Richard
I broke my post down to a single questio
and for the life of me I cannot deduce
your position.
The question:
.......could it not oscillate
under ideal conditions ?
Yes or no.
If 'NO' is it based on the terminology of
'oscillation'
I am basing my thoughts on the law of reprocity
i.e.energy can be changed but not destroyed.
Best regardsand nothing personal intended
Art

(Richard Harrison) wrote in message ...
Art Unwin, KB9MZ wrote:
"If I have a loop circuit unconnected to a transmitter could it not
oscillate under ideal conditions?"

Ideal conditions would require a source of energy to replenish losses in
the loop circuit. The source has to be the same frequency as that
consumed in operation of the loop.

A loop like any conductor or circuit has a self-resonant frequency. At
resonance, the conductor`s inductive and capacitive reactances cancel.
This zero reactance leaves only resistance to limit current in the
conductor. Some of the total resistance may be a coupled load, and some
will be radiation resistance, which is the conductor`s loss of r-f
energy to radiation. Some energy will be lost in conversion to heat at
the surface of the conductor and perhaps other locations.

At frequencies not too far from resonance, reactance of the wire rises
so high that little current flows and the wire has little effect on
anything.

Broadcasters are faced with structures which arise near their antenna
arrays. At times these are resonant at the broadcast frequency and if so
they absorb and re-radiate energy distorting the station`s radiation
pattern. The solution is usually simply applying something to the new
structure to detune it from resonance at the broadcast frequency. If not
very near resonance, the structure won`t pickup enough energy to cause
trouble. Too much reactance to allow current flow.

The hard fact that a structure must be near resonance to admit
significant energy makes broadbanding an antenna by an appurtenance
tuned to some frequency other than the fundamental frequency of the
antenna challenging. One method that works is a combination of antennas
resonant for all the desired frequencies.

There are other methods to get a wire to accept current over a wide
frequency range. Wave antennas are an example. But, standing wave
antennas are the most common and these need resonance or thereabouts.

Best regards, Richard Harrison, KB5WZI