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1. [TowerTalk] antenna quiz? (score: 1): Author: "30KR239 Fernando" <30kr239@dxhunters.com>; Date: Mon, 12 Dec 2005 12:35:25 +0100; Hello, I´m in the process of buying a new antenna, an Optibeam OB10-3W. I´ve been told that this antenna presents an impedance of 25 Ohms at the feedpoint that´s what I would need t; /archives//html/Towertalk/2005-12/msg00245.html (7,665 bytes)
2. Re: [TowerTalk] antenna quiz? (score: 1): Author: "Keith Dutson" <kdutson@sbcglobal.net>; Date: Tue, 13 Dec 2005 10:38:22 -0600; What does the manufacturer recommend? Would the 2:1 balun be for 100 ohms rather than 25? I would try to get feed point impedance to 50 ohms then use a standard 1:1 current balun or RF choke. A hairp; /archives//html/Towertalk/2005-12/msg00246.html (8,424 bytes)
3. Re: [TowerTalk] antenna quiz? (score: 1): Author: Larry Phipps <larry@telepostinc.com>; Date: Tue, 13 Dec 2005 11:17:29 -0500; No, as long as the balun is properly designed. 25 ohms is a pretty typical value for yagi feedpoints. Most manufactureres supply a matching device to 50 ohms, but the actual feedpoint is probably in; /archives//html/Towertalk/2005-12/msg00248.html (8,238 bytes)

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