AXP340 random switch to 1200
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=1050
Printed Date: 26 Mar 2026 at 2:12pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com
Topic: AXP340 random switch to 1200
Posted By: bcool
Subject: AXP340 random switch to 1200
Date Posted: 23 Apr 2016 at 4:29pm
| Had a weird one tonight...was shooting practice approaches in the St Louis Bravo, using a squawk code of 0233 (or something like that). All of a sudden ATC asked, what happened to your squawk code? I looked at the xpndr and it was showing 1200(!). Very odd...anyone else ever experience that? |
Replies:
Posted By: oskrypuch
Date Posted: 23 Apr 2016 at 5:31pm
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Any chance you inadvertently pushed the VFR button. I have done that more than once, looking to push the IDENT. * Orest |
Posted By: Gary T
Date Posted: 24 Apr 2016 at 4:29am
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Could a momentary loss of power to the AXP340 cause the squawk code to reset to 1200?
------------- Gary-T |
Posted By: oskrypuch
Date Posted: 24 Apr 2016 at 5:48am
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If it was a VFR button push, by mistake or if the VFR button is wonky and responding to vibration, pushing the VFR button again would restore the original code. If it was a power flicker, and your unit is set to reset to the VFR code, then pushing the VFR button again would do nothing I expect. * Orest |
Posted By: bcool
Date Posted: 01 May 2016 at 6:55am
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No, I'm sure I didn't press the VFR button...my box is too far off to the right to get accidentally near it :) I didn't know about pushing the VFR button to switch back to the previous code...I'll have to try that if it happens again. |
Posted By: Royski
Date Posted: 05 May 2016 at 11:55am
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Sounds scary — squawking 1200 anywhere near my home airport is cause for action against the pilot's certificate. Anyway a power flicker shouldn't reset the unit to 1200, or at least it doesn't in mine, as the code survives the power being off for weeks. |
Posted By: oskrypuch
Date Posted: 05 May 2016 at 1:27pm
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On the 340 the code survived a power reset. On my new remoted 322, the code resets on power up, to whatever you have set as the default. Guess you'd want to change that to something other than 1200, if you fly through that area. * Orest |
Posted By: AviJake
Date Posted: 07 May 2016 at 11:36am
What does that mean? Are you saying the 322 resets to 1200 at every power up? That should definitely not be the case. ------------- Steve Jacobson sjacobson@avidyne.com |
oskrypuch wrote:Posted By: oskrypuch
Date Posted: 07 May 2016 at 1:17pm
Well, yes, mine does. Code is 1200 on every power up. I did explicitly confirm this on one shutdown. And, it is rare that I fly with a 1200 code, yet it is 1200 on every powerup. Do I have an issue? How do I proceed? * Orest |
Posted By: Gring
Date Posted: 07 May 2016 at 1:32pm
| My AXP340 transponder retains the last code. |
Posted By: oskrypuch
Date Posted: 07 May 2016 at 2:02pm
Same with my AXP340. But since I moved to the AXP322, it doesn't. * Orest |
Posted By: DavidBunin
Date Posted: 08 May 2016 at 12:24pm
The 322 is controlled remotely (by your IFD?) so the test would be to cycle power on each unit separately and see if the "default" functionality resides within the transponder or within the control panel (the IFD). Perhaps you are observing the IFD powering up with a 1200 control code for the transponder? David Bunin |
Posted By: oskrypuch
Date Posted: 08 May 2016 at 2:07pm
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Can do, but it is academic, as either way, it will still power up with 1200. * orest |
Posted By: DavidBunin
Date Posted: 09 May 2016 at 11:19am
| Not academic to the people who need to engineer a solution. |
Posted By: oskrypuch
Date Posted: 09 May 2016 at 1:10pm
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The 540 just acts as a control head for the 322, but will check it next time I'm in the plane. * ORest |