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
3-3
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)
1050 155.25000
11 25
155.62500 1200 156.00000 1275 156.37500 1350 156.75000 1425 157.12500 1500 157.50000
1051 .25500 1126 .63000 1201 .00500 1276 .38000 1351 .75500 1426 .13000 1501 .50500
1052 .26000 1127 .63500 1202 .01000 1277 .38500 1352 .76000 1427 .13500 1502 .51000
1053 .26500 1128 .64000 1203 .01500 1278 .39000 1353 .76500 1428 .14000 1503 .51500
1054 .27000 1129 .64500 1204 .02000 1279 .39500 1354 .77000 1429 .14500 1504 .52000
1055 .27500 1130 .65000 1205 .02500 1280 .40000 1355 .77500 1430 .15000 1505 .52500
1056 .28000 1131 .65500 1206 .03000 1281 .40500 1356 .78000 1431 .15500 1506 .53000
1057 .28500 1132 .66000 1207 .03500 1282 .41000 1357 .78500 1432 .16000 1507 .53500
1058 .29000 1133 .66500 1208 .04000 1283 .41500 1358 .79000 1433 .16500 1508 .54000
1059 .29500 1134 .67000 1209 .04500 1284 .42000 1359 .79500 1434 .17000 1509 .54500
1060 .30000 1135 .67500 1210 .05000 1285 .42500 1360 .80000 1435 .17500 1510 .55000
1061 .30500 1136 .68000 1211 .05500 1286 .43000 1361 .80500 1436 .18000 1511 .55500
1062 .31000 1137 .68500 1212 .06000 1287 .43500 1362 .81000 1437 .18500 1512 .56000
1063 .31500 1138 .69000 1213 .06500 1288 .44000 1363 .81500 1438 .19000 1513 .56500
1064 .32000 1139 .69500 1214 .07000 1289 .44500 1364 .82000 1439 .19500 1514 .57000
1065 .32500 1140 .70000 1215 .07500 1290 .45000 1365 .82500 1440 .20000 1515 .57500
1066 .33000 1141 .70500 1216 .08000 1291 .45500 1366 .83000 1441 .20500 1516 .58000
1067 .33500 1142 .71000 1217 .08500 1292 .46000 1367 .83500 1442 .21000 1517 .58500
1068 .34000 1143 .71500 1218 .09000 1293 .46500 1368 .84000 1443 .21500 1518 .59000
1069 .34500 1144 .72000 1219 .09500 1294 .47000 1369 .84500 1444 .22000 1519 .59500
1070 .35000 1145 .72500 1220 .10000 1295 .47500 1370 .85000 1445 .22500 1520 .60000
1071 .35500 1146 .73000 1221 .10500 1296 .48000 1371 .85500 1446 .23000 1521 .60500
1072 .36000 1147 .73500 1222 .11000 1297 .48500 1372 .86000 1447 .23500 1522 .61000
1073 .36500 1148 .74000 1223 .11500 1298 .49000 1373 .86500 1448 .24000 1523 .61500
1074 .37000 1149 .74500 1224 .12000 1299 .49500 1374 .87000 1449 .24500 1524 .62000
1075 .37500 1150 155.75000 1225 .12500 1300 156.50000 1375 .87500 1450 157.25000 1525 .62500
1076 .38000 1151 .75500 1226 .13000 1301 .50500 1376 .88000 1451 .25500 1526 .63000
1077 .38500 1152 .76000 1227 .13500 1302 .51000 1377 .88500 1452 .26000 1527 .63500
1078 .39000 1153 .76500 1228 .14000 1303 .51500 1378 .89000 1453 .26500 1528 .64000
1079 .39500 1154 .77000 1229 .14500 1304 .52000 1379 .89500 1454 .27000 1529 .64500
1080 .40000 1155 .77500 123
0
.15000 1305 .52500 1380 .90000 1455 .27500 1530 .65000
1081 .40500 1156 .78000 1231 .15500 1306 .53000 1381 .90500 1456 .28000 1531 .65500
1082 .41000 1157 .78500 1232 .16000 1307 .53500 1382 .91000 1457 .28500 1532 .66000
1083 .41500 1158 .79000 1233
.1
6500 1308 .54000 1383 .91500 1458 .29000 1533 .66500
1084 .42000 1159 .79500 1234 .17000 1309 .54500 1384 .92000 1459 .29500 1534 .67000
1085 .42500 1160 .80000 1235 .17500 1310 .55000 1385 .92500 1460 .30000 1535 .67500
1086 .43000 1161 .80500 1236 .18000 1311 .55500 1386 .93000 1461 .30500 1536 .68000
