I installed an Trig TT21 in my APIS (experimental amatuer built) glider
several months ago. It passed all Mode A, C, and S certification tests with
flying colors. The altitude encoder was spot on when tested. It tested at
300 watts output. It showed a 300 ma current draw when the test equipment
was interigating it at 235 interigations/second. It has worked well in the
air. It is light and easy to install. The wiring harness is easy to build.
Everything comes in the kit except the wire. I installed mine with an L2
dipole mounted vertically on the forward bulkhead of my glider (just forward
of the rudder pedals). The nose of my glider is all fiberglass.

John Scott