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  • CQ Amateur Radio

    The Ferrite-Sleeve Autotransformer

    Dec 01, 2020 2 minutes
    BY RICK LITTLEFIELD,* K1BQT

    ferrite-sleeve autotransformer is a quick, cheap, and easy way to match your antenna to your feedline. It works with a wide range of antenna types including various dipoles, loops, quads, Yagis, and verticals. The autotransformer is unique in that it uses a single-coil winding, a portion of which is common to both the primary and the secondary (see ). The two design variations) cover 3 to 30 MHz with 22 transformation ratios that match loads between 8 and 313 ohms.

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