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My D10 EFIS has been working great for years, and I have now almost 600 hours on it. Today it started showing 400 kts and approx 10000 ft on the ground (which is close to sea level), and the indications did not change when airbone. I have disconnected the instrument and removed it from the...

Whoaa! I flew the test flight today from 4000ft (my home base) up to 10000ft in 500ft increments. Sometimes the readback from ATC corresponded with my altitude, sometimes it was 500ft off, sometimes it was WAY off. For example my altitude at 7000ft read back 10500ft! Coming back and crunching...

Ahhh Brantel, thanks again. I know I have good and common ground. I also always transmit too low altitude when the fault occurs. I figured that that must eliminate a shorting to ground for any of the pins, but if what you say is true, and that a 1 is really a grounded wire, this could also be...

Now we are talking! Thanks to Brantel and PhantomPholly for good input! I agree completely with Brantel concerning a loose/bad connection, that is why I have checked all the connections twice, tugged the wires while ohm-ing and cleaned the connectors and everything I could think of. Still, I...

David Thank you for your engagement, but unfortunately this is not helping me. I know how the transponders and encoders work. I fly from a controlled airfield, where of course I always set my QNH before takeoff. If you read my first post carefully, you will see I write "Recently ATC...

The altitude reported on the screen of the D10 is always correct, even when the transponder is reporting incorrect altitudes

I have 250 hours on my Dynon D10 with a Garmin transponder eating grey code from the Dynon. This has worked perfectly until now. Recently ATC complain that I am reporting too low altitudes (typically 800-1200ft too low), often after a while (the reporting altitude is correct  at takeoff and some...