Hi VLF, It took much longer than expected. Maybe 2/3 of the winter season is over now. Time to finally go the next step down to DC, another episode of the series "300 mA on..." :-) Since 22:15 UTC a
A nice signal at Bielefeld, S/N 23dB in 55 uHz. Also 14.3 dB at Cumiana in 49 uHz. And 15.4 dB/49uHz in Todmorden. No sign of the signal yet at Warsaw in 49 uHz. -- Paul Nicholson --
Thanks for the first overview. A very nice signal in Bielefeld indeed. Also the RX site at DL0AO shows the signal with a very good SNR in 424 uHz, http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber
I'm unable to see any significant signal at Warsaw via the vorbis live stream. There's a spike at 4470.1 but it is not significant against the noise, even in 8 hours (34.7 uHz). Perhaps Jacek will ha
Unintentionally the message was sent with 30 second symbols this night. Tomorrow it will start as intended... Am 17.01.2018 23:21, schrieb DK7FC: f = 4470.100000 Hz Start time: 18.JAN.2018 16:00:00
Good copy in Todmorden. Based on last night's carrier, the signal calculated predicted Eb/N0 would be +3.5 dB, and I got a decode at +3.8 dB. A distance record for message decode at the 67km band. Bi
Hello Paul, Very nice! Thank you for the reports. If you got +3.8 dB from that message, then we can expect up to 10 characters per night between us (using twice as long symbols and start/stop times o
Thanks Markus. It is also a very good signal on your side. BTW when i run the 12 char message with a list length of 2E6 on my Linux PC, it takes about 3 hours to complete a full scan. But it doesn't
Perhaps. At this frequency I have the same problem with H S/N as at 5170. Eg, your overnight carrier in 31uHz: E: S/N 16.6 dB; H: S/N 11.0 dB; E + H: S/N 15.1 dB; The E and H amplitudes agree well,
Am 19.01.2018 13:58, schrieb Paul Nicholson: The low S/N on H is caused by high noise floor. Recently i thought about that... You told us that you are climbing regularly. So there seems to be a mount
The location here is bad for VLF, so many power lines. If I posted a sample of the raw signal from the antennas, you would be horrified and wonder how anything could be received through that. I have
FFT -> excise hum lines -> IFFT, before blanking? Jim AA5BW The location here is bad for VLF, so many power lines. If I posted a sample of the raw signal from the antennas, you would be horrified and
Getting uplink now from Warsaw but it was a bit intermittent. Unfortunately signal levels are down a few dB last night so no decode at Warsaw. Maybe Jacek can decode the 20/21 from local storage? vtr
Hello Paul, Thanks again for the recent summaries. Am 21.01.2018 13:31, schrieb Paul Nicholson: The average S/N so far at this frequency is distinctly better than at 5170 Hz. Todmorden: 5170 Hz -28.1
Many thanks Paul. Jacek will now have enough data on his storage to produce a decode on his side. Hopefully he finds the time :-) Well, after having 5 nights to analyse from the files kindly provided
