if it's drifting, then it might drift onto an NDB frequency. and that
would be an aviation hazard.
look for local NDB's near this frequency. if none is found, then maybe you
could say that it might drift to NPR (488kHz, Airport at Tomaszow
Mazowiecki). if BNetzA needs to have a reason to investigate, then maybe
the possibility of interference to a foreign airport might be enough
VY 73
Jacek / SQ5BPF
On Fri, 15 Feb 2019, DK7FC wrote:
Date: Fri, 15 Feb 2019 09:09:20 +0100
From: DK7FC <[email protected]>
Reply-To: [email protected]
To: [email protected]
Subject: Re: LF: Question: QRM on 630m.
Hello Eberhard,
RR. And who is 'we'?
Once you found the source you may also find someone living close to it. If the
source makes QRM on other frequencies
too, affecting broadcast reception, then he could tell it the BNetzA. Probably
they will ignore it if you say that
it's disturbing the 630m band.
It must be something that is able to radiate a decent power at MF. It is barely
audible here. So it can't be a
compact structure.
Good luck.
73, Stefan
Am 15.02.2019 08:47, schrieb eberhardvwedelstaedt:
Hallo Stefan
The drifting signal whith center at 474,4kHz whith sidebands 50Hz ist
since 4 or 5 Years permanent
365/7/24.
I think it is a advertising plant or a neon sign in the geographical
triangle hamburg kiel cuxhaven. we
want to make it more accurate in the spring.
73 Eberhard DL3ZID
____________________________________________________________________________________________________________________
Am 14.02.19 um 19:48 schrieb DK7FC:
Hello Eberhad,
Interesting. BTW there is a QRM source that is there since years, almost
every night, a drifting
signal arround 474.3...474.5 kHz. I saw it on your grabber as well, so i
cannot be local!
You can see it right now, e.g. at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_remote_RDF_Grabber.html
It is only visible at night, at least here. So it seems to be > 300 km
distant. If my colours are
more or less accurate then it comes from the north.
Do you know what it is?
73, Stefan
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