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1. [RFI] toroids (score: 1): Author: Tom Horton <k5iid@sbcglobal.net>; Date: Sat, 14 Aug 2004 20:59:01 -0700 (PDT); I have quite a few miscellaneous toroid cores. Is there any way to determine what the mix is in them? I know, it's a silly question, but I get sillier the older I get. Thanks, 73, Tom K5IID Tom Horto; /archives//html/RFI/2004-08/msg00016.html (6,325 bytes)
2. Re: [RFI] toroids (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 14 Aug 2004 23:01:35 -0700; Yes and no, Tom. You can wind a known number of turns on each toroid and then measure the inductance with an impedance analyzer like the MFJ-259B. From the physical dimensions of the toroid (cross se; /archives//html/RFI/2004-08/msg00017.html (8,336 bytes)
3. Re: [RFI] toroids (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sun, 15 Aug 2004 10:13:10 +0100; Michael Tope wrote: Yes and no, Tom. You can wind a known number of turns on each toroid and then measure the inductance with an impedance analyzer like the MFJ-259B. From the physical dimensions of; /archives//html/RFI/2004-08/msg00018.html (10,531 bytes)
4. Re: [RFI] toroids (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 15 Aug 2004 06:15:43 -0400; each analyzer And that's all you need to do. You don't need to know the manufacturer OR the mix, all you need to know is the impedance. 73 Tom _______________________________________________ RFI mai; /archives//html/RFI/2004-08/msg00019.html (7,559 bytes)
5. Re: [RFI] toroids (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Sun, 15 Aug 2004 06:20:12 -0400; You can, with something like a network analyzer, get the R and X values and look through manufacturer's data and get an idea what type core you may actually have, but that sometimes isn't totally ac; /archives//html/RFI/2004-08/msg00020.html (7,224 bytes)
6. Re: [RFI] toroids (score: 1): Author: Cortland Richmond <ka5s@earthlink.net>; Date: Sun, 15 Aug 2004 06:51:14 -0700 (GMT-07:00); Well done, Ian; clear, concise, and useful. One sentence of your post particularly resonates with me (heh!): "In fact there are *no* exact equivalents between different manufacturers - they don't eve; /archives//html/RFI/2004-08/msg00021.html (7,325 bytes)
7. Re: [RFI] toroids (score: 1): Author: Cortland Richmond <ka5s@earthlink.net>; Date: Sun, 15 Aug 2004 07:07:47 -0700 (GMT-07:00); GOOD topic! I like Tom's approach myself; it's easy to do. Some of the folks I've worked with (and for) require more. And the impedance in a fixture is not a CERTAIN predictor of performance on a wir; /archives//html/RFI/2004-08/msg00022.html (7,387 bytes)
8. Re: [RFI] toroids (score: 1): Author: Tom Horton <k5iid@sbcglobal.net>; Date: Mon, 16 Aug 2004 11:30:01 -0700 (PDT); Thanks to all the guys for all the answers... Seems that for my purposes, it's a whole lot easier than I thought. 73 and thanks again. Tom K5IID I like Tom's approach myself; it's easy to do. Some of; /archives//html/RFI/2004-08/msg00028.html (8,296 bytes)

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