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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