Re: Aw: LF: strange signal at 73kHz

["Markus Vester" <markusvester@aol.com>]

Gary, Henny, Laura,

 

similar effect have happened occasionally on other VLF MSK signals, like DHO and GBZ. Sometimes the encrypted pseudo-random modulation is being temporarily replaced by simple periodic patterns, exhibiting sharp discrete lines rather than the usual diffuse noise-like spectrum. The unusual brightness in a narrow spectrogram is only due to the fact that the emitted power is then concentrated in very few spectral bins.

 

Best 73,

Markus (DF6NM)

From: Gary - G4WGT

Sent: Tuesday, November 12, 2013 8:57 PM

To: rsgb_lf_group@blacksheep.org

Subject: Re: Aw: LF: strange signal at 73kHz

Hi Laura,

The captures are from today, 12/11/2013.
The time is shown on my capture as utc between 1000 & 1200utc.

My location is England IO83qo & Henny's is Netherlands JO22md.
Quite a long way apart to be a locally generated signal.

I note that Henny's time stamp is 1 hour different, probably using local time.

73, Gary - G4WGT



On 12/11/2013 19:41, LZ wrote:

Hi Gary,

 

Nothing from Sheffield (!) and Budapest at that time.

Please, could you specify locations and time zones of those

captures (utc, CET or else)?

 

Indeed such strong signals happend occasionally down there.

It's common sense that these "superpulses" are of local origin

from induction cookers observed around local noon and early

evening only. But who knows - correlation is not causality at all.

 

Laura

Geschreibt von meine CausaFone

 

Can anyone explain this wideband signal around 19.800kHz captured by
Henny (PA3CPM) & myself

https://www.dropbox.com/s/led5muaprfu9gja/NWC-1311121200.jpg

 

https://www.dropbox.com/s/mvi07pz0jxfkrdb/capt04.jpg

It also can be seen, bottom grab on my grabber at :-

http://myweb.tiscali.co.uk/wgtaylor/grabber2.html

73, Gary - G4WGT.
 

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