Hi ULF,
The first EbNaut message was decoded over a distance farer than 1
wavelength on the 101 km band. Just a single character which
quickly decoded at a high SNR. This was despite the very high night
QRN. It is the message that was sent between 0...1 UTC on Sunday, 22th
of January 2017. The message 'F' was sent 3 times inbetween the gap of
the DFCW-10800 message 'F'. This shows another time the power of EbNaut.
The postprocessing is still running. On the links below you can see how
strong the QRN has been during that night transmission. There is a
noise background difference between day and night of > 20 dB, even
in this time of the year. Oh and it shows how deaf my tree grabber is
on 2970 Hz (and below).
The other message which was transmitted at 20...21 UTC suffers from
even higher QRN (see the 424NMEA spectrogram). It produces multiple
decodes, mostly F but partly other characters, even though i used a 21
CRC bits.
In a few hours i can attempt to decode the 7 character message which
will decode at a very high SNR. I already know it because the
transmission is already visible in the 424 uHz spectrogram!
73, Stefan
Am 23.01.2017 16:06, schrieb DK7FC:
Hi ULF,
The postprocessing of my recording (0...12 kHz) from France is running.
The first pixel of the 424 uHz spectrogram just appeared. It shows a
peak on the right frequency having about 20 dB SNR! :-) See attachment.
The ongoing postprocessing can be followed at
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/wide140.jpg
and
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/424NMEA.jpg
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2nd message.png
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