[TowerTalk] Test Fixture for Common Mode Chokes

[David Gilbert]

Yes ... but I assume that we want to place the CMC as close to a current 
maximum as we can, so we kind of need to know where that is.  Am I wrong 
about that?

73,
Dave AB7E



On 1/25/2026 3:10 PM, Brian Beezley wrote:
> AB7E wrote:
>
> "(the process is useless if you only do it in one spot since as you 
> say it could be a current minimum)"
>
> But the shield may have a traveling wave, either due to radiation or 
> nearby lossy objects, the latter especially for underground coax. Even 
> a partial traveling wave that includes some residual standing wave can 
> fill in current dips.
>
> Here's a model of a traveling wave on coax feedline. I did this to 
> model a very long feedline. You just place a resistive load near the 
> end. Adjust the position and resistor value for flattest current.
>
> I'm posting this link mainly because I was disappointed with the image 
> in my last post. It was supposed to be a bare image, not one embedded 
> in a page of stuff. Let's see if this image-hosting service renders 
> just the image:
>
> https://iili.io/fPBFT9s.gif
>
> If it looks good, the service is here:
>
> https://freeimage.host/
>
> If not, I'll try to find another.
>
> Brian
>
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