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
4-2
VHF Transmitter Channel Designation Tables VT-3 132 - 174 MHz
VT-3/160
Channel
Designation
Table:
150
to
174
MHz,
6.
25
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)
5525 153.28125 5600 153.75000 5675 154.21875 5750 154.68750
5
825 155.15625 5900 155.62500 5975 156.09375
5526 .28750 5601 .75625 5676 .22500 5751 .69375 5826 .16250 5901 .63125 5976 .10000
5527 .29375 5602 .76250 5677 .23125 5752 .70000 5827 .16875 5902 .63750 5977 .10625
5528 .30000 5603 .76875 5678 .23750 5753 .70625 5828 .17500 5903 .64375 5978 .11250
5529 .30625 5604 .77500 5679 .24375 5754 .71250 5829 .18125 5904 .65000 5979 .11875
5530 .31250 5605 .78125 5680 154.25000 5755 .71875 5830 .18750 5905 .65625 5980 .12500
5531 .31875 5606 .78750 5681 .25625 5756 .725
00
5831 .19375 5906 .66250 5981 .13125
5532 .32500 5607 .79375 5682 .26250 5757 .73125 5832 .20000 5907 .66875 5982 .13750
5533 .33125 5608 .80000 5683 .26875 5758 .73750 5833 .20625 5908 .67500 5983 .14375
5534 .33750 5609 .80625 5684 .27500 5759 .74375
5
834 .21250 5909 .68125 5984 .15000
5535 .34375 5610 .81250 5685 .28125 5760 154.75000 5835 .21875 5910 .68750 5985 .15625
5536 .35000 5611 .81875 5686 .28750 5761 .75625 5836 .22500 5911 .69375 5986 .16250
5537 .35625 5612 .82500 5687 .29375 5762 .76250
58 37
.23125 5912 .70000 5987 .16875
5538 .36250 5613 .83125 5688 .30000 5763 .76875 5838 .23750 5913 .70625 5988 .17500
5539 .36875 5614 .83750 5689 .30625 5764 .77500 5839 .24375 5914 .71250 5989 .18125
5540 .37500 5615 .84375 5690 .31250 5765 .78125 5840
1
55.25000 5915 .71875 5990 .18750
5541 .38125 5616 .85000 5691 .31875 5766 .78750 5841 .25625 5916 .72500 5991 .19375
5542 .38750 5617 .85625 5692 .32500 5767 .79375 5842 .26250 5917 .73125 5992 .20000
5543 .39375 5618 .86250 5693 .33125 5768 .80000 5843
.2
6875 5918 .73750 5993 .20625
5544 .40000 5619 .86875 5694 .33750 5769 .80625 5844 .27500 5919 .74375 5994 .21250
5545 .40625 5620 .87500 5695 .34375 5770 .81250 5845 .28125 5920 155.75000 5995 .21875
5546 .41250 5621 .88125 5696 .35000 5771 .81875 5846 .28750 5921 .75625 5996 .22500
5547 .41875 5622 .88750 5697 .35625 5772 .82500 5847 .29375 5922 .76250 5997 .23125
5548 .42500 5623 .89375 5698 .36250 5773 .83125 5848 .30000 5923 .76875 5998 .23750
5549 .43125 5624 .90000 5699 .36875 5774 .83750 5849 .30625 5924 .77500 5999 .24375
5550 .43750 5625 .90625 5700 .37500 5775 .84375 5850 .31250 5925 .78125 6000 156.25000
5551 .44375 5626 .91250 5701 .38125 5776 .85000 5851 .31875 5926 .78750 6001 .25625
5552 .45000 5627 .91875 5702 .38750 5777 .85625 5852 .32500
5
927 .79375 6002 .26250
5553 .45625 5628 .92500 5703 .39375 5778 .86250 5853 .33125 5928 .80000 6003 .26875
5554 .46250 5629 .93125 5704 .40000 5779 .86875 5854 .33750 5929 .80625 6004 .27500
5555 .46875 5630 .93750 5705 .40625 5780 .87500 5855 .34375 5930 .81250 6005 .28125
5556 .47500 5631 .94375 5706 .41250 5781 .88125 5856 .35000 5931 .81875 6006 .28750
5557 .48125 5632 .95000 5707 .41875 5782 .88750 5857 .35625 5932 .82500 6007 .29375
5558 .48750 5633 .95625 5708 .42500 5783 .89375 5858 .36250 5933 .831
25
6008 .30000
5559 .49375 5634 .96250 5709 .43125 5784 .90000 5859 .36875 5934 .83750 6009 .30625
5560 153.50000 5635 .96875 5710 .43750 5785 .90625 5860 .37500 5935 .84375 6010 .31250
