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The FAA web site has a list of obsolete radios, but I can't find it right now.

Its on the FCC web site. Also in the AOPA web site somewhere.

http://wireless.fcc.gov/aviation/badlst.html

The best thing you can do if you encounter one of these radios is plan on removing it, as it is simply dead weight, ready for the scrap heap.

Charles

Visit my Early Cessna150 website

http://150cessna.tripod.com