On Tuesday, February 14, 2017 at 7:30:57 PM UTC-8, Paul Villinski wrote:

Debating whether to add the new Trig TN72 GPS unit and TA70 antenna to the Trig TT22 transponder in my Experimental glider, for a legal TSO-C199 "TABS" ADS-B system.



If you already have a Trig 22 in your experimental glider, you can legally connect one of the existing GPSs you probably already have in your panel to your Trig, and start sending adsb-out as a NPE aircraft. This is explained in the FAA document

https://www.faa.gov/nextgen/programs...3-15-webV2.pdf

As explained in the FAA document, ATC may choose to not send your adsb-reported position to other aircraft. But they will receive your transmission, so presumably could use it for search-and-rescue purposes.

If you do this, you need to use the Trig setup menu to select 'uncertified gps' as the adsb source. See the Trig manual.