ADS-B Update

It must be time for some more ADS-B posts, either that or we can talk about PW5 :-)

With the ~$350 street price Trig TN72 GPS source now available in the USA I wanted to revisit my understanding of the situation with ADS-B Out in gliders. I wrote a forum post for local Northern California pilots but it probably helps lots of other folks in the USA. See https://www.williamssoaring.com/news...er-this-Winter

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And specifically I want to correct some doubt/misinformation I've helped spread here before about the Trig TN72 GPS source when it was first announced.. The TN72 is either (depending on how it is configured in the paired transponder) a:

1. TABS/TSO-C199 GPS source (with SIL=1)

*or*

2. A "meets performance requirement of TSO-C145c" GPS source (language I prefer, although Trig may say it differently) (with SIL=3)

(OK the TN72 can also do plain NMEA (with SIL=0), but that's not intersting here).

A little more details and the implications of this is described in post linked to above.

It would be great for folks doing 1090ES Out installs to share their experiences. Here, or contact me directly,

I am happy to try to answer questions.

I'm also planning to give a few talks on ADS-B (and FLARM and Transponders) over the next few months, certainly on the West Coast, details later.

Darryl