FT-240-43 Ferrite Toroid Core – Mix 43 for RFI Suppression & HF Baluns (2.4" OD, High Permeability) (PACK OF 1)

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

• 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.