I grabbed a recording from Bielefeld via Wolf's online receiver. Got the correct message at rank 3721 Eb/N0 = -1.6 dB, BER 41.8%, there were no stronger false decodes, so that's a genuine detection a
http://www.ebay.co.uk/itm/GPS-DISCiPLINED-CLOCK-GPSDO-10MHz-10M-OUTPUT-SQUARE-WAVE-RS232-OUTPUT-GPS-NMEA-s-/252011014153 After some trials I find this GPSDO is not so good after all. The 10MHz output
Your signal gets better with each decode! This one was Eb/N0 = +9.7 dB Summary of recent tests 2016-03-31 22:00 +5.6 dB 2016-04-01 16:00 +7.3 dB 2016-04-02 07:30 +9.7 dB I wondered about that too, m
That looks well made, similar price to the going rate for a Trimble Thunderbolt. Tempted! There is rumour of a firmware upgrade for the BG7TBL device to fix that frequency error problem. I have email
Thanks, I see what's happening. It's the SoX utility which I use to convert the .wav to a data stream. The stupid program assumes that audio samples, even when using IEEE float formats, are restricte
The signal continues to improve! This one decoded here 'WX' with Eb/N0 = +10.7 dB OK that takes an extra 2.5 dB, no problem here. I notice the .wav file start time of Stefan's decode of the 2016-04-
Takes me back to the 1970's when I was a student working for Gerald David at Aerial Facilities in Chesham building these things - http://www.ingenia.org.uk/Ingenia/Articles/240 which worked incredibl
An updated decoder: v0.4c http://abelian.org/ebnaut/win32/ebnaut-rx.exe http://abelian.org/ebnaut/win64/ebnaut-rx.exe fixes a few minor bugs and has a small improvement which can significantly reduce
There are at least two other LF list members who also knew Gerald, including a Chris McCarthy that I remember from AFL who I think may be G3XVL. Small world isn't it? Oops, we've well and truly highj
Another decoder upgrade: v0.4d http://abelian.org/ebnaut/win32/ebnaut-rx.exe http://abelian.org/ebnaut/win64/ebnaut-rx.exe This one has improved memory allocation and list length capability - up to 1
Sorry Stefan, nothing showing for 20:14,+30m in 555uHz. The noise floor there is 0.2 fT probably due to all the thunderstorms in Europe tonight. I expect your signal is down below 0.1 fT. Also checke
This time, a good signal at about 0.35 fT http://abelian.org/vlf/tmp/160414a.gif but the noise was high from the same direction so cannot be avoided by steering the loops away. I don't know if this i
DJ8WX from the 12th with the same bandwidth and time of day and other settings, just a shift of the loop to point http://abelian.org/vlf/tmp/160414b.gif Uwe is 1.7 dB stronger and the noise was lower
I made a mistake with the signal strengths. When combining E-field and H-field to maximise the S/N I have to remember to divide the strength by two. I forget to divide by two when measuring DJ8WX and
DK7FC one hour averages in 278uHz, stepping 30 minutes. Flux density and phase lead, by start time. 2016-04-16_22:00:00 0.13 fT 141.8 deg 2016-04-16_22:30:00 0.10 fT 121.1 deg 2016-04-16_23:00:00 0.0
