AXP340/322 ADS-B Transponder - APX340

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APX340 - No ADSB

Printed From: Avidyne
Category: Avidyne General
Forum Name: AXP340/322 ADS-B Transponder
Forum Description: Topics on the Avidyne AXP340/322 ADS-B Transponder
URL: https://avidynelive.com/forum_posts.asp?TID=1996
Printed Date: 26 Mar 2026 at 1:01pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com

Topic: APX340 - No ADSB

Posted By: SWooding
Subject: APX340 - No ADSB
Date Posted: 10 May 2020 at 4:21pm

Technical issue.

Any help on why I loose my ADSB in flight

It disconnected and the APX40 shows just dashes for position

Tried to cycle the APX340, powered down and restart, to no avail.

Landed and after fueling, restart and took off for home, still no ADSB, dashes.

Thanks in advance.

Replies:

Posted By: Ibraham
Date Posted: 10 May 2020 at 5:35pm

What is the GPS source for the AXP340?

Posted By: SWooding
Date Posted: 10 May 2020 at 5:39pm

IFD 550

Posted By: Ibraham
Date Posted: 10 May 2020 at 6:08pm

If the IFD is working, then it could be the wiring from the IFD to the AXP.

Posted By: Ibraham
Date Posted: 10 May 2020 at 6:19pm

Were any of the settings recently changed on the IFD (RS-232 ), or was the software recently updated?

Posted By: SWooding
Date Posted: 11 May 2020 at 4:23am

It’s an interment problem

Settings have been the same

It was working, then it stops, ForeFlight announces, ADSB disconnected

Software 10.2.4.1 upgrade before I got plane out of shop

Posted By: Ibraham
Date Posted: 12 May 2020 at 8:08am

If it worked initially after you got it out of the shop, and if everything else is working (IFD, ALT encoder), it could be the wiring from the IFD to the AXP (loose connector/wire). You may need to take back to the shop.