RFI Kit for Radio Transceivers
Purpose
The RFI kit is designed to be installed on your radio transceiver to reduce
Radio Frequency Interference (RFI) caused by common mode current on the
outside of the coax braid at the output of your radio and AC/DC power
cable. Additional chokes are included to reduce common mode currents on 3
more transceiver cables including computer control, audio and another.
This kit will help reduce or eliminate:
-
“Hot mic” RFI caused by poor grounding of antennas or common mode
currents from linear amps feeding unbalanced (coax fed) antennas without
baluns/line isolators.
-
RFI to neighbor’s electronic devices including audio/video systems,
computers, telephones, garage door openers, etc.
- RFI to your other radios, audio/video systems, computers, telephones, etc.
A side benefit is a reduction in noise floor in your receiver depending on
the amount of noise being introduced by common mode currents (which are
blocked/reduced by the chokes in this kit).
These chokes use a special mix of ferrite core material that is effective
in suppressing radio frequency interference from transmitters and high noise
floor on receivers.
The split beads beads are easy to use, don’t require modification of the
protected equipment and work in almost all cases, even when plug-in filters
fail.
Use of the chokes often helps cure SWR problems between transceiver and a
linear amp and between transceiver and antenna tuner or direct to antenna.
The DC power line choke helps keep common mode current out of the power
line which could cause interference to other devices connected to the same
power line if not suppressed.
Included are the following chokes and installation guidelines:
-
Kit includes 4 large ferrite rings (1.4" ID) for RF antenna connectors, AC
or DC input, large connector cables.
-
10 snap on (1/2" ID) connectors for computer interface, band switching,
rotor control, and other cables.
