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Total 6 documents matching your query.

1. Topband: Re: ON4UN Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Fri, 15 Oct 1999 14:37:20 -0500; How about using an Amidon T-400-A powdered iron toroid core up there to shrink the physical size and wire length? 73, Roy K6XK -- FAQ on WWW: http://www.contesting.com/topband.html Submissions: topba; /archives//html/Topband/1999-10/msg00095.html (7,116 bytes)
2. Topband: Re: ON4UN Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 15 Oct 1999 20:24:03 -0400; It depends on the end application. Most often, toroids are not useful in a loading system. Toroids work best in high-shunt-capacitance or low-impedance systems. They have far too much distributed ca; /archives//html/Topband/1999-10/msg00096.html (8,227 bytes)
3. Topband: Re: ON4UN Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sat, 16 Oct 1999 12:38:17 -0500; "Toroids are lucky to make a Q of a hundred unless the reactance required is low, and they suffer from heating because losses are concentrated in a small area that isn't exposed to airflow." Hi Tom,; /archives//html/Topband/1999-10/msg00102.html (7,692 bytes)
4. Topband: Re: ON4UN Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 16 Oct 1999 22:41:52 -0400; Hi Roy, Exactly Roy, and that illustrates the point I tried to make. In a tank circuit, the amount of inductive reactance required is typically in the low hundreds of ohms, in the output inductor of; /archives//html/Topband/1999-10/msg00103.html (8,676 bytes)
5. Topband: Re: ON4UN Antenna (score: 1): Author: royanjoy@ncn.net (Roy Koeppe); Date: Sun, 17 Oct 1999 13:31:37 -0500; I'm taking liberty to forward this from being posted on Antennas Reflector. "An interesting analysis by Dr Sevick in his book 'Building and using baluns and ununs' in appendix IV. He analyzed the los; /archives//html/Topband/1999-10/msg00106.html (7,403 bytes)
6. Topband: Re: ON4UN Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 17 Oct 1999 18:18:26 -0400; Hi Roy, I disagree with that statement, based on actual measurements of inductors (rather than "paper estimates" of Q). I've seen some pretty wild calculations of Q, sometimes as much as twenty times; /archives//html/Topband/1999-10/msg00107.html (9,114 bytes)

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