[K3] [Elecraft] in-band-IMD test

[Barry N1EU]

Alexander Ponomarenko-5 wrote:
> 
> yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES 
> or LINE OUT outs.
> 
> The plots from front-panel phones-out is better, but IMD spikes are
> present.
> 
> plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
> S9   PRE On    AGC Off: http://forum.cqham.ru/download.php?id=32057
> S9   PRE On    AGC SLOW: http://forum.cqham.ru/download.php?id=32056
> 

Thanks for running the test again Alex!

First off, is this really IMD we're looking at?  Aren't you injecting a
single signal?  Isn't this harmonic distortion, not IMD?

Looking at the s9 agc off pre on plot, the worst "distortion" product is
still >60dB down.  It would be nice if we saw zero distortion products, but
I suspect that the distortion seen here is completely inaudible.

73,
Barry N1EU
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