[Elecraft] Toroids frequency range and baluns

[Jim Brown]

On Fri, 19 Sep 2008 20:45:57 -0700, Ron D'Eau Claire wrote:

>"Balun" is an unfortunate, all-inclusive and misleading term. One so-called
>"balun" may be as different from another "balun" in its requirements and
>application as a motorcycle is different from railroad locomotive. 

Yes, it really is. 

>I stand by my statement when talking about a "choke balun" consisting of a
>string of ferrite beads on some coax or a coaxial line on a coil form such
>as I  described. The only losses caused by such a balun will be those of the
>transmission line itself, which cannot be ignored if the SWR is high.

Yes on all counts. BUT -- the chokes wound as a coil are vastly superior. 

>So-called "baluns" that transform impedances are, typically, transformers --
>often transmission-line transformers. They're a whole different animal and
>can be very unpredictable, especially when they use ferrite or powdered iron
>cores and are exposed to a wide range of impedances.  

Yes. Again, poor use of words by the industry. 

73,

Jim K9YC