开云体育

Is there no way to take the RTS pin on the 9 pin connector and run it into a transistor at the base and use it to switch the PTT line at 0vdc.

This way you can still use the RX, TX and gnd pins for CAT control and use RTS high (12v I believe) as breakout. You don’t need any voltage on the collector and the emitter to a common ground with the base and appropriate resistor to the RTS. The PTT can sit in collector and be grounded via the resistor. Most software should allow the RTS keying but I will be honest I’ve not been following this thread that closely.

Please correct me if this won’t work for you?

De Spence G5STO

Ps: I use this method to ground my relays via 0vdc line into an optoisolator. The optoisolator is powered and the transistor brings the internal IR led to ground to switch on.


Sent while portable! please excuse typos.