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
1-3
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)
1850 137.25000 1925 137.62500 2000 138.00000 2075 138.37500 2150 138.75000 2225 139.12500 2300 139.50000
1851 .25500
1
926 .63000 2001 .00500 2076 .38000 2151 .75500 2226 .13000 2301 .50500
1852 .26000 1927 .63500 2002 .01000 2077 .38500 2152 .76000 2227 .13500 2302 .51000
1853 .26500 1928 .64000 2003 .01500 2078 .39000 2153 .76500 2228 .14000 2303 .51500
1854 .27000 1929 .64500 2004 .02000 2079 .39500 2154 .77000 2229 .14500 2304 .52000
1855 .27500 1930 .65000 2005 .02500 2080 .40000 2155 .77500 2230 .15000 2305 .52500
1856 .28000 1931 .65500 2006 .03000 2081 .40500 2156 .78000 2231 .15500 2306 .53000
1857 .28500 1932 .660
00
2007 .03500 2082 .41000 2157 .78500 2232 .16000 2307 .53500
1858 .29000 1933 .66500 2008 .04000 2083 .41500 2158 .79000 2233 .16500 2308 .54000
1859 .29500 1934 .67000 2009 .04500 2084 .42000 2159 .79500 2234 .17000 2309 .54500
1860 .30000 1935 .67500
2
010 .05000 2085 .42500 2160 .80000 2235 .17500 2310 .55000
1861 .30500 1936 .68000 2011 .05500 2086 .43000 2161 .80500 2236 .18000 2311 .55500
1862 .31000 1937 .68500 2012 .06000 2087 .43500 2162 .81000 2237 .18500 2312 .56000
1863 .31500 1938 .69000 2013 .06500 2088 .44000 2163 .81500 2238 .19000 2313 .56500
1864 .32000 1939 .69500 2014 .07000 2089 .44500 2164 .82000 2239 .19500 2314 .57000
1865 .32500 1940 .70000 2015 .07500 2090 .45000 2165 .82500 2240 .20000 2315 .57500
1866 .33000 1941 .70500 2016 .080
00
2091 .45500 2166 .83000 2241 .20500 2316 .58000
1867 .33500 1942 .71000 2017 .08500 2092 .46000 2167 .83500 2242 .21000 2317 .58500
1868 .34000 1943 .71500 2018 .09000 2093 .46500 2168 .84000 2243 .21500 2318 .59000
1869 .34500 1944 .72000 2019 .09500
2
094 .47000 2169 .84500 2244 .22000 2319 .59500
1870 .35000 1945 .72500 2020 .10000 2095 .47500 2170 .85000 2245 .22500 2320 .60000
1871 .35500 1946 .73000 2021 .10500 2096 .48000 2171 .85500 2246 .23000 2321 .60500
1872 .36000 1947 .73500 2022 .11000 2097 .48500 2172 .86000 2247 .23500 2322 .61000
1873 .36500 1948 .74000 2023 .11500 2098 .49000 2173 .86500 2248 .24000 2323 .61500
1874 .37000 1949 .74500 2024 .12000 2099 .49500 2174 .87000 2249 .24500 2324 .62000
1875 .37500 1950 137.75000 2025 .12500 2100
1
38.50000 2175 .87500 2250 139.25000 2325 .62500
1876 .38000 1951 .75500 2026 .13000 2101 .50500 2176 .88000 2251 .25500 2326 .63000
1877 .38500 1952 .76000 2027 .13500 2102 .51000 2177 .88500 2252 .26000 2327 .63500
1878 .39000 1953 .76500 2028 .14000 2103 .51500 2178 .89000 2253 .26500 2328 .64000
1879 .39500 1954 .77000 2029 .14500 2104 .52000 2179 .89500 2254 .27000 2329 .64500
1880 .40000 1955 .77500 2030 .15000 2105 .52500 2180 .90000 2255 .27500 2330 .65000
1881 .40500 1956 .78000 2031 .15500 2106 .53000 2181 .90500 2256 .28000 2331 .65500
1882 .41000 1957 .78500 2032 .16000 2107 .53500 2182 .91000 2257 .28500 2332 .66000
1883 .41500 1958 .79000 2033 .16500 2108 .54000 2183 .91500 2258 .29000 2333 .66500
1884 .42000 1959 .79500 2034 .17000 2109 .54500 2184 .92000 2259 .29500 2334 .67000
1885 .42500 1960 .80000 2035 .17500 2110 .55000 2185 .92500 2260 .30000 2335 .67500
1886 .43000 1961 .80500 2036 .18000 2111 .55500 2186 .93000 2261 .30500 2336 .68000