5561 .50625 5636 .97500 5711 .44375 5786 .91250 5861 .38125 5936 .8500
0
6011 .31875
5562 .51250 5637 .98125 5712 .45000 5787 .91875 5862 .38750 5937 .85625 6012 .32500
5563 .51875 5638 .98750 5713 .45625 5788 .92500 5863 .39375 5938 .86250 6013 .33125
5564 .52500 5639 .99375 5714 .46250 5789 .93125 5864 .40000 5939 .86875
60 14
.33750
5565 .53125 5640 154.00000 5715 .46875 5790 .93750 5865 .40625 5940 .87500 6015 .34375
5566 .53750 5641 .00625 5716 .47500 5791 .94375 5866 .41250 5941 .88125 6016 .35000
5567 .54375 5642 .01250 5717 .48125 5792 .95000 5867 .41875 5942 .88750 601
7
.35625
5568 .55000 5643 .01875 5718 .48750 5793 .95625 5868 .42500 5943 .89375 6018 .36250
5569 .55625 5644 .02500 5719 .49375 5794 .96250 5869 .43125 5944 .90000 6019 .36875
5570 .56250 5645 .03125 5720 154.50000 5795 .96875 5870 .43750 5945 .90625 6020 .37500
5571 .56875 5646 .03750 5721 .50625 5796 .97500 5871 .44375 5946 .91250 6021 .38125
5572 .57500 5647 .04375 5722 .51250 5797 .98125 5872 .45000 5947 .91875 6022 .38750
5573 .58125 5648 .05000 5723 .51875 5798 .98750 5873 .45625 5948 .92500 6023 .39375
5574 .58750 5649 .05625 5724 .52500 5799 .99375 5874 .46250 5949 .93125 6024 .40000
5575 .59375 5650 .06250 5725 .53125 5800 155.00000 5875 .46875 5950 .93750 6025 .40625
5576 .60000 5651 .06875 5726 .53750 5801 .00625 5876 .47500 5951 .94375 6026 .412
50
5577 .60625 5652 .07500 5727 .54375 5802 .01250 5877 .48125 5952 .95000 6027 .41875
5578 .61250 5653 .08125 5728 .55000 5803 .01875 5878 .48750 5953 .95625 6028 .42500
5579 .61875 5654 .08750 5729 .55625 5804 .02500 5879 .49375 5954 .96250 6029 .43125
5580 .62500 5655 .09375 5730 .56250 5805 .03125 5880 155.50000 5955 .96875 6030 .43750
5581 .63125 5656 .10000 5731 .56875 5806 .03750 5881 .50625 5956 .97500 6031 .44375
5582 .63750 5657 .10625 5732 .57500 5807 .04375 5882 .51250 5957 .98125 6032 .45000
5583 .64375 5658 .11250 5733 .58125 5808 .05000 5883 .51875 5958 .98750 6033 .45625
5584 .65000 5659 .11875 5734 .58750 5809 .05625 5884 .52500 5959 .99375 6034 .46250
5585 .65625 5660 .12500 5735 .59375 5810 .06250 5885 .53125 5960 156.00000 6035 .46875
5586 .66250 5661 .13125 5736 .60000 5811 .06875 5886 .53750 5961 .00625 6036 .47500
5587 .66875 5662 .13750 5737 .60625 5812 .07500 5887 .54375 5962 .01250 6037 .48125
5588 .67500 5663 .14375 5738 .61250 5813 .08125 5888 .55000 5963 .01875 6038 .48750
5589
.6
8125 5664 .15000 5739 .61875 5814 .08750 5889 .55625 5964 .02500 6039 .49375
5590 .68750 5665 .15625 5740 .62500 5815 .09375 5890 .56250 5965 .03125 6040 156.50000
5591 .69375 5666 .16250 5741 .63125 5816 .10000 5891 .56875 5966 .03750 6041 .50625
5592 .70000 5667 .16875 5742 .63750 5817 .10625 5892 .57500 5967 .04375 6042 .51250
5593 .70625 5668 .17500 5743 .64375 5818 .11250 5893 .58125 5968 .05000 6043 .51875
5594 .71250 5669 .18125 5744 .65000 5819 .11875 5894 .58750 5969 .05625 6044 .52500
5595 .71875 5670 .18750 5745 .65625 5820 .12500 5895 .59375 5970 .06250 6045 .53125
5596 .72500 5671 .19375 5746 .66250 5821 .13125 5896 .60000 5971 .06875 6046 .53750
5597 .73125 5672 .20000 5747 .66875 5822 .13750 5897 .60625 5972 .07500 6047 .54375
5598 .73750 5673 .20625 5748 .67500 5823 .14375 5898 .61250 5973 .08125 6048 .55000
5599 .74375 5674 .21250 5749 .68125 5824 .15000 5899 .61875 5974 .08750 6049 .55625