2:1 Baluns/Ununs Ferrite Core Products Store/Ferrite Core ProductsFerrite Rings, Beads & Snap OnsMix 31Mix 31Mix 43Mix 43Mix 52Mix 52Mix 61Mix 61Mix 75Mix 75All Ferrite Ring Toroid CoresAll Ferrite Ring Toroid CoresAll Snap On Split BeadsAll Snap On Split BeadsAll Slip On Ferrite BeadsAll Slip On Ferrite BeadsCombo Ring/Snap on/Slip on Packs - Mix 31, 61, 75 (.1-2000 MHz)Combo Ring/Snap on/Slip on Packs - Mix 31, 61, 75 (.1-2000 MHz)Refine by FiltersClear allFiltersClear allShow itemsShow itemsFerrite Flat Cable RFI/Noise Filter, 1.35" wide slot RFI Range 10-500 MHz, 1 PieceFerrite Flat Cable RFI/Noise Filter, 1.35" wide slot RFI Range 10-500 MHz, 1 PieceSKU FSB43-1.35-1$5.95 Buy Now 2:1 (100:50) Baluns are useful between 50 ohm coax and 100 ohm balanced lines for loops, cubical quads, log periodics and other antennas where the impedance at the end of the feedline is 100 ohms (1/2 wavelength feedline).