Topband: Vertical choke needed?

[Jim Brown]

On 12/31/2020 7:09 PM, Artek Manuals wrote:
> Not hard to measure see 
> https://forums.qrz.com/index.php?threads/measuring-common-mode-current.623054/page-2. 
> you can make a simple common mode choke and do a before and after to see 
> the relative change..if any

I haven't read the link, but common mode current follows the behavior of 
the feedline as an antenna, so common mode current distribution along 
the feedline will vary as with a piece of wire having the dielectric 
properties and dimensions of the feedline, and connected as the feedline 
is. In other words, that feedline is part of the antenna.

So the obvious question is, how many measurements along that feedline 
are you willing to make? :)

73, Jim K9YC