Olson Technology OTR-3550-SW - Manual (Page 4)

025-000232 REV C Page 4
3) DEMODULATOR AGC ADJUSTMENT
A) The demodulator delayed AGC adjustment is factory set for a +5 to +10dBmV threshold. This setting
provides the best signal-to-noise ratio for low level off-air signals.
B) For cable operation, where high-level adjacent channel signals may be present, adjacent channel
performance may be improved by lowering the AGC threshold level.
C) To adjust the delayed AGC threshold level for cable operation:
1. Connect a cable signal carrying three adjacent channels at a level of +20dBmV maximum to
the RF input connector.
2. Set the input channel select DIP switches to the channel located in the center carrier frequency
(of the three channels).
3. Adjust the demodulator delayed AGC control (R54) slightly for the least amount of adjacent
channel interference.