Ferrite Toroid Core Ferrite Bead FT-240-43 – Large EMI

The FT240-43 Ferrite Toroid Core is a powerful solution for suppressing electromagnetic interference (EMI) and radio frequency interference (RFI) in the 25 MHz to 100 MHz range. Made from mix 43 material, it is specifically designed for mid-frequency RF applications, where interference is common in devices like ham radio setups, coaxial antennas, baluns, power supplies, and audio systems. Whether you're building your own common-mode choke, antenna filter, or looking to reduce conducted EMI in your DIY project, this toroidal core delivers consistent results. The large inner diameter (1.4") makes it easy to wrap multiple wire turns or accommodate thick cable, making it perfect for enthusiasts and professionals alike. Typical Applications: Ham Radio Antenna Feedline RF Chokes DIY Power Supplies and Inverters EMI Filtering for Coax Cables and Signal Lines Noise Reduction in Audio Equipment Electronic Bench Projects & Prototyping FT240-43 is trusted by engineers, ham operators, and makers across the U.S. for its balance of size, performance, and mid-frequency filtering efficiency.

• Wideband EMI Suppression (25–100 MHz): Ideal for general-purpose noise filtering in the mid-frequency range. Effectively suppresses EMI and RFI from 25 MHz to 100 MHz, optimal at 30–50 MHz.
• Perfect for Ham Radio & Antennas: Popular among amateur radio operators for use with coaxial cables, power lines, and feedlines to reduce RF interference in HF and VHF bands.
• Mix 43 Material – Mid-Frequency Optimized: Made of high-quality mix 43 ferrite, offering stable magnetic performance, excellent for common-mode choke coils and RF filtering.
• Large Inner Diameter – Easy to Wind: With a 2.4" outer diameter and 1.4" inner diameter, the FT240-43 fits thick coaxial cables or multiple turns of thinner wires for custom DIY EMI filtering.
• Essential for DIY Electronics Projects: A top choice for makers, engineers, and electronics enthusiasts building power supplies, signal conditioners, or audio systems needing effective noise suppression.