Ferrite Ring Toroid Core, ID = .9"/23mm, OD= 1.4"/35.6mm Mix 61 - Replacement for uncoated Ferroxcube/Phillips TX36/23/15-4C25. This listing is for a bulk pack of 10.
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).