"AL KA5JGV" wrote -
Reg, thank you for the detailed explanation. You have given me plenty to
work with and to contemplate on for my next loop project.

=========================

Al, I was able to respond in some detail to your query because you gave me a
clear idea of your objectives. It was also a topic likely to be of interest
to other readers. I do appreciate that many questioners are unable to
descibe a problem in terms which people like me (I'm no genius. Neither am I
a mind-reader) are unable to understand sufficiently clearly. Furthermore,
I have to be aware the enquirer is as likely to be just as unable to
understand my reply as I am in understanding him. I have to guess a person's
circumstances from an extremely limited amount of 'data'.

If we're not careful a thread continues with further questions, is extended
interminably by well-intentioned and other 'do-gooders' and eventually
fizzles out with everybody suffering from raised hackles. I mention these
aspects of newsgroup info-exchange, or often mis-information exchange, for
the benefit of other readers. Everybody has a different motive for joining
in.
.................................................. .................

Just to complete our technical discussion, if program RJELOOP3 does not make
itself clear, then if you have N turns on the main loop and one turn
closely-coupled turn of the same diameter connected to the receiver, then
the Q of the main L-&-C tuned loop is damped with a resistance across it
equal to N-squared times the receiver input resistance.

So, if there are 6 turns on the main loop and the receiver input resistance
is 1000 ohms (a bipolar transistor) then the equivalent resistance shunting
the main loop is 36,000 ohms. If the parallel resistance of the main loop is
100,000 ohms (a typical MF value) then the resulting operating Q of the
circuit is reduced to roughly 1/3rd of its intrinsic value. This is
over-coupling but may be acceptable.

But if the receiver input resistance is 50 ohms then you will feel obliged
to do something about it. As you cannot reduce the number of turns on the
coupling coil to less than 1 then, as described in my original reply, there
is no alternative but to reduce the diameter of the coupling coil, either a
square or circular, and locate it inside the main loop in the same plane.
Using 12 or 10 gauge enamelled wire (a better appearance) it will be
self-supporting.

Reply not needed. Just make an entry in your notebook. I have volumes A to
S. The bookcase shelf is sagging. You are sure to be successful with your
experiments. It is impossible for an experiment to fail. ;o)
---
Reg, G4FGQ