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
3-8
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
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)
3675 168.37500 3750 168.75000 3825 169.12500 3900 169.50000 3975 169.87500 4050 170.25000
4
125 170.62500
3676 .38000 3751 .75500 3826 .13000 3901 .50500 3976 .88000 4051 .25500 4126 .63000
3677 .38500 3752 .76000 3827 .13500 3902 .51000 3977 .88500 4052 .26000 4127 .63500
3678 .39000 3753 .76500 3828 .14000 3903 .51500 3978 .89000 4053 .26500
41 28
.64000
3679 .39500 3754 .77000 3829 .14500 3904 .52000 3979 .89500 4054 .27000 4129 .64500
3680 .40000 3755 .77500 3830 .15000 3905 .52500 3980 .90000 4055 .27500 4130 .65000
3681 .40500 3756 .78000 3831 .15500 3906 .53000 3981 .90500 4056 .28000 4131
.
65500
3682 .41000 3757 .78500 3832 .16000 3907 .53500 3982 .91000 4057 .28500 4132 .66000
3683 .41500 3758 .79000 3833 .16500 3908 .54000 3983 .91500 4058 .29000 4133 .66500
3684 .42000 3759 .79500 3834 .17000 3909 .54500 3984 .92000 4059 .29500 4134 .6700
0
3685 .42500 3760 .80000 3835 .17500 3910 .55000 3985 .92500 4060 .30000 4135 .67500
3686 .43000 3761 .80500 3836 .18000 3911 .55500 3986 .93000 4061 .30500 4136 .68000
3687 .43500 3762 .81000 3837 .18500 3912 .56000 3987 .93500 4062 .31000 4137 .68500
3688 .44000 3763 .81500 3838 .19000 3913 .56500 3988 .94000 4063 .31500 4138 .69000
3689 .44500 3764 .82000 3839 .19500 3914 .57000 3989 .94500 4064 .32000 4139 .69500
3690 .45000 3765 .82500 3840 .20000 3915 .57500 3990 .95000 4065 .32500 4140 .70000
3691
.
45500 3766 .83000 3841 .20500 3916 .58000 3991 .95500 4066 .33000 4141 .70500
3692 .46000 3767 .83500 3842 .21000 3917 .58500 3992 .96000 4067 .33500 4142 .71000
3693 .46500 3768 .84000 3843 .21500 3918 .59000 3993 .96500 4068 .34000 4143 .71500
3694 .4700
0
3769 .84500 3844 .22000 3919 .59500 3994 .97000 4069 .34500 4144 .72000
3695 .47500 3770 .85000 3845 .22500 3920 .60000 3995 .97500 4070 .35000 4145 .72500
3696 .48000 3771 .85500 3846 .23000 3921 .60500 3996 .98000 4071 .35500 4146 .73000
3697 .48500
37 72
.86000 3847 .23500 3922 .61000 3997 .98500 4072 .36000 4147 .73500
3698 .49000 3773 .86500 3848 .24000 3923 .61500 3998 .99000 4073 .36500 4148 .74000
3699 .49500 3774 .87000 3849 .24500 3924 .62000 3999 .99500 4074 .37000 4149 .74500
3700 168.50000 377
5
.87500 3850 169.25000 3925 .62500 4000 170.00000 4075 .37500 4150 170.75000
3701 .50500 3776 .88000 3851 .25500 3926 .63000 4001 .00500 4076 .38000 4151 .75500
3702 .51000 3777 .88500 3852 .26000 3927 .63500 4002 .01000 4077 .38500 4152 .76000
3703 .5150
0
3778 .89000 3853 .26500 3928 .64000 4003 .01500 4078 .39000 4153 .76500
3704 .52000 3779 .89500 3854 .27000 3929 .64500 4004 .02000 4079 .39500 4154 .77000
3705 .52500 3780 .90000 3855 .27500 3930 .65000 4005 .02500 4080 .40000 4155 .77500
3706 .53000
37 81
.90500 3856 .28000 3931 .65500 4006 .03000 4081 .40500 4156 .78000
3707 .53500 3782 .91000 3857 .28500 3932 .66000 4007 .03500 4082 .41000 4157 .78500
3708 .54000 3783 .91500 3858 .29000 3933 .66500 4008 .04000 4083 .41500 4158 .79000
3709 .54500 3784
.
