12:1 Baluns/Ununs

442283549 - 12:1 Baluns/Ununs
+3

FB56-31 - 1/4" ID, RFI Range 1-300 MHz

FB56-31-1
$1.65
In stock
1
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .562/14/3
ID (B) - in/mm: .25/6.4
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 1 MHz): 35
Z (ohms per bead - single turn 5 MHz): 91
Z (ohms per bead - single turn 10 MHz): 119
Z (ohms per bead - single turn 25 MHz): 181
Z (ohms per bead - single turn 100 MHz): 300
Z ohms (per bead - single turn 250 MHz): 280

Ferrite Slip On Bead - ID = .25 in/6.4mm - Mix 31

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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.