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1. Re: Topband: Helically wound vert (score: 1): Author: "Roy" <royanjoy@ncn.net>; Date: Fri, 17 Jul 2009 11:28:58 -0500; "Radiation efficiency is around 60% on 40 meters, 20% on 80 meters, and 7% on 160 meters. For a 23' vertical this is not bad." Over all system efficiency depends upon effective ground system resistan; /archives//html/Topband/2009-07/msg00073.html (6,691 bytes)
2. Re: Topband: Helically wound vert (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Sun, 19 Jul 2009 09:35:15 -0600; For the 5BTV on top band the radiation resistance of the 22' top loaded vertical is about 3 ohms. The RM80S "resonator", or top loading inductor loss is 20 ohms (that is high). Given a GND loss resis; /archives//html/Topband/2009-07/msg00077.html (8,259 bytes)

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