The Ultimate FT-140-43 Ferrite Toroid Core for Every Ham Radio DIY Project

Why Choose SANHLSKJ FT-140-43

Eliminate RFI & EMI Interference

This ferrite toroid core converts high-frequency noise into harmless heat, effectively suppressing common mode current. Perfect for clamping onto USB cables, audio lines, or power cords in your home office to stop computer lock-ups and speaker buzz instantly.

Build High-Performance EFHW Antennas

The full FT-140-43 ferrite ring is the ideal core for a 49:1 or 9:1 unun/balun. Its large inner diameter (0.9 inch) provides more winding comfort, easily accommodating 14-16 turns of 18 AWG magnet wire for a resonant end-fed half-wave antenna.

Full 43 Mix HF Performance

Made from authentic 43 material, this toroid core delivers high impedance at 1-200MHz, ensuring low core loss and excellent SWR across all ham bands (80-10m). A reliable alternative to Amidon and Fair-Rite for the discerning radio amateur.

Chip-Free, Intact Cores Every Time

Unlike brittle cores that arrive chipped or broken, your FT-140-43 ferrites are protected in a custom shock-resistant box. you can focus on your DIY radio projects, not on returning damaged goods.

Start Your DIY Ham Project Easily

Whether you're a seasoned ham building a common mode choke for your coax or a newcomer crafting your first portable antenna, this ferrite ring is simple to use. No soldering required, just wrap and go. Start your project today!

• 49:1 Balun for EFHW Antenna: Primary 4 turns, Secondary 28 turns
• 9:1 Unun for Random Wire: Primary 4 turns, Secondary 12 turns
• RFI/EMI Choke for USB Cable: 3-4 turns of cable through core
• Common Mode Choke for Coax: 5-7 turns of RG-316 coax