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Szczepan Białek wrote:
Now we should work out the consensus on which part of the radiator radiate the radio waves. Here's what you are missing: RF is AC. At some point in the radiation cycle, the instantaneous radiation has to be zero at the zero-crossing time. That is when the magnetic field energy is essentially zero and close to 100% of the energy is contained in the electric fields at the ends of the dipole. You cannot have it both ways. You cannot have a radiation peak at a net current maximum time and also have a radiation peak at a net voltage maximum time since they are ~90 degrees out of phase. If what you are saying were really happening, an antenna would radiate two times the applied frequency, but it obviously doesn't. Or did you not realize that when the electric field is at its maximum amplitude, the current is close to zero- crossing all up and down the standing wave antenna? The phase of the feedpoint current is within a couple of degrees of the phase of the current all up and down the antenna. That's why the current on a standing wave antenna cannot be used to measure the delay through a wire or a loading coil. All such "measurements" are bogus. -- 73, Cecil, IEEE, OOTC, http://www.w5dxp.com |
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