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

[Alex Ponomarenko]

2008/11/13 Barry N1EU <barry.n1eu at gmail.com>

>
>
> Alexander Ponomarenko-5 wrote:
> >
> > all these measurements, for all radios has been via PHONE-OUT.
> > There is two-tone measurements, but you can see these IMD even with XG1
> > set to s9-level.
> > Here is my K3 with s9-signal from XG1:
> > - ATT On http://forum.cqham.ru/download.php?id=32030
> > - ATT/PRE Off http://forum.cqham.ru/download.php?id=32031
> > - PRE On (it's terrible)  http://forum.cqham.ru/download.php?id=32032
> >
>
> Please take two consecutive spectrum readings with PRE On, AGC Off from the
> headphone jack - take one with S9 signal from XG1 and take the second with
> the XG1 generator turned off (i.e., with no signal in the passband).
>  Please
> post these two spectra.
>
> I suspect many of the spikes in your spectrum reading are not related to
> the
> received signal.
>
> Thanks,
> Barry N1EU
>
>

Barry,

S9 with Pre On, AGC Off you can see in my previous message.
Here is plot without XG1-tone-signal (here is from line-out, but via PHONES
it's equal, yes, tomorrow you will see both plots for PHONES-out):

http://forum.cqham.ru/download.php?id=31532

Guys, do you remember as we has built ours K2's?
Do you remember the Spectrogram-soft? Try use it and you will see these
plots.

Alex de UR5LAM
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