- Joined
- Mar 23, 2005
- Messages
- 13,226
UAT (978MHz) and Transponder (1030/1090 MHz) are different, but achieve the same requirements for ADS-B rules. Either can be your ADS-B OUT device, transmitting your GPS position. UAT transmits this position on 978MHz, and a transponder transmits this on 1090 MHz.
In the USA you must have a transponder as well as an ADS-B out device to be legal in 91.225 airspaces. This means either just a Mode-S with ES transponder, or a Mode-C or Mode-S transponder plus a UAT.
If all you care about is being legal for 91.225 airspace after 2020, then all you need is the above, which gives you ADS-B OUT.
If you want traffic and weather, you need ADS-B IN. This can be a 1090 receiver, which is traffic only. Or it can be a UAT, which can get both traffic and weather (FIS-B). Dynon's transponder cannot receive ADS-B traffic by itself. It can receive TIS-A traffic, which is only available in some Class C and Class B airspaces, but this service is being slowly phased out.
In the USA you must have a transponder as well as an ADS-B out device to be legal in 91.225 airspaces. This means either just a Mode-S with ES transponder, or a Mode-C or Mode-S transponder plus a UAT.
If all you care about is being legal for 91.225 airspace after 2020, then all you need is the above, which gives you ADS-B OUT.
If you want traffic and weather, you need ADS-B IN. This can be a 1090 receiver, which is traffic only. Or it can be a UAT, which can get both traffic and weather (FIS-B). Dynon's transponder cannot receive ADS-B traffic by itself. It can receive TIS-A traffic, which is only available in some Class C and Class B airspaces, but this service is being slowly phased out.