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![]() Cecil Moore wrote: wrote: Cecil, Don't you mean that when a ground wire is N*1/4 wavelength at a particular frequency it locates the voltage mininum (current maximum) at the transmitter, and the voltage maximum well away from the transmitter. Nope, Mother Earth dictates the boundary conditions. A well-designed ground system positions the current maximum point at the ground system, i.e. minimum impedance to ground. The voltage maximum point would, therefore, be located at the transmitter, not a desirable condition. Of course, if you are not actually connected/ coupled to Mother Earth, your milage may vary. -- 73, Cecil http://www.qsl.net/w5dxp I thought we were talking about 2nd floor, not well designed ground systems, with the ground NOT connected to earth. But it is the best you can do. That is where an artifical ground can help by locating the voltage minimum at the transmitter. Gary N4AST |
#3
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wrote:
That is where an artifical ground can help by locating the voltage minimum at the transmitter. Yes, that's true. An artifical ground equalizes the voltage at the ground point AND at the transmitter so both are voltage minimum (current maximum) points. That's exactly what an antenna tuner does when feeding a resonant 1/2WL dipole fed with ladder-line through an antenna tuner. I hope I didn't misunderstand what you were trying to say. -- 73, Cecil http://www.qsl.net/w5dxp |
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