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Re: LF: Re[2]: LF: DK7FC in VK?

To: [email protected]
Subject: Re: LF: Re[2]: LF: DK7FC in VK?
From: Stefan Schäfer <[email protected]>
Date: Thu, 15 Mar 2012 19:44:16 +0100
Cc: Dimitrios Tsifakis <[email protected]>, David - VK2DDI <[email protected]>
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>
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Thanks to all for the nice words!

NOW: It comes through again:
Even earlier than yesterday. Looks promising for the next hour :-)))))))))))))))))))))))))))

73, Stefan/DK7FC

Am 15.03.2012 16:54, schrieb Alex K:
VY Congratulations Stefan, Dimitris!! UFB!
de rn3aus

15 марта 2012, 13:09 от Markus Vester <[email protected]>:
Wow! I'm red-hot with envy ;-)
Attached is another grabber screenshot comparison. The width from DK7FC was halved, and the timescale of VK1SV shifted by 28 minutes. In addition to the perfect "7", we also find earlier weak dashes on the low DFCW frequency, between 18:05 and 18:20. This matches what seems to be have been a transmit keying error, with the callsign ending early in an "F" rather than a "C".  
Congratulations to both Stefan and Dimitris on this fantastic result!
Best 73,
Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Stefan Schäfer <[email protected]>
An: rsgb_lf_group <[email protected]>
Cc: Gamal Wahid Soegiono <[email protected]>
Verschickt: Mi, 14 Mrz 2012 11:42 pm
Betreff: LF: DK7FC in VK?


Not yet a clear proof but probably i left a first trace in VK on 136.172 
kHz in my evening transmission a few hours ago.

The VK1SV grabber ( 
showed this spectrogram at about 20:10 UTC:

It looks pretty equal to a 7 i find.

Note the time delay of the time stamp in the spectrogram and in the text 
box in the left top corner. The correct time is that of the text box. 
(We don't know where this delay may come from). The delay is exactly 30 
So that 7 must have been on air at about 19:15 UTC. This exactly matches 
with my own grabber capture which can be seen at

Also the frequency matches as well as the DFCW element length and the 
DFCW shift of my DFCW-180 transmission. As a comparison i generated a 7 
in a spectrogram with equal setting as used by Dimitris/VK1SV. Then i 
cut that 7 and inserted it into the VK grabber capture, see:

Of course we will go on trying in the next time and hope to get a even 
better proof. In that mode there is little room, i.e. time to receive a 
complete call. The time is very limited. But maybe we will see a F 
tomorrow :-)
I'm very optimistic you know.

That is a path of 16464 km :-)

73, Stefan/DK7FC

PS: Will be quiet tonite due to VLF receive tests.

Am 14.03.2012 21:04, schrieb Stefan Schäfer:
> LF,
> I'm somewhat confused. Can somone look at this link and tell me what 
> he sees:
> 73, Stefan/DK7FC

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