231 .15500 1306 .53000
857 .28500 932 .66000 1007 .03500 1082 .41000 1157 .78500 1232 .16000 1307 .53500
858 .29000 933 .66500 1008 .04000 1083 .41500 1158 .79000 1233 .16500 1308 .54000
859 .29500 934 .67000 1009 .04500 1084 .42000 1159 .79500 1234 .17000 1309
.
54500
860 .30000 935 .67500 1010 .05000 1085 .42500 1160 .80000 1235 .17500 1310 .55000
861 .30500 936 .68000 1011 .05500 1086 .43000 1161 .80500 1236 .18000 1311 .55500
862 .31000 937 .68500 1012 .06000 1087 .43500 1162 .81000 1237 .18500 1312 .56000
863 .31500 938 .69000 1013 .06500 1088 .44000 1163 .81500 1238 .19000 1313 .56500
864 .32000 939 .69500 1014 .07000 1089 .44500 1164 .82000 1239 .19500 1314 .57000
865 .32500 940 .70000 1015 .07500 1090 .45000 1165 .82500 1240 .20000 1315 .57500
866 .33000 941 .70500 1016 .08000 1091 .45500 1166 .83000 1241 .20500 1316 .58000
867 .33500 942 .71000 1017 .08500 1092 .46000 1167 .83500 1242 .21000 1317 .58500
868 .34000 943 .71500 1018 .09000 1093 .46500 1168 .84000 1243 .21500 1318 .59000
869 .34500 944 .72000
10 19
.09500 1094 .47000 1169 .84500 1244 .22000 1319 .59500
870 .35000 945 .72500 1020 .10000 1095 .47500 1170 .85000 1245 .22500 1320 .60000
871 .35500 946 .73000 1021 .10500 1096 .48000 1171 .85500 1246 .23000 1321 .60500
872 .36000 947 .73500 1022 .11000 1097 .48500 1172 .86000 1247 .23500 1322 .61000
873 .36500 948 .74000 1023 .11500 1098 .49000 1173 .86500 1248 .24000 1323 .61500
874 .37000 949 .74500 1024 .12000 1099 .49500 1174 .87000 1249 .24500 1324 .62000