How does a hum eliminator work?
Ground loop current which flows through the shield of coax video cable produces a magnetic field in the core of the hum eliminator. This creates an inductor, or choke. At power frequencies, the high impedance of this choke in the ground path effectively blocks the hum from passing through the unit. The video signal, on the center conductor, is shielded from this choke (by the cable’s ground shield) and passes through the unit unaffected.
