[Piper J3]

I got a note from uAvonix that they will be launching the EchoUAT 2020 compliant ADS-B at the Sun n Fun Airshow, the first week of April. The retail price will be $999 for the base EchoUAT w/o GPS. They will also be releasing the SkyFYX GPS approved source in the coming weeks for $500 or less. So if you have a approved GPS source in your plane, the cost would only be $999, otherwise about $1499. The EchoUAT is for Experimental and Light Sport aircraft. This might be a good alternative for earlier RV-12 with the Dynon D-180 and Garmin GTX-327 Transponder.

See http://www.uavionix.com/products/echo-uat/