Transponder whine?

imwithtuxedo

Pre-takeoff checklist
Joined
Nov 4, 2016
Messages
157
Location
OKC
Display Name

Display name:
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?
 
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?

Transponder itself.
 
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?

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?
 
Back
Top