https://kd3ee.johnflinchbaugh.com/tags/random-wire/ Recent content in Random Wire on John Flinchbaugh KD3EE Hugo en Tue, 13 May 2025 00:00:00 +0000 https://kd3ee.johnflinchbaugh.com/post/2025-05-13-64-1-unun-for-80m-efhw/ Tue, 13 May 2025 00:00:00 +0000 https://kd3ee.johnflinchbaugh.com/post/2025-05-13-64-1-unun-for-80m-efhw/ <p>Today I experimented with building a 64:1 unun for an 80-meter EFHW.</p> <p>My initial attempt involved 3 primary / 24 secondary windings, but I quickly found that this took up too much space on the small toroid I was using.</p> <p>After some adjustments, I settled on a 2 primary / 16 secondary windings, adding a 100pF capacitor. This configuration was inspired by resources like <a href="https://km1ndy.com/diy-linked-efhw-64-to-1-antenna/">KM1NDY&rsquo;s DIY linked EFHW 64:1 antenna guide</a>.</p> <p>I&rsquo;m now successfully running my home EFHW antenna on 40 meters without needing a tuner. On 17 meters, the SWR is a bit high, so I engage the tuner for that band.</p> <p>This setup reminds me a lot of my previous 71-foot random wire antenna with a 9:1 balun. I&rsquo;m noticing a significant increase in the number of signals I&rsquo;m receiving, which suggests this new EFHW might be a considerable improvement over my old 107-foot EFRW.</p>