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Did change the serial port on my 430w. Double checked the configuration of the loaner 430w. Didn't check a resistor. I don't see one in my cockpit wiring diagram.

What type of GPS and transponder do you have? I replace both with loaners and it didn't do any good. The R-232 connection between the two was good. No one at Garmin or Trig could help. Tried every reconfiguration possible.

Jake, Thanks, but I've been working on this problem since Nov. and with people much smarter than me. It has baffled everyone. It makes no sense, None-the-less my ADSB died according to the FAA readouts in the middle of September. It's time for me to move on. I appreciate your offer, thanks...

Thanks again, your verification that the D180 update would have nothing to do with my ADSB out failure is exactly the info I was looking for. I am abandoning my current ADSB system and going with a SkyBeacon. Tom

JakeJ, thanks for your prompt reply. I have good continuity and activity between the 430w and the Trig. I have also replaced the 430w and Trig with loaners and got the same WARNING. Could you explain further about this resistor? Thanks, Tom

I replace my old fuel pressure sensor with a new Kalvico sensor. This required I update my D180, D100, AP74 firmware. About this same time, my Garmin 430w to Trig transponder ADSB-out failed only in the ADSB portion. I still have a good transponder and good GPS position according to my...

Updated all my Dynon equipment to firmware 5.6.1 for an RV-6. After reconfiguring, I recalibrated the AP74 servos, roll and pitch. Then tried to perform servo test. The test failed becuz the airspeed is not at zero. Can't find how to zero calibrate the airspeed on the D180. Any ideas? Thanks, Tom