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In rec.radio.amateur.antenna gareth wrote:
As we all know, the atmosphere greatly affects the propagation of radio waves, with all the various layers, and the effect of the Sun and sunspots on propagation through the atmosphere. Is it therefore not beyond the bounds possibility that this same atmosphere affects the initial propagation of radio waves away from our antennae, and that somehow is the reason why short antennae are poor radiators compared to antennae of significant (1/4 lambda) fractions of a wavelength? No. It is easily shown by a little analysis that electrically short antennas are "poor radiators" because of their low input impedance and all the losses associated with feeding that low impedance from a real world source. -- Jim Pennino |