[TowerTalk] Feedline (choke) question

[Jim Brown]

Brian,

I suggest that you study my work on this. Fundamental concepts are in 
k9yc.com/RFI-Ham.pdf  You clearly are not aware of the fundamental 
concepts on which effect HF and MF chokes are based.

A coil of coax is NOT an effective choke at HF.

73, Jim K9YC


On 9/26/2025 11:12 AM, Brian Beezley wrote:
> If you had enough extra feedline at the spot you wanted to install a 
> secondary choke, a simple solution for a single band might be a coiled- 
> coax choke. These air-core chokes act as a trap with very high 
> impedance. The length of coax required is somewhat less than a quarter 
> wavelength.
>