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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3. Specifications
Rx
Tx
Tx Amp
Bandpass
Tx
RF
General Specifications
Operating Range:
Operating Mode:
Connectors:
Indicators:
Lightening Protection:
DC Surge Protection:
Transmitter Amplifier
Transmit Gain:
Frequency Response:
Transmit Output
Power:
2400-2483 MHz
Bi-directional, half-duplex. Senses RF
carrier from transmitter and automatically
switches from receive to transmit mode.
N-female
TX and RX LEDs on both the amplifier
and the DC power injector
Direct DC ground at antenna connector
on amp. Also, the DC Injector is also a
ligthtening protector if properly grounded
600 Watt TVS at the amplifier input from
transmission cable
Up to 15 dB
+/-1 dB over operating range
250 mW
Receiver Low Noise Amplifier (LNA)
Receive Gain:
Frequency
Response:
Noise Figure:
Third Order Intercept:
Mechanical and Environmental
Operating
Temperature:
Power:
Dimensions: Amplifier:
Mounting
Bracket for
amplifier:
18 dB typical
+/-1 dB over operating range
3.5 dB approximately
20 dBm
-20°C to +60°C
12VDC @ 650mA or 105-240 VAC
from power supply provided with kit
3.85” x 2.52” x 1.46”
DC Power injector:
4.42” x 2.40” x 1.22”
Accommodates pole/mast
diameters from 3/4” to 3”
Transmit Input Power:
3mW minimum,
100mW maximum
Model 2440 Amplifier Module Functional Block Diagram
Tx Power
Sense
To
Radio
12 V DC
DC
Power Supply
Rx Amp
Filter
To
Antenna
Rx
Kit Weight:
Amplifier shown with the mounting hardware and
Approx. 1.5 lb. with U-bolts
DC Power Injector
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IMPORTANT FCC REGULATORY AND SAFETY INFORMATION
The AMP2440P and the YDI WLAN 2400 WLAN cards must be professionally installed.
Table (1) shows the FCC approved antennas that can be used with and without the YDI
AMP2440P. When using the amplifier, only the outdoor antennas listed here can be used.
The amplifier cannot be used with the small indoor patch antenna (Model A24FP06). It is the
responsibility of the installer to ensure that when used in the United States that the
requirements in Section 15.247(b)3iii are meet.
TABLE (1)
Outdoor Antennas Certified for use with the WL2400 and AMP2440P
MODEL DESCRIPTION
A2408 8 dB gain Omni-directional Antenna 20cm
A2412 12 dB gain Omni-directional Antenna 20cm
Y2412 *
Y2414 *
A2.45 FP12 *
A2.45 FP18 *
A2.45 LP17 *
A2.45 LP15 *
PT2421 *
PT2424 *
12 dB gain Yagi Antenna 20cm
14 dB gain Yagi Antenna 22cm
12 dB gain flat Panel Antenna 20cm
18 dB gain flat Panel Antenna 35cm
17 dB gain long Panel Antenna 32cm
15 dB gain long Panel Antenna 25cm
21 dB gain Grid Dish Antenna 50cm
24 dB gain Grid Dish Antenna 70cm
Minimum Safe
Uncontrolled Exposure
Distance
* High-gain directional antennas which can only be used in a point-to-point link with the
amplifier due to ERP restrictions.
Important Safety Information:
Uncontrolled exposure distances is where the power density is 1mW/cm
such that there will be no person closer than the specified distances in front of directional antennas or
directly beside the Omni antennas.
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The antennas must be installed
4. Amplifier Kit
Each Amplifier Kit Includes:
• Bi-directional Amplifier
• DC Power Injector
• 110/220 VAC Power Supply with 12VDC output
• Stainless Steel U-Bolt and mounting bracket for amp
• Installation Manual
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5. Installation and Cabling Instructions
The amplifier can be mast mounted using the steel U-bolt included with
the unit (Refer to the drawing at the end of the manual for a cabling
diagram). The amplifier should be installed with the connectors facing
downward. Use an open-end wrench to carefully tighten the bolts using
the included nuts. Take care not to over-tighten the bolts.
The amplifier can be mounted to a flat surface using any of the mounting
holes on the brackets mounting flanges. However, for maximum
reliability, the connectors should be facing downward.
It is very important to waterproof the RF connectors on the amp. However, it is recommended that you do
not tape the connectors until after all system tests have been performed. Be sure to use a high quality
weather resistant electrical tape and/or other water sealant method.
The DC Power Injector is not in a waterproof enclosure and must be protected from the weather. It can be
permanently mounted to a surface by putting screws through the two holes on the bottom of the enclosures.
To do this, remove the four screws holding the top cover on the enclosure. Then mount the bottom of the
enclosure using screws or bolts through the two holes in bottom. Replace the top cover when the enclosure
is securely mounted. Avoid touching the circuit board mounted to the cover of the DC injector when the
cover is off.
