FT240-43 Toroid Ferrite Core – HF Noise Suppression for Amateur Radio
Take your radio setup to the next level with the FT240-43 toroid ferrite core — a proven performer for reducing RF interference and improving signal quality in HF (high-frequency) bands.
Whether you're building a common mode choke, a balun, or a high-efficiency RF transformer, the FT240-43 is the trusted choice among amateur radio operators worldwide.
Why Choose the FT240-43?
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Outer Diameter: 2.4 inches (61mm)
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Material Mix: Type 43 – optimized for 1–50 MHz
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Frequency Focus: Best for HF bands (1.8–30 MHz)
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Large inner hole: Easily accommodates multiple turns of coaxial cable or wire
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Applications:
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HF common mode chokes
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End-fed antenna systems
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Baluns & ununs
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RF transformers
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Noise filters for coax or speaker wire
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Ideal for eliminating RFI and improving SWR in HF setups.
Typical Uses
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Suppress common mode currents on coaxial feedlines
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Build effective baluns to match impedance and reduce noise
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Improve signal clarity and reduce hash from local electronics
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Construct RF transformers and inductors with high Q and low loss
Product Features
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Premium-grade Type 43 ferrite material
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Smooth finish for easy winding
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Suitable for RG-58, RG-8X, speaker wire, ladder line, and more
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Supports both DIY builds and professional installations
Technical Specs
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Outer Diameter (OD): 61mm (2.4")
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Inner Diameter (ID): 35.55mm (1.4")
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Height: 12.7mm (0.5")
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Material: #43 or equivalent
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Frequency Range: 1 MHz – 50 MHz (ideal for 1.8–30 MHz use)
Local Stock – Fast Shipping New Zealand-Wide
We're proud to stock and ship these cores locally within New Zealand, ensuring fast delivery and support from people who understand amateur radio.
Single units or bulk available
Ideal for club projects, workshops, and home stations
Clean Up Your Signals – Order Today
Ready to reduce noise and improve performance? Add the FT240-43 toroid ferrite core to your cart now and build the quiet, efficient RF station you've always wanted.