User's Manual

must be soldered in the C352 location. The DC voltage should be 2.5 volts nominal and very well
regulated. Note: The FCC Type Acceptance obtained by RITRON is invalid once this modification is
made. The user is responsible for obtaining type acceptance in a configuration which includes the
device which is connected to the AUX IN input.
9.2 RF BOARD OPTIONS
9.2.1 DISCRIMINATOR POLARITY
The polarity of the discriminator output at pin 13 of J102 is configured at the factory such that an increase
in RF frequency causes an increase in DC voltage. This is considered “normal” mode. An inverted mode
is available where an increase in frequency causes a decrease in voltage. On the DTX-160/260 models, this
is effected by removing R130 and placing it in the open pad pair denoted as R125. On the DTX-360/460
models, this is effected by removing R125 and placing it in the open pad pair denoted as R130.