User's Manual

The first mixer stage on the CHA amplifier board, which is controlled by
a synthesizer, converts the received frequency down to the IF frequency.
The signal is then filtered by a SAW bandpass filter and, not shown in the
figure, amplified before it is fed to the second mixer stage, controlled by
the same synthesizer as the previous one, for converting back to the
original frequency.
The output signal from the mixer is then amplified in the power amplifier
and fed to a combiner, which combines the signals from the two channels
on the channel board.
The output signal passes a combiner (CMB), a duplex filter (DPX), and a
directional coupler (DC), before it is fed to the repeater MS antenna.
ALLGON System AB AR Repeaters & OMT32 Hardware – Functional Description
User’s Manual VD202 90/EN Rev. 1A 1999-07 5 - 11