Specifications

10-2
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.