Teletronics International Smartamp Manuel d'utilisation
SMARTAMP TM
BI-DIRECTIONAL POWER
AMPLIFIER 2.4 GHz version
User and Installation Manual
TELETRONICS INTERNATIONAL, INC.
1803 Research Blvd., Suite 404,
Rockville, Maryland, USA, 20850-3155
Tel: (301)-309-8500 Fax: (301)-309-8851
SmartAmp TM is a trademark of Teletronics International Inc.
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Copyright ©1999
by
Teletronics International, Inc.
Patent Pending
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 copyright holder.
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Table of contents
1. General Product Description____________________________________________ 3
2. Background _________________________________________________________ 3
3. Major Parameters ____________________________________________________ 4
4. Salient Characteristics:________________________________________________ 4
5. Installation:_________________________________________________________ 6
6. DC Power Injector Connections, Indicators and labels: ______________________ 7
7. Amplifier Connections, Indicators and Labels: _____________________________ 7
8. Functioning: ________________________________________________________ 8
9. Specifications: _______________________________________________________ 8
General Specifications ________________________________________________________8
Transmit Power Gain_________________________________________________________9
Nominal Loss Characteristics For Different Cables ________________________________9
10. LIMITED WARRANTY _____________________________________________ 10
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1. General Product Description
SMART Amplifier (SMARTAMP) is a new bi-directional antenna-mount amplifier designed to
match any advanced spread spectrum system, either direct sequence or frequency hopping,
to allow the extension of the operating range in wireless environment. It is provided in a wide
range of frequencies, such as 900 MHz, 2400 MHz, or 5800 MHz where advanced spread
spectrum systems are operated. It works in Time-Division Duplex (TDD) mode that allows
the radio device sharing the antenna in different time intervals. SMARTAMP consists of an
intelligent algorithm and Automatic Gain Controlled (AGC) circuits to maintain the output
power and prevent transmit signal saturation. The input transmit power level is sensed by the
Radio Frequency (RF) sensor and the gain is automatically adjusted to minimize the signal
distortion so that the desired signal quality can be assured.
This product has a wide range of wireless applications in Wireless Local Area Network
(WLAN), Wireless Local Loop (WLL), Wireless Internet Access (WIA), wireless modem
connection with point-to-point, point-to-multipoint, where the Time Division Duplex (TDD)
technology is used.
2. Background
In wireless applications, when longer operating range is required, the add-on antenna
amplifier and DC injector set are often a choice. Because of different site layout and
hardware configuration, it is almost impossible for amplifier manufacture to design the
amplifier and fit all applications. Typically, in most applications, the interconnection cable
could have different length from a few feet to a few hundred feet. The attenuation between
DC injector and bi-directional amplifier could be few dB to more than 20 dB. Also, different
radio modems have different output powers. Thus, the system installer must carefully
measure the input RF power at the antenna amplifier and specify the gain of the amplifier in
order to maintain the system performance. With different systems, different amplifiers are
required. With this invention, the major difference as compared to other existing technology,
is the “SMART function” - power level detection and automatic gain control circuit. With
SmartAmp, the gain can be intelligently adapt to the input power level in a wide range and
automatically further adjusted to accommodate the cable and connectors loss, by however
length and configuration. The output power level is monitored and maintained intelligently,
hence the desired performance can be achieved in all hardware configurations for TDD
wireless applications irrespective of installation environment.
The table below summarizes the difference between SMARTAMP and other TDD antenna-
mount amplifier product.
Differences Between SmartAmp and Other TDD Amplifier
SMARTAMP Other TDD Amplifier
Transmit gain Intelligent self adjusted Fixed
Transmit power level Maintained Varies, depending on input power
level
Transmit signal distortion Minimized at all time Much worse at high input power
levels
Input power range
requirements Wide range accepted Designed for narrow range only
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3. Major Parameters
Smart Amplifier fitted with a Low Noise amplifier (LNA) and together with its unique bi-
directional features is fully capable of enhancing the coverage area of 2.4 GHz radio signals
by amplifying transmitted and received signals.
The Smart Amp ensures a seamless RF link in most installations with long cable losses. Its
unique outdoor design enables it to be mast mounted and to operate in wide temperature
range of –20 to 70 C.
Only 2.0 mW (+3 dBm) input to the amplifier is enough to deliver 500mW. For signal input
values greater than 4 dBm the Smart Amplifier attenuates the signal accordingly and
keeps the output at 27 dBm. Up to 200 mW of power may be safely applied directly to the
amplifier input without causing any damage.
The complete set includes:
1. An outdoor unit, the SmartAmp
2. DC injector
3. Universal power supply
4. Mounting hardware.
The DC injector carries the power along with RF signal to the outdoor unit via
co-axial cable.
4. Salient Characteristics:
•Complete One Year Warranty on parts and labor.
•Automatic gain control to minimize the signal distortion
•Wide Transmit input levels (1mW to 200mW)
•Low noise amplifier with system noise figure 3.5dB
•Universal 110/220VAC auto switching AC adapter for DC power injector
•Green LED on DC Injector for power.
•Bi-color LED on SmartAmp for transmit and receive.
