Mobile Station RFI Kits

Flex Radio 5000 Transceiver RFI and Noise Reduction Kit, RFI Range 1-60 Mz, 8 Filters

SKU RFI-FLEX-5000
$64.95
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Flex Radio 5000 Transceiver RFI and Noise Reduction Kit, RFI Range 1-60 Mz, 8 Filters
Product Details
MPN: RFI-FLEX-5000
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): 500
RFI Suppression Range (MHz): 1-300 MHz
# Ferrite Filters: 8
Enclosure Size (inches): n/a
Typical Use:: AC/DC power, RF output, 6 additional I/O lines

Flex Radio 5000 RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the coax output (all 3) of your radio, the AC/DC power cable, mic input, USB transverter RX/TX, and 10MHz clock input, speaker, fire wire I/O, and flex wire I/O.

This kit will help reduce or eliminate:

1. “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.

2. RFI to neighbor’s electronic devices including audio/video systems, computers, telephones, garage door openers, etc.

3. 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.

Kit includes 3 2.4" ring filters and 5 1/2" ID split beads and installation instructions.

For additional RFI suppression, use a feed line choke at the antenna feed point to suppress common current on the coax feed line and a coax noise filter at the radio end of the coax to reduce common mode noise.


If you use a linear amplifier use an amplifier RFI kit for additional RFI interference suppression.

Mobile RFI kits work two ways: They suppress RFI from on board computers and other sensing/control devices in your vehicle that may cause your radio to be a VICTIM of RFI, and second they suppress RFI generated by your radio as a SOURCE which may affect your on board computers or other devices.  Mobile operations of HF radios (1-30 Mhz) tend to experience more RFI effects than VHF/UHF mobile stations.  If you have both HF and VHF installations in your vehicles, you may need both kits.

To address separate solutions we have developed two separate RFI kits: one for HF (1.8-300 MHz) mobile installations and another for VHF/UHF (30-1000 MHz) mobile installations.  Each kit uses the appropriate ferrite mix for the frequency range desired.