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Total 3 documents matching your query.

1. Topband: Unun on FT-240-61 (score: 1): Author: Björn Mohr <bm@broadcast.se>; Date: Sat, 23 Dec 2006 11:14:53 +0100; Hi Gang! I am about to make an unun for my top loaded topband vertical using a FT-240-61 core. I need a 2:1 ratio as the antenna has around 25 ohms feed point impedance using two elevated radials. I; /archives//html/Topband/2006-12/msg00242.html (6,658 bytes)
2. Re: Topband: Unun on FT-240-61 (score: 1): Author: Sinisa Hristov <shristov@ptt.yu>; Date: Sat, 23 Dec 2006 08:11:30 -0500; 1) With FT240-61: preferably at least 8 turns of a trifilar "cable"; connect all 3 wires in series (keeping connections short and close to the core); connect 50 Ohms to the "top" and the "bottom" lea; /archives//html/Topband/2006-12/msg00247.html (7,755 bytes)
3. Re: Topband: Unun on FT-240-61 (score: 1): Author: Björn Mohr <bm@broadcast.se>; Date: Sat, 23 Dec 2006 15:52:40 +0100; Thanks for your input Sinisa and George, It is very useful information. I have to make a correction to my previous posting though, the antenna measured around 16 ohm, not 25 that I initially stated.; /archives//html/Topband/2006-12/msg00249.html (8,029 bytes)

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