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1. VLF: PSK on 3.3 kHz by cavers (score: 1): Author: Stefan Schäfer <[email protected]>; Date: Wed, 19 Jan 2011 19:14:20 +0100; VLF, A friend of me, F1BKM has told me about a recent french VLF experiment on 3.3 kHz. It seems they crossed 300m in PSK31 at 3.3 kHz. Many photos are visible at http://f6kcz.free.fr/Actualites/2011; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00387.html (8,588 bytes)
2. Re: VLF: PSK on 3.3 kHz by cavers (score: 1): Author: John Rabson <[email protected]>; Date: Thu, 20 Jan 2011 09:00:00 +0100; Using about 4W RF on 87kHz USB, we found that using an earth electrode system underground insted of a small loop gave up to 31dB stronger signal on the surface (Kingsdale Master Cave valley entrance; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00682.html (11,000 bytes)
3. Re: VLF: PSK on 3.3 kHz by cavers (score: 1): Author: "Markus Vester" <[email protected]>; Date: Wed, 19 Jan 2011 23:30:01 +0100; Hi Stefan, thats interesting! Any idea of what's inside that long grey tube? I would presume it's a coil wound around an iron powder or ferrite bar, kind of large loopstick. Reminds me of our recent; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-01/msg00810.html (10,040 bytes)

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