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.
Ferrite Sampler Pack, Mix 31, RFI Range 1-300 MHz - 25 filters- 1.4" ID Ring, Snap on 1/4, 3/8, 1/2, 3/4, 1, Slip On 1/2, 1/4
The Ferrite Snap On, Ring and slip on sampler Pack is a convenient solution for
troubleshooting RFI/EMI with various diameter cables ranging from 1/4″
to 1.4″ for use as either single turn or multiple turn ferrite chokes using ferrite rings, slip on beads and snap on beads.
The filters are useful for RF coax, AC/DC power cables, and device interconnection cables.
Always use a snap on or ring with a larger inside diameter than the diameter of the cable and use multiple turns if possible (2 turns through the snap on is the same as 4 snap ons with 1 turn). Included in these combo packs are our most popular snap on sizes as follows:
Combo Pack includes the following:
F240-31 ring – 1.4 inch ID – 2 pieces
FSB31-1/4 – 1/4 inch ID – 4 pieces
FSB31-3/8 – 3/8 inch ID – 4 pieces
FSB31-1/2 – ½ inch ID – 4 pieces
FSB31-3/4 – 3/4 inch ID – 2 pieces
FSB31-1 – 1 inch ID – 1 pieces
FB102-31 - 1/2 inch ID slip on bead - 4 pieces
FB56-31 - 1/4" ID slip on bead - 4 pieces inch
Normal Retail price is $127 for these parts
