12:1 Baluns/Ununs

442300472 - 12:1 Baluns/Ununs
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FSB31-1, ID=1", RFI Range 1-300 MHz, Bulk Pack of 10

Store/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHz
SKU FSB31-1-10
$169.50
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List price $195.00 Save 13%
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FSB31-1, ID=1", RFI Range 1-300 MHz, Bulk Pack of 10
Store/Ferrite Core Products/Mix 31/Snap On - Mix 31 - RFI Range 1-300 MHz
Product Details
MPN: FSB31-1
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: 1.0/25.4
OD (A) - in/mm: 2.22/56.4
ID (B) - in/mm: 1.02/25.9
Length (C) - in/mm: 1.69/41.9
Z (ohms per bead - single turn 1 MHz): 45
Z (ohms per bead - single turn 5 MHz): 90
Z (ohms per bead - single turn 10 MHz): 125
Z (ohms per bead - single turn 25 MHz): 218
Z (ohms per bead - single turn 100 MHz): 375
Z ohms (per bead - single turn 250 MHz): 340
Case/Box lot size: 36

Also known as Big Clamp On. Very useful for AC/DC power, coax cable, etc. Use multiple turns for best results or multiple chokes in series (recommended for large amperage power cables). Always put +/- dc cables through the same ferrite filter so their fields cancel and the ferrite suppresses the common mode current on each cable.. Bulk pack of 10

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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.