[TowerTalk] Adding an RF choke

[Jim Brown]

On 12/2/2024 11:54 AM, Jeff DePolo wrote:
> Why should the choke be made out of 75 ohm coax?  If the feeder Z0 is 75
> ohms by design then, sure, it makes sense to use 75 ohm the choke section
> and simply compensate for the added length, including the differences in VF
> as you mentioned if different.  But if the feeders are 50 ohms or something
> else, what's the benefit of the choke being 75 ohm cable specifically?

Of course, but most phased arrays are 4-squares, which use 75 ohm 
phasing lines, and that's what I assumed. :)

Also, note that the miniature 75 ohm cables listed in my 2018 Cookbook 
are rated for use in a 4-square at legal limit, where currents are much 
smaller than to a single antenna.

Thanks for the question -- I'm copying to the reflector so others will see.

73, Jim K9YC