I have not enabled the ADS-B out, for all of the reasons listed in the
replies, however, having the ability to do it in the future, when it makes a
little more sense, was a significant factor in my selecting the TT21.

Also, I'm using the TT21 with a L2 dipole antenna mounted vertically on the
forward bulkhead of my glider (ahead of my feet. Seems to work really well.
The transmisson pattern has me flying in the center (very small hole) of a
really big donut.

John


"John Scott" wrote in message
.. .
I believe I started the thread storm about the TT21. After having a United
737 pass directly below me by about 300'-500' while thermaling, I decided
it was time to install a transponder. Since my plane is certified
Experimental-Amatuer built, I didn't believe I was constrained by the lack
of a TSO for the TT-21, so I ordered one, installed it, and had it
certified for operation.

I have been very happy. I've seen airliners routing around me on several
occasions since install it. With an CA302 & Tasman varios, Microair
Radio recieving, Oudie, and the TT21 replying to queries while sitting on
the ground, my current draw is about 600ma.

John Scott