RFL 9780 RFL Electronics Inc.
May 19, 2000 11-5 (973) 334-3100
11.4.1 INPUT ATTENUATOR ADJUST
Jumpers J2 and J3 are used to select the input attenuator depending upon the strength of the incoming
signal.
11.4.2 SIGNAL GAIN ADJUSTMENT
Potentiometer R13 is used for signal gain adjustment. This adjustment is used to normalize the received
level to the designed nominal level.
11.4.3 RECEIVE FREQUENCY SELECT
The center frequency of the bandpass filter must be configured for the module. Switches SW1 through
SW4 are used for this purpose. Each switch-bank changes a different part of the filter circuit and they
must all be configured correctly for proper operation.
The center frequency of the receive signal should be looked-up in Table 11-2, which lists the correct
settings for each of the ten switches in each of the four switch-banks (SW1 through SW4). A “0” in
Table 11-2 indicates that the switch should be “OFF”, while a “1” in the Table indicates that the switch
should be “ON”.
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