Interperating FAA ADS-B check

[nigelspeedy]

G'day Dynon,

I have your 261 transponder linked to a Garmin 430W as my ADS-B out solution. I recently did the FAA ADS-B check, i.e. sent them an email with the aircraft details and they responded with a report and I am after a little help figuring out if my system is working properly.

All the position and kinematic data are good. Under the listing of Integrity and Accuracy I get 0 for SIL and SDA which I understand is normal for non certified avionics. What I am not sure about is the fact that I have an 18 second Validity (VAL 1.59%) Failure. I'm not even sure what this is or how to go about trouble shooting it. Any ideas would be much appreciated.
Cheers
Nigel

 

[dynonsupport]

Nigel,
Your SIL/SDA should not be 0 if things are configured correctly. They should be 3/2. You should fix that before worrying anything else, since the mis-configuration may be the source of other errors.

You need to be connected directly to the transponder with a serial wire out from the 430, and you have to be using the ADS-B+ format (not just ADS-B). Only versions 5 and newer of the 430 firmware have ADS-B.

 

[nigelspeedy]

Thanks for the quick response. I am pretty sure I have the 430 connected directly via serial to the Txpdr and that it has the latest firmware but I will double check and also to see that I have it configured correctly to ADS-B+.
Cheers
Nigel

 

[nigelspeedy]

I checked today that I have 5.03 version software in the 430. I found that I had in the Main RS232 Config menu the ADS-B OUT rather than ADS-B OUT+. I have since changed it and will report back how it goes. Thanks for the config help.
Cheers
Nige

 

[nigelspeedy]

So a couple of problems on my end with the configuration. I changed the Garmin output to ADS-B+, and also configured the Skyview transponder menu to use the Garmin as its source vice Skyview which was how it was. Unfortunately after these changes I get a transponder error saying the GPS source is offline. When constructing the aircraft I did hook the Garmin serial port up with the required resistor. Any ideas would be much appreciated.
Cheers
Nigel

 

[krw5927]

What is on the other end of said wire with resistor? It should be going directly to the transponder and nowhere else.

 

[dynonsupport]

Nigel:

Especially in Tech Support issues like this, pictures (screenshots) are worth a thousand words. To record a screenshot, insert a USB flash drive and push buttons 2+7. The screenshot will be recorded in a "screenshots" folder on the USB flash drive.

If:
* You have changed your Garmin unit configuration of the serial port you used to output ADS-B+ format...
* You have connected that serial port TX, through the resistor, to Pin 3 of the SV-XPNDR-261/262 (RX for GPS data)...
* You have configured SkyView: SETUP MENU > TRANSPONDER SETUP > GPS DATA (xxxxx): GARMIN ADS-B/ADS-B+
...

It should work. Some common issues:
* You're in the hangar, so the Garmin GPS can't see the sky and get a lock on the GPS constellation, so it cannot provide a good position / data stream.
* Your Gamin unit has not new enough, or hasn't been updated, to have the option of ADS-B+ (actually configured to output ADS-B format, not ADS-B+ format)
* The serial port you configured on the Garmin unit isn't actually the serial port you wired up to the SV-XPNDR-261/262
* You actually connected the RX pin of the serial port on the Garmin unit, not the TX pin.
* Your SkyView display is not updated to the latest version of firmware (currently, v13.0.3) or your SV-XPNDR-261/262 isn't updated to the latest version of transponder firmware (currently, [on STATUS line] SW02.04).

Let us know what you find.

So a couple of problems on my end with the configuration. I changed the Garmin output to ADS-B+, and also configured the Skyview transponder menu to use the Garmin as its source vice Skyview which was how it was. Unfortunately after these changes I get a transponder error saying the GPS source is offline. When constructing the aircraft I did hook the Garmin serial port up with the required resistor. Any ideas would be much appreciated.
Cheers
Nigel

 

[nigelspeedy]

Thanks for the detailed reply, I will get to work and report back.

If I just replaced my old Skyview GPS with the new ADS-B one and selected Skyview as the source would that work?

Cheers

Nigel

 

[dynonsupport]

Nigel:

We're not yet shipping the SV-GPS-2020 (the new one that would enable ADS-B compliance). But yes, if you replaced the SV-GPS-250 with the upcoming SV-GPS-2020, it will be usable as the GPS source for ADS-B out.

That said, your current SkyView + GTN combinatio is known to work - you've either got a wiring or configuration issue, and we can definitely work on getting you squared away.

Thanks for the detailed reply, I will get to work and report back.

If I just replaced my old Skyview GPS with the new ADS-B one and selected Skyview as the source would that work?

Cheers

Nigel