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Re: ULF: EbNaut message transmitted from ground loop

To: [email protected]
Subject: Re: ULF: EbNaut message transmitted from ground loop
From: DK7FC <[email protected]>
Date: Fri, 12 Apr 2019 09:25:16 +0200
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Hi Jacek,

For future tests it would be useful to have a grabber window on your side, showing 1...3 kHz in one spectrogram. It would be just to see how and when the QRN/M starts and when it has its minimum at night. Can you set up something like that? And what about Marcin? Maybe you can build up a RX site at his QTH. Close to the sea, it may be a bit quieter than in the city(?). And if he has a garden, there may be a place with a clean ground...
73, Stefan


Am 11.04.2019 22:44, schrieb DK7FC:
Hi Jacek, ULF,

That's great! Amazing! 976 km distance in the ULF range!
A decode at 15.63 dB carrier S/N.
Can you describe your RX antenna and location/position of it?

Thank you for your work! I will try to use your parameters and then we see the digital loss of the vorbis path. It is a good set of data to 'play' with, because this distance/frequency/mode has never been done by radio amateurs before.
A first detection/decode DL > SP.

Eventually i'll do more experiments this weekend. Let's hope for a suitable wx. The last days have not been really quiet ;-)
And BTW, when is your next transmission together with Marcin?

Another thing: Sometimes i git better results when using vtfilter -h lp... -h hp... instead of vtfilter -h bp... because the edges are a bit smoother. Also it can improve the SNR to place the center frequency of the filter not to the TX frequ ency but some 100 Hz up or down, depending on the noise distribution.
73, Stefan

PS: I remember you asked a few times if i can go lower than 5170 Hz. Now we are there :-)





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