Am building an APRS Digipeater/Tracker for mobile use. Have an EasyDigi with the USB-to-Serial for the PTT. Have tried to use this but as soon as I have configured the serial port the transceiver goes into transmit, also inverting the signal didn't help.
Is there a way to get the PTT working with the USB-serial or should I just forget about that and use GPIO25 and bring that and a ground to the EasyDigi?
John
