Pete, you didn't mention your radio interface - it looks like it might
be a DigiRig?
Ideally you would have selected that on the Initialize page.
Also, do me a favor please, hook everything up, power on DigiPi with radio
connected, wait for it to boot (1.5mins) then turn "on" [APRS Digipeater].
Wait exactly 8 seconds, and watch for Transmit.
also post the contents of "PktLog" here to help as well.
thanks,
-craig
KM6LYW