Codan Radio Communications AMP 3A130 Users manual
DANIELS
ELECTRONICS LTD.
MT-3 RADIO SYSTEMS
25W AM POWER AMP
INSTRUCTION MANUAL
AMP-3
118 - 138 MHz
TM
Covers Model: AMP-3A130-25-00
Copyright © 2002 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.
DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent and Trademark Office.
Printing Date: Nov 2002 Daniels Electronics Ltd.
Issue Date: Nov 2002 Previous Issue Date: N/A Victoria, BC
Issue: 1 Previous Issue: N/A
Document No.: IM71-AMP3A130-25 PRINTED IN CANADA
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 LTD.
TM
ii 25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25
PG
4πR
RF Exposure Warning
This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human
beings to radio frequency electromagnetic energy, as defined in the following national and international standards
and guidelines:
1. Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and
Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to
Radio Frequency Fields ;
2. Health Canada Safety Code 6, Limits of Human Exposure to Radiofrequency Electromagnetic Fields in
the Frequency Range from 3 kHz to 300 GHz 1;
3. United States Federal Communications Commission, Code of Federal Regulations; 47 CFR Part 1,
§ 1.1310 Radiofrequency radiation expos ure limits; and
4. American National Standards Institute (ANSI) criteria for localized SAR in Section 4.2 of “IEEE
Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields,
3 kHz to 300 GHz”2.
Notes :
A. The SAR limit for uncontrolled exposure of persons not classed as RF and microwave exposed workers
(including the general public) for transmitter equipment operating below 10 GHz, as defined in the
references above, is 2 W/m2 (0.2 mW/cm2 ).
B. This transmittin g equipment is designed for use with an outdoor antenna with a characteristic antenna
gain of 10 dBi, typically mounted at a significant height above ground to provide for adequate signal
coverage. To ensure that the general public is not exposed to a power density above the recommended
limit of 2 W/m2 (0.2 mW/cm2), the equipment must be installed such that the following minimum safe
distances from the antenna are maintained:
6.0 m (19.7 ft) when configured with 25 W AM PA (at 90% modulation)
2.4 m (7.9 ft) standalone (i.e. no PA) 4 W AM TX (at 90% modulation)
C. The following power density formula has been utilized in determining minimum safe distances:
S =
2
where: S = Power density (in appropriate units, e.g. W/ m2 )
P = Power input to the Antenna (in appropriate units, e.g., W)
G = Power gain of the antenna in the direction of interest relative to an isotropic radiator
R = Distance to the center of radiation of the antenna (appropriate units, e.g., m)
1
Minister of Public Works and Government S ervices, Canada 1999, Cat. H46- 2/ 99- 237E, ISBN 0- 662- 28032- 6
2
ANSI/IEEE C95.1 –1992, Copyright 1992 by the Institute of Electrical and Electronics Engineers, Inc., New York, New York 10017
RF Exposure Warning
TABLE OF CONTENTS
Page
1 GENERAL................................................................................................................1-1
1.1 Introduction .................................................................................................... 1-1
1.2 Performance Specifications............................................................................. 1-1
1.3 Physical Specifications ................................................................................... 1-2
2 THEORY OF OPERATION.....................................................................................2-1
2.1 General............................................................................................................2-1
2.2 Control Board Circuitry ................................................................................. 2-1
2.3 RF Amplifier Circuitry................................................................................... 2-2
2.4 Printed Circuit board Numbering Convention ................................................ 2-3
3 INSTALLATION AND SITE OPERATION...........................................................3-1
4 AMPLIFIER ALIGNMENT.....................................................................................4-1
4.1 Recommended Test Equipment List ..............................................................4-1
4.2 RF Amplifier Board Alignment ...................................................................... 4-3
4.3 Control Board Alignment ...............................................................................4-5
5 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS...........................................5-1
5.1 Rack Mounting Positions ............................................................................... 5-1
5.2 RF Power Amplifier Block Diagram ..............................................................5-2
5.3 RF Power Amplifier Exploded View.............................................................. 5-3
5.4 RF Power Amplifier Board - Component Layout ........................................ 5-4
5.5 RF Power Amplifier Board - Schematic ........................................................ 5-5
5.6 Control Board - Component Layout .............................................................. 5-6
5.7 Control Board - Schematic.............................................................................. 5-7
6 PARTS LISTS..........................................................................................................6-1
6.1 RF Power Amplifier Board Electrical Parts List ............................................ 6-1
6.2 RF Power Amplifier Board Mechanical Parts List ........................................6-3
6.3 Control Board Electrical Parts List................................................................. 6-4
6.4 Control Board Mechanical Parts List ............................................................. 6-7
7 REVISION HISTORY..............................................................................................7-1
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ELECTRONICS LTD.
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iv 25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25
1 GENERAL
1.1 Introduction
The AMP-3A130-25 provides the final stage of RF amplification and filtering for the AM amplifier
AMP-3A130-25, 118 - 138 MHz family. The amplifier covers 118 - 138 MHz with continuously
adjustable 10.0 to 25.0 W of output power.
The amplifier is packaged in the compact Eurostandard (5"h x 2.8"w x 7.5"d) housing, and is
robustly designed for mountain top or transportable applications. The amplifier modules use high
reliability components and each is accompanied with a complete operational test report on delivery.
1.2 Performance Specifications
Frequency: 118 to 138 MHz
Output Power: 10-25 Watts Continuous (set by VT-3A exciter)
Output Impedance: 50 Ω
Spurious & Harmonics: ≤ -80 dBc
Distortion ≤ 5% at 30% modulation
≤ 10% at 90% modulation @ 25ºC
Operating Voltage: +24 to 32 Vdc (28.0 Vdc Nominal)
Transmit Current: ≤ 3.0 A @ 25W
Standby Current: Mode 1 & 2: ≤ 2 mA (PTT or RF signal switched)
Mode 3: ≤ 200 mA (Continuous)
Load Mismatch Protection: 20:1 VSWR at all phase angles
Thermal Pr o t e c t io n : Thermal interlock disables at 80oC (175oF)
Duty Cycle: 100%
Operating Temperature: -30oC to +60oC (-40oC to +60oC Optional)
Operating Humidity: Up to 95% R.H. @ 25oC
Front Panel Indicators: RF Power
High VSWR
Overload
Over Temperature
Exciter VT-3A130, 2.5W output for 25W
Industry Canada Approval: TB A
FCC Approval: TBA
DANIELS
ELECTRONICS LTD.
TM
25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25 1-1
1.3 Physical Specifications
RF Connectors: Type N Standard
Corrosion Prevention: Anodized aluminum construction.
Stainless steel hardware.
Physical Dimensions: Width: Height:
14.2 cm (5.6") 13.1 cm (5.16") 19 cm (7.5")
Weight: 2.4 kg (5.5 lb)
Features: • Heavy Duty Aluminum Heatsink
• Thermal switched Fan (at +40˚C)
• Outputs of operating status signals:
-RF Power
- High VSWR
Depth:
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1-2 25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25
2 THEORY OF OPERATION
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25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25 2-1
2.3 RF Amplifier Circuitry
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ELECTRONICS LTD.
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2-2 25W AM Power Amplifier Instruction Manual IM71-AMP3A130-25
2.4 Printed Circuit board Numbering Convention
To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a
printed circuit board (PCB) numbering convention in which the las t two digits of the circuit board
number represent the circuit board version. For example:
• PCB number 43-912010 indicates circuit board version 1.0;
• PCB number 50002-02 indicates circuit board version 2 (no decimal versions)
All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.
DANIELS
ELECTRONICS LTD.
TM
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