Instruction Manual

ManualsBrandsCodan Radio Communications ManualsElectronicsTransmitter

DANIELS

ELECTRONICS LTD.

MT-3 RADIO SYSTEMS

MT-3 AM TRANSMITTER

MAIN BOARD

INSTRUCTION MANUAL

Covers:

A22-VAP130 AM Audio Processor Version 04

A21-TX3-00 TXMAIN/FPB Common Asembly Version 1.7

reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,

mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels

Electronics Ltd.

DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent

and Trademark Office.

Issue: 3 Previous Issue: 2

Issue Date: December 98 Previous Issue Date: March 98 Daniels Electronics Ltd.

Printing Date: N/A Victoria, BC

Part No.: IM22-MT3AMTXMN PRINTED IN CANADA

Summary of content (40 pages)

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DANIELS TM ELECTRONICS LTD. MT-3 RADIO SYSTEMS MT-3 AM TRANSMITTER MAIN BOARD INSTRUCTION MANUAL Covers: A22-VAP130 AM Audio Processor Version 04 A21-TX3-00 TXMAIN/FPB Common Asembly Version 1.7 Copyright © 1998 Daniels Electronics Ltd. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written consent of Daniels Electronics Ltd.
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Reviewed By: Quality Assurance: Larry Freeman Name Signature _________________ Date NOTE: The user's authority to operate this equipment could be revoked through any changes or modifications not expressly approved by Daniels Electronics Ltd. The design of this equipment is subject to change due to continuous development. This equipment may incorporate minor changes in detail from the information contained in this manual.
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TABLE OF CONTENTS Page 1 GENERAL...................................................................................... 1-1 1.1 Introduction........................................................................... 1-1 1.2 Performance Specifications ......................................................... 1-1 1.2.1 General ....................................................................... 1-1 1.2.2 Audio Specifications........................................................
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3.6.1 General....................................................................... 3.6.2 MT-3 AM Transmitter Board Test Points................................ 3.7 Module Installation and Removal.................................................. 3.8 MT-3 AM Audio Processor Alignment ........................................... 3.8.1 General....................................................................... 3.8.2 MT-3 AM Audio Processor Adjustment ................................
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1 GENERAL 1.1 Introduction The MT-3 AM Transmitter Main Board integrates the MT-3 Front Panel Board, MT-3 AM Audio Processor, Synthesizer or Crystal Control module and Amplifier module together to make a working MT-3 AM series transmitter (see section 5.1: MT-3 AM Transmitter Block Diagram). The Front Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the Amplifier and the Synthesizer or Crystal Control module are frequency band sensitive, plug-in modules.
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1.2.2 Audio Specifications Audio Input: -30 to 0 dBm into a 600Ω balanced load.
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2 THEORY OF OPERATION 2.1 MT-3 AM Transmitter Main Board 2.1.1 General Switch SW1 on the Front Panel Board is a DPDT switch which controls the operation of the transmitter as discussed in the operations section of the Transmitter Manual. When SW1 is in the 'OFF' position the transmitter is turned off; however, +13.8 Vdc is still present on the Transmitter Main Board as the +13.8 Vdc supply is not switched. When SW1 is in the 'KEYED' position, +9.
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2 . 1 . 2 . 2 PTT With Time-Out-Timer Pins B10 and Z10 of the backplane connector are the PTT WTO input. When the PTT WTO signal, which is normally high, falls below +2.0 Vdc, the transmitter is keyed. The transmitter is disabled when the PTT WTO input rises above +2.3 Vdc or if the TOT's time-out period is exceeded. If the time-out period is exceeded the PTT WTO input must go high (>+2.3 Vdc) and then low again in order to rekey the transmitter. The PTT WTO threshold of approximately +2 Vdc (0.
