User Manual

ALLGON SYSTEM AB - Proprietary
Technical Specification for PCS Tower Top Power Amplifier [Allgon 9256]
Preliminary
-
Subjected
to change without notice
Rev.pA0
File: 93651
Page 6 (19) 29 Mar 00
3 SYSTEM OVERVIEW
3.1 G
ENERAL
The PCS Tower Top Power Amplifier (TTPA) is intended for use at sites where it is necessary to improve
the coverage area. The TTPA boosts both the receive-path signal and the transmit power from one TRx in
order to preserve site link balance. TX and RX signal paths are separated by means of duplexers. The TX
Power Amplifier (PA), as well as the RX Low Noise Amplifier (LNA), utilizes balanced architectures to add
redundancy.
The TTPA can also be used together with a micro or mini BTS to reach coverage equivalent with a far
more expensive Macro BTS installation.
The TTPA has a small and lightweight design, which enables it to be mounted in the antenna tower, near
the antenna. This means that less costly feeders can be used since the attenuation becomes of less
concern when the PA and the LNA is situated near the antenna. DC power to the TTPA is supplied , via the
antenna feeder. The TTPA incorporates an advanced self-supervision system that automatically switches
the unit into bypass mode in the event of malfunction or power failure.
RX
RX/TX RX/TX
MHB
MHB
BTS
TTA
RX/TX
RX
RX
RX/TX
Figure 1. Typical site configuration with Tower Top Amplifiers.
KEY PARAMETERS
TX Gain: 7 dB
TX Power: +43 dBm (20W)
RX Gain: 13dB