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  1. #1
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    SWR meter how its works?

    I found a SWR meter scheme and I do not understand it.

    T1 is current transformer primar is coaxial with measured SWR, ses is 7 an 38 turns
    C8/R5 is voltage divider connected over C9 to center of T1.

    I do not understand how it affects T1 output and why windings are in proportion 1:5.5?

    Thanks you

    Click image for larger version. 

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  2. #2
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    Re: SWR meter how its works?

    I thing variation of the Bruene principe

    Bruene_explanation_V13.pdf


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  3. #3
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    Re: SWR meter how its works?

    Thanks for information.
    I understand it correctly
    C8/R5 is voltage divider make for example prom 20V RMS on line 8.9V (for 15MHz) no C9
    over D1 go on R2 negative voltage as forward wave size
    over D2 go on R2 positive voltage as reflected wave size
    Because sec of T1 have ratio 1:5.5 Voltage on R2 will be
    negative if forward wave is 5.5 bigger than reflected wave
    0V if forward wave = 5.5 x reflected wave
    it is true?

    If yes my idea is redesign this for AD8302
    it means delete everything at the secondary and connect AD8302
    AD8302 have max input -60 - 0dBm (1mW)
    On measures line is for example 0-100W
    my question is
    what is the T1 suppression (CT) and how it counts?



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  4. #4
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    Re: SWR meter how its works?

    Look on tjis web
    respectively on excel sheet


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  5. #5
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    Re: SWR meter how its works?

    Using AD8302, you don't need a bridge circuit, just connect voltage and current channel to the detector.


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  6. #6
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    Re: SWR meter how its works?

    Thanks all for help ,
    I have already understood the issue of SWR
    I have a question about the problem of this problem, but for the sake of clarity I will create a new thread



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