Toroids and Baluns

Discussion in 'General Technical Questions and Answers' started by K5ATG, Mar 14, 2018.

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  1. K5ATG

    K5ATG Ham Member QRZ Page

    First things, I do not understand toroids and I hope to change that someday. I need to make a switchable balun like the Elecraft BL2 Balun. It is switchable between 1:1 and 4:1 . In my junk box I have T50-6 toroids and T68-6. Is it possible to make 1:1 and 4:1 baluns with these toroids, if so how do I determine the number of winding's. It will be for QRP power levels only with no more than 10 watts for SSB.
  2. KU3X

    KU3X Ham Member QRZ Page

    First of all, powered iron cores DO NOT make good current baluns. You MUST use ferrite.
    Want to learn all about baluns? Read this:

    The ARRL hand book or ARRL antenna books are both good places to learn about baluns.

    No matter how you slice it, "Use Ferrite !"

    Barry, KU3X
  3. W5DXP

    W5DXP Ham Member QRZ Page

  4. WB1E

    WB1E Ham Member QRZ Page

    Here is some easy reading with drawings. This write up is a decent one by Roy W. Lewallen, W7EL

    Attached Files:

    Last edited: Mar 14, 2018
    W4IOA likes this.
  5. W4IOA

    W4IOA Ham Member QRZ Page

    Best lecture I've ever attended was Roy W7EL presentation on baluns that he gave at WVDX club meeting. That article should be in every hams collection
    WB1E likes this.

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