61mm Ferrite Toroid Core Pack For Ham Radio Gear, 2 Pieces, Toroidal Ring 2.40 Inch OD X 1.40 Inch ID X 0.50 Inch Thick, Great For Balun Unun, Common Mode Choke EMI RFI Noise Filter, HF Antenna Solar Inverter

61mm Ferrite Toroid Core Pack for Ham Radio - 2pcs
✔️ OD 2.40 in (61.0 mm) ID 1.40 in (35 mm) Ht 0.50 in (12.7 mm) AL ≈ 6800 nH/N²

These precision ferrite toroid cores come as a 2-piece pack, ideal for building baluns, common-mode chokes, and EMI/RFI filters in ham radio gear, HF antennas, and related power or data lines.

✅ 2 pieces per pack
✅ OD 2.40 in (61.0 mm) and ID 1.40 in (35 mm), height 0.50 in (12.7 mm)
✅ AL ≈ 6800 nH/N² (1 kHz, 0.3V, 20Ts) tested
✅ Uncoated ferrite core with smooth edges, ready for winding
✅ Works with standard coax (RG58/RG8X) and magnet wire windings
✅ Tested for 9:1 unun & HF choke builds; EMI suppression in multiple setups

💡 What is a 61mm ferrite toroid core pack used for in RF filtering and EMI suppression?

This handy explanation shows why it's a handy choice for RF work.

1. handy for HF balun and unun builds in ham radio projects
2. effective for common-mode chokes that reduce EMI on solar inverters and USB cables
3. works with standard coax winding patterns for easy DIY projects
4. two-piece pack provides flexible options for multiple winding configurations
✝️