"John KD5YI" wrote in
:

....
Owen -

I've had this nagging idea for a couple of years: What if the
(single-turn?) loop passes through a toroid which already has, say, 10
or so turns on it? That should give an impedance step-up of 100 or so.
Would that not be a good way to at least get the matching closer? In
fact, the tuning capacitor could be connected to the high impedance
side to reduce the capacitor's value.

Your comments will be appreciated.

I doubt that the transformer you propose would be near as efficient as the
transformer formed by a smaller feed turn. Though it is tempting to explain
a transformer using turns ratio, the case of the smaller turn is explained
by the ratio of main loop flux intercepted by the feed loop, and that is
determined by area... so deforming the feed loop to change its area will
adjust the transformation.

Owen