Source of static on comms

Hang 4

Hang 4

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Aug 18, 2017
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Hang 4
I had a sudden bout of static on my radios in flight yesterday. Varied with engine speed, louder at higher rpms (fixed pitch prop) and a bit in and out in turbulence. Got really bad on landing to the point where I couldn't hear anything. Transmissions seemed OK, tower could hear me.

Looked around and saw the shielding on the wire to the upper #4 plug pulled away from the magneto cover. 99% sure this is the cause. Does this make sense?
IMG_0178.jpeg
 
Run the motor with this mag off and see if it changes anything.
 
my static came from a cheap 12v power adapter going bad. got a nicer one and static all gone.
 
Hang 4 said:
I had a sudden bout of static on my radios in flight yesterday. Varied with engine speed, louder at higher rpms (fixed pitch prop) and a bit in and out in turbulence. Got really bad on landing to the point where I couldn't hear anything. Transmissions seemed OK, tower could hear me.

Looked around and saw the shielding on the wire to the upper #4 plug pulled away from the magneto cover. 99% sure this is the cause. Does this make sense?
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I installed a LED light in the ceiling of the cockpit that made the radios un useable.
 
Turned out to be a rear headphone jack that had unthreaded itself. Vibration/turbulence worked it loose and a "firm" landing dropped it completely. I rarely have rear seat passengers, so never thought to check back there. Ignition wire was a false clue.
 
Glad you figured it our. Electrical gremlins are the worst. Very hard to trouble shoot.
 
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