12:1 Baluns/Ununs

442300399 - 12:1 Baluns/Ununs
+2

FSB31-3/8, ID=3/8", 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 FSB31-3/8-10
$33.75
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List price $37.50
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FSB31-3/8, ID=3/8", 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: FSB31-3/8
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .354/9.0
OD (A) - in/mm: .933/23
ID (B) - in/mm: .354/9
Length (C) - in/mm: 1.55/39.4
Z (ohms per bead - single turn 1 MHz): 18
Z (ohms per bead - single turn 5 MHz): 50
Z (ohms per bead - single turn 10 MHz): 81
Z (ohms per bead - single turn 25 MHz): 144
Z (ohms per bead - single turn 100 MHz): 240
Z ohms (per bead - single turn 250 MHz): 270

Ferrite Snap On, ID = .354 in/9mm, Mix 31, pack of 10 pieces for RG-8X, cables up to 3/8" OD

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581498110 - 12:1 Baluns/Ununs
FSB31-3/8, ID=3/8", RFI Range 1-300 MHz, Bulk Pack of 50
FSB31-3/8, ID=3/8", RFI Range 1-300 MHz, Bulk Pack of 50
SKU FSB31-3/8-50
List price $187.50
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$149.95
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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.