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lots of radio static at RPM's over 2000

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michael101

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1965pa 28 140
narco mk 12d
garmin 420 GPS/Comm

on the ground/taxi/descent/pattern i can hear/transmit radio Comm1/Comm2 with no issues
on the ground i can transmit, no problems
flying along at 2400 rpms constant static.
tried both radios
fiddle with the headset jack inputs
not the headset
two headsets plugged in, both static
on the panel, tried Com1/com2/both
no change
no luck

any thoughts?
thanks
 

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