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
1-6
VHF Transmitter Chan
nel Designation Tables VT-3 132 - 174 MHz
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)
3425 145.12500 3500 145.50000 3575 145.87500 3650 146.25000
3
725 146.62500 3800 147.00000 3875 147.37500
3426 .13000 3501 .50500 3576 .88000 3651 .25500 3726 .63000 3801 .00500 3876 .38000
3427 .13500 3502 .51000 3577 .88500 3652 .26000 3727 .63500 3802 .01000 3877 .38500
3428 .14000 3503 .51500 3578 .89000 3653 .26500 3728 .64000 3803 .01500 3878 .39000
3429 .14500 3504 .52000 3579 .89500 3654 .27000 3729 .64500 3804 .02000 3879 .39500
3430 .15000 3505 .52500 3580 .90000 3655 .27500 3730 .65000 3805 .02500 3880 .40000
3431 .15500 3506 .53000 3581 .90500 3656 .28000 3731 .65500 3806 .03000 3881 .40500
3432 .16000 3507 .53500 3582 .91000 3657 .28500 3732 .66000 3807 .03500 3882 .41000
3433 .16500 3508 .54000 3583 .91500 3658 .29000 3733 .66500 3808 .04000 3883 .41500
3434 .17000 3509 .54500 3584 .92000 3659 .29500 3734 .67000 3809 .04500 3884 .42000
3435 .17500 3510 .55000 3585 .92500 3660 .30000 3735 .67500 3810 .05000 3885 .42500
3436 .18000 3511 .55500 3586 .93000 3661 .30500 3736 .68000 3811 .05500 3886 .43000
3437 .18500 3512 .56000 3587 .93500 3662 .31000 3737 .68500 3812 .06000 3887 .43500
3438 .19000 3513 .56500 3588 .94000 3663 .31500 3738 .69000 3813 .06500 3888 .44000
3439 .19500 3514 .57000 3589 .94500 3664 .32000 3739 .69500 3814 .07000 3889 .44500
3440 .20000 3515 .57500 3590 .95000 3665 .32500 3740 .70000 3815 .07500 3890 .45000
3441 .20500 3516 .58000 3591 .95500 3666 .33000 3741 .70500 3816 .08000 3891 .45500
3442 .21000 3517 .58500 3592 .96000 3667 .33500 3742 .71000 3817 .08500 3892 .46000
3443 .21500 3518 .59000 3593 .96500 3668 .34000 3743 .71500 3818 .09000 3893 .46500
3444 .22000 3519 .59500 3594 .97000 3669 .34500 3744 .72000 3819 .09500 3894 .47000
3445 .22500 3520 .60000 3595 .97500 3670 .35000 3745 .72500 3820 .10000 3895 .47500
3446 .23000 3521 .60500 3596 .98000 3671 .35500 3746 .73000 3821 .10500 3896 .48000
3447 .23500 3522 .61000 3597 .98500 3672 .36000 3747 .73500 3822 .11000 3897 .48500
3448 .24000 3523 .61500 3598 .99000 3673 .36500 3748 .74000 3823 .11500 3898 .49000
3449 .24500 3524 .62000 3599 .99500 3674 .37000 3749 .74500 3824 .12000 3899 .49500
3450 145.25000 3525 .62500 3600 146.00000 3675 .37500 3750 146.75000 3825 .12500 3900 147.50000
3451 .25500 3526 .63000 3601 .00500 3676 .38000 3751 .75500 3826 .13000 3901 .50500
3452 .26000 3527 .63500 3602 .01000 3677 .38500 3752 .76000 3827 .13500 3902 .51000
3453 .26500 3528 .64000 3603 .01500 3678 .39000 3753 .76500 3828 .14000 3903 .51500
3454 .27000 3529 .64500 3604 .02000 3679 .39500 3754 .77000 3829 .14500 3904 .52000
3455 .27500 3530 .65000 3605 .02500 3680 .40000 3755 .77500 3830 .15000 3905 .52500
3456 .28000 3531 .65500 3606 .03000 3681 .40500 3756 .78000 3831 .15500 3906 .53000
3457 .28500 3532 .66000 3607 .03500 3682 .41000 3757 .78500 3832 .16000 3907 .53500
3458 .29000 3533 .66500 3608 .04000 3683 .41500 3758 .79000 3833 .16500 3908 .54000
3459 .29500 3534 .67000 3609 .04500 3684 .42000 3759 .79500 3834 .17000 3909 .54500
3460 .30000 3535 .67500 3610 .05000 3685 .42500 3760 .80000 3835 .17500 3910 .55000
