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#1
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Roy Lewallen wrote:
Can someone please explain to me why a lower takeoff angle is better? Quoting from an old ARRL Antenna Book: "Rays entering the ionized region at angles above the critical angle are not bent enough to be returned to Earth, and are lost in space." "A significant loss of signal occurs with each hop. ... Assuming that both waves do reach the same point, the (one-hop) low-angle wave will contain more energy" (than the two-hop higher angle wave). -- 73, Cecil, W5DXP |
#2
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As commonly used (as on this thread), takeoff angle is a property of an
antenna, meaning the angle at which the antenna gain is maximum. What does that have to do with the angle of the wave being used for communication? Does changing the takeoff angle of your antenna somehow magically change the height of the ionosphere? Let's say the wave angle for communication is ten degrees. I have one antenna with a takeoff angle of ten degrees and another with a takeoff angle of 20 degrees. Which is better? Roy Lewallen, W7EL Cecil Moore wrote: Roy Lewallen wrote: Can someone please explain to me why a lower takeoff angle is better? Quoting from an old ARRL Antenna Book: "Rays entering the ionized region at angles above the critical angle are not bent enough to be returned to Earth, and are lost in space." "A significant loss of signal occurs with each hop. ... Assuming that both waves do reach the same point, the (one-hop) low-angle wave will contain more energy" (than the two-hop higher angle wave). -- 73, Cecil, W5DXP |
#3
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Roy Lewallen wrote:
As commonly used (as on this thread), takeoff angle is a property of an antenna, meaning the angle at which the antenna gain is maximum. We've been through all this before with references being provided to prove that the definition of "take-off-angle" is not limited to the angle of maximum antenna gain. -- 73, Cecil, W5DXP |
#4
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Please check the context of its use in this thread.
Roy Lewallen, W7EL Cecil Moore wrote: Roy Lewallen wrote: As commonly used (as on this thread), takeoff angle is a property of an antenna, meaning the angle at which the antenna gain is maximum. We've been through all this before with references being provided to prove that the definition of "take-off-angle" is not limited to the angle of maximum antenna gain. -- 73, Cecil, W5DXP |
#5
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Roy Lewallen wrote:
Please check the context of its use in this thread. I apologize if I missed the context. I don't read all the articles and sometimes jump into the middle of a thread, ill equipped for comprehending the context. But, to answer your earlier question: Why is take-off-angle important? Consider a 1/4WL 80m vertical used on 10m and you will know why. -- 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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