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From: Roger Lapthorn <rogerlapthorn@gmail.com>
Date: Wed, 21 Nov 2018 14:21:25 +0000
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Subject: Re: SLF: Receiving the American power grid?
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Yes, I can see it faintly.It would be good to look at 60Hz in a much
narrower bandwidth?

73s
Roger G3XBM


On Wed, 21 Nov 2018 at 13:17, DK7FC <selberdenken@posteo.de> wrote:

> Hi SLF friends,
>
> Take a look at
> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html
> There, on the 4th image from the top you can see a faint but
> concentrated trace at 60 Hz. This should be the 60 Hz grid frequency as
> used in NA and SA. It has been detected in a smaller bandwidth in the
> past, but from this location on the tree, it is the first time that i
> see it in 45 mHz FFT bin width.
> The QRN is very low these days, in that range!
>
> 73, Stefan
>
> PS: At 16 2/3 Hz you can see the German railway power grid changing its
> colour, depending on where trains are currently driving.
>
>

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<div dir=3D"ltr"><div>Yes, I can see it faintly.It would be good to look at=
 60Hz in a much narrower bandwidth?</div><div><br></div><div>73s</div><div>=
Roger G3XBM</div><div><br></div><div><br></div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr">On Wed, 21 Nov 2018 at 13:17, DK7FC &lt;<a href=
=3D"mailto:selberdenken@posteo.de">selberdenken@posteo.de</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex">Hi SLF friends,<br>
<br>
Take a look at <br>
<a href=3D"http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2=
.html" rel=3D"noreferrer" target=3D"_blank">http://www.iup.uni-heidelberg.d=
e/schaefer_vlf/DK7FC_VLF_Grabber2.html</a> <br>
There, on the 4th image from the top you can see a faint but <br>
concentrated trace at 60 Hz. This should be the 60 Hz grid frequency as <br=
>
used in NA and SA. It has been detected in a smaller bandwidth in the <br>
past, but from this location on the tree, it is the first time that i <br>
see it in 45 mHz FFT bin width.<br>
The QRN is very low these days, in that range!<br>
<br>
73, Stefan<br>
<br>
PS: At 16 2/3 Hz you can see the German railway power grid changing its <br=
>
colour, depending on where trains are currently driving.<br>
<br>
</blockquote></div>

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