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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*LF\:\s+Re\:\s+ferrite\s+coil\s+\-\s+extended\s+range\s+variometer\s*$/: 2 ]

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1. LF: Re: ferrite coil - extended range variometer (score: 1): Author: "James Moritz" <[email protected]>; Date: Wed, 17 Aug 2011 21:37:42 +0100; Dear Mal, Gary, LF Group, ...and in their tunable RF amplifiers, etc., but as far as I am aware they did not make permeability tuned ferrite rod antennas... perhaps there is a Collins equipment exper; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-08/msg00000.html (14,967 bytes)
2. Re: LF: Re: ferrite coil - extended range variometer (score: 1): Author: "Graham" <[email protected]>; Date: Wed, 17 Aug 2011 22:06:44 +0100; Jim Marconi Marine used two (app) 4 inch X 1.5 inch ferrite discs bolted inside the rotating inductor of the variometer , using machined tufnol bolts and nuts of course ! in the Ocean-span Tx , 3 X 8; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-08/msg00135.html (14,265 bytes)

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