Transponder whine?

imwithtuxedo

imwithtuxedo

Pre-takeoff checklist
Joined
Nov 4, 2016
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OKC
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J
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?

 
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?
 
NavAir said:
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?
Click to expand...

Transponder itself.
 
imwithtuxedo said:
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?

Click to expand...
I hear it, but it's difficult to hear over all the other racket.
 
Sounds like a noisy switching supply in the xpndr...
 
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.
 
Is there a fan in the transponder that may be causing it?
 
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