ADSB visibility with non certified GPS

My mistake- the 175 watt units are good to 15,000 MSL, 200+ watts necessary above that. So, Moriarty and most high altitude western US sites with potential flight altitudes to 17,999 MSL (and higher in ARTCC authorized airspace such as wave windows or SAGE II clearance in the Sierra Nevada Wave etc.) would imply utilization of the higher transmit power of the TT22 over the TT21.

On Saturday, September 23, 2017 at 6:20:38 PM UTC-7, wrote:
My mistake- the 175 watt units are good to 15,000 MSL, 200+ watts necessary above that. So, Moriarty and most high altitude western US sites with potential flight altitudes to 17,999 MSL (and higher in ARTCC authorized airspace such as wave windows or SAGE II clearance in the Sierra Nevada Wave etc.) would imply utilization of the higher transmit power of the TT22 over the TT21.

Yes but nobody really cares about this, and lots of lower power transponders have been flying in gliders for years and provide good visibility to ATC and TCAS etc.

The pressing reason to use a TT22 over a TT21 is for ADS-B Out compliance, especially in a certified glider the TT21 cannot be installed or used for ADS-B Out for any purpose.You will not get installation approval for it, and I don't want folks having tears when they discover that.

The important things are focusing in safety and installing and using a transponder at all if you are near busy airspace. Please install and use whatever transponder you have/can get/afford. For ADS-B future use reasons it is a good idea to install a TT-22.

If I read the Trig website correctly the tt21 is approved for adsb-out just about everywhere on the planet except the USA. So if someone brings their certified glider from their home country are they legal to fly in the USA or must they comply with USA requirements?

On Saturday, September 23, 2017 at 7:33:27 PM UTC-7, Dave White wrote:
If I read the Trig website correctly the tt21 is approved for adsb-out just about everywhere on the planet except the USA. So if someone brings their certified glider from their home country are they legal to fly in the USA or must they comply with USA requirements?

Is there light at the end of this rat hole? But the answer is going to be comply with US regulations. The more detailed answer of course is you are going to discuss this with an FAA representative.

And there is no such thing as just a TT-21 install for ADS-B out.What is the GPS source? I expect many gliders flying outside the USA who have ADS-B Out have a COTS GPS source, and that likely a worse issue, who knows what they set SIL etc. to. Not only will that not be valid in a certified equivalent aircraft in the USA but it may well get you noticed by the feds.