Bird-technologies 429-83H-01 Series-Datasheet User Manual download pdf

Tower Top Amplier System

429-83H-01-T, 429-83H-01-M

The new compact Tower-Top Amplifier (TTA) system is a high performance, quadrature-coupled low noise amplifier (LNA)

designed to increase the performance of a Base Transceiver Station (BTS) while ensuring reliable communications for critical

Public Safety applications. This increase in sensitivity can make up for the imbalance between mobile and handheld

users in critical systems.

The TTA system consists of two components: the Tower-Top Amplifier mounted close to the antenna and the Receiver

Multicoupler base unit. To reduce the size of the TTA and simultaneously provide 120 dB of isolation of a TX carrier, filtering has

been split between the TTA and the base unit.

Two independent LNA’s, each powered by separate bias circuits, provides component redundancy as well as excellent

intermodulation (IM) performance. Microprocessor-controlled fault detection circuitry provides continuous monitoring

and switching of each quad-LNA while sending operational data to the base unit for at-a-glance status reporting and

form C contact alarm switching.

For AISG/EIA-485 data communications between the TTA and base control unit, a custom PolyPhaserTM lightning protector

and a CAT-5E cable are installed at the transmission lines building entry-point ground plate. The surge protector not only

passes the DC current that powers the TTA but also generates the low frequency subcarrier for AISG/EIA-485. If the data

cable is damaged, removed or not installed, the TTA will continue to operate however, the status and alarm functions will

not be available at the base. For testing and diagnosing problems on the main receive line, a test transmission line is required.

The system will continue to operate if the test line is damaged or not installed however, an alarm will be continuously set.

FEATURES

Redundant quadrature LNA’s and automatic solid-state back-up switching

ensures reliable communications.

PolyPhaser

impulse suppressors provide protection from lightning damage

on all I/O ports.

AISG/EIA-485 compatible for data communications between TTA and Receiver

Multicoupler.

RF test port enables gain, sensitivity and desensitization measurements from

ground level.

Compact, weather-resistant stainless steel modified NEMA 4X enclosure.

Webpage user interface available for controlling and monitoring of amplier

currents, alarms and attenuators.

One rack-unit high Receiver Multicoupler (MCU).

Multifunction LCD readout with multicolored LEDs for status reporting.

Form C contacts for fault reporting through a supervisory system.

Ethernet connector for fast ATP mode switching and alarm details.

TX RX Systems Brand

TowerTop_42983H01T_2012 branding 9/17/2013 10:56 AM Page 1

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Tower Top Amplier System 1

Summary of Contents

Page 1 - Tower Top Amplier System

Tower Top Amplier System429-83H-01-T, 429-83H-01-MThe new compact Tower-Top Amplifier (TTA) system is a high performance, quadrature-coupled low nois

Page 2

Tower Top Amplier System429-83H-01-T, 429-83H-01-M30303 Aurora Rd. Solon, OH 44139 866.695.4569 www.bird-technologies.comSYSTEMS SPECIFICATIONS13 d

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Bird-technologies 429-83H-01 Series-Datasheet User Manual

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