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
2-1
2 VT-3/140
Cha
nnel Designation
Table:
132-150MHz, 6.25kHz Increments
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)
5640 132.00000 5715 132.46875 5790
13
2.93750 5865 133.40625 5940 133.87500 6015 134.34375 6090 134.81250
5641 .00625 5716 .47500 5791 .94375 5866 .41250 5941 .88125 6016 .35000 6091 .81875
5642 .01250 5717 .48125 5792 .95000 5867 .41875 5942 .88750 6017 .35625 6092 .82500
5643 .01875 5718 .48750 5793 .95625 5868 .42500 5943 .89375 6018 .36250 6093 .83125
5644 .02500 5719 .49375 5794 .96250 5869 .43125 5944 .90000 6019 .36875 6094 .83750
5645 .03125 5720 132.50000 5795 .96875 5870 .43750 5945 .90625 6020 .37500 6095 .84375
5646 .03750 5721 .506
25
5796 .97500 5871 .44375 5946 .91250 6021 .38125 6096 .85000
5647 .04375 5722 .51250 5797 .98125 5872 .45000 5947 .91875 6022 .38750 6097 .85625
5648 .05000 5723 .51875 5798 .98750 5873 .45625 5948 .92500 6023 .39375 6098 .86250
5649 .05625 5724 .52500
5
799 .99375 5874 .46250 5949 .93125 6024 .40000 6099 .86875
5650 .06250 5725 .53125 5800 133.00000 5875 .46875 5950 .93750 6025 .40625 6100 .87500
5651 .06875 5726 .53750 5801 .00625 5876 .47500 5951 .94375 6026 .41250 6101 .88125
5652 .07500 5727 .54375
58 02
.01250 5877 .48125 5952 .95000 6027 .41875 6102 .88750
5653 .08125 5728 .55000 5803 .01875 5878 .48750 5953 .95625 6028 .42500 6103 .89375
5654 .08750 5729 .55625 5804 .02500 5879 .49375 5954 .96250 6029 .43125 6104 .90000
5655 .09375 5730 .56250 5805
.
03125 5880 133.50000 5955 .96875 6030 .43750 6105 .90625
5656 .10000 5731 .56875 5806 .03750 5881 .50625 5956 .97500 6031 .44375 6106 .91250
5657 .10625 5732 .57500 5807 .04375 5882 .51250 5957 .98125 6032 .45000 6107 .91875
5658 .11250 5733 .58125 5808
.0
5000 5883 .51875 5958 .98750 6033 .45625 6108 .92500
5659 .11875 5734 .58750 5809 .05625 5884 .52500 5959 .99375 6034 .46250 6109 .93125
5660 .12500 5735 .59375 5810 .06250 5885 .53125 5960 134.00000 6035 .46875 6110 .93750
5661 .13125 5736 .60000 5811 .06875 5886 .53750 5961 .00625 6036 .47500 6111 .94375
5662 .13750 5737 .60625 5812 .07500 5887 .54375 5962 .01250 6037 .48125 6112 .95000
5663 .14375 5738 .61250 5813 .08125 5888 .55000 5963 .01875 6038 .48750 6113 .95625
5664 .15000 5739 .61875 5814 .08750 5889 .55625 5964 .02500 6039 .49375 6114 .96250
5665 .15625 5740 .62500 5815 .09375 5890 .56250 5965 .03125 6040 134.50000 6115 .96875
5666 .16250 5741 .63125 5816 .10000 5891 .56875 5966 .03750 6041 .50625 6116 .97500
5667 .16875 5742 .63750 5817 .10625
5
892 .57500 5967 .04375 6042 .51250 6117 .98125
5668 .17500 5743 .64375 5818 .11250 5893 .58125 5968 .05000 6043 .51875 6118 .98750
5669 .18125 5744 .65000 5819 .11875 5894 .58750 5969 .05625 6044 .52500 6119 .99375
5670 .18750 5745 .65625 5820 .12500 5895 .59375 5970 .06250 6045 .53125 6120 135.00000
5671 .19375 5746 .66250 5821 .13125 5896 .60000 5971 .06875 6046 .53750 6121 .00625
5672 .20000 5747 .66875 5822 .13750 5897 .60625 5972 .07500 6047 .54375 6122 .01250
5673 .20625 5748 .67500 5823 .14375 5898
.
