[TowerTalk] Balun Recommendation

[Steve Hunt]

Jim,

I just double-checked my results for the 6 off #31 bead choke. I looked 
carefully at the ratio of the Resistive (loss) component of the choke 
impedance to the Reactive component, across the range 1MHz to 50MHz. 
Between 1MHz and 30MHz it closely tracks the complex permeability charts 
published by FairRite: in other words, below about 4MHz the Inductive 
reactance predominates, but anywhere between from 4MHz to 30MHz the 
Resistive component dominates and by the predicted ratio. Only above 
40MHz does the choke become predominantly Reactive again, due to the 
stray C involved.

I'm confident the bead entries on my chart are correct.

73,
Steve G3TXQ

On 17/04/2012 08:04, Jim Thomson wrote:
> ####  Look at Steve Hunts bar charts.   His bead baluns depict a MAINLY resistive component
> across the spectrum.   That’s the thin black line below.  http://www.karinya.net/g3txq/chokes/
> Steve only did 2 x bead baluns,  one with 6 beads, and the other  with 10 beads..and both bead
> baluns used type 31 material.
>
>