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Craig Buck wrote:
I was talking about radiation efficiency taking into account the ground losses. The ARRL Antenna Book equation is Efficiency = Radiation Resistance divided by the sum of Radiation Resistance + Ground loss + Coil loss. Plug in a 6 ohm ground loss and whatever you want to assume for the coil loss. The higher the radiation resistance the higher the efficiency. No? For an 8 ft center-loaded whip on 75m, the ARRL Antenna Book gives 0.8 ohms as the radiation resistance and 22 ohms as the feedpoint impedance. That's an efficiency of about 3.6%, about 4 watts radiated for 100 watts input. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
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