Re: VLF: W4DEX to DL4YHF at 8822 Hz

[Paul Nicholson <vlf0403@abelian.org>]

Spectrogram of W4DEX at Forest, VA (Mike Smith KE4RJQ) showing
a very strong signal at range 254km,

 http://abelian.org/vlf/tmp/141216b.png

I played around with gnuplot to make this fancy 3D spectrogram
at a wider bandwidth which reveals some short period fluctuation
of the amplitude

 http://abelian.org/vlf/tmp/141216c.png

In Todmorden, Dex was his usual signal strength on the loop rx

 http://abelian.org/vlf/tmp/141216d.gif

giving an average 15.8dB S/N from 00:00 to 04:00.

Only a faint trace of the signal at Cumiana last night.  Best I
can get is 8.6dB S/N on a 5 hour average and that doesn't
stand out on a spectrum and certainly isn't significant against
the noise.

--
Paul Nicholson
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