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To configure the isolated input for PTT NTO operation jumpers J2, J4, must be in the 'x' position J3 must be in the 'y' position. In this mode, pins B14 and Z14 no longer function as the PTT NTO input; however, pins B10 and Z10 continue to function as the normal PTT WTO input. 2 . 1 . 2 . 5 PTT Output Pin B24 on the backplane connector is an open drain output (Q9) which is pulled low anytime the transmitter is keyed and the synthesizer is locked.
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•MODE 1: Jumper J6 out - the audio processor is switched by a PTT signal - the synthesizer or crystal module is switched by a PTT signal - standby current: Synthesized - typically 13 mA Crystal Controlled - typically 6 mA - start-up time: Synthesized - typically 40 ms Crystal Controlled - typically 40 ms •MODE 2: Jumper J6 in, jumper J7 in the 'y' position, jumper J18 in the 'x' position - the audio processor is switched by a PTT signal - the synthesizer or crystal module is enabled all of the time - standb
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2 . 1 . 3 . 1 Microphone Audio Normally the audio from a transmitter's microphone is transmitted by that transmitter; however, the Transmitter Main Board can be configured by the MIC IN and MIC OUT lines so that the audio from an external microphone modulates transmitter. The configuration of the MIC IN (pin Z4) and MIC OUT (pin B4) lines on the MT-3 Transmitter Board are controlled by jumpers J16 and J17 respectively. Jumper J16 selects the audio source for the MT-3 AM Audio Processor's microphone input.
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2.1.5 Amplifier Circuits The MT-3A series Amplifier has 5 connections that are cabled to the transmitter board: +13.8 Vdc, +9.5 Vdc, Enable, Mod and Gnd. The +13.8 Vdc supply (JP1-3) is always on while the +9.5 Vdc supply (JP1-2) is always switched by a PTT signal. The enable line (JP1-1) is active low and is controlled by the Qualified PTT signal from the synthesizer. Jumpers J12, J13, J14, and J15 are not installed. 2.
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2.3.3 Audio Circuitry The MT-3 AM Tx Audio Processor refer to section 5.4.2 "MT-3 AM Audio Processor Schematic Diagram" has two audio inputs (Microphone input and Balanced input) which can be used to modulate the transmitter. The input signals are combined by R2 and R17 at a compandor U1. U1b controls the input level and makes gain inversely proportional to the input level (say a 20 dB drop in input level will produced a 20 dB increase in gain).
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2.3.4 PTT Time-Out-Timer The PTT time-out-timer (TOT) is a relatively independent circuitry located on the Transmitter Board. The TOT is powered from the continuous +9.5 Vdc supply (J34) and is programmable for various time-out periods. The TOT input is normally high and in this state the timer is disabled. When the input trigger level falls below +2.0 Vdc, the timer is activated, and the transmitter is keyed. If the input trigger rises above +2.
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3 TRANSMITTER ALIGNMENT 3.1 General Transmitter alignment is simplified by using an M-3 Subrack, SM-3 System Monitor, and RF extender cable to provide transmitter power and signal interconnection. Alternatively, +9.5 Vdc and +13.8 Vdc may be applied directly to a transmitter module through positive connection for the +9.5 Vdc to pins B6 and Z6, for the +13.8 Vdc to pins B2 and Z2, and negative connection to pins B30, Z30, B32, and Z32. Transmitter balanced audio (600 Ω) is available at pins B18 and Z18.
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Radio communications test set : VSWR 3:1 mismatch load: Alignment Tool: Marconi Instruments 2955R JFW 50T-035-3.0:1 Johanson 4192 It is recommended that the radio communications test set be frequency locked to an external reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to within its ±1 ppm frequency tolerance. 3.
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•Jumper J27: •Jumper J28: •Jumper J29: •Jumper J31: •Jumper J32: •Jumper J33: •Jumper J34: •Jumper J35: 3.5.
