12:1 Baluns/Ununs

442283848 - 12:1 Baluns/Ununs
+3

FB68-31 - 3/8" ID, RFI Range 1-300 MHz

FB68-31
$1.75
In stock
1
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .687/17.45
ID (B) - in/mm: .375/9.5
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 1 MHz): 27
Z (ohms per bead - single turn 5 MHz): 69
Z (ohms per bead - single turn 10 MHz): 89
Z (ohms per bead - single turn 25 MHz): 138
Z (ohms per bead - single turn 100 MHz): 225
Z ohms (per bead - single turn 250 MHz): 265

Ferrite Slip On Bead, ID = .375in/9.5mm, 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.