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
3-5
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)
2100 160.50000 2175 160.87500 2250 161.25000 2325 161.62500 2400 162.00000 2475 162.37500 2550 162.75000
2101 .50500 2176 .88000 2251 .25500 2326 .63000 2401 .00500 2476 .38000 2551 .75500
2102 .51000 2177 .88500 2252 .26000 2327 .63500 2402 .01000 2477 .38500 2552 .76000
2103 .51500 2178 .89000 2253 .26500 2328 .64000 2403 .01500 2478 .39000 2553 .76500
2104 .52000 2179 .89500 2254 .27000 2329 .64500 2404 .02000 2479 .39500 2554 .77000
2105 .52500 2180 .90000 2255 .27500 2330 .65000 2405 .02500 2480 .40000 2555 .77500
2106 .53000 2181 .90500 2256 .28000 2331 .65500 2406 .03000 2481 .40500 2556 .78000
2107 .53500 2182 .91000 2257 .28500 2332 .66000 2407 .03500 2482 .41000 2557 .78500
2108 .54000 2183 .91500 2258 .29000 2333 .66500 2408 .04000 2483 .41500 2558 .79000
2109 .54500 2184 .92000 2259 .29500 2334 .67000 2409 .04500 2484 .42000 2559 .79500
2110 .55000 2185 .92500 2260 .30000 2335 .67500 2410 .05000 2485 .42500 2560 .80000
2111 .55500 2186 .93000 2261 .30500 2336 .68000 2411 .05500 2486 .43000 2561 .80500
2112 .56000 2187 .93500 2262 .31000 2337 .68500 2412 .06000 2487 .43500 2562 .81000
2113 .56500 2188 .94000 2263 .31500 2338 .69000 2413 .06500 2488 .44000 2563 .81500
2114 .57000 2189 .94500 2264 .32000 2339 .69500 2414 .07000 2489 .44500 2564 .82000
2115 .57500 2190 .95000 2265 .32500 2340 .70000 2415 .07500 2490 .45000 2565 .82500
2116 .58000 2191 .95500 2266 .33000 2341 .70500 2416 .08000 2491 .45500 2566 .83000
2117 .58500 2192 .96000 2267 .33500 2342 .71000 2417 .08500 2492 .46000 2567 .83500
2118 .59000 2193 .96500 2268 .34000 2343 .71500 2418 .09000 2493 .46500 2568 .84000
2119 .59500 2194 .97000 2269 .34500 2344 .72000 2419 .09500 2494 .47000 2569 .84500
2120 .60000 2195 .97500 2270 .35000 2345 .72500 2420 .10000 2495 .47500 2570 .85000
2121 .60500 2196 .98000 2271 .35500 2346 .73000 2421 .10500 2496 .48000 2571 .85500
2122 .61000 2197 .98500 2272 .36000 2347 .73500 2422 .11000 2497 .48500 2572 .86000
2123 .61500 2198 .99000 2273 .36500 2348 .74000 2423 .11500 2498 .49000 2573 .86500
2124 .62000 2199 .99500 2274 .37000 2349 .74500 2424 .12000 2499 .49500 2574 .87000
2125 .62500 2200 161.00000 2275 .37500 2350 161.75000 2425 .12500 2500 162.50000 2575 .87500
2126 .63000 2201 .00500 2276 .38000 2351 .75500 2426 .13000 2501 .50500 2576 .88000
2127 .63500 2202 .01000 2277 .38500 2352 .76000 2427 .13500 2502 .51000 2577 .88500
2128 .64000 2203 .01500 2278 .39000 2353 .76500 2428 .14000 2503 .51500 2578 .89000
2129 .64500 2204 .02000 2279 .39500 2354 .77000 2429 .14500 2504 .52000 2579 .89500
2130 .65000 2205 .02500 2280 .40000 2355 .77500 2430 .15000 2505 .52500 2580 .90000
2131 .65500 2206 .03000 2281 .40500 2356 .78000 2431 .15500 2506 .53000 258
1
.90500
2132 .66000 2207 .03500 2282 .41000 2357 .78500 2432 .16000 2507 .53500 2582 .91000
2133 .66500 2208 .04000 2283 .41500 2358 .79000 2433 .16500 2508 .54000 2583 .91500
2134 .67000 2209 .04500 2284 .42000 2359 .79500 2434 .17000 2509 .54500 2584
.9
2000
2135 .67500 2210 .05000 2285 .42500 2360 .80000 2435 .17500 2510 .55000 2585 .92500
2136 .68000 2211 .05500 2286 .43000 2361 .80500 2436 .18000 2511 .55500 2586 .93000
