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Reduce RFI with a Common Mode Choke

Discussion in 'Amateur Radio News' started by VK7HH, Sep 29, 2021.

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  1. VK7HH

    VK7HH Ham Member QRZ Page

    Common Mode Current on your coax can really mess up causing RFI and interference in the shack. In addition, you could also be receiving unwanted interference on the coax outer shield.

    In this video I show how I built myself an easy CMC choke using a toroid and RG-58 coax.

     
    PS8ET, WK0DX, KC7ZXY and 13 others like this.
  2. KR3DX

    KR3DX Ham Member QRZ Page

    Why the "split winding"? Can someone refute what is presented here?: http://w8ji.com/toroid_balun_winding.htm
    I'm not trying to be critical or demeaning, it's just that if you want to present something as fact, make sure that it is factual.
     
    W1YW, SM6CJB, K0WJ and 1 other person like this.
  3. KA5DJS

    KA5DJS Ham Member QRZ Page

    So whats the issue
     
    WK0DX, AD6FR, WA7KSJ and 2 others like this.
  4. KA5DJS

    KA5DJS Ham Member QRZ Page

    Whats not factual.
     
    SV1LJA, W1YW, WK0DX and 3 others like this.
  5. W9NUP

    W9NUP Ham Member QRZ Page

    What about minimum bend radius for the coax?
     
    KG0BK, K0WJ, PU2OZT and 4 others like this.
  6. W1MDM

    W1MDM XML Subscriber QRZ Page

    does it work?
     
    PU2OZT and M1WML like this.
  7. AI5DH

    AI5DH Ham Member QRZ Page

    Why would you use RG-58 and an enclosure for? So amateur-like.
     
    K5MPH, K0WJ, PU2OZT and 1 other person like this.
  8. K5YVY

    K5YVY Ham Member QRZ Page

    This is amateur radio... and who don't like a project box? :)
     
    WK0DX, KC7ZXY, KK6RJR and 14 others like this.
  9. 2E0TWD

    2E0TWD Platinum Subscriber Platinum Subscriber QRZ Page

    Appreciate this, thanks.
     
    KG7QJB, KC7ZXY, VK3SQ and 4 others like this.
  10. K5QBF

    K5QBF XML Subscriber QRZ Page

    Moving the windings apart is intended to reduce capacitance between input and output or so I am told.
     
    VK3SQ, AD6FR, M1WML and 2 others like this.

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