[Elecraft] Toroids frequency range and baluns

[James Duffey]

Bob - You wrote:

"Why are choke baluns wound as a coil vastly superior to choke baluns  
made with a sting of ferrite beads? With the coil type, you're adding  
additional coax loss... What am I missing here?"

I didn't see an explicit reply to this on the list, but the short  
answer is that with a coil balun, the inductance increases as the  
square of the number of turns. With the beads, the inductance just  
increases as the number of the beads. So, ignoring stray capacitance,  
a toroid with 10 turns will have 10 times the inductance of the same  
cable passed through 10 toroids (beads). You get more bang for your  
buck by coiling the cable. The additional losses are not too great for  
most applications. - Duffey
--
KK6MC
James Duffey
Cedar Crest NM