92000 3859 .29500 3934 .67000 4009 .04500 4084 .42000 4159 .79500
3710 .55000 3785 .92500 3860 .30000 3935 .67500 4010 .05000 4085 .42500 4160 .80000
3711 .55500 3786 .93000 3861 .30500 3936 .68000 4011 .05500 4086 .43000 4161 .80500
3712 .56000 3787 .9350
0
3862 .31000 3937 .68500 4012 .06000 4087 .43500 4162 .81000
3713 .56500 3788 .94000 3863 .31500 3938 .69000 4013 .06500 4088 .44000 4163 .81500
3714 .57000 3789 .94500 3864 .32000 3939 .69500 4014 .07000 4089 .44500 4164 .82000
3715 .57500 3790 .95000
38 65
.32500 3940 .70000 4015 .07500 4090 .45000 4165 .82500
3716 .58000 3791 .95500 3866 .33000 3941 .70500 4016 .08000 4091 .45500 4166 .83000
3717 .58500 3792 .96000 3867 .33500 3942 .71000 4017 .08500 4092 .46000 4167 .83500
3718 .59000 3793 .96500 3868
.
34000 3943 .71500 4018 .09000 4093 .46500 4168 .84000
3719 .59500 3794 .97000 3869 .34500 3944 .72000 4019 .09500 4094 .47000 4169 .84500
3720 .60000 3795 .97500 3870 .35000 3945 .72500 4020 .10000 4095 .47500 4170 .85000
3721 .60500 3796 .98000 3871 .3550
0
3946 .73000 4021 .10500 4096 .48000 4171 .85500
3722 .61000 3797 .98500 3872 .36000 3947 .73500 4022 .11000 4097 .48500 4172 .86000
3723 .61500 3798 .99000 3873 .36500 3948 .74000 4023 .11500 4098 .49000 4173 .86500
3724 .62000 3799 .99500 3874 .37000
39 49
.74500 4024 .12000 4099 .49500 4174 .87000
3725 .62500 3800 169.00000 3875 .37500 3950 169.75000 4025 .12500 4100 170.50000 4175 .87500
3726 .63000 3801 .00500 3876 .38000 3951 .75500 4026 .13000 4101 .50500 4176 .88000
3727 .63500 3802 .01000 3877 .385
00
3952 .76000 4027 .13500 4102 .51000 4177 .88500
3728 .64000 3803 .01500 3878 .39000 3953 .76500 4028 .14000 4103 .51500 4178 .89000
3729 .64500 3804 .02000 3879 .39500 3954 .77000 4029 .14500 4104 .52000 4179 .89500
3730 .65000 3805 .02500 3880 .40000
3
955 .77500 4030 .15000 4105 .52500 4180 .90000
3731 .65500 3806 .03000 3881 .40500 3956 .78000 4031 .15500 4106 .53000 4181 .90500
3732 .66000 3807 .03500 3882 .41000 3957 .78500 4032 .16000 4107 .53500 4182 .91000
3733 .66500 3808 .04000 3883 .41500 3958 .79000 4033 .16500 4108 .54000 4183 .91500
3734 .67000 3809 .04500 3884 .42000 3959 .79500 4034 .17000 4109 .54500 4184 .92000
3735 .67500 3810 .05000 3885 .42500 3960 .80000 4035 .17500 4110 .55000 4185 .92500
3736 .68000 3811 .05500 3886 .43000 3961 .805
00
4036 .18000 4111 .55500 4186 .93000
3737 .68500 3812 .06000 3887 .43500 3962 .81000 4037 .18500 4112 .56000 4187 .93500
3738 .69000 3813 .06500 3888 .44000 3963 .81500 4038 .19000 4113 .56500 4188 .94000
3739 .69500 3814 .07000 3889 .44500 3964 .82000
4
039 .19500 4114 .57000 4189 .94500
3740 .70000 3815 .07500 3890 .45000 3965 .82500 4040 .20000 4115 .57500 4190 .95000
3741 .70500 3816 .08000 3891 .45500 3966 .83000 4041 .20500 4116 .58000 4191 .95500
3742 .71000 3817 .08500 3892 .46000 3967 .83500 4042 .21000 4117 .58500 4192 .96000
3743 .71500 3818 .09000 3893 .46500 3968 .84000 4043 .21500 4118 .59000 4193 .96500
3744 .72000 3819 .09500 3894 .47000 3969 .84500 4044 .22000 4119 .59500 4194 .97000
3745 .72500 3820 .10000 3895 .47500 3970 .85000 4045 .225
00
4120 .60000 4195 .97500
3746 .73000 3821 .10500 3896 .48000 3971 .85500 4046 .23000 4121 .60500 4196 .98000
3747 .73500 3822 .11000 3897 .48500 3972 .86000 4047 .23500 4122 .61000 4197 .98500
3748 .74000 3823 .11500 3898 .49000 3973 .86500 4048 .24000
4
123 .61500 4198 .99000
3749 .74500 3824 .12000 3899 .49500 3974 .87000 4049 .24500 4124 .62000 4199 .99500