The simplest, most cost effective feed line choke is a ferrite ring installed as shown in the picture (at the antenna feed point) to stop feed line radiation or at the radio end of the coax to suppress common mode coax noise current on the coax braid.
Great choke for log periodics, HF beams, Transceiver/Amp isolation
Improves antenna pattern by preventing your dipole from becoming a tripole
Suppresses pesky coax braid radiation and RFI
Reduces coax braid common mode current up to -40 dB ( 6 “S” units) on receive
Use one choke for each antenna feed line
Add a double female barrel connector to act as an “extension” of the existing coax.
FB56-31 - 1/4" ID, RFI Range 1-300 MHz
SKU FB56-31-1
$1.65
Bulk pricing available for quantities of 10 units or more
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| Quantity | Price per item | Discount |
| 10 items | $1.50 | 9% off |
| 100 items | $1.25 | 24% off |
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FB56-31 - 1/4" ID, RFI Range 1-300 MHz
Product Details
Initial Permeability (@ 10KHz): 1500
Material: MnZn
Max cable size - in/mm: .25/6.3
OD (A) - in/mm: .562/14/3
ID (B) - in/mm: .25/6.4
Length (C) - in/mm: 1.125/28.6
Z (ohms per bead - single turn 1 MHz): 35
Z (ohms per bead - single turn 5 MHz): 91
Z (ohms per bead - single turn 10 MHz): 119
Z (ohms per bead - single turn 25 MHz): 181
Z (ohms per bead - single turn 100 MHz): 300
Z ohms (per bead - single turn 250 MHz): 280
Ferrite Slip On Bead - ID = .25 in/6.4mm - Mix 31
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