[TowerTalk] Fair rite materials for choke baluns

[Jim Brown]

On Mon,7/4/2016 7:37 PM, Richard (Rick) Karlquist wrote:
> Where people get into trouble is when they are
> driving some wire antenna over many octaves of bandwidth
> and the impedance is all over the place (not to mention the
> antenna pattern). 


YES! They look at the TX output, see 50 ohms, look at the Zo of the 
line, see 450 ohms, and think those are the impedances they are 
matching. Nope -- the Z on the secondary is the wildly variable 
feedpoint Z of the antenna at the operating frequency, transformed by 
the length of the line, which varies as a function of frequency.

73, Jim K9YC