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Date: Thu, 23 Mar 2017 17:52:21 -0400
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Subject: RE: ULF: New carrier near 2970 Hz...
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Geomagnetic K-index elevated March 21 through March 23, approximately  3 < Kp < 4 but higher in Europe with levels at Wingst and Niemegk varying by 50nT to 80nT at times during that period.

Mentioning this in case it applies to received phase of the 2970 signal.

But now wondering if this disturbance should be thought of as cause or effect, with 2970 TX currents having grown to 180 mA.  

Jim AA5BW 


-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of DK7FC
Sent: Wednesday, March 22, 2017 9:15 AM
To: rsgb_lf_group@blacksheep.org
Subject: Re: ULF: New carrier near 2970 Hz...

Hi Paul,

Interesting. Do you also use the noise normalisation function which proved to be useful in recent stackings on 5170 Hz?

Still a few weeks before the 6 channel input soundcard for the Raspi appears...

73, Stefan

Am 22.03.2017 11:25, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > Isn't it extremely unlikely that this is something elso than my 
> > signal??
>
> Well I don't know.  It would be an extraordinary achievement for your 
> 2970 signal to reach this far.  It needs a result
> that can stand up to scrutiny.   I'd like to do some more
> work with it to get an unequivocal detection at 5 sigma.
>
> > I'm going to run the carrier another few days, at least until 
> > friday,
>
> A few more days signal will help.   Adding 21st didn't
> improve the peak, nor did the blanker settings I left running last 
> night.
>
> For these runs I am blanking each antenna channel independently, then 
> mixing and phasing.  Usually I do the mixing first and blank the 
> composite signal.
> While one channel is blanked and another isn't, the mix is wrong.  
> That ought to be worse than blanking after the mix.  With less than 5% 
> blanking factor it might not be much of an issue either way.
>
> I can also look again at your previous 2970 tests, stacking the same 
> 14:00 to 19:00 window.
>
> --
> Paul Nicholson
> --
>