12:1 Baluns/Ununs

FSB31-1/2, ID=1/2", RFI Range 1-300 MHz - Bulk 15 Pack

FSB31-1/2-15
$69.95
In stock
1
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .5/12.7
OD (A) - in/mm: 1.22/31
ID (B) - in/mm: .514/13.1
Length (C) - in/mm: 1.55/5
Z (ohms per bead - single turn 1 MHz): 25
Z (ohms per bead - single turn 5 MHz): 71
Z (ohms per bead - single turn 10 MHz): 100
Z (ohms per bead - single turn 25 MHz): 156
Z (ohms per bead - single turn 100 MHz): 260
Z ohms (per bead - single turn 250 MHz): 260
: 15
: 4.663

Ferrite Snap On, ID = .514in/13.1 mm, Mix 31 - 15 pieces


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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.