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
1-2
VHF Transmitter Chan
nel Designation Tables VT-3 132 - 174 MHz
VT-3/140
Channel
Designation
Table:
132
to
150
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)
1325 134.62500 1400 135.00000 1475 135.37500 1550
13
5.75000 1625 136.12500 1700 136.50000 1775 136.87500
1326 .63000 1401 .00500 1476 .38000 1551 .75500 1626 .13000 1701 .50500 1776 .88000
1327 .63500 1402 .01000 1477 .38500 1552 .76000 1627 .13500 1702 .51000 1777 .88500
1328 .64000 1403 .01500 1478 .39000 1553 .76500 1628 .14000 1703 .51500 1778 .89000
1329 .64500 1404 .02000 1479 .39500 1554 .77000 1629 .14500 1704 .52000 1779 .89500
1330 .65000 1405 .02500 1480 .40000 1555 .77500 1630 .15000 1705 .52500 1780 .90000
1331 .65500 1406 .03000 1481 .40500 155
6
.78000 1631 .15500 1706 .53000 1781 .90500
1332 .66000 1407 .03500 1482 .41000 1557 .78500 1632 .16000 1707 .53500 1782 .91000
1333 .66500 1408 .04000 1483 .41500 1558 .79000 1633 .16500 1708 .54000 1783 .91500
1334 .67000 1409 .04500 1484 .42000 1559
.7
9500 1634 .17000 1709 .54500 1784 .92000
1335 .67500 1410 .05000 1485 .42500 1560 .80000 1635 .17500 1710 .55000 1785 .92500
1336 .68000 1411 .05500 1486 .43000 1561 .80500 1636 .18000 1711 .55500 1786 .93000
1337 .68500 1412 .06000 1487 .43500 1562 .81000 1637 .18500 1712 .56000 1787 .93500
1338 .69000 1413 .06500 1488 .44000 1563 .81500 1638 .19000 1713 .56500 1788 .94000
1339 .69500 1414 .07000 1489 .44500 1564 .82000 1639 .19500 1714 .57000 1789 .94500
1340 .70000 1415 .07500 1490 .45000 1565 .82500 164
0
.20000 1715 .57500 1790 .95000
1341 .70500 1416 .08000 1491 .45500 1566 .83000 1641 .20500 1716 .58000 1791 .95500
1342 .71000 1417 .08500 1492 .46000 1567 .83500 1642 .21000 1717 .58500 1792 .96000
1343 .71500 1418 .09000 1493 .46500 1568 .84000 1643
.2
1500 1718 .59000 1793 .96500
1344 .72000 1419 .09500 1494 .47000 1569 .84500 1644 .22000 1719 .59500 1794 .97000
1345 .72500 1420 .10000 1495 .47500 1570 .85000 1645 .22500 1720 .60000 1795 .97500
1346 .73000 1421 .10500 1496 .48000 1571 .85500 1646 .23000 1721 .60500 1796 .98000
1347 .73500 1422 .11000 1497 .48500 1572 .86000 1647 .23500 1722 .61000 1797 .98500
1348 .74000 1423 .11500 1498 .49000 1573 .86500 1648 .24000 1723 .61500 1798 .99000
1349 .74500 1424 .12000 1499 .49500 1574 .87000 1649 .24500 172
4
.62000 1799 .99500
1350 134.75000 1425 .12500 1500 135.50000 1575 .87500 1650 136.25000 1725 .62500 1800 137.00000
1351 .75500 1426 .13000 1501 .50500 1576 .88000 1651 .25500 1726 .63000 1801 .00500
1352 .76000 1427 .13500 1502 .51000 1577 .88500 1652
.2
6000 1727 .63500 1802 .01000
1353 .76500 1428 .14000 1503 .51500 1578 .89000 1653 .26500 1728 .64000 1803 .01500
1354 .77000 1429 .14500 1504 .52000 1579 .89500 1654 .27000 1729 .64500 1804 .02000
1355 .77500 1430 .15000 1505 .52500 1580 .90000 1655 .27500 1730 .65000 1805 .02500
1356 .78000 1431 .15500 1506 .53000 1581 .90500 1656 .28000 1731 .65500 1806 .03000
1357 .78500 1432 .16000 1507 .53500 1582 .91000 1657 .28500 1732 .66000 1807 .03500
1358 .79000 1433 .16500 1508 .54000 1583 .91500 1658 .29000 173
3
.66500 1808 .04000
1359 .79500 1434 .17000 1509 .54500 1584 .92000 1659 .29500 1734 .67000 1809 .04500
1360 .80000 1435 .17500 1510 .55000 1585 .92500 1660 .30000 1735 .67500 1810 .05000
