[TowerTalk] Feedline (choke) question

[Brian Beezley]

On 9/26/2025 8:34 AM, Joe Subich, W4TV wrote:

> One would need at least a dozen clamp on cores to achieve a
> significant (> 1K) choking impedance.
Thanks for looking up the data, Joe. I have an old K6NA bead choke 
somewhere in the garage. As I recall, it's about a foot long. Maybe it 
uses a dozen beads.

Clamping a dozen beads still sounds easier to me than severing the coax 
and installing connectors. You could use a split toroid to accommodate 
multiple turns, but I don't see an easy way to hold it all together 
under stress. I can imagine some schemes, but they are pretty Rube Goldberg.

Incidentally, I used some bare clamp-on cores outdoors for several 
years. When I finally took them down, I was surprised that the core 
material looked like new. I mention this for interest, not because I 
recommend it.

Brian