DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=btinternet.com;
  h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status;
  b=w1u0tINLBgGEPSvpyXzFxQXfTG7RYeQRPh6ZIDpLhBQrGgapXpxgxR0cL/1fndu8R8FTOtUlLynZ/5Dd2XNSHkMIYvKOp4DvVWjcKE/U8df1W6LsVZfpAmyzsPXymYB5t3+RG4jJsRi7J5T+VAjjDz8B67eU0DqVXaK6VGBMEM8=  ;
Message-ID: <007b01cb7a91$ceb8df60$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <20101101233708.02b5f67d@opc1> <AANLkTi=chbDySSJR=D2_453gDhjwgxZ8D19xS=GOF5hE@mail.gmail.com>
Date: Tue, 2 Nov 2010 13:28:12 -0000
MIME-Version: 1.0
DomainKey-Status: good (testing) 
Subject: Re: LF: The Wideband Noise
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


Whoa hardly an intrusion we are not a primary user we have to take what
interference they give. Some seem to forget this is not an amateur band it
is commercial spectrum and we have an experimental permit. Also the noise
increase showed on your plot is minimal ~1dB .....speclab is extermenly
sensitive....what you are showing would probably be regarded as
insignificant.

I think this may be the French taking their normal stance of not wanting to
rely on US satellites and systems and trying to mollify
redundancy-threatened radio engineers :-))  cf  Loran-C. :

Alan

----- Original Message ----- 
From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, November 02, 2010 11:50 AM
Subject: Re: LF: The Wideband Noise


> Hi John & LF,
>
> The screen shot attached shows an average strength of the 498 to 502kHz
> signal here in NW England (IO83QO). QSB has an effect on the signal which
> continues throughout the darkness periods.
>
> This intrusion into the UK 500kHz band makes reception difficult.
>
> 73,
>
> Gary - G4WGT.
>
>
>
> On 1 November 2010 23:37, John P-G <gm4slv@sighthound.demon.co.uk> wrote:
>
> > Hello,
> >
> > I've had some correspondence with John G3WKL and Colin G3PSM about the
> > new "commercial" wideband data noise that occupies 498-502kHz
> >
> > It seems to be a test of an impending data system for marine use.
> >
> > Colin would like some information about where, and when, it can be
> > heard or otherwise detected. It appears to be being driven by the
> > French.
> >
> > Forthe record I can hear it here in Shetland. It faded up tonight at
> > approx 1615 UTC and is audible and visible on a waterfall display.
> >
> > I haven't been in a position to DF it, but in the first instance Colin
> > would like to gather some information about where it is being received.
> >
> > I can collate the information for him if anyone who is affected by, or
> > can simply detect, this noise/data signal could give details either
> > direct, or via the LF group. I know a lot of discussion has been had
> > already, but a quick note now could be useful, as there is a meeting
> > soon to discuss this, and other aspects of WRC2012.
> >
> > Cheers,
> >
> > John
> > GM4SLV
> >
> >
>