3461 .30500 3536 .68000 3611 .05500 3686 .43000 3761 .80500 3836 .18000 3911 .55500
3462 .31000 3537 .68500 3612 .06000 3687 .43500 3762 .81000 3837 .18500 3912 .56000
3463 .31500 3538 .69000 3613 .06500 3688 .44000 3763 .81500 3838 .19000 3913 .56500
3464 .32000 3539 .69500 3614 .07000 3689 .44500 3764 .82000 3839 .19500 3914 .57000
3465 .32500 3540 .70000 3615 .07500 3690 .45000 3765 .82500 3840 .20000 3915 .57500
3466 .33000 3541 .70500 3616 .08000 3691 .45500 3766 .83000 3841 .20500 3916 .58000
3467 .33500 3542 .71000 3617 .08500 3692 .46000 3767 .83500 3842 .21000 3917 .58500
3468 .34000 3543 .71500 3618 .09000 3693 .46500 3768 .84000 3843 .21500 3918 .59000
3469 .34500 3544 .72000 3619 .09500 3694 .47000 3769 .84500 3844 .22000 3919 .59500
3470 .35000 3545 .72500 3620 .10000 3695 .47500 3770 .85000 3845 .22500 3920 .60000
3471 .35500 3546 .73000 3621 .10500 3696 .48000 3771 .85500 3846 .23000 3921 .60500
3472 .36000 3547 .73500 3622 .11000 3697 .48500 3772 .86000 3847 .23500 3922 .61000
3473 .36500 3548 .74000 3623 .11500 3698 .49000 3773 .86500 3848 .24000 3923 .61500
3474 .37000 3549 .74500 3624 .12000 3699 .49500 3774 .87000 3849 .24500 3924 .62000
3475 .37500 3550 145.75000 3625 .12500 3700 146.50000 3775 .87500 3850 147.25000 3925 .62500
3476 .38000 3551 .75500 3626 .13000 3701 .50500 3776 .88000 3851 .25500 3926 .63000
3477 .38500 3552 .76000 3627 .13500 3702 .51000 3777 .88500 3852 .26000 3927 .63500
3478 .39000 3553 .76500 3628 .14000 3703 .51500 3778 .89000 3853 .26500 3928 .64000
3479 .39500 3554 .77000 3629 .14500 3704 .52000 3779 .89500 3854 .27000 3929 .64500
3480
.4
0000 3555 .77500 3630 .15000 3705 .52500 3780 .90000 3855 .27500 3930 .65000
3481 .40500 3556 .78000 3631 .15500 3706 .53000 3781 .90500 3856 .28000 3931 .65500
3482 .41000 3557 .78500 3632 .16000 3707 .53500 3782 .91000 3857 .28500 3932 .66000
3483 .41500 3558 .79000 3633 .16500 3708 .54000 3783 .91500 3858 .29000 3933 .66500
3484 .42000 3559 .79500 3634 .17000 3709 .54500 3784 .92000 3859 .29500 3934 .67000
3485 .42500 3560 .80000 3635 .17500 3710 .55000 3785 .92500 3860 .30000 3935 .67500
3486 .43000 356
1
.80500 3636 .18000 3711 .55500 3786 .93000 3861 .30500 3936 .68000
3487 .43500 3562 .81000 3637 .18500 3712 .56000 3787 .93500 3862 .31000 3937 .68500
3488 .44000 3563 .81500 3638 .19000 3713 .56500 3788 .94000 3863 .31500 3938 .69000
3489 .44500 3564
.8
2000 3639 .19500 3714 .57000 3789 .94500 3864 .32000 3939 .69500
3490 .45000 3565 .82500 3640 .20000 3715 .57500 3790 .95000 3865 .32500 3940 .70000
3491 .45500 3566 .83000 3641 .20500 3716 .58000 3791 .95500 3866 .33000 3941 .70500
3492 .46000 3567 .83500 3642 .21000 3717 .58500 3792 .96000 3867 .33500 3942 .71000
3493 .46500 3568 .84000 3643 .21500 3718 .59000 3793 .96500 3868 .34000 3943 .71500
3494 .47000 3569 .84500 3644 .22000 3719 .59500 3794 .97000 3869 .34500 3944 .72000
3495 .47500 3570 .85000 364
5
.22500 3720 .60000 3795 .97500 3870 .35000 3945 .72500
3496 .48000 3571 .85500 3646 .23000 3721 .60500 3796 .98000 3871 .35500 3946 .73000
3497 .48500 3572 .86000 3647 .23500 3722 .61000 3797 .98500 3872 .36000 3947 .73500
3498 .49000 3573 .86500 3648
.2
4000 3723 .61500 3798 .99000 3873 .36500 3948 .74000
3499 .49500 3574 .87000 3649 .24500 3724 .62000 3799 .99500 3874 .37000 3949 .74500