Hello Wolf, Paul, ULF,
This is a most exiting result, 3 wavelengths on the 101 km band :-)
Thanks to Paul for extracting my signal from Wolf's stream. Thanks
Wolfgang for providing the VLF/ULF RX system!
And congrats to our result, it is the first detection of an amateur
generated RF signal on ULF over a distance greater than 1 wavelength!
Also you are the first one except myselfe who picked up the signal!
I remember that 2970 Hz / 101 km story has started in summer 2016 and
the first experiments were over quite short distances (3.5km, 7.9km,
17km (1st far field), 31km, 65km...) and was not seen as something that
could be done over serious distances.
>From now on i can say that it was worth to wind the large ULF coil
having 6.1 H inductance, several thousand turns on a 0.25 m diameter
tube, and > 5 kg of 0.4mm copper wire.
I am optimistic to pick up the signal from my recording in France,
which would then also mean a first international detection of amateur
generated ULF signals. The results will be there during the week...
73, Stefan
Am 22.01.2017 17:42, schrieb Paul Nicholson:
A six sigma detection of DK7FC at DL4YHF's VLF rx at Bielefeld.
A record distance of 303.8 km.
http://abelian.org/vlf/tmp/170121a.png
S/N is 15.9 dB in the 9 hour integration. The signal has been
through a stage of vorbis compression/decompression.
This is the first time I've found Stefan's signal at Bielefeld.
Not a trace of the signal at Cumiana or Todmorden.
--
Paul Nicholson
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