Hi.
I have a Terra AT3000 altitude encoder connected to a Garmin GTX 320
Transponder,
during initial flight tests I found that only mode A with no altitude
information
was being received .
Next time I remove the panel I will have to check that I have the wiring
correct.
Can anyone advise me of a simple way to ground test this setup off the aircraft.
I plan to produce a test lead with LED's on the data lines to see if the
encoder output code changes as pressure is reduced. Where can I find any info
about the grey code that the encoder sends to the transponder? I only require
codes for for a couple of spot checks between ground and say 10k feet.
This forum provided me with a wiring diagram for the encoder within minutes so
I am confident that someone will reply with a really simple way of getting these
devices to talk to each other.
I also have a vacuum DI that works fine on the test rig , passes every test BUT
preccesses like crazy in the aircraft but thats another story.
Regards
Tim Houlihan
G-BZTH No 10
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