Garage Door Opener RFI Kit

Flex Radio 6400/6600 Transceiver RFI and Noise Reduction Kit - 13 Filters with coax noise filter option

SKU RFI-FLEX-6400/6600
$89.95
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Coax Noise Filters
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Flex Radio 6400/6600 Transceiver RFI and Noise Reduction Kit - 13 Filters with coax noise filter option
Product Details
MPN: RFI-FLEX-6400/6600
Type: NEW
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): 500
RFI Suppression Range (MHz): 1-300 MHz
Enclosure Size (inches): n/a
Typical Use:: AC/DC power, RF output(2), 10 additional I/O lines

Flex Radio 6400/6400M, 6600/6600M 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 (2) of your radio, the AC/DC power cable, mic input, USB transverter RX/TX, speaker, ethernet I/O, and additional I/O cables attached to these beautiful radios.

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). You can also choose to add the dual CMNf-500-50 coax common mode noise filters which easily attach to the back panel with double male barrel connectors. Up to 38 dB additional common mode reduction is available with these filters.

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.

This standard kit includes 1 low frequency DC supply filter and 2 coax ring filters (ID=1.4") and 10 1/2" ID split beads and installation instructions or choose the option with dual CMNF-500-50 coax common mode filters in place of the coax ring filters in the standard package.

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. We also have RFI kits for the PGXL amp, the Tuner Genius antenna tuner and feed line chokes for coax feeding the Antenna Genius switch box.

Christmas lights or yard lights with switching DC power supplies are often the RFI source and a clamp on ferrite bead on the AC AND the DC side feeding the lights is needed to help suppress the switching power supply RFI noise.  Suitable snap on beads are FSB31-1/2 for the 1-250 MHz range.

We have also had reported wireless HDTV boxes, and FOSCAM and AMCREST security camera systems causing RFI to garage door remote openers. Use our Garage Door Opener RFI kit to suppress the interference to the opener (VICTIM) – you need one kit for each opener.  Maximize the distance from the camera to the openers may also help.  Additionally shield cable to the garage door sensors may be needed depending on severity of the camera RFI.

Obvious Tech Note: make sure your remote batteries have enough energy to activate the GDO or the signal they transmit may not be large enough to over ride the RFI signal, but a fresh battery may be able to overcome the weak RFI source and allow the GDO to operate correctly.