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Transmitting causes transponder to turn off

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l.p(at)talk21.com
Guest

Posted: Wed Sep 04, 2013 10:18 am Post subject: Transmitting causes transponder to turn off

Bob, and others.



Wonder if you might comment on the following issue.

Yesterday while transmitting on our Garmin 530 the GTX 330 transponder turned itself off.

This happened three times, before  it didn't happen again, strange.

They have separate power supply wires through fuses from the same bus.

Any ideas much appreciated.

Regards.

Patrick Elliott.

G-LGEZ.

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l.p(at)talk21.com
Guest

Posted: Thu Sep 05, 2013 12:40 am Post subject: Transmitting causes transponder to turn off

Bob.

First time it has happened in almost 500 hours of operation.



My initial thought was that, as transmitting takes more power than just receiving, it might be causing a power transient in the shared bus.

How would I check if this is the case?

Patrick Elliott.

G-LGEZ

Time: 05:35:06 PM PST US

From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

Subject: Re: Transmitting causes transponder to turn   off

At 01:16 PM  9/4/2013, you wrote:

 	  Quote: 	
		  Bob, and others.

Wonder if you might comment on the following issue.

Yesterday while transmitting on our Garmin 530 the GTX 330 

transponder turned itself off.

This happened three times, before  it didn't happen again, strange.

They have separate power supply wires through fuses from the same bus.

Any ideas much appreciated.


	


    Has this ever happened before? How many hours

    on the system?

   Bob  href="http://www.matronics.com/Navigator?AeroElectric-List" target="_btp://forums.matronics.com/" target="_blank">http://forums.matronics.com</                     -Mats.com/contribution" =======

 

 



 

 

  

 [quote][b]

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bbradburry(at)bellsouth.n
Guest

Posted: Thu Sep 05, 2013 4:44 am Post subject: Transmitting causes transponder to turn off

Patrick,  

   

This happened to me when I had too many things sharing the same bus.  Have you recently added something that could have caused an overloaded condition?  

   

Bill   

         

  

From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Linda Walker

 Sent: Thursday, September 05, 2013 4:37 AM

 To: aeroelectric-list(at)matronics.com

 Subject: AeroElectric-List: Transmitting causes transponder to turn off  

  

       

   

  

Bob.

 First time it has happened in almost 500 hours of operation.

 

 My initial thought was that, as transmitting takes more power than just receiving, it might be causing a power transient in the shared bus.

 How would I check if this is the case?

 Patrick Elliott.

 G-LGEZ        



 

 Time: 05:35:06 PM PST US

 From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

 Subject: Re: Transmitting causes transponder to turn  off

 

 

 At 01:16 PM 9/4/2013, you wrote:

 >Bob, and others.

 >Wonder if you might comment on the following issue.

 >Yesterday while transmitting on our Garmin 530 the GTX 330 

 >transponder turned itself off.

 >This happened three times, before  it didn't happen again, strange.

 >They have separate power supply wires through fuses from the same bus.

 >Any ideas much appreciated.

 

     Has this ever happened before? How many hours

     on the system?

 

 

   Bob href="http://www.matronics.com/Navigator?AeroElectric-List" target="_btp://forums.matronics.com/" target="_blank">http://forums.matronics.com</                     -Mats.com/contribution" =======

 

 



 

 

  

 [quote][b] Navigator much much href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List Web href="http://forums.matronics.com">http://forums.matronics.com -Matt href="http://www.matronics.com/contribution">http://www.matronics.com/c===========   

  

  

  

  

       [quote][b]

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l.p(at)talk21.com
Guest

Posted: Fri Sep 06, 2013 12:51 am Post subject: Transmitting causes transponder to turn off

Bob.

Electrical system architecture of our Long-EZ is based on the old Z-13 of 11/01  (page Z-11) with a 60 amp B&C alternator and their 32 AH battery, sized for long overwater legs.

I have the Vision MicroSystems VM1000 engine display that includes a voltmeter, which on recent examination is reading incorrectly.

I am about to do a test flight with a multimeter temporarily in place to read what the VMS should be reading, and will report back.

Thanks for your help.

Patrick Elliott.

G-LGEZ



     

________________________________  Message 3  _____________________________________

Time: 06:51:17 AM PST US

From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

Subject: Re: Transmitting causes transponder to turn   off

At 03:36 AM 9/5/2013, you wrote:



 	  Quote: 	
		  Bob.

First time it has happened in almost 500 hours of operation.



My initial thought was that, as transmitting takes more power than 

just receiving, it might be causing a power transient in the shared bus.

How would I check if this is the case?

Patrick Elliott.

G-LGEZ


	


    Can you  describe the architecture of your electrical

    system? Alternator and battery sizes . . . what kind

    of airplane? Do you have a voltmeter in the airplane

    and are the reading(s) normal?



    The added load on a bus by the transmitter is a pittance

    compared to the size of your alternator . . . there's

    no rational reason for an 'overload' condition. If

    it were an overloading situation, then turning on your

    landing lights (assuming incandescent lamps) would

    impose a transient many times greater on the bus . . .

    but a transient that Garmin says is no big deal by

    virtue of their DO-160 qualification testing.

   Bob . . . 





 

 

  

 [quote][b]

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