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Mark 12D Problem???
I have been struggling with a radio problem for some time now and am
having a tough time finding the real "root cause"! (I have a Narco - Mark 12D) It started several months back, when I would occaisionally get a "stuck mike". After several phases of trouble-shooting, it appeared to be a problem with the audio panel, which was replaced and seemed to solve the problem. A month or so ago, I lost contact with ATC while shooting some practice approaches... Apparently, they could hear me, but I couldn't hear them (confirmed by using my hand-held). Ever since then, I have been having strange issues with the radio, but it will occaisionally work fine for 20 minutes or so??? Symptoms: 1. No side-tone when transmitting??? 2. Occaisional loss of reception on known frequencies 3. No response (on known frequencies) to transmissions I took the radio into a Narco dealer and they confirmed a problem with the transmission switch (replaced a diode) and yellow-tagged the radio. I put the radio in the plane and it worked like a champ for about 30 minutes and started to exhibit the symptoms again??? I took it back to the dealer and the bench tested it for a couple of hours and said that it worked fine and everything was within specs! :-( I'm worried about throwing good money after bad and don't even know where to begin in resolving this issue. (I can't afford to throw a lot of money at new avionics and would like to get what I have working, if at all possible) Does anybody have any recommendations at troubleshooting this problem? My mechanic is at a loss as well. The loss of side-tone, while transmitting, seems to be an interesting issue... Any suggestions would be greatly appreciated! |
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