Re: VLF: DK7FC close to SAQ

[Markus Vester <markusvester@aol.com>]

Attached is a plot from the DL0AO cardioid, showing yesterday's diurnal amplitude and phase changes. Good traces are also continuously visible on the G3ZJO and DF6NM VLF-grabbers. Hope that someone from America or Russia may also be attempting to pick up the signal.

Best 73,
Markus


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 27. Nov 2017 10:37
Betreff: Re: VLF: DK7FC close to SAQ

Hello Markus,

thanks for the feedback. Wonderful, now it is 30 dB in 424 uHz. DL0AO could run a 3.8 mHz '600' RDF spectrogram and a phase and signal level plot, so we could see propagation effects much better.
You could already see QRSS-60 from me! I will try that soon.
The carrier is still on the air. It will run the whole day and night...

73, Stefan

Am 26.11.2017 15:59, schrieb Markus Vester:

Yeah it's there! More than 20 dB SNR at DL0AO: http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm

Excellent activity!

73, Markus (DF6NM)


-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: So, 26. Nov 2017 0:42
Betreff: VLF: DK7FC close to SAQ

Hi VLF,

Since 23 UTC a 700 mA carrier is running on 17.4701 kHz!

It is a little surprise to the VLF community i think ;-)

Legal? Yes: http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/17,47kHz_Sonderlizenz.jpg
Actually the document has 3 pages but the other ones are no so relevant.
My ERP is limited to 5 mW. I did not request more because more isn't possible anyway with this antenna.

I wound a big single layer coil with 0.5 mm enameled wire on a PVC tube with 315 mm outher diameter.

0.7 A is just a first careful step. The coil is designed to hold 1.5 A 'key down'.

The carrier will run the whole night and even tomorrow at daytime.

Worldwide reports are welcome ;-)

It is not sub-9-kHz but still VLF, the 17 km band!! So give it chance :-)

The tree has still some solar power to stream the signal from the EW loop down to the city, so there is a feedback spectrogram at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html


73, Stefan

PS: I still can hear that tone of the coil. It is terrible! Be happy when you are older than me!

vlf12a_171129_0014.png
Description: PNG image