{"id":10674,"date":"2026-02-09T02:00:00","date_gmt":"2026-02-09T01:00:00","guid":{"rendered":"https:\/\/www.ik0vve.net\/?p=10674"},"modified":"2026-02-02T08:51:07","modified_gmt":"2026-02-02T07:51:07","slug":"pills-of-technique-the-magnetic-loop-small-size-big-performance","status":"publish","type":"post","link":"https:\/\/www.ik0vve.net\/?p=10674","title":{"rendered":"\u201cPills of Technique\u201d: The Magnetic Loop \u2013 Small size, Big Performance!"},"content":{"rendered":"\n<p>Do you have a small balcony or a &#8220;no-antenna&#8221; policy in your building? Don\u2019t give up on HF! The <strong>Magnetic Loop<\/strong> (or Small Transmitting Loop) is a compact solution that defies common sense: it\u2019s small, but it works surprisingly well.<\/p>\n\n\n\n<h3>1. What is a Magnetic Loop?<\/h3>\n\n\n\n<p>A Magnetic Loop is a ring of thick conductor (copper pipe, aluminum, or even thick coax) with a circumference usually less than <strong>1\/4 wavelength<\/strong>. Unlike standard antennas, it interacts primarily with the <strong>magnetic field<\/strong> of the radio wave.<\/p>\n\n\n\n<ul>\n<li><strong>The Big Loop:<\/strong> The main antenna.<\/li>\n\n\n\n<li><strong>The Small Loop:<\/strong> A smaller ring (1\/5 the size of the big one) used to &#8220;inject&#8221; the signal (the feedlink).<\/li>\n\n\n\n<li><strong>The Capacitor:<\/strong> A variable capacitor used to &#8220;tune&#8221; the antenna to the exact frequency.<\/li>\n<\/ul>\n\n\n\n<h3>2. Why is it special?<\/h3>\n\n\n\n<ul>\n<li><strong>High Q (Selective):<\/strong> It acts like a very sharp filter. It reduces noise from nearby electronics and only &#8220;listens&#8221; to a very narrow frequency.<\/li>\n\n\n\n<li><strong>Compact:<\/strong> A loop for 20 meters is only about 1 meter in diameter!<\/li>\n\n\n\n<li><strong>No Ground Needed:<\/strong> Unlike vertical antennas, it doesn&#8217;t need radials to work.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image.png\"><img decoding=\"async\" loading=\"lazy\" width=\"768\" height=\"1024\" src=\"https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-768x1024.png\" alt=\"\" class=\"wp-image-10675\" srcset=\"https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-768x1024.png 768w, https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-225x300.png 225w, https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-1152x1536.png 1152w, https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-1536x2048.png 1536w, https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image-1024x1365.png 1024w, https:\/\/www.ik0vve.net\/wp-content\/uploads\/2026\/02\/image.png 1920w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/a><figcaption class=\"wp-element-caption\">My homemade Magnetic Loop<\/figcaption><\/figure>\n\n\n\n<h3>3. The &#8220;Danger&#8221; and the Challenge<\/h3>\n\n\n\n<ul>\n<li><strong>High Voltage:<\/strong> Even with only 10 Watts, the voltage across the capacitor can reach <strong>thousands of Volts!<\/strong> Never touch the antenna while transmitting.<\/li>\n\n\n\n<li><strong>Sharp Tuning:<\/strong> Since the antenna is very selective, you need to retune the capacitor every time you move even a few kHz on your radio.<\/li>\n<\/ul>\n\n\n\n<h3>4. Deepening and Technical Resources<\/h3>\n\n\n\n<ul>\n<li><strong><a href=\"https:\/\/www.66pacific.com\/calculators\/small-transmitting-loop-antenna-calculator.aspx\" target=\"_blank\" rel=\"noreferrer noopener\">66 Pacific &#8211; Magnetic Loop Calculator<\/a>:<\/strong> Enter your diameter and power to see the required capacitor value and the expected efficiency.<\/li>\n\n\n\n<li><strong><a target=\"_blank\" rel=\"noreferrer noopener\" href=\"http:\/\/www.aa5tb.com\/loop.html\">Steve Yates AA5TB &#8211; Small Transmitting Loop<\/a>:<\/strong> One of the most famous and detailed websites about loop theory and practice.<\/li>\n\n\n\n<li><strong><a rel=\"noreferrer noopener\" href=\"https:\/\/www.ik0vve.net\/?p=10437\" target=\"_blank\">DK6MAX &#8211; My Korean Loop<\/a>:<\/strong> Check out my own DIY project and see how a magnetic loop looks in real life!<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><strong>Pro Tip:<\/strong> Because the Magnetic Loop is so sharp (High Q) and bidirectional, you can use it to &#8220;null out&#8221; a local source of interference. Just rotate the antenna until the noise disappears \u2013 it works like a charm!<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Next Step:<\/strong> Now that we\u2019ve explored the &#8220;small&#8221; world, let\u2019s go back to the ground. In the next pill, we will talk about <strong>Ground-Mounted Verticals and Buried Radials<\/strong>: the best way to be &#8220;invisible&#8221; in your garden!<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Do you have a small balcony or a &#8220;no-antenna&#8221; policy<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[179,204,202,168,203],"tags":[180,201,165,169,200],"_links":{"self":[{"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/posts\/10674"}],"collection":[{"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10674"}],"version-history":[{"count":6,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/posts\/10674\/revisions"}],"predecessor-version":[{"id":10681,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=\/wp\/v2\/posts\/10674\/revisions\/10681"}],"wp:attachment":[{"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10674"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10674"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ik0vve.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10674"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}