It suggests that perhaps you were hearing the artifacts > 4 KHz, such
as the 12 KHz with modulation sidebands or the one at 3.9 KHz. Maybe you
were not hearing the artifacts directly but beats amongst them?
Jack K8ZOA
Paul Fletcher wrote:
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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