[TowerTalk] 10M 4:1 "Transformer"

[Larry Banks]

Hi All,

I am designing a rather unique 10m FM vertical for my local repeater 
net.  It has to fit into my attic, which is only 50" tall.  I have this 
antenna designed, and it "should" work, but it has an impedance of 
essentially 14 ohms.  (Typical for a shortened antenna.)  I want to 
fabricate a 4:1 transformer to facilitate this.  There are many such 
things available on the web, many of which I question. PLUS, I wish to 
design and build this myself.

I would appreciate any suggestions about how I should go about this.  
Ferrite type and size, etc.  I have to admit that I have not yet done an 
exhaustive search of the already available sources, especially all of 
the great stuff from Jim, K9YC.  What I have already looked at is lots 
of ads for questionable stuff.

73 -- Larry -- W1DYJ