On Thu, 27 Oct 2005 20:52:45 -0400, TRABEM wrote:


That being said....

....


I have a series resonant loop with moderately large conductor wire and
reasonably high Q capacitors. It's tuned to resonate at 60 KHz.

Is that to mean the loop circuit consists of an inductor (including
its radiation resistance and copper losses) of about j10 ohms and a
capacitor (including its losses) of about -j10 ohms and a load
resistance (being the 2 to 10 ohms receiver input Z) in series
(ignoring transmission line for the moment)?

You quote a Q figure and talk about expected bandwidth earlier in the
thread. Wary of making any unwarranted assumptions, is it safe to
assume that you know that it is the loaded Q that will determine the
bandwidth of the circuit in operation?

If you insert the rx input Z in series in the loop as described above,
you don't need a calculator to see that the loaded Q cannot be 200+,
and you might be lucky if it is better than 5 if the numbers you have
quoted are correct. This circuit is not likely to give you much front
end selectivity, is it?

Perhaps you need to consult a textbook to review your understanding of
unloaded Q, loaded Q, efficiency, and bandwidth, and where to apply
which Q value.

Owen
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