Date: Fri, 15 Feb 2019 11:11:03 +0100 (CET)
From: Jacek Lipkowski <sq5bpf@lipkowski.org>
To: rsgb_lf_group@blacksheep.org
In-Reply-To: <5C6673B0.8040106@posteo.de>
Message-ID: <alpine.DEB.2.11.1902151102580.22616@mailn.lipkowski.org>
References: <5C656A8F.70702@gmx.de> <a592f294-4393-7ae0-4a35-0fb2c91c9620@mvnet.de> <5C65B7F5.6060608@posteo.de> <b68225a3-20a3-2c4f-ff0d-7eb19867a32b@mvnet.de> <5C6673B0.8040106@posteo.de>
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Subject: Re: LF: Question: QRM on 630m.
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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 <selberdenken@posteo.de>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: rsgb_lf_group@blacksheep.org
> 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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