{"id":16198,"date":"2025-12-26T16:45:03","date_gmt":"2025-12-26T11:15:03","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16198"},"modified":"2025-12-26T16:45:04","modified_gmt":"2025-12-26T11:15:04","slug":"bn43-7051-binocular-toroid-for-hf-linear-amplifier","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\/","title":{"rendered":"BN43-7051 Binocular Toroid for HF Linear Amplifier"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/hSJfRn557LU?si=A15VFzRW2mFkc56W\" 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\"><strong>BN43-7051<\/strong> is a high-quality <strong>ferrite binocular core<\/strong> (also known as a &#8220;multi-aperture core&#8221;) used in radio frequency (RF) applications.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I bought these from <a href=\"https:\/\/www.qrz.com\/db\/VU2PTI\">VU2PTI<\/a> (<a href=\"https:\/\/www.homebrewradios.com\/\">https:\/\/www.homebrewradios.com\/<\/a>)<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Technical Specifications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This core was specifically designed using <strong>Material 43<\/strong>, a Nickel-Zinc (NiZn) ferrite material that performs best in the medium frequency range.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Permeability (\u03bc<sub>i<\/sub>):<\/strong> 850<\/li>\n\n\n\n<li><strong>Frequency Range:<\/strong> <strong>Wideband Transformers:<\/strong> 5 MHz \u2013 400 MHz<\/li>\n\n\n\n<li><strong>Power Transformers:<\/strong> 0.5 MHz \u2013 30 MHz<\/li>\n\n\n\n<li><strong>RFI Suppression:<\/strong> 5 MHz \u2013 500 MHz\n<ul class=\"wp-block-list\">\n<li><strong>These ranges are listed differently by different sources!<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Dimensions:<\/strong> Approximately 28.7mm x 28.7mm x 14.25mm.<\/li>\n\n\n\n<li><strong>Structure:<\/strong> Two parallel holes (binocular shape) with a diameter of roughly 6.35mm.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Common Applications<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>RF Baluns and Ununs:<\/strong> Often used in amateur radio (Ham radio) for constructing 1:1, 4:1, or 9:1 baluns.<\/li>\n\n\n\n<li><strong>Impedance Matching:<\/strong> Used in the output stages of solid-state RF power amplifiers (up to 200W-300W PEP depending on the design).<\/li>\n\n\n\n<li><strong>EMI\/RFI Suppression:<\/strong> Used as a choke to snap onto cables or wind wires through to reduce electronic noise.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n","protected":false},"excerpt":{"rendered":"<p>BN43-7051 is a high-quality ferrite binocular core (also known as a &#8220;multi-aperture core&#8221;) used in radio frequency (RF) applications. I bought these from VU2PTI (https:\/\/www.homebrewradios.com\/) Technical Specifications This core was specifically designed using Material 43, a Nickel-Zinc (NiZn) ferrite material that performs best in the medium frequency range. Common Applications<\/p>\n","protected":false},"author":1,"featured_media":16199,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16198","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>BN43-7051 Binocular Toroid 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\/bn43-7051-binocular-toroid-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=\"BN43-7051 Binocular Toroid for HF Linear Amplifier - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"BN43-7051 is a high-quality ferrite binocular core (also known as a &#8220;multi-aperture core&#8221;) used in radio frequency (RF) applications. I bought these from VU2PTI (https:\/\/www.homebrewradios.com\/) Technical Specifications This core was specifically designed using Material 43, a Nickel-Zinc (NiZn) ferrite material that performs best in the medium frequency range. Common Applications\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-26T11:15:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-26T11:15:04+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2025\/12\/BN43-7051-Binocular-Toroid-for-HF-Linear-Amplifier.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"BN43-7051 Binocular Toroid for HF Linear Amplifier\",\"datePublished\":\"2025-12-26T11:15:03+00:00\",\"dateModified\":\"2025-12-26T11:15:04+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/\"},\"wordCount\":160,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/BN43-7051-Binocular-Toroid-for-HF-Linear-Amplifier.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/bn43-7051-binocular-toroid-for-hf-linear-amplifier\\\/\",\"name\":\"BN43-7051 Binocular Toroid for HF Linear Amplifier - 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