Re: VLF: First VLF detection DL > EA

[DK7FC <selberdenken@posteo.de>]

Hi Paul, VLF,

Thanks.

I think we will have a good chance to transfer a message over that path. 
We will try that soon.
Yesterday the TX went off the air in the afternoon and it was off during 
the night.
Now it is on air again since 15:12 UTC, after playing a bit in DFCW-90, 
see the capture from the DL0AO grabber :-)
That's a challenge: Try to display that DFCW-message. Can you read it on 
your side?
I prepared a modified band filter which is in front of the noise 
blanker, see the other attachment. Since we have to deal with JXN/16.4 
kHz and HWU/18.3 kHz inside the 3 kHz band filter, it may be helpful to 
notch them out. This can be done manually (by hand) in SpecLab. You can 
see the result in the spectrogram obove. You can even see that the 
sferics are better rejected after lowering the MSK transmitter peaks...
73, Stefan

Am 03.12.2017 17:02, schrieb Paul Nicholson:
> I've added this to the ever-growing list of VLF
> milestones that I keep at
>
>  http://abelian.org/vlf/amateur-radio/
>
> Well done to Luis for this success in what seems to be
> quite a difficult band.
>
> --
> Paul Nicholson
> --

Special filter.jpg
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capture at DL0AO.jpg
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