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 43 - RFI Range: 25-200 MHz
Mix #W, Material: MnZn, Initial Permeability: 10000
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FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz
FT140-43, ID=.9", OD=1.4", RFI Range 25-300 MHz
SKU F140-43
List price $4.50
Save 14%
$3.89
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FT240-43, ID=1.4", RFI Range 25-300 MHz, Case of 100
FT240-43, ID=1.4", RFI Range 25-300 MHz, Case of 100
SKU F240-43-100
List price $1,000.00
Save 21%
$795.00
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