VHF 30W POWER AMPLIFIER INSTRUCTION MANUAL AMP-3/150 Covers Models: AMP-3/140-30 136-174 MHZ AMP-3/160-30 Copyright © 2003 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 Electronic Ltd. registered in the U.S.
ii DOCUMENT CONTROL NOTE This document has been produced, verified and controlled in accordance with Daniels Electronics’ Quality Management System requirements. Please report any errors or problems to Daniels Electronics’ Customer Service Department. 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.
iii RF Exposure Warning Exposure to radio frequency (RF) energy has been identified as a potential environmental factor that must be considered before a radio transmitter can be authorized or licensed. The FCC has therefore developed maximum permissible exposure (MPE) limits for field strength and power density, listed in FCC 47 CFR § 1.1310.
v Contents General Information ............................................................... 1 Introduction ................................................................................................ 1 Performance Specifications ....................................................................... 2 Physical Specifications .............................................................................. 3 Theory of Operation ............................................................... 5 General .
1 GENERAL INFORMATION IN TR OD U C TION The MT-2/MT-3/MT-4 repeater system is a VHF/UHF radio system which is characterized by high performance and reliability under the most severe environmental conditions. The total system is designed to provide dependable, low maintenance performance, even in the most difficult circumstances. The MT-2/MT-3/MT-4 series of modules are packaged in the compact Eurostandard (5”h x 2.8”w x 7.
2 General Information P E R FO RMANCE SPECIF IC ATION S Type: MT-3 Series Power Amplifier Family: AMP-3/150 Models: AMP-3/140, AMP-3/160 Compatibility: MT-2, MT-3 and MT-4 Series Transmitter Exciters Frequency Range: 136 to 174 MHz Frequency Bands: 136 to 150MHz, 150 to 174MHz RF Input Power: 2 - 3.
General Information P H Y SICAL SPECIFICAT ION S Operating Temperature Range: -30ºC to +60ºC, optional -40ºC temperature test. Operating Humidity: Up to 95% RH (non-condensing) at +25ºC RF Connectors: Type N Standard Corrosion Prevention: Anodized aluminum construction. Stainless steel hardware. Physical Dimensions: Width: 14.2 cm (5.6”) Weight: 2.4 kg. (5.5 lb.) Features: •Heavy Duty Aluminum Heatsink; •Thermal switched Fan (at 40ºC). •RF Power, High VSWR, Overload and Overtemp Indicators.
9 ALIGNMENT & INSTALLATION R EC OM M EN D ED TEST EQU IPM EN T Daniels Subrack SR-39-1 with System Monitor Daniels Extender Card Kit EC-48RK Power Supply Regulated 13.8VDC @ 10A Current Meter 5.0A DC Voltmeter RF Coupler (eg. Bird 4275) Wattmeter (eg. Bird 4421) VSWR Meter (eg. Bird 4421) Dummy Loads 50 Ohm, 3:1 (50W) Spectrum Analyzer (eg.
10 Alignment & Installation A M P LI FIER BOARD A LI GN MENT Refer to the VHF 30W Power Amplifier Board Component Layout Diagram for the location of the adjustment capacitors, potentiometers, aircore coils and test points. This procedure assumes the use of a single subrack with an EC-48RK extender card kit for both the exciter and the power amplifier such that their internal adjustment points are easily accessible. Step 1: Remove the top extrusion cover from the transmitter exciter.
Alignment & Installation C ON TROL BOARD A LI GNMENT Refer to the VHF 30W Power Amplifier Control Board Component Layout Diagram for the location of the adjustment potentiometers and test points. This procedure assumes the use of 1/2 wavelength RF output cables between all pieces of test equipment after the PA output for accurate power readings during mismatched load conditions.
12 Alignment & Installation Note: The proper setting of this indicator cannot be guaranteed if a non-1/2 wavelength cable is used between the output of the PA and the antenna. - OVERLOAD - (VSWR Overload Alarm) is used to indicate that the load impedance mismatch is extremely high and could potentially damage the RF transistor. Under this condition, the gate voltage to the transistor is dropped thus reducing the RF output power and preventing damage to the MOSFET.
27 REVISION HISTORY Revision 1 1-1-0 Date Apr 2003 Oct 2003 ECO Description First Revision Complete update of manual and drawings.