•SmartAmp equipped with Lightening Protection if grounded properly.
•DC injector equipped with surge protection.
•Industry standard “N” Connectors on both ends.
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•Outdoor Weatherproof enclosure.
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5. Installation:
The SmartAmp is a stand-alone unit designed for installation by professional radio installers.
Typical Installation:
As shown in the above diagram power is carried to the amplifier from DC Injector via RF
cable. The DC injector is an indoor unit and requires weather protection. The amplifier is
installed at the antenna pole (or mast) with the U-bolt assembly. It is a weatherproof unit and
designed to withstand the outdoor environment. Since the SmartAmp is built with lightening
protection circuitry, it is extremely important to ground the whole unit. A grounding cable can
be tightened directly to the U bolt. This would not only ground any lightening strike on the
antenna but would also relieve it from any static buildup in the environment during bad
weather.
Once the unit is installed and tested, all the N connectors must be waterproofed with electric
tape or any other sealant.
Caution:
I. The RF cable between the DC Injector and the amplifier carries 12V DC
power, make sure it is NOT shorted to ground, OR DC Injector could be
permanently damaged.
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II. If this cable is accidentally connected to “To Antenna” connector on the
Amplifier (since it has lightening protection with DC ground), the DC
Injector could be permanently damaged.
6. DC Power Injector Connections, Indicators and labels:
The DC injector injects DC power into the RF cable and the power is carried to the amplifier
with the RF signal.
“To Radio” Connection:
This “N” Female connector is connected to the radio modem via a short jumper RF cable.
“To Amplifier” Connection:
This “N” Female connector connects to the amplifier on the mast via the transmission
cable.
LED: Green LED indicates DC power on.
DC Power Supply:
The power supply provided with the unit is universal type, 110/220 V AC to 12 VDC converter. This has
been tested for quality and performance. If a different 12V DC adapter has to be used make sure it is
provided with center positive 2.5mm jack.
7. Amplifier Connections, Indicators and Labels:
“TO DC Injector” Connection:
This “N” Female connector is connected to the DC Power Injector via the transmission
cable.
“TO Antenna” Connection:
This “N” Female connector connects to the antenna with a short length of coax cable.
LED:
This LED indicates three states:
1. Transmit = Green
2. Receive = Red
3. High speed Tx / Rx switching = Orange
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8. Functioning:
The unit operates automatically and no user adjustments are required.
This amplifier is designed for 2.4 GHz radios using Time Division Duplex (TDD) mode of
operation. It is equipped with a high speed Tx / Rx switch, that detects transmit signal and
switches to transmit mode within 600 ns. In the absence of any transmit signal the unit stays in
receive mode. If used with a radio devices using separate bands for transmit and receive in a
true full duplex mode, the amplifier would not work.
9. Summary:
This manual describes how SmartAmp as a product exploits the automatic gain control by detecting
the input power level, automatically adjusting its gain and maintaining the output power to a specified level
while minimizing the signal distortion and maximizing and transmission distance. This product has a wide
range of wireless applications in Wireless Local Area Network (WLAN), Wireless Local Loop (WLL),
Wireless Internet Access (WIA), wireless modem connection with point-to-point, point-to-multipoint, where
the Time Division Duplex (TDD) technology is used.
Should you have any problems using it, call our service department at 301-309-8500.
9. Specifications:
General Specifications
Operating Range 2400 ~ 2500 MHz
Operating Mode Bi-directional TDD
Transmit Output Power +27 dBm (500mW)
Transmit Input Power 0 dB min, 23 dB max
Transmit Gain Automatically adjusts up to 26dB
Receive Gain 14 dB
Frequency Flatness ±1.0 dB
Noise Figure 3.5 dB
Lightening Protection Direct DC ground at antenna port
DC Surge Protection At 12 V DC input
LED indicators on Amp Tx: Green, Rx: Red
Operating Temperature -20 °C ~ + 70 °C
Power Supply 12 V DC at 0.7 amp
RF Connector Type N, Female
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Transmit Power Gain @ 2.45 GHz at 25 °°C
INPUT LEVEL
(at amplifier) TYPICAL
OUTPUT LEVEL
1 mW (0 dBm) 420 mW
1.3 mW (1 dBm) 450 mW
1.6mW (2 dBm) 470 mW
2mW (3 dBm) 500 mW
2.5 mW (4 dBm) 500 mW
50 mW (17 dBm) 500 mW
100mW (20 dBm) 500 mW
200mW (23 dBm) 500 mW
Above 2 mW input, the smart amp attenuates the input signal power and maintains the output
power typically at 500 mW.
CAUTION: Do not exceed 200mW (+23 dBm) of input power to the amplifier.
Nominal Loss Characteristics For Different Cables
(decibels per hundred feet at 2.5 GHz)
LMR-400
LMR-500
LMR-600
LMR-900
LMR-1200
6.8 dB
5.5 dB
4.4 dB
3.0 dB
2.27 dB
Rx Amplifier
Tx Amplifier
Bandpass
Filter
Tx Power
Reader Tx Power
Sensor
Tx
Rx DC
Power
Supply
Functional Block Diagram
Variable
Attenuator
In
Antenna
Tx
Rx
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