These baluns and ununs can be used for impedance matching and also as End Fed halfwave antenna matching transformers to 50 or 75 ohm coax cable.
FB102-61 - 1/2" ID, RFI Range 200-2000 MHz
Product Details
Initial Permeability (@ 10KHz): 125
Material: NiZn
Max cable size - in/mm: .5/12.6
OD (A) - in/mm: 1.02/25.9
ID (B) - in/mm: .505/12.8
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 100 MHz): 190
Z ohms (per bead - single turn 250 MHz): 300
Z (ohms per bead - single turn 500 MHz): 380
Z (ohms per bead - single turn 1000 MHz): 400
Ferrite Slip On Bead, ID = .505in/12.8mm, Mix 61, 1 piece