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3.6.2 MT-3 AM Transmitter Board Test Points TP1: TP2: TP3: TP4: TP5: TP6: TP7: TP8: TP9: TP10: TP11: TP12: TP13: TP14: TP15: TP16: TP17: TP18: TP19: TP20: TP21: TP22: TP23: TP24: TP25: TP26: TP27: TP28: TP29: TP31: TP32: TP33: TP34: 3.7 not used microphone audio microphone PTT WTO; inactive +9.5 Vdc, active 0 Vdc microphone PTT NTO; inactive +9.5 Vdc, active 0 Vdc +9.5 Vdc from backplane connector +9.5 Vdc from front panel board +9.5 Vdc Switched Qualified PTT; inactive +9.
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To remove the Enhanced Synthesizer or Crystal Controlled Oscillator module, simply remove the center screw from the module lid and pull the module out. The module should be pulled straight out so that the four alignment pins do not bend or damage the circuitboard. 3.8 MT-3 AM Audio Processor Alignment 3.8.1 General Verify the standard factory settings for the MT-3 AM Audio Processor as given in section 3.5.2 before beginning the standard modulation adjustment procedure.
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11) Slowly increase the input audio signal level to 5 dBm and observe that the modulation does not go over 100%. This step verifies the correct operation of the ALC . 12) Change 13.8Vdc power supply to 10V and then to 17V, the modulation of the output RF signal should remain at the same level of 90% ±7% and distortion should be less then 3%. If not, adjust the pot R4 on the Audio Processor Board to achieve this. This step verifies the correct operation of the AMC. 13) Repeat steps 7 and 9 if required.
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4 TRANSMITTER INTERCONNECT PIN DEFINITIONS The MT-3 AM series Transmitter employs a 48 pin Eurostandard connector for interfacing to all transmitter power, audio, and control functions. The following are the MT-3 AM series Transmitter backplane connections to the M-3 Motherboard.
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This Page Intentionally Left Blank DANIELS DE ELECTRONICS 4-2 MT-3 AM Transmitter Main Board Instruction Manual
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LSB MSB 5 5.1 6 5 4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS 7 8 9 Transmitter Block Diagram 0 1 3 2 6 5 4 7 8 9 6 5 4 3 2 7 8 9 0 1 6 5 4 3 2 7 8 9 0 1 3 2 0 1 BACKPLANE CONNECTOR MT-3 FRONT PANEL BOARD B2 FUSE (OPTIONAL) +9.5V 10-17 VOLTS + 13.8 VDC NOMINAL +13.8VDC B6 Z2 +9.5 VDC +9.5 VDC CONTINUOUS RX AUDIO / +13.8V Z6 +9.5V OUTPUT J9 +9.5VDC MIC AUDIO SQL DE-EMP INPUT B20 LED ENA REFERENCE INPUT MIC PTT NTO +9.
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This Page Intentionally Left Blank DANIELS DE ELECTRONICS 5-2 MT-3 AM Transmitter Main Board Instruction Manual
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5.2 MT-3 AM Transmitter Board Electrical Assembly 5.2.1 MT-3 AM Transmitter Board Top Side Component Layout R42 OPT ENA +9.5V 13.
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MT-3 AM Transmitter Main Board Component Layout (Bottom) y LPF34 LPF33 J14 x LPF32 x J13 y J12 Q10 PZT 2222 C2 1µF + 35V J9 7 C1 + 10µF 35V ORG BLUE RED LPF35 R25 27k4 BLK xx J15 J15 yy 6 5 4 3 2 y J25 x 1 R41 15K YEL 5.2.2 R26 1k00 GND: BLACK R40 10K C10 1 µF LPF31 LPF30 MODULATION INPUT: YELLOW LPF29 LPF28 U4 MMAD1108 LPF27 LPF26 LPF25 U3 MMAD1108 LPF24 + 13.8 VDC: RED C20 + 4.
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5.2.3 Transmitter Main Board Schematic Diagram LPF16 B6 TP6 LPF TP5 LPF17 Z6 C3 10uF LPF MT-3 FRONT PANEL BOARD C4 1.0uF JF2-1 TP1 +9.5V INPUT 6 5 4 +9.5V OUTPUT SPARE J9 JF1-2 TP2 RX AUDIO +13.8V LPF22 SQL DE-EMP INPUT B20 LPF C10 1.0uF JF1-1 C13 10nF C12 10nF FSW2 FSW1 +9.5V CONTINUOUS MIC AUDIO GROUND TP4 MSD 7 8 TO ALL 9.5V SUPPLY POINTS JF2-4 JF3-1 9 0 1 13.
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5.3 5.3.1 MT-3 Front Panel Board MT-3 Front Panel Board Component Layout Factory Installed Solder Jumper. Solder Jumper On Solder Side Of PCB.
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5.3.2 PF3-1 PF3-2 PF3-4 PF3-3 MT-3 Front Panel Board Schematic PF3 1 2 4 P1 SPARE SPARE +13.8V RX MON 8 +13.8V 7 RX AUDIO 6 +9.5V OUT 5 RX MON 4 MIC PTT 3 MIC INPUT 2 3 1 +9.5V IN SW1 F NORM C +9.5V OUT E B D A PF2 PF2-1 PF2-4 KEYED D1 LED ENA PF2-3 MIC PTT NTO PF2-2 J1 PF1 3 X MIC PTT Y MIC PTT WTO J2 PF1-3 MIC-3 Y 4 X RX AUDIO 2 MIC 3 MIC-4 2 PF1-2 MIC-2 MIC INPUT 1 1 PF1-1 C1 N/I 4 MIC-1 PF1-4 DE TITLE: DANIELS ELECTRONICS VICTORIA B.C .
