Message-ID: <B333AB0EF6D4D4118BAF00508BAED8EA088D9ECA@mms12014.stv.uk.astrium.corp>
From: "OSBORN, Chris" <Chris.OSBORN@astrium.eads.net>
To: "LF Group (E-mail)" <rsgb_lf_group@blacksheep.org>
Date: Wed, 17 Nov 2004 09:19:08 -0000
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Subject: LF: Loading Coils
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	Hello LF Group

	Many thanks for all comments and advice - most interesting.

	I drilled out the wooden dowels on the loading coil and replaced
them with lengths of 15 mm plastic water pipe.
	I was unable to obtain plastic rod at short notice and my XYL
wouldn't let me have her knitting needles !
	The pipe was not really rigid enough and bent slightly but was
sufficient to prove the experiment.
	With this new arrangement I obtained my personal best Q of about
250..

	Placing the new coil in the aerial circuit made a slight improvement
to the aerial current - from about 1.2 A to 1.5 A
	I would have thought that as most of the losses were in the coil a
bigger current improvement would have been achieved.

	I share my office with some young electronics engineers and was
surprised that they know very little about RF inductors or Q factor.
	It must be a dying art !

	My next improvement will be to raise the 'droopy' end of my aerial,
presently at a height of about 5 metres
	Unfortunately two neighbours' telephone wires pass over my garden
where the mast was to be situated.
	Any suggestions - should I go over the wires or keep well clear of
them and cut a length off the aerial ?
	Presumably I can't get the phone company to move their wires !!

	73 Chris G3XIZ

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