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 <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>
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.
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