Ft240-31 toroid RF choke/1:1 balun build help.

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KJ7LPI, Apr 17, 2021.

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  1. 2E0VSS

    2E0VSS Ham Member QRZ Page

    Have a look at THE Ai6RW (Richard Wheeler) choke he has suggested on his site/Slides..

    M
    73
     
  2. KJ7LPI

    KJ7LPI Ham Member QRZ Page

    Ok. Thanks I will look into it
     
  3. KJ7LPI

    KJ7LPI Ham Member QRZ Page

    I will thanks!
     
  4. KZ5R

    KZ5R Subscriber QRZ Page

    Interesting, do you know what mix the cores are and what was used to do the common mode testing? Our testing came out looking like this using an AIM4170, have not run them on the VNA yet. The dotted line is crossover model
    B Crossove Comparison.jpg

    Bob
     

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