12:1 Baluns/Ununs

FSB31-1.5, ID=1.465", RFI Range 1-300 MHz

SKU FSB31-1.5-1
$49.95
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FSB31-1.5, ID=1.465", RFI Range 1-300 MHz
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: 1.394/35.4
OD (A) - in/mm: 2.445/62.1
ID (B) - in/mm: 1.465/37.2
Length (C) - in/mm: 2.5/63.5
Z (ohms per bead - single turn 1 MHz): 60
Z (ohms per bead - single turn 5 MHz): 90
Z (ohms per bead - single turn 10 MHz): 150
Z (ohms per bead - single turn 25 MHz): 190
Z (ohms per bead - single turn 100 MHz): 490
Z ohms (per bead - single turn 250 MHz): 530

Note this "split bead" comes in two halves which are tie wrapped or taped together. Due to the longer length of the split bead halves, the impedance is higher than other similar mix split beads. Useful for large bundles of wire or cables or coaxial feed lines.

Price shown is for the 2 parts of the ferrite


This item is not stock, please allow up to 2 weeks for delivery depending on quantity and availability.

12:1 Baluns are useful between 600-650 ohm balanced loads the impedance at the  end of the feed line is 600 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic,  T2FD and traveling wave antennas.

12:1 Ununs are useful between coax and long wires with a load impedance near 600 ohms like a beverage antenna.  Shortwave listener antennas also can benefit with the 12:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.