On 1/26/21 5:29 AM, Dave Daniel wrote:
That doesn’t really illustrate the fundamental concept of Q. I’ll try and think
of something that is still non-mathematical but nonetheless illustrates the
concept of Q.
DaveD
Ultimately, Q is about internal (or external) losses (leaving aside
antennas) - how much energy is stored, vs (how much is radiated) or lost
to heat
A big heavy pendulum will swing for a lot longer than a light one,
because more energy is stored in the system, relative to the amount lost
to air and mechanical friction.
And that, like the wine glass (which is a nice mechanical analogy - the
fine crystal has less internal damping) is a "impulse response" system,
not a "driven system"
But how that relates to bandwidth is a bit tricky, because then you need
to get into a discussion "driven systems" and then into resonance - and
that is where the train will come off the rails, particularly with
respect to antennas.
On Jan 26, 2021, at 07:28, Ole Petter Ronningen <[email protected]> wrote:
Hi, All
I am going to give a presentation to non-nuts, and in one of the slides I
touch on Q - not wanting to spend more than a sentence or two on the
subject, I wonder if the following analogy works:
"A quality long-stemmed, thin-walled wine glass will ring for a long time
after we give it a little tap - this is high Q. A thick-walled, stubby milk
glass will barely ring at all, just a dull "plink" - this is low Q. The
energy we put in dies out very quickly."
As I am sure is embarrassingly evident, I have a rather tentative grip on
the subject myself..
Ole
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