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Old October 11th 03, 11:03 PM
Richard Harrison
 
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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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