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
1-5
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)
2900 142.50000 2975 142.87500 3050 143.25000 3125 143.62500 3200 144.00000 3275 144.37500 3350 144.75000
2901 .50500 2976 .88000 3051 .25500 3126 .63000 3201 .00500 3276 .38000 3351 .75500
2902 .51000 2977 .88500 3052 .26000 3127 .63500 3202 .01000
3
277 .38500 3352 .76000
2903 .51500 2978 .89000 3053 .26500 3128 .64000 3203 .01500 3278 .39000 3353 .76500
2904 .52000 2979 .89500 3054 .27000 3129 .64500 3204 .02000 3279 .39500 3354 .77000
2905 .52500 2980 .90000 3055 .27500 3130 .65000 3205 .02500 3280 .40000 3355 .77500
2906 .53000 2981 .90500 3056 .28000 3131 .65500 3206 .03000 3281 .40500 3356 .78000
2907 .53500 2982 .91000 3057 .28500 3132 .66000 3207 .03500 3282 .41000 3357 .78500
2908 .54000 2983 .91500 3058 .29000 3133 .66500 3208 .04000 3283 .415
00
3358 .79000
2909 .54500 2984 .92000 3059 .29500 3134 .67000 3209 .04500 3284 .42000 3359 .79500
2910 .55000 2985 .92500 3060 .30000 3135 .67500 3210 .05000 3285 .42500 3360 .80000
2911 .55500 2986 .93000 3061 .30500 3136 .68000 3211 .05500 3286 .43000
3
361 .80500
2912 .56000 2987 .93500 3062 .31000 3137 .68500 3212 .06000 3287 .43500 3362 .81000
2913 .56500 2988 .94000 3063 .31500 3138 .69000 3213 .06500 3288 .44000 3363 .81500
2914 .57000 2989 .94500 3064 .32000 3139 .69500 3214 .07000 3289 .44500 3364 .82000
2915 .57500 2990 .95000 3065 .32500 3140 .70000 3215 .07500 3290 .45000 3365 .82500
2916 .58000 2991 .95500 3066 .33000 3141 .70500 3216 .08000 3291 .45500 3366 .83000
2917 .58500 2992 .96000 3067 .33500 3142 .71000 3217 .08500 3292 .46000 3367 .835
00
2918 .59000 2993 .96500 3068 .34000 3143 .71500 3218 .09000 3293 .46500 3368 .84000
2919 .59500 2994 .97000 3069 .34500 3144 .72000 3219 .09500 3294 .47000 3369 .84500
2920 .60000 2995 .97500 3070 .35000 3145 .72500 3220 .10000 3295 .47500 3370 .85000
2921 .60500 2996 .98000 3071 .35500 3146 .73000 3221 .10500 3296 .48000 3371 .85500
2922 .61000 2997 .98500 3072 .36000 3147 .73500 3222 .11000 3297 .48500 3372 .86000
2923 .61500 2998 .99000 3073 .36500 3148 .74000 3223 .11500 3298 .49000 3373 .86500
2924 .62000 2999 .99500 3074 .37000 3149 .74500 3224 .12000 3299 .49500 3374 .87000
2925 .62500 3000 143.00000 3075 .37500 3150 143.75000 3225 .12500 3300 144.50000 3375 .87500
2926 .63000 3001 .00500 3076 .38000 3151 .75500 3226 .13000 3301 .50500 3376 .88000
2927 .63500 3002 .01000 3077 .38500 3152 .76000 3227 .13500 3302 .51000 3377 .88500
2928 .64000 3003 .01500 3078 .39000 3153 .76500 3228 .14000 3303 .51500 3378 .89000
2929 .64500 3004 .02000 3079 .39500 3154 .77000 3229 .14500 3304 .52000 3379 .89500
2930 .65000 3005 .02500 3080 .40000 3155 .77500 3230 .15000 3305 .52500 3380 .90000
2931 .65500 3006 .03000 3081 .40500 3156 .78000 3231 .15500 3306 .53000 3381 .90500
2932 .66000 3007 .03500 3082 .41000 3157 .78500 3232 .16000 3307 .53500 3382 .91000
2933 .66500 3008 .04000 3083 .41500 3158 .79000 3233 .16500 3308 .54000 3383 .91500
2934 .67000 3009 .04500 3084 .42000 3159 .79500 3234 .17000 3309 .54500 3384 .92000
2935 .67500 3010 .05000 3085 .42500 3160 .80000 3235 .17500 3310 .55000 3385 .92500
2936 .68000 3011 .05500 3086 .43000 3161 .80500 3236 .18000 3311 .55500 3386 .93000
