Hi Paul, VLF,
That's amazing! I like the 4 uHz peak :-) 18.22 dB in such a small
bandwidth, that tell's something about TX and RX stability but also
about the path stability. No defeat at all.
The (unblanked!!) QRN looks incredibly strong but i find it interesting
to try in such condx.
If you are ready for a next transmission, i would start one in a few hours.
Maybe 300s symbols and 13 chars? Takes just 74 hours! :-)
73, Stefan
Am 04.06.2016 18:57, schrieb Paul Nicholson:
Stefan wrote:
> Message 22.05.2016: 'cqcq dk7fc in jn49ik'
18.22 dB in 4.06 uHz,
http://abelian.org/vlf/tmp/160604a.gif
which gives Eb/N0 = -2.35 dB on the 20 char message
> Message 25.05.2016: 'not very easy'
16.24 dB in 7.97 uHz,
http://abelian.org/vlf/tmp/160604b.gif
and Eb/N0 = -2.46 dB.
Seems we are close with both messages, just needs another dB
to have a chance of decoding and another 2dB would make
decode very likely.
These must be amongst the narrowest bandwidth detections anyone
has used. The day/night phase shift doesn't seem to be causing
us any problem. But, I wonder if I could gain another dB by
adjusting for a nominal diurnal. I can use these recordings to
try that.
--
Paul Nicholson
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