From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <281222.921.qm@web26004.mail.ukl.yahoo.com> <001301c901e6$917c2d30$2201a8c0@PC2> <731EB49F88B309428FFDDD2423F810E441C128@HERMES4.ds.leeds.ac.uk>
Date: Tue, 19 Aug 2008 12:53:32 +0100
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Subject: LF: RE: NAVTEX interference
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Hi LF,

I have noticed a strange occurrence when looking back at my extended
frequency range of captures.

In most of the interfering periods the strongest signal has not, I repeat -
HAS NOT been at 518 KHz. Yes a 518 KHz signal has been present quite weak
but amongst the splatter the spurious signals on 514.5 & 513 KHz have been
very strong along with a very strong un-modulated signal on 516.525 KHz.

There have also been five similar spurious but weaker signals radiating into
the 500 KHz band but originating from a lower frequency than my SDR Rx can
is monitor. ie, lower than 489 KHz.

I am keeping all the captures & will continue to monitor & capture until the
problem is resolved.

Regards,

Gary - G4WGT.
 

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Chris Trayner
Sent: 19 August 2008 11:48
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: Re: NAVTEX interference


> Perhaps  you can contact with the MCA ( Maritime and Coastguard Agency); 

And/or Ofcom (the UK licencing agency)? 
Might be worth attaching one of the spectra that have been circulated on
this list, plus some of the other supporting details.


73,
Chris G4OKW

-----------------------------
Dr Chris Trayner
School of Electronic & Electrical Engineering,
The University of Leeds,
Leeds LS2 9JT, United Kingdom
Tel: +44 113 34 32053
Fax: +44 113 34 32032