1887 .43500 1962 .81000 2037 .18500 2112 .56000 2187 .93500 2262 .31000 2337 .68500
1888 .44000 1963 .81500 2038 .19000 2113 .56500 2188 .94000 2263 .31500 2338 .69000
1889 .44500 1964 .82000 2039 .19500 2114 .57000 2189 .94500 2264 .32000 2339 .69500
1890 .45000 1965 .82500 2040 .20000 2115 .57500 2190 .95000 2265 .32500 2340 .70000
1891 .45500 1966 .83000 2041 .20500 2116 .58000 2191 .95500 2266 .33000 2341 .70500
1892 .46000 1967 .83500 2042 .21000 2117 .58500 2192 .96000 2267 .33500 2342 .71000
1893 .46500 1968 .84000 2043 .21500 2118 .59000 2193 .96500 2268 .34000 2343 .71500
1894 .47000 1969 .84500 2044 .22000 2119 .59500 2194 .97000 2269 .34500 2344 .72000
1895 .47500 1970 .85000 2045 .22500 2120 .60000 2195 .97500 2270 .35000 2345 .72500
1896 .48000 1971 .85500 2046 .23000 2121 .60500 2196 .98000 2271 .35500 2346 .73000
1897 .48500 1972 .86000 2047 .23500 2122 .61000 2197 .98500 2272 .36000 2347 .73500
1898 .49000 1973 .86500 2048 .24000 2123 .61500 2198 .99000 2273 .36500 2348 .74000
1899 .49500 1974 .87000 2049 .24500 2124 .62000 2199 .99500 2274 .37000 2349 .74500
1900 137.50000 1975 .87500 2050 138.25000 2125 .62500 2200 139.00000 2275 .37500 2350 139.75000
1901 .50500 1976 .88000 2051 .25500 2126 .63000 2201 .00500 2276 .38000 2351 .75500
1902 .51000 1977 .88500 2052 .26000 2127 .63500 2202 .01000 2277 .38500 2352 .76000
1903 .51500 1978 .89000 2053 .26500 2128 .64000 2203 .01500 2278 .39000 2353 .76500
1904 .52000 1979 .89500 2054 .27000 2129 .64500 2204 .02000 2279 .39500 2354 .77000
1905 .52500 1980 .90000 2055 .27500 2130 .65000 2205 .02500 2280 .40000 2355 .77500
1906 .53000 1981 .90500 2056 .28000 2131 .65500 2206 .03000 2281 .40500 2356 .78000
1907 .53500 1982 .91000 2057 .28500 2132 .66000 2207 .03500 2282 .41000 2357 .78500
1908 .54000 1983 .91500 2058 .29000 2133 .66500 2208 .04000 2283 .41500 2358 .79000
1909 .54500 1984 .92000 2059 .29500 2134 .67000 2209 .04500 2284 .42000 2359 .79500
1910 .55000 1985 .92500 2060 .30000 2135 .67500 2210 .05000 2285 .42500 2360 .80000
1911 .55500 1986 .93000 2061 .30500 2136 .68000 2211 .05500 2286 .43000 2361 .80500
1912 .56000 1987 .93500 2062 .31000 2137 .68500 2212 .06000 2287 .43500 2362 .81000
1913 .56500 1988 .94000 2063 .31500 2138 .69000 2213 .06500 2288 .44000 2363 .81500
1914 .57000 1989 .94500 2064 .32000 2139 .69500 2214 .07000 2289 .44500 2364 .82000
1915 .57500 1990 .95000 2065 .32500 2140 .70000 2215 .07500 2290 .45000 2365 .82500
1916 .58000 1991 .95500 2066 .33000 2141 .70500 2216 .08000 2291 .45500 2366 .83000
1917 .58500 1992 .96000 2067 .33500 2142 .71000 2217 .08500 2292 .46000 2367 .83500
1918 .59000 1993 .96500 2068 .34000 2143 .71500 2218 .09000 2293 .46500 2368 .84000
1919 .59500 1994 .97000 2069 .34500 2144 .72000 2219 .09500 2294 .47000 2369 .84500
1920 .60000 1995 .97500 2070 .35000 2145 .72500 2220 .10000 2295 .47500 2370 .85000
1921 .60500 1996 .98000 2071 .35500 2146 .73000 2221 .10500 2296 .48000 2371 .85500
1922 .61000 1997 .98500 2072 .36000 2147 .73500 2222 .11000 2297 .48500 2372 .86000
1923 .61500 1998 .99000 2073 .36500 2148 .74000 2223 .11500 2298 .49000 2373 .86500
1924 .62000 1999 .99500 2074 .37000 2149 .74500 2224 .12000 2299 .49500 2374 .87000