Alan !
Thank for your reply. I don't mind you to post this picture wherever you
like. It would be interesting for me to get a clue where it could come
from and to know, where to search for it.
73 es gl
OE3GHB
Gerhard
Am Montag, den 27.09.2010, 20:22 +0100 schrieb Alan Melia:
> Hi Gerhard well those a pretty :-)) and very like space invaders! I have
> never seen anything quite like that. I would suggest they are an effect from
> a local source. If you dont mind I would like to throw that plot at the VLF
> group who are quite knowledgable about manmade sources. Renato Romero has
> done a lot of detective work to pin some of those kind of strange effects
> down at below 24kHz.
>
> They seem too regular for "motor-starts" but could possibly be the
> harmonics of something like that locally. You will have to quiz the local
> "Home Improver" hobbists as to when they have been using their drills :-))
> or rush outdoors and see if you can hear any sound lasting around minute (I
> think that is the duration.)
>
> Alan G3NYK
>
> ----- Original Message -----
> From: "Gerhard Hickl" <[email protected]>
> To: <[email protected]>
> Sent: Monday, September 27, 2010 6:13 PM
> Subject: LF: Aliens on LF !
>
>
> > Hello Group!
> >
> > Has anybody an explanation for the kind of signals displayed on my
> > grabber sometimes?
> >
> > They appear not periodically but rather random but always around 137720.
> > I noticed them first a few month ago in spring.
> >
> > I think it is caused by an electrically device locally but which kind of
> > stuff could do this signal?
> >
> > Any ideas?
> >
> > 73 es gl
> >
> > OE3GHB
> > Gerhard
> >
> >
>
>
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