Power Line filters

dec11

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.

Corcom data sheet for the filter

Notice that they only show the results up to 30MHz.

Dana did a more detailed filter test (.pdf)

sweep of filter before mods.
sweep after some mods that dana made.

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