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.
FSB31-1/4, ID=1/4"/6.3mm, RFI Range 1-300 MHz
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .788/20
ID (B) - in/mm: .26/6.6
Length (C) - in/mm: 1.55/39.4
Z (ohms per bead - single turn 1 MHz): 28
Z (ohms per bead - single turn 5 MHz): 83
Z (ohms per bead - single turn 10 MHz): 105
Z (ohms per bead - single turn 25 MHz): 180
Z (ohms per bead - single turn 100 MHz): 310
Z ohms (per bead - single turn 250 MHz): 240
Ferrite Snap On, ID = .26 in/6.6mm, Mix 31
Excellent for RFI/Noise reduction for AV cable, Coaxial Audio, Audio Power Line, IP Serial Port Camera, Computer USB, etc.,