{"id":16727,"date":"2026-03-24T17:18:31","date_gmt":"2026-03-24T11:48:31","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16727"},"modified":"2026-03-24T18:25:01","modified_gmt":"2026-03-24T12:55:01","slug":"atu-100-ext-automatic-antenna-tuner","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/atu-100-ext-automatic-antenna-tuner\/","title":{"rendered":"ATU-100 EXT Automatic Antenna Tuner"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/6LF3fBwHJpA?si=XeZax8yAQnWWWGYO\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">The <strong>ATU-100 EXT<\/strong> is the popular &#8220;Extended&#8221; version of David Fainitski\u2019s (N7DDC) open-source automatic antenna tuner. It is widely used by homebrewers because it\u2019s affordable, effective, and handles up to 100W\u2014making it a perfect companion for a 100W HF linear amplifier. Here is a technical breakdown of how the ATU-100 EXT fits into a homebrew station.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Core Specifications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Max Power:<\/strong> 100W (SSB\/CW). For digital modes like <strong>FT8<\/strong>, it is safer to keep it under 50W to avoid overheating the small toroids.<\/li>\n\n\n\n<li><strong>Tuning Range:<\/strong> Typically handles SWR from 1:5 down to 1:1.1.<\/li>\n\n\n\n<li><strong>Minimum Power to Start Tuning:<\/strong> 1\u20135 Watts (Adjustable in firmware).<\/li>\n\n\n\n<li><strong>Inductance\/Capacitance:<\/strong> Uses a 7&#215;7 network (7 capacitors and 7 inductors) switched by relays.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Integration with Homebrew Projects<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you are integrating this into a 100W linear<strong> amplifier <\/strong>build, keep these points in mind:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Placement in the Chain:<\/strong>\n<ul class=\"wp-block-list\">\n<li><code>Rig -> Linear Amp -> LPF -> ATU-100 -> Antenna<\/code>.<\/li>\n\n\n\n<li><strong>Note:<\/strong> Always ensure your Low Pass Filter (LPF) is <em>before<\/em> the ATU if you&#8217;re using a harmonic-rich homebrew amp.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Firmware Customization:<\/strong> * The &#8220;EXT&#8221; version usually comes with an OLED display. You can tweak the <code>cell<\/code> values in the PIC16F1938 firmware if you want to change the &#8220;Auto-tune&#8221; threshold.<\/li>\n\n\n\n<li><strong>Tandem Match (SWR Bridge):<\/strong> * The ATU-100 uses a Tandem Match on a small binocular core. If you find the power readings are inaccurate compared to your external meters, you may need to adjust the turns ratio or the calibration offset in the software.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Common Modifications for Homebrewers<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Relay Power:<\/strong> Ensure your power supply can handle the sudden current spike when all 14 relays click simultaneously during a tuning cycle.<\/li>\n\n\n\n<li><strong>External Control:<\/strong> Many users add a &#8220;Tune&#8221; button to the front panel or a switch to toggle between <strong>Auto<\/strong> and <strong>Manual<\/strong> modes.<\/li>\n\n\n\n<li><strong>Protection:<\/strong> It has been mentioned that you are interested in linear amplifier protection circuitry, you can actually tap the SWR voltage from the ATU\u2019s bridge to trigger a PTT-cut on your amplifier if SWR exceeds 3:1. That seems to be very nice, though I am not very sure on how to implement it for my VU2EVQ linear amplifier!<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Quick Comparison for some of my Antennas<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Antenna Type<\/strong><\/td><td><strong>ATU-100 Performance<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>80m Inverted V<\/strong><\/td><td>Excellent for fine-tuning the band edges.<\/td><\/tr><tr><td><strong>40m Full Loop<\/strong><\/td><td>Works great if the loop is slightly off-resonance.<\/td><\/tr><tr><td><strong>EFHW (49:1)<\/strong><\/td><td>Useful for expanding the bandwidth, but the ATU may struggle if the wire length is a &#8220;worst-case&#8221; impedance for a specific frequency.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The ATU-100 EXT is the popular &#8220;Extended&#8221; version of David Fainitski\u2019s (N7DDC) open-source automatic antenna tuner. It is widely used by homebrewers because it\u2019s affordable, effective, and handles up to 100W\u2014making it a perfect companion for a 100W HF linear amplifier. Here is a technical breakdown of how the ATU-100 EXT fits into a homebrew [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16728,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16727","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ATU-100 EXT Automatic Antenna Tuner - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/atu-100-ext-automatic-antenna-tuner\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATU-100 EXT Automatic Antenna Tuner - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The ATU-100 EXT is the popular &#8220;Extended&#8221; version of David Fainitski\u2019s (N7DDC) open-source automatic antenna tuner. It is widely used by homebrewers because it\u2019s affordable, effective, and handles up to 100W\u2014making it a perfect companion for a 100W HF linear amplifier. 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