This RFI kit is designed to suppress RFI caused by FM broadcast transmitters in the range of 88-108 MHz and is useful for RFI signals from 20-250 MHz.
The kit contains large ferrite toroids for the AC/DC power lines and snap on beads for input cables (like mic and mixer input cables) of RFI effected devices.
The 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.
Rings have 1.4″ hole and SNAP ON filters have 1/2″ hole – mix selected for the frequencies of interference. 5 rings, 8 Snap On beads included.
Also make sure you connect a good RF ground to the transceiver ground post.
Note to Flex Radio users: Use snap on ferrites for firewire cable, speaker cable and mic cable, Ring ferrites for Antenna output and DC power.
For additional RFI suppression, use a feed line choke at the antenna to suppress common current on the coax feed line – see our store for feed line choke alternatives for use at the antenna.
If you use a linear amplifier we have RFI kits for linear amplifiers that help suppress RFI in your shack or in your neighbor’s house.