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
1-7
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)
3950 147.75000 4025 148.12500 4100 148.50000 4175 148.87500 4250 149.25000 4325 149.62500 4400 150.00000
3951 .75500 4026 .1300
0
4101 .50500 4176 .88000 4251 .25500 4326 .63000
3952 .76000 4027 .13500 4102 .51000 4177 .88500 4252 .26000 4327 .63500
3953 .76500 4028 .14000 4103 .51500 4178 .89000 4253 .26500 4328 .64000
3954 .77000 4029 .14500 4104 .52000 4179 .89500 4254 .27000
43 29
.64500
3955 .77500 4030 .15000 4105 .52500 4180 .90000 4255 .27500 4330 .65000
3956 .78000 4031 .15500 4106 .53000 4181 .90500 4256 .28000 4331 .65500
3957 .78500 4032 .16000 4107 .53500 4182 .91000 4257 .28500 4332 .66000
3958 .79000 4033 .16500 4108
.
54000 4183 .91500 4258 .29000 4333 .66500
3959 .79500 4034 .17000 4109 .54500 4184 .92000 4259 .29500 4334 .67000
3960 .80000 4035 .17500 4110 .55000 4185 .92500 4260 .30000 4335 .67500
3961 .80500 4036 .18000 4111 .55500 4186 .93000 4261 .30500 4336 .6800
0
3962 .81000 4037 .18500 4112 .56000 4187 .93500 4262 .31000 4337 .68500
3963 .81500 4038 .19000 4113 .56500 4188 .94000 4263 .31500 4338 .69000
3964 .82000 4039 .19500 4114 .57000 4189 .94500 4264 .32000 4339 .69500
3965 .82500 4040 .20000 4115 .57500
41 90
.95000 4265 .32500 4340 .70000
3966 .83000 4041 .20500 4116 .58000 4191 .95500 4266 .33000 4341 .70500
3967 .83500 4042 .21000 4117 .58500 4192 .96000 4267 .33500 4342 .71000
3968 .84000 4043 .21500 4118 .59000 4193 .96500 4268 .34000 4343 .71500
3969
.
84500 4044 .22000 4119 .59500 4194 .97000 4269 .34500 4344 .72000
3970 .85000 4045 .22500 4120 .60000 4195 .97500 4270 .35000 4345 .72500
3971 .85500 4046 .23000 4121 .60500 4196 .98000 4271 .35500 4346 .73000
3972 .86000 4047 .23500 4122 .61000 4197 .9850
0
4272 .36000 4347 .73500
3973 .86500 4048 .24000 4123 .61500 4198 .99000 4273 .36500 4348 .74000
3974 .87000 4049 .24500 4124 .62000 4199 .99500 4274 .37000 4349 .74500
3975 .87500 4050 148.25000 4125 .62500 4200 149.00000 4275 .37500 4350 149.75000
3976 .88000 4051 .25500 4126 .63000 4201 .00500 4276 .38000 4351 .75500
3977 .88500 4052 .26000 4127 .63500 4202 .01000 4277 .38500 4352 .76000
3978 .89000 4053 .26500 4128 .64000 4203 .01500 4278 .39000 4353 .76500
3979 .89500 4054 .27000 4129 .64500 4204 .020
00
4279 .39500 4354 .77000
3980 .90000 4055 .27500 4130 .65000 4205 .02500 4280 .40000 4355 .77500
3981 .90500 4056 .28000 4131 .65500 4206 .03000 4281 .40500 4356 .78000
3982 .91000 4057 .28500 4132 .66000 4207 .03500 4282 .41000 4357 .78500
3983 .91500
4
058 .29000 4133 .66500 4208 .04000 4283 .41500 4358 .79000
3984 .92000 4059 .29500 4134 .67000 4209 .04500 4284 .42000 4359 .79500
3985 .92500 4060 .30000 4135 .67500 4210 .05000 4285 .42500 4360 .80000
