Be sure to look at the Trig TT21 Mode S transponder - more like $2000 -
The TT21 is class 2.

* True, but you can get the Trig TT22 which is class 1.

And which, incidentally, seems to cost around $2400.

Which seems to be a smokin deal when compared to any other mode s
class 1 units... most of which seem closer to $5000. Add to that it is
lighter, easier to install and draws less power and it becomes a no-
brainer for a glider pilot wanting to *reasonably add this capability.

-Paul