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Date: Wed, 21 Nov 2018 14:14:16 +0100
From: DK7FC <selberdenken@posteo.de>
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Content preview: 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 [...]
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Subject: SLF: Receiving the American power grid?
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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.