I have a Pi3 that I am interfacing with a URI. In my experimenting, something happened and the URI now sends the courtesy tone every 3 seconds. When the cable/radio is hooked up, it constantly transmits (radio gets hot!). So, I disconnected the radio and rebooted the node (several times)... same thing.  It keeps sending the courtesy tone.

Anyone seen this or have a pointer for me? 

Thanks,

Doug

KI7DQG