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CAPTOR,

CURTIS INDUSTRIES,

AVX Corp.,
Ceramite,
Coilcraft,
CORCOM,
Delta,
Filter Concepts,
MPE Ltd.,

RFI Corporation,
Zerosurge

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NOTES ON A.C. POWER LINE FILTERS:
Power line filters are devices that block undesireable radio signals from coming into or out of your product through its power cable. Power line filters do this while allowing the intended current, in this case alternating current, to pass through relatively unimpeded. Most power line filters are "Low Pass" filters. This means that they block high frequencies and allow low ones to pass through. Power line filters are analog, not digital, devices. They do not suddenly cut off above a certain frequency. Instead, as frequencies get higher and higher, the filters will "attenuate" (reduce) them more and more, eventually reaching a maximum amount. This maximum amount of attenuation can reach a factor of 10,000 to 1 or more. In the United States, most power line filters are designed to pass power line frequencies of 60 cycles per second (also called 60 "Hertz" or 60 Hz.) In some cases, the power line frequency can be 50 Hz or 400 Hz. Power line filters are also rated by the amount of current they can handle. Some can only handle 1 ampere of current, others can handle 30 amperes or more. If you try to pass 30 amperes through a 1 ampere filter, the filter can heat up and short out or cause a fire. It is important to consult the manufacturer before selecting a power line filter for your product. Many of the manufacturers on this page have technically knowledgeable sales people for this purpose.
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