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Art Unwin, KB9MZ wrote:
"The question ....Could it oscillate under ideal conditions? Yes or no." A tuned loop can not "oscillate", that is, to continue repeating a cycle of motions with strict periodicity, if it does not have a continuing supply of the resonant frequency. Analogies pose problems, but a resonant device responds to a particular frequency and ignores others. A resonant-reed low-frequency indicator is a vivid analogy of a collection of tuned circuits. Only the resonant reed responds to excitation which is applied to all of the reeds. Likewise, a resonant loop must be excited at its resonant frequency to accept and re-radiate energy. A collection of dipoles and loops may be exposed to r-f. If one of the collection is resonant, it accepts energy and re-radiates. A common inference from the word oscillation is production of continuous waves. The device making the oscillation is called an oscillator. I`ve seen loops and I`ve seen oscillators, and a loop without an active circuit is no oscillator. Best regards, Richard Harrison, KB5WZI |
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