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Re: Inductor question



On Sat, 7 Sep 1996 16:25:41 -0600, Tesla List
<tesla-at-poodle.pupman-dot-com>, you wrote:

>>From ed-at-alumni.caltech.eduSat Sep  7 15:25:51 1996
>Date: Fri, 6 Sep 1996 19:33:05 -0700 (PDT)
>From: "Edward V. Phillips" <ed-at-alumni.caltech.edu>
>To: tesla-at-pupman-dot-com
>Subject: Re: Inductor question
>
>Steve:
>	Your results sound pretty reasonable.  If you will look
>up a recent copy of the ARRL Antenna Handbook you will find curves
>showing how the inductance of a ferrite-cored loop varies with
>the length to diameter ratio.  For very long, skinny coils full
>of high-permeability material you get quite an inductance change,
>while for short, fat coils the change is much less because a large
>part of the flux path is through air.
>Ed Phillips
>
All,							Iron/Air core
---------------------------------------------------------------------
	Steve's 13" by 4" single layer of #4 		5:1

	Mike's  ??  by 3" bunch of #10			3:1

	Richard Quick 20 turns of #4 on 6"		??

	Jim's   12" by 2 3/8" double layer of ~17 	28:1

Would any one else like to try a double layer? I looks like it
concentrates the flux better.

	jim