Refer to the Typical Installation Details drawing at the end of this manual for more information about the
installation.
Amplifier in typical installation.
Shown with the YDI Model Y2414 Yagi Antenna.
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6. Amplifier Connections and Indicators
Transmit LED: This LED glows RED in transmit mode indicating that RF power is applied to
the amplifier from the radio.
Receive LED: This LED glows GREEN in the receive mode when DC power is applied to the
amplifier and is off when transmitting.
DC Injector Connection:
This “N” Female connector is connected to the DC Power Injector via the
transmission cable.
Antenna Connection:
This “N” Female connector connects to the antenna with a short length of coax
cable.
7. DC Power Injector Connections and Indicators
A DC Power Injector is an in-line device which “injects” the DC power necessary to operate the amplifier
onto a transmission line. This allows the cable to carry both RF signals and DC power to the mast mounted
amplifier.
Transmit LED:
Receive LED:
To Radio Connection:
This LED glows RED when the pole mounted amplifier goes into the
transmit mode. The Remote Transmit LED is driven by unique circuitry,
which actually detects changes in the DC current traveling through the
transmission line to the amplifier.
This LED glows GREEN when DC power is applied to the amplifier and it is
in the receive mode. When toggling between transmit and receive this LED
will glow slightly dimmer.
This “N” Female connector is connected to the radio modem via a short
jumper cable.
To Amplifier Connection:
12 VDC:
This “N” Female connector connects to the amplifier on the mast via the
transmission line.
This is the DC power input for the injector and is a standard 2.1 mm barrel
jack. +12VDC should be applied with center positive.
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8. Power Supply
The AMP2440P comes with a power supply that have standard 2.1 mm barrel plugs (which are configured
as positive (+) tip and negative ( - ) outer conductor). Although normally supplied with a power supply, any
regulated 12 Volt DC 1 amp supply can be used. The power supply provided with the kit can be used with
110 or 240 VAC power.
9. Operation
The unit operates automatically and there are no user adjustments.
These modems “ping-pong” back and forth between transmit and receive so quickly during normal operation
that both the TX and RX LEDs will appear to be lit simultaneously. In fact, they are turning on and off so
quickly that they appear to be on all the time. You can tell how quickly one of these LEDs are turning on and
off by their brightness. Their glow will be slightly dimmer when they are off.
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Table A - Conversions from dBm to Watts
dBm Watts dBm Watts
0 1.0 mW 26 398 mW
1 1.3 mW 27 500 mW
2 1.6 mW 28 630 mW
3 2.0 mW 29 800 mW
4 2.5 mW 30 1.0 W
5 3.2 mW 31 1.3 W
6 4.0 mW 32 1.6 W
7 5.0 mW 33 2.0 W
8 6 mW 34 2.5 W
9 8 mW 35 3.0 W
10 10 mW 36 4.0 W
11 13 mW 37 5.0 W
12 16 mW 38 6.0 W
13 20 mW 39 8.0 W
14 25 mW 40 10 W
15 32 mW 41 13 W
16 40 mW 42 16 W
17 50 mW 43 20 W
18 63 mW 44 25 W
19 79 mW 45 32 W
20 100 mW 46 44 W
21 126 mW 47 58W
22 158 mW 48 64 W
23 200 mW 49 64 W
24 250 mW 50 100 W
25 316 mW
Table B - Typical Cable Attenuation Values
Cable Type Attenuation per 100 ft (dB)
at 2.4 GHz
Belden 9913 8.0
LMR 200 16.8
LMR 240 12.9
LMR 400 6.8
LMR 600 4.4
1/2 “LDF 3.9
1/2” Superflex 6.1
3/8” LDF 5.9
3/8” Superflex 6.8
1/4” Superflex 9.8
These values are approximate. Check with cable manufacturers for exact specifications.
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Table C - AMP2440P Typical Installation
TYPICAL INSTALLATION DETAILS
If the customer does the installation, YDI will provide:
DC POWER
INJECTOR
Model 2400
Radio Modem
PC, Router,
PLC, etc.
RS232 cable
Short length of RG58/U
(CAB-RPNM-12“)
RF + DC
Choke
110/220 VAC
DC P.S.
N-male
N-male
RP-TNC male
ANTENNA
Omni-directional (shown), or
Grid Dish Yagi Antennas (not shown)
AMP2440
(mounted to mast with U-Bolt)
N-male connector
Transmission Line
Mast
Drip
Loop
Drawings\diagrams\inst2440.cdr
LMR-400, Belden 9913 or other low loss cable to radio room
The radio installer should provide:
Antenna, pole mounted amp, DC injector, DC power supply and
the Model 2400 radio modem, if ordered.
Mast, cable from antenna to amp, transmission line from the amp to the
DC injector, short cable from the DC injector to the radio modem and
the RS232 cable. However, YDI can also provide any of the cables,
if desired.
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