[Elecraft] Heil Proset & K3 Audio fixed, sort of.

[Paul Fletcher]

In order to try and eliminate the objectionable "noise" (careful avoidance of
distortion, harmonics etc deliberate) in my headset I've fitted an LC filter
with a 4kHz cut off. This would still pass odd order harmonics for lower
audio frequencies. This filter has totally eliminated the annoying "noise" I
was hearing with the downside that I have to run more AF gain to compensate.
This kind of backs up previous measurements made by others that the
harmonics are well down, and not noticeable. It's a bit disappointing that I
had to do this but the headphone audio is now very nice indeed.

73 Paul.
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