Stefan, thanks for the carrier, this helped me improve my grabber a bit.
i've changed the time range in my grabber to 7 days, so that you can
compare with your previous carrier, and also added a "normalised"
spectrogram:
https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-4-8270hz/
in the normalised spectrogram the average of relative powers for each
timeperiod are normalised to a constant value. so this is something
similar to AGC, taking care of day/night noise variations. i think Paul
does something similat, because his spectrogram doesn't show differences
in day/night noisefloor.
the S/N isn't great, but this is from a simple e-field antenna in the
middle of the city.
i've also added a 6470Hz grabber for your next tests (and will add 5170Hz
and normalized graphs in the future):
https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-sq5bpf-6470hz/
VY 73
Jacek / SQ5BPF
On Thu, 28 Sep 2017, DK7FC wrote:
Date: Thu, 28 Sep 2017 22:32:22 +0200
From: DK7FC <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: VLF: 300 mA on 8270 Hz
Hi Markus, Jacek, VLF,
OK, the carrier is running since 19:35 UTC on 8270.005 Hz and will run until
6 UTC, when the next (3rd) sequence of the 100 character message begins.
Good to know there is some interest. BTW Mike/G3XDV has successfully detected
the recent carrier. He sent me a spectrogram a few days ago. It sound like he
is building up his VLF equipment.
BTW we need more TX stations i would say. I don't know how long i can hold
this station here. Times may change... But it would be great to do a kite
experiment anyway, even with just a 100m vertical :-)
Good luck.
73, Stefan
Am 28.09.2017 21:47, schrieb Jacek Lipkowski:
On Thu, 28 Sep 2017, Markus Vester wrote:
before QSY, could you perhaps also leave the 8270.005 Hz carrier on air
overnight? This would give
Bernd DF9RB a chance to test his RX in a 31 uHz spectrogram.
and i'm sure others will benefit too, especially with a very long carrier
Marcin SQ2BXI has a grabber here (just turned on, so no signal yet):
https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-vlf-sq2bxi/
this would be our first chance to test it.
i have a grabber here:
https://klubnl.pl/wpr/en/index.php/klubnl-pl-grabbers/grabber-4-8270hz/
so for it has only been tested once.
and there's probably a few other stations lurking, waiting for confirmation
that their setup works. ebnaut is great, but nothing beats a carrier for
visual indication that everything is ok
VY 73
Jacek / SQ5BPF
grabber_8270.png
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grabber_8270_normalised.png
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