12:1 Baluns/Ununs

442283787 - 12:1 Baluns/Ununs
+3

FB200-31 - 1" ID, RFI Range 1-300 MHz

FB200-31
$13.95
In stock
1
Product Details
MPN: FB200-31
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: 1/25.4
OD (A) - in/mm: 2.0/50.8 (+/- 1.3mm)
ID (B) - in/mm: 1.0/25.4 (+/- .8mm)
Length (C) - in/mm: 1.5/38.1 (+/- .75mm)
Z (ohms per bead - single turn 1 MHz): 40
Z (ohms per bead - single turn 5 MHz): 103
Z (ohms per bead - single turn 10 MHz): 140
Z (ohms per bead - single turn 25 MHz): 215
Z (ohms per bead - single turn 100 MHz): 365
Z ohms (per bead - single turn 250 MHz): 290

Ferrite Slip On Bead, ID = 1in/25.4mm, Mix 31

Application Note: use 5 turns of 1/4" coax for good feed line choke from 3-30 MHz, 5KW

Also useful for choking DC cables, large coax sleeve chokes

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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.