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RE: VLF: DK7FC close to SAQ

To: <[email protected]>
Subject: RE: VLF: DK7FC close to SAQ
From: "Dave " <[email protected]>
Date: Tue, 28 Nov 2017 10:58:26 -0000
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What antenna and RX are you using for VLF, Eddie?


73, Dave G3WCB IO80EI


From: [email protected] [mailto:[email protected]] On Behalf Of g3zjo
Sent: 28 November 2017 10:49
To: [email protected]
Subject: Re: VLF: DK7FC close to SAQ


Left it on overnight.

Would you like it on 24/7, I see diurnal variations similar to Marcus but more pronounced due to my lower signal strength.

73 Eddie


On 27/11/2017 20:30, g3zjo wrote:

Hi Stefan

I didn't quite believe what I was reading you may like to take a look at my Grabber.

73 Eddie


On 27/11/2017 09:34, DK7FC wrote:

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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