User's Manual

- 11 -
When Pin 8 is connected to GND(0V), the radio is in program mode. The
parameters of the radio can be changed in this mode. When Pin 8 is connected
to 5V voltage, the radio works normally in transmission or receiving status.
Pin Function Type Range Description
Pin 1
Audio in(Data
TX)
Input 200VP-P ------
300VP-P
External Modulation Input
Pin 2 Audio out (Data
RX )
Output 150mV-250mV Demodulation Output
Pin 3 PTT Input
0
V/+5V
Transmit Enable
0V - Radio in Transmit status
5V - Radio in receive
status(Default )
Pin 4 GND GND 0V GND
Pin 5 B+ V+ 10-15V Power Supply(+12.5V typical )
Pin 6 SQ Output Open/Short RF Carrier Detect
Open -- low level,
Short -- high level (Default).
Pin 7
RSSI Output 0.8V-2.2V
Pin 8
Switch
Input
0V/5V
Programming Enable
0V - Radio programmable
5V - Radio work (Default )
Pin 9 Speaker Output 8ohm /0.5W