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1. [Amps] L section of Pi-L filter (score: 1): Author: Ulf Tjerneld <star@frizon.org>; Date: Wed, 6 Jan 2010 19:33:05 +0100; Hi, Question 1: I'm considering using toroids in the L-section of my RF tank. Are there any guidelines regarding suitable cores, wires and turns? Question 2: If I stay with a traditional air wound co; /archives//html/Amps/2010-01/msg00028.html (6,810 bytes)
2. Re: [Amps] L section of Pi-L filter (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 6 Jan 2010 20:16:54 +0100; 1. Toroids have to be quite heavily dimensioned, as they are storing a lot of magnetic energy in a small space. At an L-network Q of 2 they have to store at least 2000 VAr in the toroid magnetic mate; /archives//html/Amps/2010-01/msg00032.html (8,612 bytes)
3. Re: [Amps] L section of Pi-L filter (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 6 Jan 2010 15:12:39 -0500; Alpha and others have been using toroids for 4 decades in L networks at 1500-2500W with no problems. The material used is a 2 Mix powdered iron from Micrometals with the cores appearing to be a stack; /archives//html/Amps/2010-01/msg00033.html (11,062 bytes)
4. Re: [Amps] L section of Pi-L filter (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Wed, 6 Jan 2010 14:14:25 -0600; To add to the recommendations, Pi-L is excellent. On the toroid, 3 words of caution: 1. The power dissipation comments below are exactly right. The toroid will heat up. And you want to keep the heat; /archives//html/Amps/2010-01/msg00034.html (12,549 bytes)

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