Telamon -

Can you please explain mutual inductance? Is that like coupling
coeficcient sp?

If we short one winding out and measure the other winding's inductance
then we will have a measure of the coupling between the two coils. The
lower the inductance measured then the lower the stray inductance - or
supposedly the better the coupling. With fewer turns then I think
maybe the lower the stray leakage we will measure.

Am I on the right track?

I think the balun design can use the very small cores as long as we
dont want to transmit. Correct? I am thinking that since the voltage
we will see across the coil In receive mode is microvolts then we don't
have to worry too much about wasting power magnitizing the core. So
then use only a very small number of turns.

I have to build a balun too for a T2FD I am putting in the attic. I
have Doug DeMaw's ferrite design book that I will open tonight when I
get home.

Not so many good places to find info on receive baluns on www.

regards,
Bob
N9NEO