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## [TowerTalk] Re: [DX] [Fwd: Low yagi question]

 To: [TowerTalk] Re: [DX] [Fwd: Low yagi question] lightfol@cadvision.com (lightfoots VE6PV) Sat, 5 Jul 1997 00:43:14 -0700
 ```>GROUND REFLECTION coefficients depend SOLELY on HEIGHT >above ground (in wavelengths). A tribander's pattern will peak at >different angles on the different bands because it's (fixed constant) >height is different for each band in terms of wavelengths. > >de Tom N4KG NO. Wrong way around Tom. Ground reflection coefficients do not depend solely on antenna height. In fact, the PERFORMANCE of an antenna at a PARTICULAR height depends upon reflection coefficients. Remember that mathematically, reflection coeffiecient is known as: Reflected Wave/Incident wave * /_(angle) in degrees. This is a function of the ground characteristics, since it's the amount of reflection will change with the incident angle. Since this is entirely a GROUND characteristic, antenna height will only perform to the degree of reflection coefficient for that particular ground. So...the performance of the antenna at X wavelenths in height will DEPEND solely on the characteristics on the ground (reflection coefficient). It doesn't matter how high an antenna is, it does not alter the reflection coefficient- it is always what it is, since it is determined by the ground conductivity and the physical shape of the ground itself. I know, I know, I'm picking pepper again...... oh well IT'S BETTER THAN TALKING ABOUT VANITY CALLS!!!!!!!!!!!!! 73 de Shawn VE6PV lightfol@cadvision.com Suggested Serving, Antennas not included. --------------------- |*******************| |* *| |* ANTENNA FARMS *| |* *| |*******************| --------------------- -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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