Hi Markus,
Nice work! I can see you in 424 uHz, and traces in 4.5 mHz. You leave a
strong trace in 47 uHz, at exactly 8970.0020 Hz! Very nice.
I can see QSB on your signal in that 174 km distance.
What is the ERP?
Go on! :-)
73, Stefan/DK7FC
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html
PS: Lubos, really an excellent Grabber!!
Am 28.03.2012 09:08, schrieb Chris Dillon:
Hi Markus
Good signals here too in 424uHz and 125uHz (peaking 10dB over the
noise) alongside Henny and Uwe.
Nice to see VLF busy!
73 Chris G3WCD
On 28/03/2012 07:50, Markus Vester wrote:
The carrier was on air continuously from 20:26 to 6:36 this
morning.
Thanks very much to Lubos, as well as to all other live
grabber operators. As far as I can see, traces appeared at DK7FC,
G3ZJO, OK2BVG, and Paul Nicholson.
Best 73,
Markus
-----Ursprüngliche
Mitteilung-----
Von: Lubos OK2BVG <[email protected]>
An: _RSGB_LF <[email protected]>
Verschickt: Mi, 28 Mrz 2012 4:24 am
Betreff: RE: VLF: DF6NM on 8970.002
Hello Markus, VLF!
Your signal is nice visible on my grabber in QRSS6000 and
traces in QRSS600. In the 6000 window is evident, that we did our VLF
QSO in time, when the noise conditions were not the best.
I have written an article about our qso in Czech. It will be
publised in a ham magazine "Radioamater", common known in The Czech and
Slovak republic. Some hams would be encouraged to find VLF band by the
report. :-)
73!
Lubos, OK2BVG
To: [email protected]
From: [email protected]
Date: Tue, 27 Mar 2012 17:22:42 -0400
Subject: VLF: DF6NM on 8970.002
It's a beautiful night! At 20:25, I have started up a straight
carrier on 8970.002 Hz (DHO locked). If all stays well I will leave it
on until after sunrise.
An interesting observation on the side: In the first few
minutes, I drove the amp up to 400 mA antenna current. A little corona
became visible near the ends of two of the three topload wires - it
wasn't very bright, not unlike 3rd magnitude stars when viewed from the
ground 10 m below. But the 9 kHz sound from antenna itself could be
heard quite loudly, which is a potential cause for neighbourhood
trouble.
Then I reduced the drive to 350 mA where the corona
disappeared completely. So did the noise, the antenna became absolutely
quiet! All that was left was a little noise from the coil in the
dustbin on the balcony, and the transformer indoors. Thus the
predominant cause for a squeaking antenna must be corona. The fact that
it can be heard at 9 rather than 18 kHz demonstrates that the discharge
must have an asymmetric dependence on the voltage polarity.
At the same time, wideband electrical noise on the nearby LF
grabber antenna went down by 20 dB.
BTW If you like you can actually read my VLF frequency
from an alias line on the LF TA grabber: It is created by the 24th VLF
harmonic, intermodulating with DCF 77, thus appearing on 24 x 8970.002
- 77500 = 137780.048 Hz.
Best regards,
Markus (DF6NM)
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