On Wednesday, May 15, 2019 at 7:49:31 PM UTC-4, Dan Marotta wrote:
For a Standard category glider it was a big pain to install and get the
documentation correct and approved.Â*

For me, the documentation was trivial. I made a logbook entry and got a PAPR https://adsbperformance.faa.gov/paprrequest.aspx (recommended but not required) The TT22 antenna got moved to a more optimal position further back in the fuselage, so I had got a fresh transponder compliance check (which was due anyways). My avionics tech looked over the installation that I did..


It was also very expensive

The TN72 including an interior mount antenna cost ~$400. I also bought a custom length antenna wire for the XPND for a few bucks. Craggy made the interconnect cable for me. I had a fun 5-6 hours doing the install. The transponder was installed by the previous owner.


WAAS GPS box is very large, nearly double the size of the XPND remote box.

The TN72 GPS box is smaller than the XPND remote box.Â*


Fortunately, there's plenty of room behind the Stemme's panel for the
hardware.Â*

No room left behind my panel, so I mounted a piece of plywood vertically behind my headrest on the turtle deck, and mounted the boxes to it. Provisions made to ensure air circulation. Space occupied is 2.5 inches front to back, 4" vertical, and full width of the turtle deck. Radio & vario speakers and a 'dashcam' are mounted to the same piece of plywood. I still have room on the turtledeck for a compression stuffsack of rain/cold/etc. gear, food, water for landouts.


I haven't had a "close encounter" since installing a
transponder about 7 years ago.Â*

As noted in my post above, one month after my install, I had one confirmed 'problem averted' with a GA airplane that could only 'see me' on their ADS-B-in screen. Better visibility to GA airplanes is the big win.