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AXP340 random switch to 1200

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bcool View Drop Down
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    Posted: 23 Apr 2016 at 9:29pm
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?
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oskrypuch View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 23 Apr 2016 at 10:31pm
Any chance you inadvertently pushed the VFR button. I have done that more than once, looking to push the IDENT.

* Orest



Edited by oskrypuch - 24 Apr 2016 at 10:46am
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Gary T View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary T Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2016 at 9:29am
Could a momentary loss of power to the AXP340 cause the squawk code to reset to 1200?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 2016 at 10:48am
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



Edited by oskrypuch - 24 Apr 2016 at 10:49am
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bcool View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bcool Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 2016 at 11:55am
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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Royski Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2016 at 4:55pm
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.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 05 May 2016 at 6:27pm
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

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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviJake Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2016 at 4:36pm
Originally posted by oskrypuch oskrypuch wrote:


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


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
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oskrypuch View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2016 at 6:17pm
Originally posted by AviJake AviJake wrote:

What does that mean?  Are you saying the 322 resets to 1200 at every power up?  That should definitely not be the case.

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



Edited by oskrypuch - 07 May 2016 at 6:18pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gring Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2016 at 6:32pm
My AXP340 transponder retains the last code.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2016 at 7:02pm
Originally posted by Gring Gring wrote:

My AXP340 transponder retains the last code.

Same with my AXP340. But since I moved to the AXP322, it doesn't.

* Orest



Edited by oskrypuch - 07 May 2016 at 7:08pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DavidBunin Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2016 at 5:24pm
Originally posted by oskrypuch oskrypuch wrote:

Originally posted by Gring Gring wrote:

My AXP340 transponder retains the last code.

Same with my AXP340. But since I moved to the AXP322, it doesn't.


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

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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2016 at 7:07pm
Can do, but it is academic, as either way, it will still power up with 1200.

* orest

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Post Options Post Options   Thanks (0) Thanks(0)   Quote DavidBunin Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2016 at 4:19pm
Not academic to the people who need to engineer a solution.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oskrypuch Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2016 at 6:10pm
The 540 just acts as a control head for the 322, but will check it next time I'm in the plane.

* ORest

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