Re: LF: What freq. list can you recommend

[Stefan Schäfer <schaefer@iup.uni-heidelberg.de>]

Hi Daniele,

Yes i could do that but sometimes there are problems when remote controlling the VLF grabber PC since there are 10 SL instances running, the limit for that CPU. So maybe tomorrow (i'm not in Heidelberg in the moment).
Maybe it's worth to check if the traces at 8 / 16 kHz disappear when the sampling rate is changed, say to 44100 Hz or so.

73, Stefan

Am 25.01.2011 14:10, schrieb Daniele Tincani:

Hello Stefan,

 

currently the 0-24KHz window in your grabber shows one of these traces close to 8KHz (circled in yellow in the attached JPEG).

Could it be possible for you to read its frequency, more precisely?

 

Regards

Daniele

---

From: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Tue, January 25, 2011 1:48:26 PM
Subject: Re: LF: What freq. list can you recommend

Hello Jürgen,

Welcome to the group!
About 16 kHz: Sometimes there appear traces at 16 kHz as well as on 8 kHz but these may be signals caused by some alias effects in the soundcard, sampling at 48 or 96 kS/s and/or caused by NAA/24 kHz. I am receiving these traces too, see the lower capture on http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html and ignore the 600 Hz spaced QRM lines, caused by the Heidelbergs's tram SMPS...

BTW, it would be interesting to see a 0...24 kHz capture of your RX antenna, covering one day.

Further interesting VLF grabbers in wider distance:
http://qsl.net/4x1rf/vlf/vlfgrabber.htm
http://simnet.is/halldorgudmunds/
http://kl7uk.com/VLFAlaska.html

73, Stefan/DK7FC

73, Stefan/DK7FC

Am 24.01.2011 20:50, schrieb James Moritz:
> Dear Jurgen, LF Group,
>
>
> You wrote:
>> - a weak 16,0kHz CW that is slowly being keyed.
> According to the above list that should be from UK, but its level is too low,
> unles they use low power...>
>
> The info in the VLF utilities listings tends to be rather old - a lot of the frequencies listed as being allocated are no longer in regular use. 15.98kHz was the old frequency of Rugby Radio, GBR, which was decomissioned several years ago. The replacement VLF stations at Anthorn and Skelton could probably in theory transmit on that frequency, but in practice they do not...
>
>
> Cheers, Jim Moritz
> 73 de M0BMU