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.
FT240-61, ID=1.4", RFI Range 200-2000 MHz
| Quantity | Price per item | Discount |
| 10 items | $14.99 | 12% off |
| 50 items | $14.50 | 14% off |
| 100 items | $13.99 | 17% off |
Excellent for high power broadband RF transformers, RFI common mode noise suppression, AC/DC power cable suppression of high frequency harmonics, Ethernet, audio/video interconnect cables. coax cable
All F240 singles (up to 9) individually labelled with specifications for easy identification.