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Re: LF: Re: DK7FC close to SAQ

To: [email protected]
Subject: Re: LF: Re: DK7FC close to SAQ
From: DK7FC <[email protected]>
Date: Sun, 26 Nov 2017 12:19:11 +0100
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Hello Luis,

thank you for the grabber window :-)
I think you need to use something between 424 and 47 uHz to have a chance to see something. But actually i have no idea. It is a new band and maybe propagation is different than expected.
At least, from the radiation resistance, the ERP is 6.5 dB higher relative to 8.27 kHz and will be another 6 dB higher soon...

73, Stefan


Am 26.11.2017 10:52, schrieb VIGILANT Luis Fernández:
Hi VLF

Grande Stefan !!!!

Unfortunately have just read your email. This is amazing. I have just set my last window at my grabber

Thoght that this Christmas we would have no SAQ, but then you fixed that ! hi hi

73 de Luis
EA5DOM 


De: [email protected] [[email protected]] en nombre de DK7FC [[email protected]]
Enviado: domingo, 26 de noviembre de 2017 0:40
Para: [email protected]
Asunto: 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!
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