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On 14 Oct, 08:07, "Dave" wrote:
"art" wrote in message oups.com... Equi is for equal, libra is the sign of Zodiac which is a pair of scales It means that a repetitive action must come back to its source. AC power has a cycle as in frequency, thus its circuit is one wavelength. A quad antenna represents a one wave circuit where total length is proportionat to time .ie a picture of events during one cycle. Now place along side of the quad a radiator of your choice where the length of the short radiator is superimposed upon the quad. For ease in foillowing the electrical circuit make your shorty antenna equal to one side of the quad So the race begins. Both travel up for a time at the SAME velocity. At the corner of the quad power travels onward until it gets to its originating point to complete a cycle The short antenna appears to have nowhere to go so what does it do? To duplicate the quad action it must have a circuit of some sort where the power can still travel forward during the time the power in the quad is still travelling to the originating point. Complete the circuit of the short antenna showing the series of events that occur upto the point that the events on the quad come to its point of beginning. Note The impedance of space is 377 ohms, the impedance of ground can be your choice. Art but a wave comes back to it starting point after 1/2 cycle then reverses. so why does your original assertion of a 1/2 wave 'gaussian' antenna still hold? now, for a 1/4 wave monopole, where does the other 3/4's of a wave come from?? and what happens to the power that is radiated? how does that ever return to it's source to be in equilibrium? would a circuit that was in equilibrium not be capable of radiating since everything has to return to the source??- Hide quoted text - - Show quoted text - Oh dear I forgot to mention, there is another path for current flow and that is at the center of the radiator. The impedance of this path is lower than the impedance to space so naturally that is the path the power will take. Now on this inner path there are no electrons to dislodge as the outer electrons have decayed before they reached the center path so the current during this time is just travelling without supplying radiation until it reaches the bottom of the radiator. But it's counter part the quad is radiating during this time ( How about that experts!) And by the way it was mentioned somewhere that the ground resistance was 2 ohms so one should now be able to determine the IMPEDANCE of ground at the antenna base point Now you take it from there....experts! Art KB9MZ...XG |
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Gaussian equilibrium | Antenna |