Got an electronic interference problem on your boat or RV? Do you hear HUM-BUZZ-NOISE when you use the fish finder/radar/GPS/Generator or hear your voice on the stereo speakers when you transmit on the radio? Maybe you heard buzzing or humming when you turned on the battery charger/inverter/generator – any of these symptoms indicate you have RFI issues on your boat or RV and you need to stop it or the HUM-BUZZ-NOISE may drive you nuts!
But you don’t have to worry – We got the fix for you – lots of filters, all in a small box, that are easy to install on the wires of your electronic stuff that is bothered by the RFI.
If you have RFI, you need this kit:
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Boat Owner’s Electronic Interference Suppression Kit Use this filter kit to suppress interference noise between electronic devices on your boat including: radar, fish finders, audio/video systems, inverter noise, solar controllers, vhf radio, marine/ham radio, auto pilots, electronic gauges, PA systems, and many other electronic devices. |
What is included:
A total of 17 Ferrite Ring/Snap-On Filters
Ring: 1.4” ID x 6, Snap on: 3/8” ID x 6, 1/2” ID x 5
Mix 31 Interference Range: 1-300 MHz
AM broadcast transmits on a low frequency with large antennas. Consequently it takes a large antenna to receive the signals. Typical “antennas” are AC house wiring, phone lines, long satellite or cable TV cables, DSL/CAT5 lines running between rooms, etc. The device wires that connect to these “antennas” need to be choked with as many turns through the ferrite as possible. Some installation examples are shown below on this page.
For AC/ DC power cords and coax cables the F240-77 (2.4″ OD, 1.4″ ID) “Donut” toroid is the most popular. Also available are smaller toroid donuts and Mix 77 beads. Shown below is a graph with 8, 10, and 12 turns through the toroid – obviously more turns has higher choking impedance. Mix 77 toroid products are HERE and Mix 77 small beads (for small wires) are HERE
F240-77 Turns Comparison from .1 – 8.1 Mhz
Shown below is a graph of frequency response verses choking magnitude for a F240-77 in the AM Broadcast band for a 12 turn coil around the toroid. (Same info as above but different frequency range).
F240-77 Choking Impedance in AM Broadcast Band
Typical Installations for Donut/Ring Toroids
 AC Cable on F-240 Toroid – 6 turns |
 Ethernet Cable on F-240 Toroid – 7 turns |
 Audio or Mic cable on F240- 12 turns |
Extra Mix 75 Snap On Beads HERE – VERY effective for AM Broadcast RFI