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## [Towertalk] Re: [Force 12 Talk] XR dilemma

 To: [Towertalk] Re: [Force 12 Talk] XR dilemma n4kg@juno.com (n4kg@juno.com) Mon, 24 Jun 2002 06:39:23 -0600
 Hi Mark, I think our main disagreement comes over the the maximum angle that is supported on 10M. I believe that to be around 20 degrees (at very high MUF's). Some time ago, someone plotted his 10M SS contacts on a map. The vast majority were at skip distances of 900 miles or more, which corresponds to a 20 degree takeoff angle. At 18 ft, a 3L 10M Yagi places the majority of it's radiation between 20 and 30 degrees. 3 dB points are 15 and 40 degrees. Over 80% of the energy is above 20 degrees, i.e. going into outer space. At 35 ft, the 3 dB points are 7 and 22 degrees with the vast majority of the energy falling in the range of angles supported by the ionosphere. I see NO BENEFIT in going lower than 35 ft on 10M. Tom N4KG ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/web/.
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