LF: Re: DK7FC in VK?

["mal hamilton" <g3kevmal@talktalk.net>]

Well I can see a short trace on 136.173 at 1900 utc approx on the vk2ddi grabber. Could be anything of course !!

g3kev

 

 

From: Stefan Schäfer

Sent: Thursday, March 15, 2012 2:01 PM

To: rsgb_lf_group@blacksheep.org

Cc: Dimitrios Tsifakis ; David - VK2DDI ; Steve - VK2XV

Subject: Re: LF: DK7FC in VK?

 

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 mailto:Stefan.Schaefer@iup.uni-heidelberg.de
An: rsgb_lf_group mailto:rsgb_lf_group@blacksheep.org
Cc: Gamal Wahid Soegiono mailto:soegiono@web.de
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