H/D Ratios

• To: tesla-at-poodle.pupman-dot-com
• Subject: H/D Ratios
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 12 May 1997 00:10:55 -0500
• Approved: tesla-at-stic-dot-net

Subject:       H/D Ratios
       Date:   Mon, 12 May 1997 10:38:15 +1200
       From:   "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization:  Wellington Polytechnic, NZ
         To:   tesla-at-pupman-dot-com


Hi all,
        Following some discussion on this recently, here are some 
theoretical findings which have been personally measured in practice:

(a) max inductance from a single-layer helix : H/D = 0.45 or so
(b) max Q from a single-layer coil *with no topload* = 1
(c) max Q from a single-layer coil *with topload* = 2.5 - 3.5

As a resonator gets larger, so too does the topload required to make 
the wire 1/4 wavelength long.

Malcolm

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