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Date: Thu, 09 Mar 2006 11:49:09 +0100
From: "John RABSON" <john.rabson@wanadoo.fr>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Rugby test?
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Sorry, I typed the wrong address.  This was meant to go direct to Peter.


John F/G3PAI

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

On 09/03/2006 at 11:40 John RABSON wrote:

>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