Joe, got her! Partial decode of the first half of the first transmission, at 21:10. Very nice! 73, Markus (DF6NM) --Ursprüngliche Mitteilung-- Von: jcraig <[email protected]> An: rsgb_lf_group <rsgb_lf_g
Here's the "official" decode of the full sequence, ending 21:21. Today there's more QRN but not an issue. Thanks to you and Paul for the fine work, compliments to Tangles - she's famous now! 73, Mark
Paul, I think it's just an artifact from the file ending in the middle of the sequence. It seems that non-existing symbols with null amplitude are not being counted as symbol errors, which severely b
And any proper test will sometimes fail ;-) No success here on the 21:30 transmission, only a couple of bogus decodes with very high rank numbers. The signal is competely invisible now, and to make t
Yes it seems to be loosing a few seconds - 22:00 and 22:30 decoded alright but had to shift the timing (though I don't trust my timestamps too much any more). start Eb/N0 time offset UT dB seconds 21
Signal got better later, and is still visible as a blue haze in last night's TA spectrograms https://dl.dropboxusercontent.com/u/26404526/LF_old/LF_lastnight.htm . All messages up to 2 UT decoded nic
Andy, maybe you're right, see also Planck's formula E = h f. But then, maybe not - consider radiated power from a given antenna height and current Prad = i^2 * 1579 ohm * (h / lambda)^2 which clearly
Thanks Paul for the fix! Well we got this big forbidden bandgap between 135.7 and 8.3 kHz, so the challenge is going to be a big jump rather than a gentle push. But Dex has done it, and I'm pretty su
Actually, each station operator is using his own unique home-grown setup: Transmitters, Andy: DDS with phase ramp, dedicated controller software Domenico: GPS-locked SSB exciter, SpecLab tone with au
Unfortunately I went to bed too early and didn't start data saves. 73, Markus --Ursprüngliche Mitteilung-- Von: jcraig <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Do,
Too late for 20:00, nil of 21:30, but then a good one at 21:00, +1.3 dB, 1.2s offset. ... Prx > Ptx ? ;-) Andy your spectrogram nicely shows the 0.5 Hz wide "noise hump" from the modulated transmissi
So far I got 2015 Nov 26 start Eb/N0 time offset UT dB seconds 2030 nil 2100 1.3 1.2 2130 3.9 1.5 2200 5.4 1.9 2230 7.4 2.3 Not the faintest trace in any spectrogram here. Paul I was just wondering w
1579 ohms * (10 m / 36145 m) = 121 microohms Joe, if you wanted you could almost copy Stefan's VLF coil described on his website, using thin enameled wire on a large water barrel. Assuming your ante
A few more weaker decodes occurred here around midnight, ending before 1 UT. The spectrogram caught a short carrier around 0:20 UT (spectrum showing on https://dl.dropboxusercontent.com/u/26404526/Eb
Hi Wolf, at our distance, DCF39 is on the order of 3 mV/m. Assuming a best-case daytime band noise of ~0.05 uV/m/sqrtHz, a sensitive antenna could thus produce around 95 dB SNR in 1 Hz bandwidth. But
First three decodes tonight: 2015 Nov 27/28 start Eb/N0 time offset UT dB seconds 2030 2.2 1.2 2100 -0.9 1.2 (after notching QRM) 2130 5.7 1.0 The delay seems to be constant now. The 21:00 sequence w
Here is the result list for VO1NA last night: 2015 Nov 27/28 start Eb/N0 time offset UT dB seconds 2030 2.2 1.2 2100 -0.9 1.2 (after notching QRM on 137776.98) 2130 5.7 1.0 2200 3.1 1.1 2230 4.5 1.2
Ok Andy, you're right, I forgot the squares. But then, citing your email from Nov 19: ...should 've been 2^2 / SQRT("), or not? Hee hee, one for you, one for me;-) 73's, Markus --Ursprüngliche Mittei
Got a few successful decodes but only after midnight: 2015 Nov 29 start Eb/N0 UT dB 0000 7.1 0030 7.6 0100 1.8 0230 2.2 0530 3.7 0600 5.3 0630 7.7 0700 3.8 I found that I needed the same time offset
