 Re: xponder problems
Its either the encoder or the transponder itself. Go to a local avionics shop and have them test it on the ground with their computers. Best bet is to convince them to give you a loaner transponder to see if that fixes the problem. Most can be swapped out in less than 5 minutes. If it doesn't its probably the encoder (or antennas/connections). I call this guy that works out of a van. Usually if its working part time he will pull it apart and fix it. I would not pay more than $450 to get this fixed.
I have played with his handheld tester that gives an incredible amount of information. Something about the wavelengths being set properly could lead to a weak signal. If it is working part time you probably don't need to buy a new $1300 transponder.
This is all from my transponder problems with my plane, I don't really have a great grasp on any of it, just throwing out some ideas.
-Jason
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