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5.4 MT-3 AM Audio Processor Electrical Assembly 5.4.1 MT-3 AM Audio Processor Component Layout R1 5k0 Microphone Input Level Adjust R4 50k0 Automatic Modulation Control Input Adjust D2 1N5221B R16 5k0 Balanced Input Level Adjust C8 680nF C3 680nF C12 4.7uF D1 1N5221B P8 R14 100k0 Modualtion Control Output Adjust P5 C19 1.0uF U2 MC33174 C21 4.7uF C11 2.2uF FB 1 U1 SA571D P1 1 C2 470nF P5 1 3 2 wo # xxxx 4 2 C9 4.
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5.4.2 MT-3 AM Audio Processor Schematic Diagram 8.0V 8.0V C14 100nF JU9 C6 100nF Automatic Modulation Control R3 49K9 TP5 C15 4.7nF C7 10nF U1a SA571D U2a MC33174 R15 49K9 R29 5K11 AMC Bypass TP1 Microphone Input Level Adjust CW P1 Microphone C2 470nF R2 20K0 Var G Output FB1 TP6 3 JU1 7 Y C5 470nF 6 R9 10K0 1 2 2 Rect In R18 470K0 C13 1.0nF 7 U2 c MC33174 R28 82K5 10 U2 d MC33174 8 9 C25 150pF R25 82K5 R14 100K0 13 C20 220pF C19 1.
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5.4.3 TX Time-Out-Timer Electrical Assembly 5.4.3.1 TX Time-Out-Timer Component Layout J8-1 R17 R11 1k00 15k0 Q1 BC807-25 U2 R8 100k R7 1k00 R10 10k0 R3 68k1 R12 opt. R6 221k R5 27k4 C2 J5-1 100nF JU3 J5-1 JU5 JU4 JU6 J8-1 JU1 R13 221k R14 221k R15 221k JU2 R16 221k C1 C4 100nF R1 C3 221k 100nF U1 4.7µF MC14536B R4 R2 1k00 27k4 R9 221k J6-1 MC33172 J7-1 50027-02 5.4.3.2 J6-1 J7-1 MT3APM3 MT3APM5 TX Time-Out-Timer Schematic Diagram INSTALL JUMPERS +9.
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6 PARTS LISTS 6.1 Transmitter Main Board Parts List 6.1.1 Transmitter Main Board Electrical Parts List Ref Design Description Part No.
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Ref Design Description Part No R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 RES, SM, 10R0 0805, 1% 100ppm RES, SM, 27K4 0805, 1% 100ppm RES, SM, 1K0 0805, 1% 100ppm RES, SM, 27K4 0805, 1% 100ppm RES, SM, 221K0 0805, 1% 100ppm RES, SM, 100K0 0805, 1% 100ppm RES, SM, 27K4 0805, 1% 100ppm RES, SM, 27K4 0805, 1% 100ppm RES, SM, 27K4 0805, 1% 100ppm RES, SM, 10K0 0805, 1% 100ppm RES, SM, 10K0
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Ref Design Description Part No. U7 U8 IC, MC33172 DUAL OP AMP, SO-8 IC, MC14536B PROGRAM TIMER, SO-16W 2302-33172N08 2375-45360W16 6.1.2 Transmitter Main Board Mechanical Parts List Description Part No. Qty. CABLE, SMB-SMB PLUG, RG316,12cm CABLE, SMA-SMB PLUG, RG188,15cm CABLE, SMA PLUG-PLUG, RG188, 19 cm $7910-WP0WP012 $7910-SP0WP015 $7910-SP0SP019 1 (Crystal Control) 1 (Synthesizer) 1 (Opt.
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Description Part No. Qty. WIRE, TFE/STRAND., 24AWG, BLACK (9.0 sm) WIRE, TFE/STRAND., 24AWG, BROWN (16.0sm) 7121-24S19360 7121-24S19361 1 1 6.1.3 MT-3 Front Panel Board Electrical Parts List Ref Desig Description Part No. D1 LED, RED, 5 mm OD, T-1 3/4 2010-503001RD PF1 PF2 HEADER, 0.1", RA, 2 ROW X 2 PIN HEADER, 0.1", RA, 2 ROW X 2 PIN 5010-H202RA9T 5010-H202RA9T SW1 SWITCH, TOG/DPDT, ON-OFF-ON, PCB/STR 5215-T2031V02 PCB MT-3 TX FRONT PANEL 4321-40921211 6.
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Ref Design Description Part No P1-P5 PCB HEADER 01", R/A, 2 ROW X 2PIN AUDIO PROCESSOR, VT-3A130 5010-H202RA9T 4322-30500494 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R13 R14 R15 R16 R17 R18 R19 R20 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 POT., SM, 5K0 4mm SQ, 11T,SIDE RES., SM, 20K0 0805, 1%,100ppm RES., SM, 49K9 0805, 1%,100ppm POT., SM, 50K0 4mm SQ, 50K, 11T,SIDE RES., SM, 30K9 0805, 1%,100ppm RES., SM, 100K0 0805, 1%,100ppm TEMPSISTOR, 1K2 PTC, 10%,AXIAL RES., SM, 4K75 0805, 1%,100ppm RES.
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7 REVISION HISTORY ISSUE DATE REVISION 1 May 97 • First Issue. 2 March 98 • To improve performance and efficiency of the Audio Processor Board. ECO #541. - C18 was 82pF is now 150pF - R20 was 8k25 is now 3k01 - R21 was 1M0 is now not installed - R26 was 470k is now 3M30 - Moved SM jumpers to the SM side of the PCB. Moved P1, P2 & P5 to the correct positions. Added land pattern to the PCB for R21.
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