Ferrite cores are designed to block destructive analog radio frequency interference on signal cables and power cords. Given the penetration of digital, High Definition Multimedia Interface (HDMI) cabling with flat screen televisions, the need for ferrite beads on these cables is less than in the days of analog equipment. However, ferrite beads are useful on power cords, which can serve as antennas for RF intrusion. Adding a ferrite bead or two is an inexpensive yet effective tweak any flat panel owner can perform. Tips Writer Bio