2937 .68500 3012 .06000 3087 .43500 3162 .81000 3237 .18500 3312 .56000 3387 .93500
2938 .69000 3013 .06500 3088 .44000 3163 .81500 3238 .19000 3313 .56500 3388 .94000
2939 .69500 3014 .07000 3089 .44500 3164 .82000 3239 .19500 3314 .57000 3389 .94500
2940 .70000 3015 .07500 3090 .45000 3165 .82500 3240 .20000 3315 .57500 3390 .95000
2941 .70500 3016 .08000 3091 .45500 3166 .83000 3241 .20500 3316 .58000 3391 .95500
2942 .71000 3017 .08500 3092 .46000 3167 .83500 3242 .21000 3317 .58500 3392 .96000
2943 .71500 3018 .09000 3093 .46500 3168 .84000 3243 .21500 3318 .59000 3393 .96500
2944 .72000 3019 .09500 3094 .47000 3169 .84500 3244 .22000 3319 .59500 3394 .97000
2945 .72500 3020 .10000 3095 .47500 3170 .85000 3245 .22500 3320 .60000 3395 .97500
2946 .73000 3021 .10500 3096 .48000 3171 .85500 3246 .23000 3321 .60500 3396 .98000
2947 .73500 3022 .11000 3097 .48500 3172 .86000 3247 .23500 3322 .61000 3397 .98500
2948 .74000 3023 .11500 3098 .49000 3173 .86500 3248 .24000 3323 .61500 3398 .99000
2949 .74500 3024 .12000 3099 .49500 3174 .87000 3249 .24500 3324 .62000 3399 .99500
2950 142.75000 3025 .12500 3100 143.50000 3175 .87500 3250 144.25000 3325 .62500 3400 145.00000
2951 .75500 3026 .13000 3101 .50500 3176 .88000 3251 .25500 3326 .63000 3401 .00500
2952 .76000 3027 .13500 3102 .51000 3177 .88500 3252 .26000 3327 .63500 3402 .01000
2953 .76500 3028 .14000 3103 .51500 3178 .89000 3253 .26500 3328 .64000 3403 .01500
2954 .77000 3029 .14500 3104 .52000 3179 .89500 3254 .27000 3329 .64500 3404 .02000
2955 .77500 3030 .15000 3105 .52500 3180 .90000 3255 .27500 3330 .65000 3405 .02500
2956 .78000 3031 .15500 3106 .53000 3181 .90500 3256 .28000 3331 .65500 3406 .03000
2957 .78500 3032 .16000 3107 .53500 3182 .91000 3257 .28500 3332 .66000 3407 .03500
2958 .79000 3033 .16500 3108 .54000 3183 .91500 3258 .29000 3333 .66500 3408 .04000
2959 .79500 3034 .17000 3109 .54500 3184 .92000 3259 .29500 3334 .67000 3409 .04500
2960 .80000 3035 .17500 3110 .55000 3185 .92500 3260 .30000 3335 .67500 3410 .05000
2961 .80500 3036 .18000 3111 .55500 3186 .93000 3261 .30500 3336 .68000 3411 .05500
2962 .81000 3037 .18500 3112 .56000 3187 .93500 3262 .31000 3337 .68500 3412 .06000
2963 .81500 3038 .19000 3113 .56500 3188 .94000 3263 .31500 3338 .69000 3413 .06500
2964 .82000 3039 .19500 3114 .57000 3189 .94500 3264 .32000 3339 .69500 3414 .07000
2965 .82500 3040 .20000 3115 .57500 3190 .95000 3265 .32500 3340 .70000 3415 .07500
2966 .83000 3041 .20500 3116 .58000 3191 .95500 3266 .33000 3341 .70500 3416 .08000
2967 .83500 3042 .21000 3117 .58500 3192 .96000 3267 .33500 3342 .71000 3417 .08500
2968 .84000 3043 .21500 3118 .59000 3193 .96500 3268 .34000 3343 .71500 3418 .09000
2969 .84500 3044 .22000 3119 .59500 3194 .97000 3269 .34500 3344 .72000 3419 .09500
2970 .85000 3045 .22500 3120 .60000 3195 .97500 3270 .35000 3345 .72500 3420 .10000
2971 .85500 3046 .23000 3121 .60500 3196 .98000 3271 .35500 3346 .73000 3421 .10500
2972 .86000 3047 .23500 3122 .61000 3197 .98500 3272 .36000 3347 .73500 3422 .11000
2973 .86500 3048 .24000 3123 .61500 3198 .99000 3273 .36500 3348 .74000 3423 .11500
2974 .87000 3049 .24500 3124 .62000 3199 .99500 3274 .37000 3349 .74500 3424 .12000