Another ham and I have been working on a mixer so that I could take the audio output of my XM and the 880 and then connect them to a FM transmitter in my car. The main goal is that the XM will always play but if there is audio from the 880 it will switch over. This should prevent me from having to tweak the volume knob on the car radio while driving.
http://www.k4fh.com/mixer.pdf Maybe someone else has created something similar or would like to try this design out. 73, Chris k4fh
