Check out the block diagram:
http://www.elecraft.com/manual/KX3%20Manual%20Block%20Diagram.pdf
You can see the RX I/Q output comes after the preamp, and so will be affected
by the preamp setting.
I have to say, if the band noise is so high as to make everything green on the
screen, does it make sense to run the preamp? If your S-meter is moving with
the preamp off, then you already have plenty of sensitivity for the conditions,
and turning the preamp on becomes a little counter-productive.
73,
Matt VK2RQ
> On 14 Dec 2014, at 3:38 am, Thorpe, Jeffrey wrote:
>
> I was under the assumption (yeah - I know...) that the IQ output was
> "unmodified" by your settings on the radio. However, when I run the IQ out to
> my panadapter (I use iSDR on my iPad Air through a stereo USB soundcard) I
> pretty much have to turn the PreAmp off. With it on I get a full screen of
> "green" on the waterfall. With it off the green is just where there is
> activity.
>
> So, do I have some setting that needs adjusting (aside from turning off the
> PreAmp)?
>
> Jeff - kg7hdz
>
>
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