Mode C help.

[RicoB]

Originally Posted by BH1166

What does echo app show while on ground? If you can get a interrogation blip on transponder, check the EchoUAT app on your phone and see if you show squawk 1200, pressure and gps altitudes. Should see all three. EchoUAT gets its data for altitude and squawk after transponder receives and transmits it out by sniffing micro voltage on plane wiring of this transmitted data. If not seeing data, drop sensitivity on EchoUAT lower....lower means increased sensitivity. Good luck.

Hey Butch,
I have not checked the ECHO App. i will check it today. Dropping the sensitivity you mean getting into the hidden menu and lowering the threshold setting?

[FinnFlyer]

Originally Posted by RicoB

Is there any way to check if the dynon is sending the ALT info? specially when they report not getting my Mode C?

Rico, you already got your answer/suggestion by Walt in post#6 above.

Finn

[DennisRhodes]

You should be able to verify your pressure altitude on the 327 display while in Mode C . That may tell you about the ability of the 327 to receive the serial or grey code altitude from the D10. The next level would be to check on your phone echo app and see if the 327 is TRANSMITTING the altitude and that the ADSB data is being received by the echo. I would verify these before swapping out 327 . best of luck

[RicoB]

Originally Posted by DennisRhodes

You should be able to verify your pressure altitude on the 327 display while in Mode C . That may tell you about the ability of the 327 to receive the serial or grey code altitude from the D10. The next level would be to check on your phone echo app and see if the 327 is TRANSMITTING the altitude and that the ADSB data is being received by the echo. I would verify these before swapping out 327 . best of luck

Hello Dennis.
So yesterday when tower couldn't see my ALT the transponder was displaying the pressure alt, i was reporting my alt to the tower by it. than I rebooted, it showed the pressure alt right away on it's display but no joy for the tower, for a brief moment the was dashed lines on the transponder (10 sec or so) but it came back on my display but not on the tower. I will try to fly today and see if happens, if so i will open up the echo app to see if it is feeding to it.

[BillL]

Originally Posted by Walt

Does the xpdr display altitude data when the mode c is inop?
I assume it is losing that data from the dynon/wiring as I've never seen one display altitude but not transmit the data.

Walt, This will validate the transponder is getting the altitude, but not necessarily reporting with the ADSB output. The transponder I was referring to (GTX327) had an accurate readout of altitude on the display but not in the adsb report. Precisely, the adsb altitude report was periodically blank. As noted, it was a transponder issue due to triggering from the ADSB unit to meet the ADSB report cycle. It is a longer story, but that is the short version.

[GWZ]

Hi Rico, look at section 5.2.9 of the 327?s installation manual. There?s a page you can bring up that lets you view the serial data input to the 327.

[John Tierney]

Make sure the transponder is seating correctly/fully in the rack. I had a transponder problem in an older airplane, with similar "no mode C" issues, and bumping the face of the transponder with the palm of my hand resolved the issue. It just needed to be tightened down.

[skylor]

Also, be sure your transponder antenna isn?t dirty. I have heard of engine oil on the antenna causing issues with signal transmission.

Skylor