Spectrogram of W4DEX at Forest, VA (range 254km) http://abelian.org/vlf/tmp/141202a.png No sign of any frequency lock problems now. All the energy is concentrated in one frequency bin so the signal a
Another plot from Wolf's receiver at Bielefeld, http://abelian.org/vlf/tmp/141202e.gif This covers the full transmission from 22:30 UT in 50.5 uHz bandwidth. The line at 8820.0000 is 11.7 dB above th
Paul, once more, very impressive work! I'm tempted to call that a TA first for Dex and Wolf, and Renato at even larger distance is getting very close. But most of all, I think it's the cooperative ef
Indeed it is tempting. With that 50.5 uHz spectrum the odds of a false peak is probably one in a few tens of thousands. Perhaps Dex should change frequency a small amount before tonight's transmissio
Hello Paul, Markus, Dex and all, Thanks for the details and the effort - well done ! In fact 'VLF6' is rather noisy, partly due to the fact that it uses an analog FM link to carry the broadband VLF s
I swept a range of times and bandwidths and this one from Bielefeld is even more convincing http://abelian.org/vlf/tmp/141202j.gif That's 13.4 dB S/N averaged over the 3 hours. More from LWPC Bielefe
Examining W4DEX at Todmorden overnight on 1st/2nd Dec... S/N dB in 278uHz and signal phase in 1 hour steps: From dB phase 22:30 7.6 80.4 23:00 8.9 90.9 23:30 9.1 115.6 00:00 6.3 106.2 00:30 7.9 30.6
Paul, Good info and results! LWPC is acknowledged as having a rather poor terminator model; no suggested workaround that I know of, other than customized LWPC or other customized EIW modeler. Do you
A spectrum from the natural radio receiver at Sebring Florida 27.516N,81.517W range 869.4 km run by Joel Gonzalez, http://abelian.org/vlf/tmp/141204b.png S/N is 12.6 dB in 55.5 uHz. The noise level t