2137 .68500 2212 .06000 2287 .43500 2362 .81000 2437 .18500 2512 .56000 2587 .93500
2138 .69000 2213 .06500 2288 .44000 2363 .81500 2438 .19000 2513 .56500 2588 .94000
2139 .69500 2214 .07000 2289 .44500 2364 .82000 2439 .19500 2514 .57000 2589 .94500
2140 .70000 2215 .07500 2290 .45000 2365 .82500 2440 .20000 2515 .57500 2590 .95000
2141 .70500 2216 .08000 2291 .45500 2366 .83000 2441 .20500 2516 .58000 2591 .95500
2142 .71000 2217 .08500 2292 .46000 2367 .83500 2442 .21000 2517 .58500 2592 .96000
2143 .71500 2218 .09000 2293 .46500 2368 .84000 2443 .21500 2518 .59000 2593 .96500
2144
.7
2000 2219 .09500 2294 .47000 2369 .84500 2444 .22000 2519 .59500 2594 .97000
2145 .72500 2220 .10000 2295 .47500 2370 .85000 2445 .22500 2520 .60000 2595 .97500
2146 .73000 2221 .10500 2296 .48000 2371 .85500 2446 .23000 2521 .60500 2596 .98000
2147 .73500 2222 .11000 2297 .48500 2372 .86000 2447 .23500 2522 .61000 2597 .98500
2148 .74000 2223 .11500 2298 .49000 2373 .86500 2448 .24000 2523 .61500 2598 .99000
2149 .74500 2224 .12000 2299 .49500 2374 .87000 2449 .24500 2524 .62000 2599 .99500
2150 160.75000 2225 .12500 2300 161.50000 2375 .87500 2450 162.25000 2525 .62500 2600 163.00000
2151 .75500 2226 .13000 2301 .50500 2376 .88000 2451 .25500 2526 .63000 2601 .00500
2152 .76000 2227 .13500 2302 .51000 2377 .88500 2452 .26000 2527 .63500 2602 .01000
2153
.7
6500 2228 .14000 2303 .51500 2378 .89000 2453 .26500 2528 .64000 2603 .01500
2154 .77000 2229 .14500 2304 .52000 2379 .89500 2454 .27000 2529 .64500 2604 .02000
2155 .77500 2230 .15000 2305 .52500 2380 .90000 2455 .27500 2530 .65000 2605 .02500
2156 .78000 2231 .15500 2306 .53000 2381 .90500 2456 .28000 2531 .65500 2606 .03000
2157 .78500 2232 .16000 2307 .53500 2382 .91000 2457 .28500 2532 .66000 2607 .03500
2158 .79000 2233 .16500 2308 .54000 2383 .91500 2458 .29000 2533 .66500 2608 .04000
2159 .79500 223
4
.17000 2309 .54500 2384 .92000 2459 .29500 2534 .67000 2609 .04500
2160 .80000 2235 .17500 2310 .55000 2385 .92500 2460 .30000 2535 .67500 2610 .05000
2161 .80500 2236 .18000 2311 .55500 2386 .93000 2461 .30500 2536 .68000 2611 .05500
2162 .81000 2237
.1
8500 2312 .56000 2387 .93500 2462 .31000 2537 .68500 2612 .06000
2163 .81500 2238 .19000 2313 .56500 2388 .94000 2463 .31500 2538 .69000 2613 .06500
2164 .82000 2239 .19500 2314 .57000 2389 .94500 2464 .32000 2539 .69500 2614 .07000
2165 .82500 2240 .20000 2315 .57500 2390 .95000 2465 .32500 2540 .70000 2615 .07500
2166 .83000 2241 .20500 2316 .58000 2391 .95500 2466 .33000 2541 .70500 2616 .08000
2167 .83500 2242 .21000 2317 .58500 2392 .96000 2467 .33500 2542 .71000 2617 .08500
2168 .84000 2243 .21500 231
8
.59000 2393 .96500 2468 .34000 2543 .71500 2618 .09000
2169 .84500 2244 .22000 2319 .59500 2394 .97000 2469 .34500 2544 .72000 2619 .09500
2170 .85000 2245 .22500 2320 .60000 2395 .97500 2470 .35000 2545 .72500 2620 .10000
2171 .85500 2246 .23000 2321
.6
0500 2396 .98000 2471 .35500 2546 .73000 2621 .10500
2172 .86000 2247 .23500 2322 .61000 2397 .98500 2472 .36000 2547 .73500 2622 .11000
2173 .86500 2248 .24000 2323 .61500 2398 .99000 2473 .36500 2548 .74000 2623 .11500
2174 .87000 2249 .24500 2324 .62000 2399 .99500 2474 .37000 2549 .74500 2624 .12000