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Date: Fri, 12 Apr 2019 09:25:16 +0200
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: ULF: EbNaut message transmitted from ground loop
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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 :-)
>
>