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1. [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Wed, 01 Feb 2006 15:24:54 -0500; All, What has been your experience in the wide-band transformer core material types available for use on 160-10 meters in both Ferrite, and Iron Powder, or the types recommended to use? Available mat; /archives//html/Amps/2006-02/msg00015.html (7,792 bytes)
2. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Thu, 02 Feb 2006 11:15:19 -0500; Rich, ** REPLY SEPARATOR ** That;s what I thought too until the Guys at Palomar Engineers mentioned using 61. Below is from Amidon; Material 61 (µi = 125): Offers moderate temperature stability; /archives//html/Amps/2006-02/msg00023.html (11,279 bytes)
3. Re: [Amps] Queation on toroid core materials (score: 1): Author: John Popelish <jpopelish@rica.net>; Date: Thu, 02 Feb 2006 11:54:21 -0500; First of all, there is some confusion using the word "saturates". Magnetic saturation involves a sharp drop in permeability as the magnetic flux passes through some large positive or negative value.; /archives//html/Amps/2006-02/msg00024.html (10,245 bytes)
4. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 03 Feb 2006 15:25:12 -0500; Rich, I went and read some of the book "Practical RF Communications Data" by Doug Demaw on this. Below is a quote; "The type of core material used will depend to a great extent on the required bandwi; /archives//html/Amps/2006-02/msg00060.html (14,797 bytes)
5. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 03 Feb 2006 17:40:57 -0500; I also had a look at a book I about forgot I had named Ferromagnetic-Core Design & Application Handbook, also by Doug Demaw. The part about 61 material came up one time in a conversation with a tech; /archives//html/Amps/2006-02/msg00067.html (17,650 bytes)
6. Re: [Amps] Queation on toroid core materials (score: 1): Author: R.Measures <r@somis.org>; Date: Sat, 4 Feb 2006 08:11:12 -0800; hogwash. The mfg rates it at c. 1MHz. On a 'o-scope, the distortion is obvious. Demaw should have looked. Richard L. Measures, AG6K, 805.386.3734. www.somis.org ______________________________________; /archives//html/Amps/2006-02/msg00080.html (16,730 bytes)
7. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 19 Feb 2006 11:31:10 -0600; I'm a bit late to the table on this issue, because I've been on the road almost continuously for three weeks. But I have some comments that might shed some light. First, I agree with John's comments; /archives//html/Amps/2006-02/msg00349.html (12,216 bytes)
8. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 19 Feb 2006 14:59:59 -0500; Jim, That's exactly the way the tech at Palomar Engineers explained it to me years ago. The problem was that 43 material got too hot to the point of ruin. The only help for that would be use a good a; /archives//html/Amps/2006-02/msg00354.html (15,311 bytes)
9. Re: [Amps] Queation on toroid core materials (score: 1): Author: Bill Turner <dezrat1242@ispwest.com>; Date: Sun, 19 Feb 2006 12:09:00 -0800; Observing quietly from the sidelines but now have a question: Why use ferrites for transformers when powdered iron seems to have superior loss properties, especially in the HF region? Or doesn't it?; /archives//html/Amps/2006-02/msg00355.html (8,069 bytes)
10. Re: [Amps] Queation on toroid core materials (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 19 Feb 2006 17:58:16 -0500; Bill, Really it's over the really low permeability of iron powder compared to ferrite that would make it hard to use a one-turn winding. Iron powder does come in handy though for combiners/splitters; /archives//html/Amps/2006-02/msg00357.html (8,889 bytes)

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