D100  & GTX327 - No more Mode C?

[darinh]

I have a D100 connected to a GTX327 and have been flying this setup for 50 hours now. I went up the other day and the tower asked if I had Mode C...Affirmative was the reply to which he replied that he was getting a good transponder signal but no altitude. Like I stated, this setup has been flying for 50 hours and I have not touched a thing and this is the first time the tower has told me I wasn't encoding altitude.

Is there a way to check on the ground if the Tx is receiving the altitude from the Dynon? When they are both powered up, the Tx indicates PA so I would assume this tells me that the Dynon encoder is working as it should or is this a bad assumption? If this in fact the case, the issue should be in the Tx. Is my thinking here logical or not. Any ideas?

Thanks,

Darin

 

[dynonsupport]

Re: D100  & GTX327 - No more Mode C?

If you're seeing the pressure altitude readout on the transponder, then the altitude is getting to it from the Dynon. From there, you're probably looking at a transponder/antenna problem, but you'll need to get in touch with Garmin for that side of things. Is it possible you simply weren't in ALT mode?

 

[GigG]

Re: D100  & GTX327 - No more Mode C?

Did you try at the time to cycle from ALT to ON to ALT.