Isn't Type 43 the recommended as a Balun "Core Material" ?

Type 43 is optimal for the shortwave (HF) spectrum.

Why isn't Type 61 also a 'suggested' Balun Core Material ?

The 'Q' of type-61 makes it too selective for HF. You want the balun to
be broadband not peaked for a particular frequency.

Is it possible that the frequency
range is more dependent on the number of turns (inductance?) than the
actual material? This is not a trick question...

The ferrite composition plays a large role in determining the effective
frequency range of the coil. In the case of a balun/unun you're not
trying to make a tuned coil. You want it to be efficient over the
desired frequency range. See the following webpage for ferrite core
info':

http://www.universal-radio.com/catal.../amidonT1.html

FWIW: Reading your statement about the Binocular Cores, I
have just ordered some from Universal-Radio.Com to Test.
It is my understanding that One Turn 'counts' for Two when
You use a Binocular Core. Now Is That True ?

I would love to know this also, and also see a GOOD diagram of how to
wire a binocular core.

Here's how to wind ferrite cores, including binocular ones:

http://www.oselectronics.com/downloa...ansformers.pdf


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