figure, amplified before it is fed to the second mixer stage for conversion
back to the original frequency.
The SAW filter combination is adjustable and can be software changed
from within OMT32 (or OMS) to cover various band widths.
The following power amplifier (PA) is controlled by the BSC control
circuitry. The amplifier gain will be reduced to avoid instability due to
poor antenna isolation.
A detector in the PA stage measures continuously the output level. The
signal from this detector is used by the automatic gain control, AGC, to
supervise and, if necessary, reduce the output power to keep it under a
maximum level. The AGC gain control affects several of the amplification
stages.
The output signal from the BSC board is taken from the P128 port and it
is fed to the HI port of a duplex filter (DPX). The output signal from the
ANT port of the duplex filter is fed to the repeater MS antenna.
RCC
The optional RCC Remote Communication Control unit, if used, is located
inside the repeater, see
on page 5-3.
Communication with the base station is performed by means of a built-in
mobile feature that has the antenna connected to the BS directional
coupler (DCC). Data is transferred between the repeater and the built-in
RCC unit via the P130 port.
The RCC unit is powered via the P130 port and the unit has a battery
with capacity to send a number of alarms if a mains power failure occurs.
R2R
The
Repeater to Repeater Link feature makes it possible to communicate
with a number of repeaters via one RCC unit in one of the repeaters in an
R2R net. Several RCC units can also be used in the same net.
The repeaters in the R2R net are connected to the P118 port and to the
P124 port.
The R2R feature is further described on
ALLGON Systems AB
ALR Compact Repeater
Functional Description
VD203 67/EN - User’s Manual
Rev. 1A 2000-07
5 - 6
