4. Connecting to radio
Radio MINI DIN 6pin connector is placed on the rear panel of WX3in1. Pinout of
this connector is described in the following figure.
Connector pinout description:
1. RS-232/UART pin (currently not used),
2. APRS signal output from the device to the microphone input of radiotelephone.
This output also acts as a signal of PTT by shorting pin to ground through a
resistor 2k2 - an option for portable radios that do not have a separate PTT
output,
3. RS-232/UART pin (currently not used),
4. APRS signal input from radio to WX3in1,
5. Ground pin,
6. PTT output - if the external PTT output is selected in device configuration, this
pin is shorted to ground while broadcasting.
The level of input and output should be individualized in such a way that the
frames are decoded correctly. Recommended input signal amplitude is about
0.7V. Potentiometer inside of the device is provided for output signal level
adjustment.
6
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