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Used transponder test?

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CardinalNSB(at)aol.com
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Posted: Fri Feb 11, 2011 8:44 am Post subject: Used transponder test?

Is there a way to test the cavity tube easily and cheaply using cheap  tools, to at least weed out bad cavity tubes before paying an avionics shop for  testing?  Thank you.  Skip

  

  

  [quote][b]

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nuckolls.bob(at)aeroelect
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Posted: Fri Feb 11, 2011 9:32 am Post subject: Used transponder test?

At 11:28 AM 2/11/2011, you wrote:

  	  Quote: 	
		   Is there a way to test the cavity tube easily and cheaply using cheap tools, to at least weed out bad cavity tubes before paying an avionics shop for testing?  Thank you.  Skip

  

  	


      Easy and cheap need quantification. There ARE ways

      to exercise a transponder into 'sqittering' a stream

      of replies by hitting it with certain noise sources.

      A line operated drill motor has been shown to be

      an effective test tool for this purpose.



      Then you need a diode detector teed into the

      feedline attached to a 'scope for the purpose

      of watching the width and magnitude of reply 

      pulses. Finally, there is a lesser concern for

      being tuned to the right frequency.



      Of course, you can also just go fly the thing.

      Make a temporary installation and see if center

      can read your mode c replies. You COULD also

      build a jeep box that would simulate encoder inputs

      to check altitude reporting too.



      What you might want to do is negotiate a go/no-go

      bench test as opposed to a full stroke through the

      gyrations that would win a yellow-tag for the

      transponder.



 

   Bob . . .    [quote][b]

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