Empire State Filter Co.’s line of hum eliminators is designed to remove
interference created by long cable runs, 60 cycle power demands, grounding noise,
and magnetic coupling. Normal voltage differences between system grounding points
cause small AC power currents to flow through video cables. At power frequencies, a
voltage drop of only 7mV peak can cause a visible hum bar. This ground loop current
flows through the shield of the video cables which produces a magnetic field in the
core of the hum eliminator to create an inductor, or choke. The high impedance of this
choke in the ground path effectively removes the hum from the signal cable at the
output port of the unit. The major advantage of a hum eliminator is high bandwidth.
The low frequency response extends to DC, avoiding an effect called field-rate tilt,
and the high frequency response of more than 200 MHz make these units suitable for
high definition and projection TV systems. These are passive devices which require
no external power. Single channel units are designed for composite signals, three
channel units can be used for 3 composite signals or RGB, Y R-Y B-Y signals.
Models are also available with an internal audio isolation transformer to remove both
audio and video interference

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