Transponder whine?

Discussion in 'Avionics and Upgrades' started by imwithtuxedo, Nov 25, 2019.

  1. imwithtuxedo

    imwithtuxedo Pre-Flight

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    Turned on my transponder today with engine off and it was making an audible whine when turned on. Not sure if I’ve turned it on without the engine running. Thoughts on the cause?

     
  2. NavAir

    NavAir Pre-takeoff checklist

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    Is the whine coming from the transponder itself, or is it electrical noise being picked up by the audio panel or one of the radios and heard through the speaker?
     
  3. imwithtuxedo

    imwithtuxedo Pre-Flight

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    Transponder itself.
     
  4. Salty

    Salty Final Approach PoA Supporter

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    I hear it, but it's difficult to hear over all the other racket.
     
  5. idahoflier

    idahoflier Line Up and Wait

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    Sounds like a noisy switching supply in the xpndr...
     
  6. Clip4

    Clip4 Final Approach

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    Was that video made in 1990?
     
  7. Sinistar

    Sinistar En-Route

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    I think I just pulled out the same model this summer for ADSB. Make me a tempting offer. Its just sitting in a box....like about 9,000 other old transponders.
     
  8. imwithtuxedo

    imwithtuxedo Pre-Flight

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    I might hit you up on that.
     
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  9. Doug Reid

    Doug Reid Pre-takeoff checklist

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    Are you sure your electric turn coordinator is not running ?
     
  10. weirdjim

    weirdjim En-Route

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    Where is the wife when this is going on?

    Jim
     
  11. mkosmo

    mkosmo Pattern Altitude

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    Is there a fan in the transponder that may be causing it?