On Friday, April 3, 2015 at 1:53:32 PM UTC-7, wrote:
I would expect that the PowerFlarm NMEA to Trig for ADSB Out will be a popular configuration for anyone with an experimental glider.

Other than making up a cable to go from the PowerFlarm to the remote unit on the Trig is there any testing requirement similar to the Biannual Transponder check that would be required?

You are in the wild wild west. You are not meeting any requirement and so not required to do any additional tests that I am aware of besides maintaining the transponder biannual tests. But you better be damn sure to set the GPS SIL parameter and other information correctly... check with Trig and/or their dealers and/or your avionics shop to make sure you have the latest instructions on setting this up.

It will be interesting to see how long a range people see in practice between their Trig transponders with 1090ES Out and PowerFLARM 1090ES In. And 1090ES Out in gliders *might* get interesting for club/FBO/crew tracking.

The dual-link coverage mess with TIS-B and ADS-R is well a mess. If you have an ADS-B receiver capable of receiving TIS-B or ADS-R (like a Garmin ADS-B portable receiver) then you also need to set the appropriate ADS-B out capability code bits in the Trig. It really does not matter with a PowerFLARM since they can't receive ADS-R or TIS-B. I suspect the FAA would really prefer that not set unless you can really have that receive capability--but I'm not sure how seriously they would care. And at some time the threat seems to be non-compliant ADS-B Out won't trigger ADS-R and TIS-B services anyhow.