Model AMP2440P
REMOTE BI-DIRECTIONAL POWER
AMPLIFIERS FOR 2.4 GHz
User and Installation Manual
Version 1.2 Sept 1999
\manuals\AMP2440P-FCC.doc
IMPORTANT SAFETY INFORMATION
Connecting the RF output of a radio modem transmitter to a high gain antenna will result in
concentrated signal level near the antenna. The field strength radiated by these antennas, when
connected to a transmitting Model 2400 Radio Modem with AMP2440P, may exceed FCC mandated
RF exposure limits. FCC rules require professional installation of theses antennas in such a way that
the general public will not be closer than the distances specified in Table (1) from the radiating aperture
of any of these antennas. End users of these systems must also be informed of this safety distance
requirement.
LIMITED WARRANTY
Young Design, Inc. (YDI) warrants that your device is free of defects in material and workmanship for a period of
one year after initial purchase. YDI will repair or replace any YDI product returned to the factory freight prepaid
within one year of the purchase date.
The YDI warranty covers repairs or replacement (at YDI’s option) of the product only. YDI is not responsible for the
cost of removal, reinstallation, or shipping to the place of repair. YDI does not extend or modify its warranty period
as a result of repair or replacement.
YDI reserves the right to void a warranty and/or bill reasonable charges for repair of a unit if the warranty seal is
broken or the unit displays evidence of misuse, abuse, or tampering.
YDI is not responsible for damage to any other equipment or property, or any other consequential or incidental
damages of any kind, whether based on contract, negligence, or strict liability. Maximum liability shall not in any
case exceed the purchase price of the unit.
Warranties give you (the buyer) specific legal rights. You may also have other rights which vary from state to state.
This warranty is only extended to purchases made in the United States of America or its possessions.
All Rights Reserved. No part or parts of this document may be reproduced, translated, stored
in any electronic retrieval system, or transmitted, in any form or by any means, electronic,
mechanical, photocopying, recording, or otherwise, without the prior written permission of the
WARRANTY NOTICE
The AMP2440P warranty is null and void if any of the following occurs:
1. The amplifier is opened.
2. The antenna connections are not properly waterproofed.
3. The amplifier is operated with no antenna attached to the antenna connector.
copyright holder.
TABLE OF CONTENTS
1. DESCRIPTION.............................................................................................................................................................1
2. AMPLIFIER FEATURES............................................................................................................................................. 1
3. SPECIFICATIONS .......................................................................................................................................................2
4. AMPLIFIER KIT ..........................................................................................................................................................3
5. INSTALLATION AND CABLING INSTRUCTIONS.................................................................................................4
6. AMPLIFIER CONNECTIONS AND INDICATORS..................................................................................................5
7. DC POWER INJECTOR CONNECTIONS AND INDICATORS ..............................................................................5
8. POWER SUPPLY .........................................................................................................................................................6
9. OPERATION ................................................................................................................................................................6
TABLE A - CONVERSIONS FROM DBM TO WATTS................................................................................................. 7
TABLE B - TYPICAL CABLE ATTENUATION VALUES............................................................................................7
TABLE C - AMP2440P TYPICAL INSTALLATION...................................................................................................... 8
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1. Description
The AMP2440P is a bi-directional amplifier designed for extending the range of 2.4 GHz wireless LAN cards.
The Model AMP2440P amplifier is intended only for use with the YDI Model WL2400-PCM and the
WL2400-ISA 2.4 GHz Direct Sequence Spread Spectrum Wireless LAN cards. The units provide transmit
power amplification as well as receive signal gain. The amplifier is installed right at the antenna’s feed
point, providing maximum effectiveness of transmit power. This has the effect of compensating for signal
loss in the transmitter cable to the antenna. Likewise, the Low Noise Amplifier (LNA) in the AMP2440P
boosts the receive signal right at the antenna prior to experiencing the loss in the transmission cable to the
radio. This gain also overcomes the losses in the transmission cable between the amplifier and the radio. In
fact, use of the amp will actually increase the receiver sensitivity by a few dB! The ultimate result is the best
possible noise figure and maximum receiver sensitivity.
The amplifier is completely weatherproof and can be bolted to the antenna mast or tower leg using the Ubolt included. The connectors face down so that gravity will drain all water away from the amplifier
enclosure. This will prevent water from settling on the face of the unit. Likewise, since the LEDs are also
facing downward they can be checked for operation from the bottom of the mast.
DC Power to the amplifier is supplied through the transmission cable, using an indoor power supply and DC
Injector. The amplifier unit also contains its own integral lightning protection and DC surge protection.
Likewise, the DC Power Injector connected to the WLAN card offers built-in lightening if properly grounded.
Full output power of 250 mW is achieved with only 20 mW (+10 dBm) input to the amplifier.
2. Amplifier Features
• Transmit input levels from 3mW to 100mW
• Up to 15dB transmitter power gain
• 18dB receive gain
• Low Noise Preamp
• Weatherproof Cast Aluminum Case that is Mast Mountable
• Mounting hardware that will accommodate mast diameters from 3/4” thru 3”
• Polyurethane gasket for watertight seal on amplifier
• DC Power carried up through the transmission cable
• Power and Transmit LEDs on both the amp and the DC power injector
• Built-in Lightening and DC Surge Protection
• Heavy Duty “N” Connectors
• One Year Warranty
• Made in the U.S.A.
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