{"product_id":"ft240-43-toroid-ferrite-core-rf-magnetic-ring-diy-choke-balun","title":"FT240-43 Toroid Ferrite Core RF Choke Balun Magnetic Ring","description":"\n\u003ch2\u003eFT240-43 Toroid Ferrite Core – High-Frequency RF Magnetic Ring\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eFT240-43 Toroid Ferrite Core\u003c\/strong\u003e is a premium-grade nickel-zinc ferrite ring engineered for demanding RF and high-frequency applications. Whether you're building a choke balun, winding an antenna transformer, or assembling DIY RF circuits, this precision toroid delivers stable, consistent magnetic performance you can count on. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Quality Ferrite Construction:\u003c\/strong\u003e Engineered for excellent magnetic properties, ensuring reliable and consistent performance across a wide range of RF applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNickel-Zinc (Ni-Zn) Composition:\u003c\/strong\u003e Delivers superior high-frequency characteristics, making it ideal for efficient signal transmission and minimal loss at elevated frequencies.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise Dimensions:\u003c\/strong\u003e Measures 6.0 × 3.5 × 1.3 cm (outer diameter × height × wall thickness), providing an optimal fit for standard winding configurations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight at Just 95g:\u003c\/strong\u003e Easy to handle and mount, simplifying installation in both bench and field setups.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile RF Use:\u003c\/strong\u003e Perfect for choke baluns, antenna feedlines, common-mode chokes, RF transformers, and other circuits requiring stable magnetic cores.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClassic Black Ferrite Finish:\u003c\/strong\u003e Clean, professional appearance suited for amateur radio, electronics prototyping, and workshop projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eFT240-43\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eNickel-Zinc Ferrite\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e6.0 × 3.5 × 1.3 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e95 g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × FT240-43 Toroid Ferrite Core Magnetic Ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eActual color may vary slightly from product images due to monitor brightness and lighting conditions.\u003c\/li\u003e\n  \u003cli\u003ePlease allow a slight measurement deviation (±1–2 mm) for physical dimensions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-wooden-handle-nylon-bristle-paint-brush-for-oil-painting-dusting-and-cleaning-unrechargeable-hand-tool-set-without-batt-2\"\u003e10Pcs Wooden Handle Nylon Bristle Paint Brush – DIY Hand Tool Set\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-precision-japanese-double-edged-hand-saw-sk5-steel-fine-toothed-for-carpentry-and-gardening-6-inch-blade-portable-mini-1\"\u003e1pc Precision Japanese Double-Edged Hand Saw – SK5 Steel Portable Mini\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-manual-household-yarn-winding-machine-twisting-and-weaving-tools-diy-sewing-accessories-yarn-ball-winder-2\"\u003e1pc Manual Household Yarn Winding Machine – DIY Sewing \u0026amp; Weaving Tool\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the Mix 43 ferrite material best suited for in the FT240-43 toroid core?\u003c\/h4\u003e\n\u003cp\u003eA: The Mix 43 (nickel-zinc ferrite) composition used in the FT240-43 toroid core is optimized for high-frequency RF applications, typically ranging from 1 MHz up to 300 MHz. It is especially well-suited for winding common-mode choke baluns, antenna feedline chokes, and RF impedance transformers, providing excellent attenuation of unwanted common-mode currents while maintaining low insertion loss for the desired signal.\u003c\/p\u003e\n\u003ch4\u003eQ: How many turns of wire can I wind on the FT240-43 toroid?\u003c\/h4\u003e\n\u003cp\u003eA: The FT240-43 has a large 6 cm outer diameter, making it one of the most spacious toroid cores available for amateur radio and DIY RF projects. Depending on the wire gauge used, builders commonly wind 8–12 turns for a classic 1:1 choke balun, or configure multi-turn bifilar windings for various impedance ratios. The generous circumference allows comfortable winding without overcrowding, even with heavier coaxial or enameled copper wire.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this toroid ferrite core suitable for amateur (ham) radio antenna baluns?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the FT240-43 is one of the most popular toroid cores among amateur radio operators worldwide. Its nickel-zinc ferrite properties make it highly effective for HF-band choke baluns and current baluns used on wire antennas, dipoles, and vertical antennas. Its size and inductance characteristics provide high choking impedance across much of the HF spectrum, making it a reliable DIY balun building block.\u003c\/p\u003e\n\u003ch4\u003eQ: What is included in the package?\u003c\/h4\u003e\n\u003cp\u003eA: Each order includes one (1) FT240-43 toroid ferrite core magnetic ring. Wire, connectors, and housing are not included — this is the raw core intended for DIY winding and custom RF circuit assembly.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the Mix 43 ferrite material best suited for in the FT240-43 toroid core?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Mix 43 (nickel-zinc ferrite) composition used in the FT240-43 toroid core is optimized for high-frequency RF applications, typically ranging from 1 MHz up to 300 MHz. It is especially well-suited for winding common-mode choke baluns, antenna feedline chokes, and RF impedance transformers, providing excellent attenuation of unwanted common-mode currents while maintaining low insertion loss for the desired signal.\"}}, {\"@type\": \"Question\", \"name\": \"How many turns of wire can I wind on the FT240-43 toroid?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The FT240-43 has a large 6 cm outer diameter, making it one of the most spacious toroid cores available for amateur radio and DIY RF projects. Depending on the wire gauge used, builders commonly wind 8–12 turns for a classic 1:1 choke balun, or configure multi-turn bifilar windings for various impedance ratios. 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Wire, connectors, and housing are not included — this is the raw core intended for DIY winding and custom RF circuit assembly.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"FT240-43 Toroid Ferrite Core RF Choke Balun Magnetic Ring\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/products\/ft240-43-toroid-ferrite-core-rf-magnetic-ring-diy-choke-balun\"}]}\u003c\/script\u003e","brand":"Babs","offers":[{"title":"1pc","offer_id":52544923992204,"sku":"1126:1583#1pc","price":60.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/2862\/6316\/files\/S0720a0b18c484b90b8011e8eab34e228x.webp?v=1786825748","url":"https:\/\/babcustomersupport.com\/products\/ft240-43-toroid-ferrite-core-rf-magnetic-ring-diy-choke-balun","provider":"Babs","version":"1.0","type":"link"}