3986 .93000 4061 .30500 4136 .68000 4211 .05500 4286 .43000 4361 .80500
3987 .93500 4062 .31000 4137 .68500 4212 .06000 4287 .43500 4362 .81000
3988 .94000 4063 .31500 4138 .69000 4213 .06500 4288 .44000 4363 .81500
3989 .94500 4064 .32000 4139 .69500 4214 .07000 4289 .44500 4364 .82000
3990 .95000 4065 .325
00
4140 .70000 4215 .07500 4290 .45000 4365 .82500
3991 .95500 4066 .33000 4141 .70500 4216 .08000 4291 .45500 4366 .83000
3992 .96000 4067 .33500 4142 .71000 4217 .08500 4292 .46000 4367 .83500
3993 .96500 4068 .34000 4143 .71500 4218 .09000 4293 .46500
4
368 .84000
3994 .97000 4069 .34500 4144 .72000 4219 .09500 4294 .47000 4369 .84500
3995 .97500 4070 .35000 4145 .72500 4220 .10000 4295 .47500 4370 .85000
3996 .98000 4071 .35500 4146 .73000 4221 .10500 4296 .48000 4371 .85500
3997 .98500 4072 .36000 4147 .73500 4222 .11000 4297 .48500 4372 .86000
3998 .99000 4073 .36500 4148 .74000 4223 .11500 4298 .49000 4373 .86500
3999 .99500 4074 .37000 4149 .74500 4224 .12000 4299 .49500 4374 .87000
4000 148.00000 4075 .37500 4150 148.75000 4225 .12500 4300 149.50000 4375 .87500
4001 .00500 4076 .38000 4151 .75500 4226 .13000 4301 .50500 4376 .88000
4002 .01000 4077 .38500 4152 .76000 4227 .13500 4302 .51000 4377 .88500
4003 .01500 4078 .39000 4153 .76500 4228 .14000 4303 .51500 4378 .89000
4004 .02000 4079 .39500 4154 .77000 4229 .14500 4304 .52000 4379 .89500
4005 .02500 4080 .40000 4155 .77500 4230 .15000 4305 .52500 4380 .90000
4006 .03000 4081 .40500 4156 .78000 4231 .15500 4306 .53000 4381 .90500
4007 .03500 4082 .41000 4157 .78500 4232 .16000 4307 .53500 4382 .91000
4008 .04000 4083 .41500 4158 .79000 4233 .16500 4308 .54000 4383 .91500
4009 .04500 4084 .42000 4159 .79500 4234 .17000 4309 .54500 4384 .92000
4010 .05000 4085 .42500 4160 .80000 4235 .17500 4310 .55000 4385 .92500
4011 .05500 4086 .43000 4161 .80500 4236 .18000 4311 .55500 4386 .93000
4012 .06000 4087 .43500 4162 .81000 4237 .18500 4312 .56000 4387 .93500
4013 .06500 4088 .44000 4163 .81500 4238 .19000 4313 .56500 4388 .94000
4014 .07000 4089 .44500 4164 .82000 4239 .19500 4314 .57000 4389 .94500
4015 .07500 4090 .45000 4165 .82500 4240 .20000 4315 .57500 4390 .95000
4016 .08000 4091 .45500 4166 .83000 4241 .20500 4316 .58000 4391 .95500
4017 .08500 4092 .46000 4167 .83500 4242 .21000 4317 .58500 4392 .96000
4018 .09000 4093 .46500 4168 .84000 4243 .21500 4318 .59000 4393 .96500
4019 .09500 4094 .47000 4169 .84500 4244 .22000 4319 .59500 4394 .97000
4020 .10000 4095 .47500 4170 .85000 4245 .22500 4320 .60000 4395 .97500
4021 .10500 4096 .48000 4171 .85500 4246 .23000 4321 .60500 4396 .98000
4022 .11000 4097 .48500 4172 .86000 4247 .23500 4322 .61000 4397 .98500
4023 .11500 4098 .49000 4173 .86500 4248 .24000 4323 .61500 4398 .99000
4024 .12000 4099 .49500 4174 .87000 4249 .24500 4324 .62000 4399 .99500