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
4-4
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)
6575 159.84375 6650 160.31250 6725 160.78125 6800 161.25000 6875 161.71875 6950 162.18750 7025 162.65625
6576 .85000 6651 .31875 6726 .78750 6801 .25625 6876 .72500 6951 .19375 7026 .66250
6577 .85625 6652 .32500 6727 .79375 6802 .26250 6877 .73125 6952 .20000 7027 .66875
6578 .86250 6653 .33125 6728 .80000 6803 .26875 6878 .73750 6953 .20625 7028 .67500
6579 .86875 6654 .33750 6729 .80625 6804 .27500 6879 .74375 6954 .21250 7029 .68125
6580 .87500 6655 .34375 6730 .81250 6805 .28125 6880 161.75000 6955 .21875 7030 .68750
6581 .88125 6656 .35000 6731 .81875 6806 .28750 6881 .75625 6956 .22500 7031 .69375
6582 .88750 6657 .35625 6732 .82500 6807 .29375 6882 .762
50
6957 .23125 7032 .70000
6583 .89375 6658 .36250 6733 .83125 6808 .30000 6883 .76875 6958 .23750 7033 .70625
6584 .90000 6659 .36875 6734 .83750 6809 .30625 6884 .77500 6959 .24375 7034 .71250
6585 .90625 6660 .37500 6735 .84375 6810 .31250 6885 .78125
6
960 162.25000 7035 .71875
6586 .91250 6661 .38125 6736 .85000 6811 .31875 6886 .78750 6961 .25625 7036 .72500
6587 .91875 6662 .38750 6737 .85625 6812 .32500 6887 .79375 6962 .26250 7037 .73125
6588 .92500 6663 .39375 6738 .86250 6813 .33125 6888 .80000
69 63
.26875 7038 .73750
6589 .93125 6664 .40000 6739 .86875 6814 .33750 6889 .80625 6964 .27500 7039 .74375
6590 .93750 6665 .40625 6740 .87500 6815 .34375 6890 .81250 6965 .28125 7040 162.75000
6591 .94375 6666 .41250 6741 .88125 6816 .35000 6891 .81875 696
6
.28750 7041 .75625
6592 .95000 6667 .41875 6742 .88750 6817 .35625 6892 .82500 6967 .29375 7042 .76250
6593 .95625 6668 .42500 6743 .89375 6818 .36250 6893 .83125 6968 .30000 7043 .76875
6594 .96250 6669 .43125 6744 .90000 6819 .36875 6894 .83750 6969
.3
0625 7044 .77500
6595 .96875 6670 .43750 6745 .90625 6820 .37500 6895 .84375 6970 .31250 7045 .78125
6596 .97500 6671 .44375 6746 .91250 6821 .38125 6896 .85000 6971 .31875 7046 .78750
6597 .98125 6672 .45000 6747 .91875 6822 .38750 6897 .85625 6972 .32500 7047 .79375
6598 .98750 6673 .45625 6748 .92500 6823 .39375 6898 .86250 6973 .33125 7048 .80000
6599 .99375 6674 .46250 6749 .93125 6824 .40000 6899 .86875 6974 .33750 7049 .80625
6600 160.00000 6675 .46875 6750 .93750 6825 .40625 6900 .87500 6975 .34375 7050 .81250
6601 .00625 6676 .47500 6751 .94375 6826 .41250 6901 .88125 6976 .35000 7051 .81875
6602 .01250 6677 .48125 6752 .95000 6827 .41875 6902 .88750 6977 .35625 7052 .82500
6603 .01875 6678 .48750 6753 .95625 6828 .42500 6903 .89375 6978 .36250 7053 .83125
6604 .02500 6679 .49375 6754 .96250 6829 .43125 6904 .90000 6979 .36875 7054 .83750
6605 .03125 6680 160.50000 6755 .96875 6830 .43750 6905 .90625 6980 .37500 7055 .84375
6606 .03750 6681 .50625 6756 .97500 6831 .44375 6906 .91250 6981 .38125 7056 .85000
6607 .04375 6682 .51250 6757 .98125 6832 .45000 6907 .91875 6982 .38750 7057 .85625
6608 .05000 6683 .51875 6758 .98750 6833 .45625 6908 .92500 6983 .39375 7058 .86250
6609 .05625 6684 .52500 6759 .99375 6834 .46250 6909 .93125 6984 .40000 7059 .868
75
6610 .06250 6685 .53125 6760 161.00000 6835 .46875 6910 .93750 6985 .40625 7060 .87500
6611 .06875 6686 .53750 6761 .00625 6836 .47500 6911 .94375 6986 .41250 7061 .88125
