KX3 IQ output question

[Thorpe, Jeffrey]

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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[vk2rq]

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 <[hidden email]> 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
>
>
> ______________________________________________________________
> Elecraft mailing list
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[Thorpe, Jeffrey]

Yep, I've been leaving it off. I was curious though, as I thought I'd read something different. Forgot about the block diagram.  Thank-you Matt.

Jeff - kg7hdz

>
> 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
>>
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