Codan Radio Communications VT-3A130-S-FSH VHF AM Transmitter Instruction Manual
TM
DANIELS
ELECTRONICS LTD.
MT-3 RADIO SYSTEMS
VHF AM TRANSMITTER
INSTRUCTION MANUAL
VT-3AM
118 - 138 MHz
Covers Family Model: VT-3A130-SYD410
Copyright © 2000 Daniels Electronics Ltd. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system or transmitted in any form o r 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: 2 Previous Issue: 1
Issue Date: March 2000 Previous Issue Date: May 1997 Daniels Electronics Ltd.
Printing Date: March 2000 Victoria, BC.
Part No.: IM22-VT3A130 PRINTED IN CANADA
Reviewed By:
Quality Assurance:
Claudia Borman _________________
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.
DANIELS
ELECTRONICS
DE
ii VT-3A130 VHF AM Transmitter Instruction Manual
TABLE OF CONTENTS
Page
1 GENERAL..................................................................................... 1-1
1.1 Introduction.............................................................................. 1-1
1.2 Manual Organization.................................................................... 1-1
1.3 Performance Specifications............................................................ 1-2
1.3.1 Transmitter Specifications........................................................... 1-2
1.3.2 Audio Specifications................................................................. 1-4
1.3.3 Physical Specifications.............................................................. 1-4
2 SYSTEM OVERVIEW....................................................................... 2-1
2.1 Transmitter Operation................................................................... 2-1
2.2 Frequency Selection .................................................................... 2-2
2.2.1 BCD Switch Option.................................................................. 2-2
2.2.2 Frequency Select Handle Option................................................... 2-2
2.3 Transmitter Assembly and Alignment ................................................ 2-3
2.3.1 Complete Transmitter Alignment................................................... 2-3
2.3.2 Output Power Adjustment........................................................... 2-3
2.4 Recommended Test Equipment List .................................................. 2-4
2.5 Repair Note.............................................................................. 2-4
2.6 Prin ted Circuit board Numbe ring Conven tion........................................ 2-4
3 ILLUSTRATIONS ........................................................................... 3-1
3.1 MT-3 Transmitter Front Panel......................................................... 3-1
3.2 MT-3 Transmitter Case - Exploded View ............................................ 3-2
4 REVISION HISTORY....................................................................... 4-1
MODULE MANUALS
MT-3 AM Transmitter Main Board Instruction Manual ............ IM22-MT3AMTXMN
VT-3A130 Amplifier Instruction Manual ............................. IM22-VT3A130AMP
Enhanced AM/FM Synthesizer Instruction Manual.......................... IM10-OS3AH
VHF AM Transmitter Channel Designation Tables................... IM12VRT3A130CT
Frequency Select Handle Instruction Manual....................................IM12-FSH3
DANIELS
ELECTRONICS
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VT-3A130 VHF AM Transmitter Instruction Manual iii
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DANIELS
ELECTRONICS
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iv VT-3A130 VHF AM Transmitter Instruction Manual
1 GENERAL
1.1 Introduction
The VT-3A130 Transmitter is a synthesized multichannel AM transmitter designed to interface with
the MT-3 Repeater Systems, while still maintaining MT-2 system compatibility. Both MT-3
systems are characterized by dependable low maintenance performance under the most severe
environmental conditions. All performance measurements comply with Industry Canada (IC)
Standar d Specification RSS 119 and 140, as well as the Federal Communications Commission
Part 87 for AM equipment. In addition, all units are burnt-in for 24 hours and are accompanied by
a complete test report.
The VT-3A130 Transmitter operates in the 118 - 138 MHz aviation band. The transmitter's
frequency stability is controlled by an OST-3A128 Synthesizer. The synthesizer module can be
programmed to have up to 16 channels. A channel programmer can preprogram the first 15
channels; channel 16 can be programmed from the front panel and channel 1 can be programmed
by the four BCD switches located on the MT-3 AM Transmitter Main Board.
1.2 Manual Organization
The organization of this manual reflects the modular makeup of the VT-3 product line. Each
module is fully described within its respective submanual, all o f which are contained within this
document. In general, each submanual contains:
1. A functional description and specification summary.
2. A detailed technical description (Theory of Operation).
3. Assembly, setup and alignment procedures relevant to that particular module.
* Note * Material presented in a given "sub-manual" may include information related to other
module versions not directly applicable to the VT-3A130 transmitter family. The OS-3H
synthesizer module is a prime example, having family members covering from 29 to 512 MHz.
DANIELS
ELECTRONICS
DE
VT-3A130 VHF AM Transmitter Instruction Manual 1-1
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