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

[Jack Smith]

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.
>