Re: [TowerTalk] Feedline (choke) question

[Brian Beezley <k6sti@att.net>]

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.
Measurements and models for a coiled-coax choke for 88-108 MHz:

https://k6sti.neocities.org/balun

Brian

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