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#16
October 11th 03, 04:01 AM
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Richard Clark wrote in message . ..
On 10 Oct 2003 08:06:45 -0700, (Art Unwin KB9MZ) wrote: Richard, If I have a loop circuit unconnected to a transmitter could it not oscillate under ideal conditions? If it can then would it not radiate at the frequency that it is resonant at as well as reradiate at the frequency of the energy input Regards Art Hi Art, Distinguish between what resonates and what oscillates. Passive circuits do not oscillate even though they support the flow of alternating current. If what you state above is correct then I am wrong since basically what I am descibing is a passive feedback circuitu Art The ideal conditions for oscillation is the presence of a power source, gain, and feedback. If any of the three is missing, then there is no oscillation. The ideal conditions for resonance is an external source of alternating current coupled to a system that is harmonically related. If that system has no harmonic relation, then there is no oscillation or resonation. ALL systems that support the flow of alternating current radiate. How well this is performed is called efficiency. You cannot change a frequency without a nonlinear interface (like a diode) or without the original excitation source containing spurs (illegal at the antenna). 73's Richard Clark, KB7QHC |
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