Bear in mind that the radios involved may have different front
ends. It might just be a coincidence that your handheld and
panel radios are affected and nothing to do with the airframe.

How about 127.00-10.7 (IF mixer) = 116.30
116.30/2 = 58.15?
(i.e. mixing of the second harmonic of 58.15MHz)

Ok, unlikely, just playing with numbers!

Paul
G1YJY

"Snowbird" wrote in message
om...
Update: I talked to a local DE who is also doing piles of
instrument instruction. She says she's flying in beaucoup
planes in that area, without the same problem.