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1. [TowerTalk] ferrites for antenna tuners? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Wed, 09 Nov 2005 20:29:12 -0800; I'm designing a computer controlled matching network for HF (1.8-30 MHz), and I'm looking for suggestions as to the type and size of the toroids to use in the switchable inductors. Say we're handling; /archives//html/Towertalk/2005-11/msg00310.html (7,544 bytes)
2. Re: [TowerTalk] ferrites for antenna tuners? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Wed, 09 Nov 2005 20:54:23 -0800; OK.. Let's say we want L from around 0.1 to 20-30 uH in a 1,2,4 kind of sequence (so we'd like to choose cores with a permeability such that we can get an exponential sequence with integer numbers of; /archives//html/Towertalk/2005-11/msg00312.html (9,387 bytes)
3. Re: [TowerTalk] ferrites for antenna tuners? (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 10 Nov 2005 00:01:25 -0800; You're not counting turns correctly, Jim. If you add 1 to your # turns above, then the inductance numbers work out according to N^2. I made this same mistake when I was measuring toroids recently. Yo; /archives//html/Towertalk/2005-11/msg00316.html (9,182 bytes)
4. Re: [TowerTalk] ferrites for antenna tuners? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 10 Nov 2005 06:50:43 -0500; squared... (which The "number of turns squared" only applies when there is negligible capacitance distributed throughout and across the winding and the flux leakage is zero. You'll find for example; /archives//html/Towertalk/2005-11/msg00318.html (8,847 bytes)

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