Power Line filters


    The alfa motor controller is inside a huffman box. There a few cables that come out to the motor as well as the ac power line. While testing the rfi created by the  controller we  noticed lots of rfi coming out the power line. The box was using a corcom   6EF2F power line filter.  A preliminary sweep of this filter from 0 to 2 ghz using a synthesize and spectrum analyzer showed that the filter worked well up to about 200 MHz. Above that, the filter rejection went from about -40db to -8db around lband.
    These fitlers are used in a number of huffman boxes on site. We need to figure a way to improve these filters since many of the devices in the huffman boxes have computers that are running at multiple ghz frequencies.

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