6612 .07500 6687 .54375 6762 .01250 6837 .48125 6912 .95000 6987 .41875 7062 .8875
0
6613 .08125 6688 .55000 6763 .01875 6838 .48750 6913 .95625 6988 .42500 7063 .89375
6614 .08750 6689 .55625 6764 .02500 6839 .49375 6914 .96250 6989 .43125 7064 .90000
6615 .09375 6690 .56250 6765 .03125 6840 161.50000 6915 .96875 6990 .43750 7065 .90625
6616 .10000 6691 .56875 6766 .03750 6841 .50625 6916 .97500 6991 .44375 7066 .91250
6617 .10625 6692 .57500 6767 .04375 6842 .51250 6917 .98125 6992 .45000 7067 .91875
6618 .11250 6693 .58125 6768 .05000 6843 .51875 6918 .98750 6993 .45625 7068 .92500
6619 .11875 6694 .58750 6769 .05625 6844 .52500 6919 .99375 6994 .46250 7069 .93125
6620 .12500 6695 .59375 6770 .06250 6845 .53125 6920 162.00000 6995 .46875 7070 .93750
6621 .13125 6696 .60000 6771 .06875 6846 .53750 6921 .00625 6996 .47500 7071 .94375
6622 .13750 6697 .60625 6772 .07500 6847 .54375 6922 .01250 6997 .48125 7072 .95000
6623 .14375 6698 .61250 6773 .08125 6848 .55000 6923 .01875 6998 .48750 7073 .95625
6624 .15000 6699 .61875 6774 .08750 6849 .55625 6924 .02500 6999 .49375 7074 .96250
6625 .15625 6700 .62500 6775 .09375 6850 .56250 6925 .03125 7000 162.50000 7075 .96875
6626 .16250 6701 .63125 6776 .10000 6851 .56875 6926 .03750 7001 .50625 7076 .97500
6627 .16875 6702 .63750 6777 .10625 6852 .57500 6927 .04375 7002 .51250 7077 .98125
6628 .175
00
6703 .64375 6778 .11250 6853 .58125 6928 .05000 7003 .51875 7078 .98750
6629 .18125 6704 .65000 6779 .11875 6854 .58750 6929 .05625 7004 .52500 7079 .99375
6630 .18750 6705 .65625 6780 .12500 6855 .59375 6930 .06250 7005 .53125 7080 163.00000
6631 .1937
5
6706 .66250 6781 .13125 6856 .60000 6931 .06875 7006 .53750 7081 .00625
6632 .20000 6707 .66875 6782 .13750 6857 .60625 6932 .07500 7007 .54375 7082 .01250
6633 .20625 6708 .67500 6783 .14375 6858 .61250 6933 .08125 7008 .55000 7083 .01875
6634 .21250
67 09
.68125 6784 .15000 6859 .61875 6934 .08750 7009 .55625 7084 .02500
6635 .21875 6710 .68750 6785 .15625 6860 .62500 6935 .09375 7010 .56250 7085 .03125
6636 .22500 6711 .69375 6786 .16250 6861 .63125 6936 .10000 7011 .56875 7086 .03750
6637 .23125 6712
.
70000 6787 .16875 6862 .63750 6937 .10625 7012 .57500 7087 .04375
6638 .23750 6713 .70625 6788 .17500 6863 .64375 6938 .11250 7013 .58125 7088 .05000
6639 .24375 6714 .71250 6789 .18125 6864 .65000 6939 .11875 7014 .58750 7089 .05625
6640 160.25000 6715
.7
1875 6790 .18750 6865 .65625 6940 .12500 7015 .59375 7090 .06250
6641 .25625 6716 .72500 6791 .19375 6866 .66250 6941 .13125 7016 .60000 7091 .06875
6642 .26250 6717 .73125 6792 .20000 6867 .66875 6942 .13750 7017 .60625 7092 .07500
6643 .26875 6718 .73750 6793 .20625 6868 .67500 6943 .14375 7018 .61250 7093 .08125
6644 .27500 6719 .74375 6794 .21250 6869 .68125 6944 .15000 7019 .61875 7094 .08750
6645 .28125 6720 160.75000 6795 .21875 6870 .68750 6945 .15625 7020 .62500 7095 .09375
6646 .28750 6721 .75625 6796 .22500 6871 .69375 6946 .16250 7021 .63125 7096 .10000
6647 .29375 6722 .76250 6797 .23125 6872 .70000 6947 .16875 7022 .63750 7097 .10625
6648 .30000 6723 .76875 6798 .23750 6873 .70625 6948 .17500 7023 .64375 7098 .11250
6649 .30625 6724 .77500 6799 .24375 6874 .71250 6949 .18125 7024 .65000 7099 .11875