On Tuesday, January 3, 2017 at 7:56:54 PM UTC-6, jfitch wrote:

What are the consequences of having a Trig 21 vs 22, in both the TABS regulations and pure functionality? I understand that a Trig 21 may not meet TABS regulations, if there ever comes to be some. But will it actually function, if wired to the Trig TN72 source?

I would think either would be fine. They are almost identical except in power output. There are actually no TABS regulations other than the TSO.

https://www.law.cornell.edu/cfr/text/14/91.227

goes on and on about UAT and TSO-166 specifications but doesn't mention TABS.

We will see when more information comes out of Trig. For instance - It would be really nice if the required antenna wasn't larger than the TN72 and more expensive.