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SWR meter how it works?

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coper1

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Could someone explain how these work tjis circuits?

SWR1.png

SWR.png

I know this somehow compares forvard current from TX to load with reflected wave reflected from the load.
however, I do not know how, and especially how to calculate results
your advice?
is somewhere in detail described the circuits?
 

Thanks for this interesting video, but it comes to me rather a version with center taped current transformer
I make this picture.
It is this true or am I wrong
SWR3.png
 

See on Breune coupler or Breune meter for example
eventually Stockton coupler or meter.
 
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    coper1

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