{"id":16202,"date":"2025-12-27T18:56:22","date_gmt":"2025-12-27T13:26:22","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16202"},"modified":"2025-12-27T18:56:23","modified_gmt":"2025-12-27T13:26:23","slug":"winding-input-transformer-for-hf-linear-amplifier","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/winding-input-transformer-for-hf-linear-amplifier\/","title":{"rendered":"Winding input transformer for HF linear amplifier"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/pVtayI5ezSo?si=jyY-bERil2jW3hzt\" 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\">This is as per VU2EVQ design. Take 25 cm and 10 cm of 25 SWG winding wire used in submersible motor. Make 3 turns using the 25 cm long wire by passing through BN43-202 core. This is the primary winding of the input transformer. Wind a single turn using the 10 cm long piece. That becomes the secondary winding. Make sure the winding is tight and you have not damaged the insulation of wire. After winding check that the primary and secondary are isolated by using multimeter set in continuity mode.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>BN43-202<\/strong> is a popular &#8220;binocular&#8221; (two-hole) ferrite core made from <strong>43 Material<\/strong>. This core is a &#8220;gold standard&#8221; for amateur radio and RF hobbyists because it is highly versatile for broadband applications.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Specifications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Material:<\/strong> 43 (Nickel-Zinc ferrite).<\/li>\n\n\n\n<li><strong>Permeability (<strong>\u03bc<sub>i<\/sub><\/strong>):<\/strong> 800\u2013850.<\/li>\n\n\n\n<li><strong>Dimensions:<\/strong><\/li>\n\n\n\n<li><strong>Length:<\/strong> 14.35 mm (0.565&#8243;)<\/li>\n\n\n\n<li><strong>Width:<\/strong> 13.30 mm (0.525&#8243;)<\/li>\n\n\n\n<li><strong>Height:<\/strong> 7.50 mm (0.295&#8243;)<\/li>\n\n\n\n<li><strong>Hole Diameter:<\/strong> 3.80 mm (0.150&#8243;)<\/li>\n\n\n\n<li><strong>Inductance Factor (A<sub>L<\/sub>):<\/strong> Typically <strong>2200\u20132890 <em>mH<\/em>\/1000 turns<\/strong> (depending on the specific manufacturer test methods).<\/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\">Common Applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The binocular shape allows for high coupling between windings, making it ideal for:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Broadband Transformers:<\/strong> Used in the 1\u2013500 MHz range. It is the go-to core for small QRP (low power) antenna baluns and ununs.<\/li>\n\n\n\n<li><strong>RF Power Amplifiers:<\/strong> Frequently used in the output stages of HF (High Frequency) amplifiers to match low-impedance transistors to 50 ohm systems.<\/li>\n\n\n\n<li><strong>EMI\/RFI Suppression:<\/strong> Effectively suppresses common-mode noise on data or power lines in the 25\u2013300 MHz range.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Performance Ranges<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Application Type<\/th><th>Frequency Range<\/th><\/tr><\/thead><tbody><tr><td><strong>Wideband Transformers<\/strong><\/td><td>5 \u2013 400 MHz<\/td><\/tr><tr><td><strong>Power Transformers<\/strong><\/td><td>0.5 \u2013 30 MHz<\/td><\/tr><tr><td><strong>RFI Suppression<\/strong><\/td><td>5 \u2013 500 MHz<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Design Tip<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When winding this core, one &#8220;turn&#8221; is defined as the wire passing through <strong>both<\/strong> holes (forming a U-shape). Because of the high <strong>A<sub>L<\/sub><\/strong> value, you often only need 1 or 2 turns for HF applications.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is as per VU2EVQ design. Take 25 cm and 10 cm of 25 SWG winding wire used in submersible motor. Make 3 turns using the 25 cm long wire by passing through BN43-202 core. This is the primary winding of the input transformer. Wind a single turn using the 10 cm long piece. That [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16212,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16202","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>Winding input transformer for HF linear amplifier - 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\/winding-input-transformer-for-hf-linear-amplifier\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Winding input transformer for HF linear amplifier - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"This is as per VU2EVQ design. Take 25 cm and 10 cm of 25 SWG winding wire used in submersible motor. Make 3 turns using the 25 cm long wire by passing through BN43-202 core. This is the primary winding of the input transformer. Wind a single turn using the 10 cm long piece. 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