Topband: broadband transformer help please

[Felipe Ceglia - PY1NB]

Hi,

I am about to make a pair of 3:1 (900:300ohm) transformers using a 
binocular core for a waller flag receiving antenna.

The fact is that I only have one pair of similar binocular cores 
available and I don know their permeability values.

I measured: 1.22uH for one turn, and 4.48uH for 2 turns on it.

So, I ask... What is the equation for finding out permeability numbers 
for it? I would like to have this xfmer working from 1.8 to 7.5Mhz, 
would it be possible with this core?

thank you for your attention,

Felipe - PY1NB


ps: I found this document, but it was OCR'd and the formula got screwed. 
It shows on the last page.
http://www.oselectronics.com/downloads/Broadband%20Transformers.pdf


-- 
Felipe Ceglia - PY1NB
-------------------------------------------------------------------------------------
PR1T team member /// Rio DX Group member /// Araucaria DX Group member
http://www.dxwatch.com /// http://reversebeacon.net /// http://riodxgroup.dxwatch.com