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

[Alexander Ponomarenko]

Barry,
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

Alex de UR5LAM

Alex Ponomarenko wrote:
> 2008/11/13 Barry N1EU <barry.n1eu at gmail.com 
> <mailto: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.
>