PA0FRI Unbalanced/Balanced ATU Project

By F5NPV

The PA0FRI Unbalanced/Balanced ATU is a home-built antenna tuner designed to efficiently match a W8JK 2-element beam antenna fed with a 450-ohm twin lead. Based on PA0FRI’s S-Match design, it optimizes energy transfer while maintaining balance, reducing losses, and ensuring proper radiation. The tuner uses a roller inductor, air variable capacitors, and a T200 iron powder coil, allowing fine-tuning across 14-50 MHz. Extensive lab tests confirm minimal attenuation and precise impedance matching, making it a reliable and efficient ATU for balanced antennas.

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Antennas/Tuners

The title of the main category is Tuners and it deals mainly with Homebrewing antenna tuners. The resource has been on our site since Thursday Feb 20 2025, and it has been viewed 21 times. So far no one has rated it yet. Be the first to rate it!
Last updated: 2025-02-20

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