ADS-B question

[marcusadolfsson]

Some good info from Garmin in this thread:

http://www.vansairforce.com/communit...58&postcount=2

As you probably know, G3X systems without certified position sources (like GNS/GTN units) are transmitting ADS-B Out today with their internal WAAS GPS and GTX23ES or GTX330ES Mode S transponders and enjoying the benefits of ADS-B, but the SDA parameter is set to 0 (indicating non-certified design assurance). Perhaps the regulations will change by 2020 allowing VFR aircraft to continue to use non-certified position sources for ADS-B Out like we do today, but we don't know.

To answer your earlier question about whether the ground stations can tell the difference between certified and non-certified position sources, yes, the ground stations see the SDA parameter in your squitter and know if you are 2020 compliant with an SDA of 2 or if you are non-compliant with something less.

Today, ground stations do not deny any services (including TIS-B uplinks of Mode C traffic and ADS-R rebroadcast of ADS-B traffic) just because your position source is non-certified.


Just a reminder that FIS-B weather is broadcast to everyone, so this also has nothing to do with the design assurance of your position source.

[bgillen]

Very helpful info. Thanks.

[davidmorris]

Has anyone bought one of these?
Has the factory looked at this?
http://adsb.skyguardtwx.com
I don't like the way it installs or the funky antennas but it's about the lowest price so far.
Maybe I should come out of retirement and design a $500 box that does everything.

Bill

I've had one in my Carbon Cub for a little over a month and like it.

David Morris
#275
N63PG