RE: VLF: strange transmissions

[Lubos OK2BVG <bvgbob@hotmail.com>]

Hello Stefan, Markus, VLF!

I argee with Markus. I think, it was RDSN-20 transmitting. The RDSN system had been turn off some days ago and than tested, may be.

73!

Lubos, OK2BVG

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To: rsgb_lf_group@blacksheep.org
From: markusvester@aol.com
Date: Mon, 1 Aug 2011 08:29:05 -0400
Subject: Re: VLF: strange transmissions

Hi Stefan,

 

three of the frequencies seem to be the alternate frequency set of the Alpha (RSDN 20) navaids, mentioned on

http://www.vlf.it/alphatrond/alpha.htm

 

F6  12500.00000  Hz = 16 x 781.25 Hz

F7  13281.25000  Hz = 17 x 781.25 Hz

F8  15625.00000  Hz = 20 x 781.25 Hz

 

There also seems to be another one somewhere around 12.75 kHz.

Best regards,

Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo., 1. Aug. 2011, 12:55
Betreff: VLF: strange transmissions

VLF,

There are strange transmissions near 12.4, 13.3 and 15.6 kHz, narrow 
band, very strong here in Heidelberg 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html and 
also in Iceland 
http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/index.html, also very 
clear at http://www.ok2bvg.cz/vlfgrabber/ and others.

Does anybody know what it is? Looks different to the often seen 
staircases during transmitter tests...

Unfortunately many VLF grabbers are paused / OFF these times...

73, Stefan/DK7FC