14-2
The DL-1000C is inserted in the receive audio path before the controller's audio switch. This audio switch
is controlled by the COR logic signal. Loss of COR will cause the audio switch to open, preventing the
receive audio from reaching the transmitter. The DL-1000C provides time for the switch to open before
the squelch crash noise reaches the switch's input.
During DTMF muting, 40 milliseconds of the first tone will sneak through before the DTMF decoder can
tell the microprocessor to open the audio switch. The DL-1000C provides the necessary delay to
overcome this problem.
Discriminator Switch
The DL-1000C can be used with discriminator audio. A FET switch Q1 is included on the board. If the
repeater’s COR logic is connected to the J1 header, the white noise hiss will be eliminated during key-up.
If the COR logic is active high set the J2 jumper between pins 1 and 2. If the COR is active low set the
J2 jumper between pins 2 and 3.
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