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.

FT Mix 61 - RFI Range: 200-2000 MHz

Store/Ferrite Core Products/All Ferrite Ring Toroid Cores/FT Mix 61 - RFI Range: 200-2000 MHz

Mix #52, Material: NiZn, Initial Permeability: 250

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F23-61 Ferrite Ring - .12" ID, .229" OD - RFI Range - 200-2000 MHz

SKU F23-61

$0.39

FT114A-61, ID=.75", RFI Range 250-2000 MHz

SKU F114A-61

$4.95

On Sale

FT140-61, ID=.9", RFI Range 200-2000 MHz - Bulk 10 Pack

SKU F140-61-10

List price ~~$38.95~~

Save 10%

$34.95

On Sale

FT140-61, ID=.9", RFI Range 200-2000 MHz - TX36/23/15-4C25 Replacement

SKU F140-61

List price ~~$4.50~~

Save 14%

$3.89

FT240-61, ID=1.4", RFI Range 200-2000 MHz

SKU F240-61-1

$16.95

FT240-61, ID=1.4", RFI Range 200-2000 MHz, Bulk Pack of 10

SKU F240-61-10

$149.90

On Sale

Ferrite Ring Combo Pack, FT140 - .9" ID, 15 Rings - Mix 43, 61, 77, RFI Range .1-2000 MHz

SKU FRCP-140-15

List price ~~$58.35~~

Save 14%

$49.95

Ferrite Ring Combo Pack, FT140 - .9" ID, 6 Rings - Mix 43, 61, 77, RFI Range .1-2000 MHz

SKU FRCP-140-6

$21.95

On Sale

Ferrite Ring Combo Pack, FT240 - 1.4" ID, 10 Rings - Mix 31(4), 61(3), 75(3), RFI Range .15-2000 MHz

SKU FRCP-240-10

List price ~~$139.50~~

Save 14%

$119.95

Ferrite Ring Mini Combo Pack, FT240 - 1.4" ID, 3 Rings - Mix 31, 61, 75, RFI Range .15-2000 MHz

SKU FRCP-240-3

$39.50

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