[TowerTalk] Solenoid or Binocular configuration?

[Jim Brown]

On 10/20/2012 7:23 PM, K8RI wrote:
> My question is about the difference between the 6 cores stacked or two 
> stacks side by side. 

For a ferrite choke with close-spaced turns, it does not matter if he 
cores are together or separated. What matters is the number of turns and 
the number of cores.  The inductance increases with the square of the 
number of turns, and in proportion to the number of cores. The 
capacitance increases with the number of turns and with close spacing. 
What you want is the lowest practical resonant frequency, and you can 
use the measured data in my RFI tutorial as a guide.  So for the lowest 
possible resonant frequency you want more turns and more cores, tightly 
spaced.

73, Jim K9YC