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
3-4
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
VT-3/160
Channel
Designation
Table:
150
to
174
MHz,
5
kHz
Increments
(con
tinued)
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)
1575 157.87500 1650 158.25000 1725 158.62500 1800 159.00000 1875 159.37500 1950 159.75000 2025 160.12500
1576 .88000 1651 .25500 1726 .63000 1801 .00500 1876 .38000 1951 .75500 2026 .13000
1577 .88500 1652 .26000 1727 .63500 1802 .01000 1877 .38500 1952 .76000 2027 .13500
1578 .89000 1653 .26500 1728 .64000 1803 .01500 1878 .39000 1953
.
76500 2028 .14000
1579 .89500 1654 .27000 1729 .64500 1804 .02000 1879 .39500 1954 .77000 2029 .14500
1580 .90000 1655 .27500 1730 .65000 1805 .02500 1880 .40000 1955 .77500 2030 .15000
1581 .90500 1656 .28000 1731 .65500 1806 .03000 1881 .40500 1956 .7800
0
2031 .15500
1582 .91000 1657 .28500 1732 .66000 1807 .03500 1882 .41000 1957 .78500 2032 .16000
1583 .91500 1658 .29000 1733 .66500 1808 .04000 1883 .41500 1958 .79000 2033 .16500
1584 .92000 1659 .29500 1734 .67000 1809 .04500 1884 .42000 1959 .79500
20 34
.17000
1585 .92500 1660 .30000 1735 .67500 1810 .05000 1885 .42500 1960 .80000 2035 .17500
1586 .93000 1661 .30500 1736 .68000 1811 .05500 1886 .43000 1961 .80500 2036 .18000
1587 .93500 1662 .31000 1737 .68500 1812 .06000 1887 .43500 1962 .81000 2037
.
18500
1588 .94000 1663 .31500 1738 .69000 1813 .06500 1888 .44000 1963 .81500 2038 .19000
1589 .94500 1664 .32000 1739 .69500 1814 .07000 1889 .44500 1964 .82000 2039 .19500
1590 .95000 1665 .32500 1740 .70000 1815 .07500 1890 .45000 1965 .82500 2040 .2000
0
1591 .95500 1666 .33000 1741 .70500 1816 .08000 1891 .45500 1966 .83000 2041 .20500
1592 .96000 1667 .33500 1742 .71000 1817 .08500 1892 .46000 1967 .83500 2042 .21000
1593 .96500 1668 .34000 1743 .71500 1818 .09000 1893 .46500 1968 .84000 2043 .21500
1594 .97000 1669 .34500 1744 .72000 1819 .09500 1894 .47000 1969 .84500 2044 .22000
1595 .97500 1670 .35000 1745 .72500 1820 .10000 1895 .47500 1970 .85000 2045 .22500
1596 .98000 1671 .35500 1746 .73000 1821 .10500 1896 .48000 1971 .85500 2046 .23000
1597
.
98500 1672 .36000 1747 .73500 1822 .11000 1897 .48500 1972 .86000 2047 .23500
1598 .99000 1673 .36500 1748 .74000 1823 .11500 1898 .49000 1973 .86500 2048 .24000
1599 .99500 1674 .37000 1749 .74500 1824 .12000 1899 .49500 1974 .87000 2049 .24500
1600 158.00000 1675 .37500 1750 158.75000 1825 .12500 1900 159.50000 1975 .87500 2050 160.25000
1601 .00500 1676 .38000 1751 .75500 1826 .13000 1901 .50500 1976 .88000 2051 .25500
1602 .01000 1677 .38500 1752 .76000 1827 .13500 1902 .51000 1977 .88500 2052 .26000
1603 .01500 1678 .39000 1753 .76500 1828 .14000 1903 .51500 1978 .89000 2053 .26500
1604 .02000 1679 .39500 1754 .77000 1829 .14500 1904 .52000 1979 .89500 2054 .27000
1605 .02500 1680 .40000 1755 .77500 1830 .15000 1905 .52500 1980 .90000 2055 .27500
1606
.
03000 1681 .40500 1756 .78000 1831 .15500 1906 .53000 1981 .90500 2056 .28000
1607 .03500 1682 .41000 1757 .78500 1832 .16000 1907 .53500 1982 .91000 2057 .28500
1608 .04000 1683 .41500 1758 .79000 1833 .16500 1908 .54000 1983 .91500 2058 .29000
1609 .0450
0
1684 .42000 1759 .79500 1834 .17000 1909 .54500 1984 .92000 2059 .29500
1610 .05000 1685 .42500 1760 .80000 1835 .17500 1910 .55000 1985 .92500 2060 .30000
1611 .05500 1686 .43000 1761 .80500 1836 .18000 1911 .55500 1986 .93000 2061 .30500
1612 .06000
16 87
.43500 1762 .81000 1837 .18500 1912 .56000 1987 .93500 2062 .31000
1613 .06500 1688 .44000 1763 .81500 1838 .19000 1913 .56500 1988 .94000 2063 .31500
1614 .07000 1689 .44500 1764 .82000 1839 .19500 1914 .57000 1989 .94500 2064 .32000
1615 .07500 1690
.
