GNS430W instead of GPS-2020

[pbesing]

I noticed there is an INPUT from a GPS for ADSB compliance. If I have a 430W, am I to understand that it can output what I need, thus negating the GPS-2020 antenna? Would I be in full compliance with the GNS430W and the 261 transponder ?

Thanks

Paul Besing

 

[jakej]

Simply, yes 
You connect 1 430W serial port directly to the Dynon Transponder (with 1.21koHm resistor in series) & allocate the port as Garmin ADSB +.  Make sure you have the suitable Garmin software installed.

Jake J
Glasair IIS- FT 1994

 

[pbesing]

Thanks...I saw that. I also noticed that SV requires a faster update on their GPS to keep the screens from being jerky. I'm trying to avoid having two GPS antennas. Can the GPS 2020 antenna also supply my Garmin 430?

 

[Dynon]

No, it can't. Pesky certification rules

You can have the 430's GPS be your transponder's position source while still allowing an SV-GPS-2020 or SV-GPS-250 to be your position source for SkyView's map and synthetic vision, though. Practically speaking, it's the map position updates and the position part of synthetic vision that you'd notice, and probably not even unless you're looking really closely. All of that said, if you're IFR we'd recommend having some secondary GPS source so that if your 430W were to go away, you still have a way to navigate. The SV-GPS-250 would work in your scenario.

 

[dutchroll]

Sort of related to the original question and it doesn't seem entirely clear in the latest manual:

Our authorities in Australia have decided in their infinite wisdom that nothing other than a TSO'd GPS source will satisfy their ASDB requirements. Thus the GPS-2020 unfortunately will not qualify ("tested to be as good as" doesn't provide the butt-covering they desire, it actually needs the paperwork).

However I already have a TT22 transponder, and certainly the TN70 as a GPS source does qualify and would be a relatively simple installation in my panel real-estate starved plane.

If I then decide to do a panel upgrade to a Skyview system like I'm considering, can I use the 2nd serial port (NMEA data out) on the TN70 with its 5 Hz update rate to provide the position source for Skyview? Thus having the TN70 provide the Skyview mapping system position source instead of the GPS-2020 and alleviating the need to install and wire another GPS antenna while still keeping my ADSB installation compliant (in our country)?

 

[Dynon]

That should work, although we haven't had a TN70 physically hooked up to confirm perfect compatibility. SkyView can take its baud rate though.