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RE: VLF: DK7FC close to SAQ

To: "[email protected]" <[email protected]>
Subject: RE: VLF: DK7FC close to SAQ
From: VIGILANT Luis Fernández <[email protected]>
Date: Wed, 29 Nov 2017 11:20:02 +0000
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Thread-topic: VLF: DK7FC close to SAQ



Got some pixels at the right place in the 47uHz spectrogram at 100 minutes per pixel

The 179uHz spectrogram at the end of the page is also showing something. But a lot of imagination is needed

linking the pixels with a line and discovering Stefan’s constellation  ;-)


73 de Luis



De: [email protected] [mailto:[email protected]] En nombre de Markus Vester
Enviado el: miércoles, 29 de noviembre de 2017 11:11
Para: [email protected]
Asunto: Re: VLF: DK7FC close to SAQ


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,

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
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:

Excellent activity!

73, Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 26. Nov 2017 0:42
Betreff: VLF: DK7FC close to SAQ


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:,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

73, Stefan

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

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