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Date: Thu, 09 Mar 2006 11:40:55 +0100
From: "John RABSON" <john.rabson@wanadoo.fr>
To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Rugby test?
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Peter,

Cave radio people have for some time been wondering about the origin of the=
 Galloping Horses effect.  I believe the term was coined by Jean-Jacques=
 Fauchez, F6IDE, but he is now a Silent Key we cannot ask him.

May we reprint your explanation as a Letter to the Editor in our next=
 issue, please?  I would of course send you a copy of the text beforehand=
 for you to agree the contents.

73,
John Rabson F/G3PAI
Commissioning Editor
Cave Radio & Electronics Group Journal

*********** REPLY SEPARATOR  ***********

On 08/03/2006 at 09:45 Peter Martinez wrote:

>>From G3PLX:
>
>It wasn't Rugby that went off yesterday but Lessay. As luck would have it
>I 
>was trying to debug some LORAN receive software that morning, and I
>couldn't 
>figure out why it wouldn't work. It seemed to work in the afternoon and I 
>couldn't figure that out either until the screenshot from Markus revealed 
>all!  The moral must be - don't try to debug LF receive software on the 
>first Tuesday of the month!
>
>Rugby transmits a regular group of 8 pulses at 14.85/sec., and on it's own=
 
>that would give a very regular buzz, although at a rather lower rate than
>a 
>fluorescent light. When Lessay is on, it transmits both at 14.85/sec and 
>13.11/sec and the 1.5Hz beat between these gives the galloping effect.
>
>With Lessay off, the galloping stops. At least this is true in the UK.
>
>73
>Peter