Does anyone have experience or information on the TT 26? I see them as used on e-Bay for $1000. Seems too good to be true for a unit with the GPS built in. I am interested in controlling it from a Grand Rapids Sport EX. Add a $140 GPS antenna, transponder antenna and a little wiring for a cheap ADS-B solution.
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I think the TT26 is certified for UAV use, not manned aircraft. So you can’t use it to comply with ADS-B mandates.
Yes, it also is for UAV, but it is also good for at least experimentals. Just curious about issues of failure and whether the Grand Rapids EFIS will control it. I am pretty confident it will, but it would be good to talk to someone who has done it. The TT23 is the new model like this, but is around $3000.
Hi,
Did you get this to work, GRT+TT26?
I have troubles with my TT21 transmitting power and find those TT26 available but really few TT21/TT22 for sale..
/David
I haven’t gotten a transponder yet, but contacted GRT and they said the 26 doesn’t work with my sport ex.
Ron Voss
Ok. Thank you 
I have a feeling that it would work but they have most likely not to much interest in investigating. Both units have TMAP protocol for communicating.
If I find a TT26 somewhere I will test and come back with results 
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