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## Re: [TowerTalk] Two signals on the same frequency?

 To: towertalk@contesting.com Re: [TowerTalk] Two signals on the same frequency? Jim Brown jim@audiosystemsgroup.com Sun, 14 Aug 2011 14:23:10 -0700 mailto:towertalk@contesting.com>
 ```On 8/14/2011 1:48 PM, Chet wrote: > A hypothetical question: Study the fundamentals of antennas, antenna arrays, and fields in the ARRL Handbook and ARRL Antenna Book. The short answer is that the signals from multiple antennas will ADD algebraically, taking their magnitude and phase into account. That is, in some directions they will be exactly in phase and will be stronger, in other directions they will be varying degrees of out of phase and either add less, or cancel each other. if they are equal in level and 180 out of phase, they will cancel perfectly. EXACT:LY the same thing happens with reflected signals -- the vertical patterns of simple dipoles and vertical antennas are the result of reflections from the earth either adding or cancelling the direct signal. Ditto for multi-path, and even for much of what we call selective fading. 73, Jim K9YC _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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