Balun Toroid

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Toroid for use as HF/VHF balun, unun

A professional-grade core selected and tested by SOTABEAMS for 125 Watt 1:1 and 4:1 baluns; 3 - 50 MHz.

For higher power use, the cores can be stacked.


Toroid cores are brittle so avoid banging them against hard surfaces.


Toroid core weight = 14 grams

OD = 29 mm ID = 19 mm

Equivalent to type 43 material


Typical Application

1:1 Baluns should be wound as shown in the diagram below.

Each pass through the hole in the toroid is a turn.

For 50MHz 3 + 2 turns of RG58 is recommended.

For HF 7 +6 turns of RG174 is recommended.

Hold the ends in place with cable ties.





6 Reviews Hide Reviews Show Reviews

  • 5
    Balun Toroid

    Posted by Alan Webb on 27th Jan 2019

    I like to make my own dipoles etc and having purchased these Toroid’s I find them very useful and can take up to 100w . Fast delivery. Recommended

  • 5
    Useful Torroid

    Posted by Nick on 20th Oct 2017

    I bought this to make my own 9:1 UnUn for my end-fed wire antenna. It was big enough to get the necessary number of turns which was helpful. Basically it just works! The UnUn tames the impedance so that I can tune 160 - 12 m. I would certainly buy it again.

  • 5
    Good price, good funktion.

    Posted by Jenny Östlund on 7th Feb 2017

    I have used some of these rings instead for FT 118-43 and it seems to be similar values.

  • 5

    Posted by john mcnerlin on 4th Apr 2016

    This is the real deal, good quality toroids at the right price.They come well packaged ready for my project.

  • 4
    As expected

    Posted by Pedro, CT1DBS on 16th Feb 2016

    The toroid do the job. Not a fake toroid as many in today's market!

    1:1 to 1:1.3 from 3.5 to 28 Mhz.

    Happy with it and I would buy again if necessary.

  • 5
    Balun core

    Posted by Unknown on 7th Jan 2016

    Just the job.
    Light weight and easy to wind.

    Gave a 1:1 on 80m with no real measurable return current.
    1.3:1 on 10m both at 100W
    Happy with that.

    Would recommend this core to others