--- product_id: 157872753 title: "FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4\" OD, High Permeability) (PACK OF 1)" brand: "amidon" price: "€ 25.86" currency: EUR in_stock: true reviews_count: 8 category: "Amidon" url: https://www.desertcart.hr/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi store_origin: HR region: Croatia --- # 1 kW power handling 2.4" OD large core 20-250 MHz RFI suppression FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) **Brand:** amidon **Price:** € 25.86 **Availability:** ✅ In Stock ## Summary > 🔧 Elevate your RF game with the FT-240-43 – where power meets precision! ## Quick Answers - **What is this?** FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) by amidon - **How much does it cost?** € 25.86 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi) ## Best For - amidon enthusiasts ## Why This Product - Trusted amidon brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built for Power:** Handles up to 1 kW, perfect for demanding HF baluns and impedance transformers. - • **Spacious Design:** 2.4" outer diameter accommodates multiple turns of RG-8, RG-213, or speaker wire effortlessly. - • **Versatile Applications:** Ideal for 1:1, 4:1, 9:1 baluns, common-mode chokes, and appliance noise suppression. - • **Maximize Signal Clarity:** High initial permeability (µi ≈ 850) ensures superior EMI filtering with minimal loss. - • **Reliable Under Pressure:** Thermally stable core maintains performance even in challenging environments. ## Overview The FT-240-43 Ferrite Toroid Core, crafted from premium Mix 43 material, is engineered for effective RFI suppression and high-power HF balun construction. With a large 2.4" diameter, high permeability, and 1 kW power capacity, it supports a broad frequency range (20-250 MHz) and versatile applications, delivering reliable EMI filtering and thermal stability for professional-grade RF projects. ## Description The FT-240-43 Ferrite Toroid Core is a high-performance solution for reducing radio frequency interference (RFI) and building efficient impedance transformers. Made with Mix 43 material, this toroid is ideal for applications in the 20 MHz to 250 MHz range, making it a favorite among ham radio operators, RF engineers, and electronics hobbyists. Its large 2.4-inch outer diameter and high initial permeability (µi ≈ 850) allow for multiple turns of coaxial cable or wire, enabling effective common-mode chokes and broadband EMI filters. Whether you're constructing HF baluns, suppressing appliance noise, or improving antenna performance, the FT-240-43 delivers consistent results with excellent thermal stability and power handling up to 1 kW. OD(A) = 2.40 in / 61.0 mm +/- 1.30 mm ID(B) = 1.40 in / 35.55 mm +/- 0.85 mm Ht(C) = 0.50 in / 12.7 mm +/- 0.50 mm AL=1075 +/- 20 % uH=(AL*Turns2)/1000 Temperature Stability (ppm /°C) = 12500 Color Code = shiny black Application Freq Range Wideband Transformers 5 - 400 MHz Power Transformers 0.5 - 30 MHz RFI Suppression 5 - 500 MHz Review: Toroid Core, very reliable - Great product, works great! Review: Worked as expected. - Great quality, and packaging, ## Features - Mix 43 Ferrite Material Manufactured by Fair-Rite Designed for RFI suppression from 20 MHz to 250 MHz—ideal for HF radio and EMI filtering - Large Core Dimensions 2.4" OD × 1.4" ID × 0.5" height—perfect for winding multiple turns of RG-8, RG-213, or speaker wire. - High Power Handling Supports up to 1 kW—suitable for high-power HF baluns and impedance transformers. - Versatile Applications Use in 1:1, 4:1, or 9:1 baluns, common-mode chokes, End Fed and OCF antennas, and appliance RFI suppression. - High Initial Permeability (µi ≈ 850) Enables strong attenuation of unwanted signals with minimal insertion loss. Thermal Stability Maintains performance under demanding operating conditions. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.7 out of 5 stars 468 Reviews | ## Images ![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 1](https://m.media-amazon.com/images/I/31kaTAxchqL.jpg) ![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 2](https://m.media-amazon.com/images/I/31pD3iabY0L.jpg) ![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 3](https://m.media-amazon.com/images/I/21eTMRmSE6L.jpg) ![FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1) - Image 4](https://m.media-amazon.com/images/I/81AqQXEUpeL.jpg) ## Questions & Answers **Q: Are the north and south poles, axially (top and bottom) or diametrically (side to side)?** A: Your question indicates that you assume this product is a magnet. This product is not a magnet. It is a ferrite core used to construct impedance matching transformers by winding wires repeatedly through the center and tightly wrapped around the edges of core. **Q: works for dash cam radio interference???** A: You can use the clip on type for that as well. Get good ones, not unknown cheap chinese. **Q: Would this help with noise on AM radio? Wrap the antenna wire around and through this?** A: If the antenna wire is just that a wire then you will only decrease the signal and the noise. Find the source of the noise. LED lights, wall plug-in power sources, or other electrical appliances. If you find the source then maybe using snap on ferrite cores. They see these on Amazon also. I found a source for my AM noise was a power supply for a blue tooth adapter I had. After unplugging this the noise went away. If you shield the antenna as using coax and running an outside antenna wire to get away from the noise that might work also, but that depending where you live might not be possible. **Q: what is the dimater of the inner hole?** A: I don't have an ID micrometer handy but an eyeball guess with a desk ruler is about 1 3/8 inch. If you need something more precise or in metric, I can figure that tomorrow. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Toroid Core, very reliable *by H***M on January 20, 2026* Great product, works great! ### ⭐⭐⭐⭐⭐ Worked as expected. *by K***T on September 14, 2025* Great quality, and packaging, ### ⭐⭐⭐⭐⭐ For my antennas. *by D***M on February 23, 2026* I used these to make baluns for my ham radio antennas. They are just as they should be. No issues. ## Frequently Bought Together - FT-240-43 FT240-43 Ferrite Toroid Core 43 Material - BNTECHGO 16 AWG Magnet Wire - Enameled Copper Wire - Enameled Magnet Winding Wire - 4 oz - 0.0492" Diameter 1 Spool Coil Red Temperature Rating 155℃ Widely Used for Transformers Inductors - FT-140-43 Ferrite Toroid Core | 43 Material --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi](https://www.desertcart.hr/products/157872753-ft-240-43-ferrite-toroid-core-mix-43-for-rfi) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-23*