61250 5973 .08125 6048 .55000 6123 .01875
5674 .21250 5749 .68125 5824 .15000 5899 .61875 5974 .08750 6049 .55625 6124 .02500
5675 .21875 5750 .68750 5825 .15625 5900 .62500 5975 .09375 6050 .56250 6125 .03125
5676 .22500 5751 .69375 5826 .16250 5901 .6312
5
5976 .10000 6051 .56875 6126 .03750
5677 .23125 5752 .70000 5827 .16875 5902 .63750 5977 .10625 6052 .57500 6127 .04375
5678 .23750 5753 .70625 5828 .17500 5903 .64375 5978 .11250 6053 .58125 6128 .05000
5679 .24375 5754 .71250 5829 .18125 5904 .65000
59 79
.11875 6054 .58750 6129 .05625
5680 132.25000 5755 .71875 5830 .18750 5905 .65625 5980 .12500 6055 .59375 6130 .06250
5681 .25625 5756 .72500 5831 .19375 5906 .66250 5981 .13125 6056 .60000 6131 .06875
5682 .26250 5757 .73125 5832 .20000 5907 .66875 598
2
.13750 6057 .60625 6132 .07500
5683 .26875 5758 .73750 5833 .20625 5908 .67500 5983 .14375 6058 .61250 6133 .08125
5684 .27500 5759 .74375 5834 .21250 5909 .68125 5984 .15000 6059 .61875 6134 .08750
5685 .28125 5760 132.75000 5835 .21875 5910 .68750 5985 .15625 6060 .62500 6135 .09375
5686 .28750 5761 .75625 5836 .22500 5911 .69375 5986 .16250 6061 .63125 6136 .10000
5687 .29375 5762 .76250 5837 .23125 5912 .70000 5987 .16875 6062 .63750 6137 .10625
5688 .30000 5763 .76875 5838 .23750 5913 .70625 5988 .17500 6063 .64375 6138 .11250
5689 .30625 5764 .77500 5839 .24375 5914 .71250 5989 .18125 6064 .65000 6139 .11875
5690 .31250 5765 .78125 5840 133.25000 5915 .71875 5990 .18750 6065 .65625 6140 .12500
5691 .31875 5766 .78750 5841 .25625 5916 .72500 5991 .193
75
6066 .66250 6141 .13125
5692 .32500 5767 .79375 5842 .26250 5917 .73125 5992 .20000 6067 .66875 6142 .13750
5693 .33125 5768 .80000 5843 .26875 5918 .73750 5993 .20625 6068 .67500 6143 .14375
5694 .33750 5769 .80625 5844 .27500 5919 .74375 5994 .21250
6
069 .68125 6144 .15000
5695 .34375 5770 .81250 5845 .28125 5920 133.75000 5995 .21875 6070 .68750 6145 .15625
5696 .35000 5771 .81875 5846 .28750 5921 .75625 5996 .22500 6071 .69375 6146 .16250
5697 .35625 5772 .82500 5847 .29375 5922 .76250 5997 .23125
60 72
.70000 6147 .16875
5698 .36250 5773 .83125 5848 .30000 5923 .76875 5998 .23750 6073 .70625 6148 .17500
5699 .36875 5774 .83750 5849 .30625 5924 .77500 5999 .24375 6074 .71250 6149 .18125
5700 .37500 5775 .84375 5850 .31250 5925 .78125 6000 134.25000 607
5
.71875 6150 .18750
5701 .38125 5776 .85000 5851 .31875 5926 .78750 6001 .25625 6076 .72500 6151 .19375
5702 .38750 5777 .85625 5852 .32500 5927 .79375 6002 .26250 6077 .73125 6152 .20000
5703 .39375 5778 .86250 5853 .33125 5928 .80000 6003 .26875 6078
.7
3750 6153 .20625
5704 .40000 5779 .86875 5854 .33750 5929 .80625 6004 .27500 6079 .74375 6154 .21250
5705 .40625 5780 .87500 5855 .34375 5930 .81250 6005 .28125 6080 134.75000 6155 .21875
5706 .41250 5781 .88125 5856 .35000 5931 .81875 6006 .28750 6081 .75625 6156 .22500
5707 .41875 5782 .88750 5857 .35625 5932 .82500 6007 .29375 6082 .76250 6157 .23125
5708 .42500 5783 .89375 5858 .36250 5933 .83125 6008 .30000 6083 .76875 6158 .23750
5709 .43125 5784 .90000 5859 .36875 5934 .83750 6009 .30625 6084 .77500 6159 .24375
5710 .43750 5785 .90625 5860 .37500 5935 .84375 6010 .31250 6085 .78125 6160 135.25000
5711 .44375 5786 .91250 5861 .38125 5936 .85000 6011 .31875 6086 .78750 6161 .25625
5712 .45000 5787 .91875 5862 .38750 5937 .85625 6012 .32500 6087 .79375
6
162 .26250
5713 .45625 5788 .92500 5863 .39375 5938 .86250 6013 .33125 6088 .80000 6163 .26875
5714 .46250 5789 .93125 5864 .40000 5939 .86875 6014 .33750 6089 .80625 6164 .27500