Thank you Alan, Markus, Henny, Jean-Pierre, Jay,
It took a while until i belived that this is/was possible. Thank you
for the confirmations. I was sceptic if the LF world would call this a
valid detection. Now i hope to get better results and a even better
proof today.
David/VK2DDI who runs the well known Berry Mountain Grabber will watch
out too,
http://www.users.on.net/~davroz/vk6di/argocaptures/argocaptures.html.
He receives in a low noise location...
Not sure who of them is (still) member of this reflector so i put them
in CC.
Due to Markus' work i see now that it actually may be possible to
receive a full call, if the path is open and QSB is low. In Dimitris'
DCF plot there is a peak of DCF to the time of my sunset and a stronger
one to the time of his sunrise. Inbetween this is the time when i will
be QRV. So i will start arround 17:30 UTC up to 20:30 UTC.
Exciting times again on LF :-)
73, Stefan/DK7FC
PS: I want to note that this 16464 km distant signal was received in an
urban location with a "micro probe" active E field antenna designed by
PA0RDT, not a large inv-L! ;-)
Am 15.03.2012 10:07, schrieb Markus Vester:
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?
LF,
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 ( http://people.physics.anu.edu.au/~dxt103/grabber/)
showed this spectrogram at about 20:10 UTC:
http://dl.dropbox.com/u/19882028/LF/is%20that%20a%207.jpg
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
minutes.
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
http://dl.dropbox.com/u/19882028/LF/EU60.jpg
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:
http://dl.dropbox.com/u/19882028/LF/7%20comparison.png
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 :-)
http://no.nonsense.ee/qthmap/?qth=JN49IK00WD&from=QF44MT
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: http://people.physics.anu.edu.au/~dxt103/grabber/
>
> 73, Stefan/DK7FC
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