On Tuesday, December 22, 2020 at 11:56:51 AM UTC-7, Eric Greenwell wrote:
I suggest you keep your TT21, but install a TN72 with a TA50 antenna (total equipment cost of
about $460). You can't use it to enter A, B, and C airspace, though there are probably some
exceptions for glider operating areas (and maybe others), but you otherwise have all the
features the TT22 would give you. Here's the Trig document for gliders:

https://www.trig-avionics.com/librar...ust%202018.pdf


Thanks Eric. I think I will take this route. I received a few PM's from pilots using TT21's in this fashion. It makes a lot of sense for the case where you already have a TT21 and don't see a need to fly in full compliance airspace. I installed a PowerMouse with ADS-B in this year and it's helped me see just how busy the (unseen) traffic is in the Arizona airspace I mostly fly in. I'll start working on the firmware update my older unit almost certainly needs to get it working properly with a TN72.

JJ