1087 .43500 1162 .81000 1237 .18500 1312 .56000 1387 .93500 1462 .31000 1537 .68500
1088 .44000 1163 .81500 1238 .19000 1313 .56500 1388 .94000 1463 .31500 1538 .69000
1089 .44500 1164 .82000 1239 .19500 131
4
.57000 1389 .94500 1464 .32000 1539 .69500
1090 .45000 1165 .82500 1240 .20000 1315 .57500 1390 .95000 1465 .32500 1540 .70000
1091 .45500 1166 .83000 1241 .20500 1316 .58000 1391 .95500 1466 .33000 1541 .70500
1092 .46000 1167 .83500 1242 .21000 1317
.5
8500 1392 .96000 1467 .33500 1542 .71000
1093 .46500 1168 .84000 1243 .21500 1318 .59000 1393 .96500 1468 .34000 1543 .71500
1094 .47000 1169 .84500 1244 .22000 1319 .59500 1394 .97000 1469 .34500 1544 .72000
1095 .47500 1170 .85000 1245 .22500 1320 .60000 1395 .97500 1470 .35000 1545 .72500
1096 .48000 1171 .85500 1246 .23000 1321 .60500 1396 .98000 1471 .35500 1546 .73000
1097 .48500 1172 .86000 1247 .23500 1322 .61000 1397 .98500 1472 .36000 1547 .73500
1098 .49000 1173 .86500 1248 .24000 1323 .61500 139
8
.99000 1473 .36500 1548 .74000
1099 .49500 1174 .87000 1249 .24500 1324 .62000 1399 .99500 1474 .37000 1549 .74500
1100 155.50000 1175 .87500 1250 156.25000 1325 .62500 1400 157.00000 1475 .37500 1550 157.75000
1101 .50500 1176 .88000 1251 .25500 1326
.6
3000 1401 .00500 1476 .38000 1551 .75500
1102 .51000 1177 .88500 1252 .26000 1327 .63500 1402 .01000 1477 .38500 1552 .76000
1103 .51500 1178 .89000 1253 .26500 1328 .64000 1403 .01500 1478 .39000 1553 .76500
1104 .52000 1179 .89500 1254 .27000 1329 .64500 1404 .02000 1479 .39500 1554 .77000
1105 .52500 1180 .90000 1255 .27500 1330 .65000 1405 .02500 1480 .40000 1555 .77500
1106 .53000 1181 .90500 1256 .28000 1331 .65500 1406 .03000 1481 .40500 1556 .78000
1107 .53500 1182 .91000 1257 .28500 1332 .66000 140
7
.03500 1482 .41000 1557 .78500
1108 .54000 1183 .91500 1258 .29000 1333 .66500 1408 .04000 1483 .41500 1558 .79000
1109 .54500 1184 .92000 1259 .29500 1334 .67000 1409 .04500 1484 .42000 1559 .79500
1110 .55000 1185 .92500 1260 .30000 1335 .67500 1410
.0
5000 1485 .42500 1560 .80000
1111 .55500 1186 .93000 1261 .30500 1336 .68000 1411 .05500 1486 .43000 1561 .80500
1112 .56000 1187 .93500 1262 .31000 1337 .68500 1412 .06000 1487 .43500 1562 .81000
1113 .56500 1188 .94000 1263 .31500 1338 .69000 1413 .06500 1488 .44000 1563 .81500
1114 .57000 1189 .94500 1264 .32000 1339 .69500 1414 .07000 1489 .44500 1564 .82000
1115 .57500 1190 .95000 1265 .32500 1340 .70000 1415 .07500 1490 .45000 1565 .82500
1116 .58000 1191 .95500 1266 .33000 1341 .70500 1416 .08000 149
1
.45500 1566 .83000
1117 .58500 1192 .96000 1267 .33500 1342 .71000 1417 .08500 1492 .46000 1567 .83500
1118 .59000 1193 .96500 1268 .34000 1343 .71500 1418 .09000 1493 .46500 1568 .84000
1119 .59500 1194 .97000 1269 .34500 1344 .72000 1419 .09500 1494
.4
7000 1569 .84500
1120 .60000 1195 .97500 1270 .35000 1345 .72500 1420 .10000 1495 .47500 1570 .85000
1121 .60500 1196 .98000 1271 .35500 1346 .73000 1421 .10500 1496 .48000 1571 .85500
1122 .61000 1197 .98500 1272 .36000 1347 .73500 1422 .11000 1497 .48500 1572 .86000
1123 .61500 1198 .99000 1273 .36500 1348 .74000 1423 .11500 1498 .49000 1573 .86500
1124 .62000 1199 .99500 1274 .37000 1349 .74500 1424 .12000 1499 .49500 1574 .87000