12:1 Baluns/Ununs

442300391 - 12:1 Baluns/Ununs
+3

FSB31-3/4, ID=3/4", RFI Range 1-300 MHz

FSB31-3/4-1
$6.95
In stock
1
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .728/18.5
OD (A) - in/mm: 1.15/29.2
ID (B) - in/mm: .74/18.8
Length (C) - in/mm: 1.65/41.9
Z (ohms per bead - single turn 1 MHz): 16
Z (ohms per bead - single turn 5 MHz): 48
Z (ohms per bead - single turn 10 MHz): 89
Z (ohms per bead - single turn 25 MHz): 125
Z (ohms per bead - single turn 100 MHz): 220
Z ohms (per bead - single turn 250 MHz): 310
Case/Box lot size: 110

Ferrite Snap On, ID = .74 in/18.8 mm, Mix 31

# Turns of RG-8X = 4

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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.