K3 - Sensitivity drop between Low and Hi power

[Max iw0gxy]

Hi all,
I connected the XG2 signal generator to my K3 and I've injected 50microV into the antenna. I have the standard S9 but when I rise the power to 13 and up signal drop down to S8. If I turn the knob to 12W or less signal turn back to S9.
I've noted this behavior on signals on air but to be sure I've used my signal generator.

Did someone noted the same behavior?

Max IW0GXY

[Vic K2VCO]

max iw0gxy wrote:
> Hi all,
> I connected the XG2 signal generator to my K3 and I've injected 50microV
> into the antenna. I have the standard S9 but when I rise the power to 13 and
> up signal drop down to S8. If I turn the knob to 12W or less signal turn
> back to S9.
> I've noted this behavior on signals on air but to be sure I've used my
> signal generator.

I do not see any change in received signal levels here when switching
between low and high power.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Max iw0gxy]

Seems I've found the problem but I should wait till monday to try to fix it.
As suggested by Gary at Elecraft I've checked some components and I found Q9 on the KPA3 board broken.
I think Q9 is both responsible of the power instability I've found and the drop in a S point when KPA3 was enabled.
I'll let the list know.

Max IW0GXY  

Vic K2VCO wrote

max iw0gxy wrote:
> Hi all,
> I connected the XG2 signal generator to my K3 and I've injected 50microV
> into the antenna. I have the standard S9 but when I rise the power to 13 and
> up signal drop down to S8. If I turn the knob to 12W or less signal turn
> back to S9.
> I've noted this behavior on signals on air but to be sure I've used my
> signal generator.

I do not see any change in received signal levels here when switching
between low and high power.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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Post to: [e-mail]
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Elecraft web page: http://www.elecraft.com