Bird Technologies 429-83H-01 Series-Datasheet - Manual

Tower Top Amplifier 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 TM 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 amplifier
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
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