On Thursday, September 21, 2017 at 6:34:01 PM UTC-4, wrote:
Clarification...

Trig TN72 with Trig TT22 WILL be seen as having a non-zero quality indicator. (good)

Trig TN72 with Brand X Mode S/ADSB out, almost certainly has a zero quality indicator (not good).



On Thursday, September 21, 2017 at 4:34:34 PM UTC-5, WaltWX wrote:
You make a very good observation...

So, what's the point of using a TABS TN72 with a Trig system if no one can see it?

Daryl... do you have any insights on this?

This has been discussed here many times over. The GPS source alone is not approved. It is the combination of the GPS and the mode S transponder that is approved. Please read up on the FAA website first about approved combinations, then search through this forum for additional information.