The problem is you spent $200 on an encoder 10 years ago and expect it
to work for a lifetime. You very rarely if ever see a bad mode C on an
airliner.

Roy Smith wrote:

wrote:

"unverified" Mode C.


When a Mode C readout is wrong, where is the problem? Is the encoder
producing bad data? Is the data path between the encoder and the
xponder corrupting the data? Is the xpdonder corrupting the data? Is
the RF pulse from the xponder being corrupted? Is the receiver not
decoding it right?