I agree, get an aviation interface that has an entertainment channel. The
more expensive panel mount audio panels may not have the frequency response
for stereo though. Most aviation panels are designed to pass the standard
communications 300-3300 Hz frequencies, and not hi-fi entertainment. Ask
before you buy though, as the entertainment channel may only be monaural,
not stereo as the entrainment source on a small plane is frequently the ADF
switched to the Am broadcast band.
Thanks Rick for mentioning RST...I just checked their website. I thought
they went out of business years ago due to a divorce or something. Nice to
see Jim is back in business again. He used to make aviation test equipment
and even a transceiver kit, that you sent back end after assembly for final
alignment and FCC/FAA sticker.
Doug K7ABX, formerly owned by Beech Musketeer N2392L
"Rick" wrote in message
link.net...
Steve wrote:

Is there a simple way to do this and prevent one unit from harming the
other??

Look at general aviation intercoms of the portable variety.
They are designed to mute the entertainment audio when a
communications radio becomes active. The price may be a bit
high but you may find a used one on Ebay and there are kit
options available from places like RST in Grass Valley CA.

Rick