[Elecraft] K3 Audio

[Paul Fletcher]

Jim Brown-10 wrote:
> 
> I'm also not convinced that this particular screen shot is non-
> linear distortion. It could be aliasing in the FFT software that's 
> part of the decoder. 
> 

Jim,

Just re-read this and got your point. This is interesting as I've observed
identical issues. When monitoring a PSK31 signal using a narrow filter I
could see a "ghost" signal on the waterfall which was at odd multiples of
the base AF. I could also decode the ghost signal implying phase info was
intact as was the bandwidth of the signal. This would imply some kind of
harmonically related alias - not a simple harmonic. The sound card was way
off clipping and line out was set low (can't remember exact setting but it
was not greater than 4) and I've used this card (an Edirol FA66) with other
radios for PSK using the same software without problems.

Not sure if you read my other post but these effects are also audible in the
cans (with my good ear!)

Paul M1PAF
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