45000 1765 .82500 1840 .20000 1915 .57500 1990 .95000 2065 .32500
1616 .08000 1691 .45500 1766 .83000 1841 .20500 1916 .58000 1991 .95500 2066 .33000
1617 .08500 1692 .46000 1767 .83500 1842 .21000 1917 .58500 1992 .96000 2067 .33500
1618 .09000 1693 .4650
0
1768 .84000 1843 .21500 1918 .59000 1993 .96500 2068 .34000
1619 .09500 1694 .47000 1769 .84500 1844 .22000 1919 .59500 1994 .97000 2069 .34500
1620 .10000 1695 .47500 1770 .85000 1845 .22500 1920 .60000 1995 .97500 2070 .35000
1621 .10500 1696 .48000
17 71
.85500 1846 .23000 1921 .60500 1996 .98000 2071 .35500
1622 .11000 1697 .48500 1772 .86000 1847 .23500 1922 .61000 1997 .98500 2072 .36000
1623 .11500 1698 .49000 1773 .86500 1848 .24000 1923 .61500 1998 .99000 2073 .36500
1624 .12000 1699 .49500 1774
.
87000 1849 .24500 1924 .62000 1999 .99500 2074 .37000
1625 .12500 1700 158.50000 1775 .87500 1850 159.25000 1925 .62500 2000 160.00000 2075 .37500
1626 .13000 1701 .50500 1776 .88000 1851 .25500 1926 .63000 2001 .00500 2076 .38000
1627 .13500 1702 .51000
1
777 .88500 1852 .26000 1927 .63500 2002 .01000 2077 .38500
1628 .14000 1703 .51500 1778 .89000 1853 .26500 1928 .64000 2003 .01500 2078 .39000
1629 .14500 1704 .52000 1779 .89500 1854 .27000 1929 .64500 2004 .02000 2079 .39500
1630 .15000 1705 .52500 1780 .90000 1855 .27500 1930 .65000 2005 .02500 2080 .40000
1631 .15500 1706 .53000 1781 .90500 1856 .28000 1931 .65500 2006 .03000 2081 .40500
1632 .16000 1707 .53500 1782 .91000 1857 .28500 1932 .66000 2007 .03500 2082 .41000
1633 .16500 1708 .54000 1783 .915
00
1858 .29000 1933 .66500 2008 .04000 2083 .41500
1634 .17000 1709 .54500 1784 .92000 1859 .29500 1934 .67000 2009 .04500 2084 .42000
1635 .17500 1710 .55000 1785 .92500 1860 .30000 1935 .67500 2010 .05000 2085 .42500
1636 .18000 1711 .55500 1786 .93000
1
861 .30500 1936 .68000 2011 .05500 2086 .43000
1637 .18500 1712 .56000 1787 .93500 1862 .31000 1937 .68500 2012 .06000 2087 .43500
1638 .19000 1713 .56500 1788 .94000 1863 .31500 1938 .69000 2013 .06500 2088 .44000
1639 .19500 1714 .57000 1789 .94500 1864 .32000 1939 .69500 2014 .07000 2089 .44500
1640 .20000 1715 .57500 1790 .95000 1865 .32500 1940 .70000 2015 .07500 2090 .45000
1641 .20500 1716 .58000 1791 .95500 1866 .33000 1941 .70500 2016 .08000 2091 .45500
1642 .21000 1717 .58500 1792 .96000 1867 .335
00
1942 .71000 2017 .08500 2092 .46000
1643 .21500 1718 .59000 1793 .96500 1868 .34000 1943 .71500 2018 .09000 2093 .46500
1644 .22000 1719 .59500 1794 .97000 1869 .34500 1944 .72000 2019 .09500 2094 .47000
1645 .22500 1720 .60000 1795 .97500 1870 .35000
1
945 .72500 2020 .10000 2095 .47500
1646 .23000 1721 .60500 1796 .98000 1871 .35500 1946 .73000 2021 .10500 2096 .48000
1647 .23500 1722 .61000 1797 .98500 1872 .36000 1947 .73500 2022 .11000 2097 .48500
1648 .24000 1723 .61500 1798 .99000 1873 .36500 1948 .74000 2023 .11500 2098 .49000
1649 .24500 1724 .62000 1799 .99500 1874 .37000 1949 .74500 2024 .12000 2099 .49500