1361 .80500 1436 .18000 1511 .55500 1586 .93000 1661 .30500 1736
.6
8000 1811 .05500
1362 .81000 1437 .18500 1512 .56000 1587 .93500 1662 .31000 1737 .68500 1812 .06000
1363 .81500 1438 .19000 1513 .56500 1588 .94000 1663 .31500 1738 .69000 1813 .06500
1364 .82000 1439 .19500 1514 .57000 1589 .94500 1664 .32000 1739 .69500 1814 .07000
1365 .82500 1440 .20000 1515 .57500 1590 .95000 1665 .32500 1740 .70000 1815 .07500
1366 .83000 1441 .20500 1516 .58000 1591 .95500 1666 .33000 1741 .70500 1816 .08000
1367 .83500 1442 .21000 1517 .58500 1592 .96000 1667 .33500 1742 .71000 181
7
.08500
1368 .84000 1443 .21500 1518 .59000 1593 .96500 1668 .34000 1743 .71500 1818 .09000
1369 .84500 1444 .22000 1519 .59500 1594 .97000 1669 .34500 1744 .72000 1819 .09500
1370 .85000 1445 .22500 1520 .60000 1595 .97500 1670 .35000 1745 .72500 1820
.1
0000
1371 .85500 1446 .23000 1521 .60500 1596 .98000 1671 .35500 1746 .73000 1821 .10500
1372 .86000 1447 .23500 1522 .61000 1597 .98500 1672 .36000 1747 .73500 1822 .11000
1373 .86500 1448 .24000 1523 .61500 1598 .99000 1673 .36500 1748 .74000 1823 .11500
1374 .87000 1449 .24500 1524 .62000 1599 .99500 1674 .37000 1749 .74500 1824 .12000
1375 .87500 1450 135.25000 1525 .62500 1600 136.00000 1675 .37500 1750 136.75000 1825 .12500
1376 .88000 1451 .25500 1526 .63000 1601 .00500 1676 .38000 1751 .75500 1826
.
13000
1377 .88500 1452 .26000 1527 .63500 1602 .01000 1677 .38500 1752 .76000 1827 .13500
1378 .89000 1453 .26500 1528 .64000 1603 .01500 1678 .39000 1753 .76500 1828 .14000
1379 .89500 1454 .27000 1529 .64500 1604 .02000 1679 .39500 1754 .77000 1829 .1450
0
1380 .90000 1455 .27500 1530 .65000 1605 .02500 1680 .40000 1755 .77500 1830 .15000
1381 .90500 1456 .28000 1531 .65500 1606 .03000 1681 .40500 1756 .78000 1831 .15500
1382 .91000 1457 .28500 1532 .66000 1607 .03500 1682 .41000 1757 .78500 1832 .16000
1383 .91500 1458 .29000 1533 .66500 1608 .04000 1683 .41500 1758 .79000 1833 .16500
1384 .92000 1459 .29500 1534 .67000 1609 .04500 1684 .42000 1759 .79500 1834 .17000
1385 .92500 1460 .30000 1535 .67500 1610 .05000 1685 .42500 1760 .80000 1835 .17500
1386
.
93000 1461 .30500 1536 .68000 1611 .05500 1686 .43000 1761 .80500 1836 .18000
1387 .93500 1462 .31000 1537 .68500 1612 .06000 1687 .43500 1762 .81000 1837 .18500
1388 .94000 1463 .31500 1538 .69000 1613 .06500 1688 .44000 1763 .81500 1838 .19000
1389 .9450
0
1464 .32000 1539 .69500 1614 .07000 1689 .44500 1764 .82000 1839 .19500
1390 .95000 1465 .32500 1540 .70000 1615 .07500 1690 .45000 1765 .82500 1840 .20000
1391 .95500 1466 .33000 1541 .70500 1616 .08000 1691 .45500 1766 .83000 1841 .20500
1392 .96000
14 67
.33500 1542 .71000 1617 .08500 1692 .46000 1767 .83500 1842 .21000
1393 .96500 1468 .34000 1543 .71500 1618 .09000 1693 .46500 1768 .84000 1843 .21500
1394 .97000 1469 .34500 1544 .72000 1619 .09500 1694 .47000 1769 .84500 1844 .22000
1395 .97500 1470
.
35000 1545 .72500 1620 .10000 1695 .47500 1770 .85000 1845 .22500
1396 .98000 1471 .35500 1546 .73000 1621 .10500 1696 .48000 1771 .85500 1846 .23000
1397 .98500 1472 .36000 1547 .73500 1622 .11000 1697 .48500 1772 .86000 1847 .23500
1398 .99000 1473 .3650
0
1548 .74000 1623 .11500 1698 .49000 1773 .86500 1848 .24000
1399 .99500 1474 .37000 1549 .74500 1624 .12000 1699 .49500 1774 .87000 1849 .24500