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Filters to get rid of inverter noise
I have a so-called "modified sine wave" inverter that is connected to 200+ amp hours of deep discharge battery located in about the center of the house in the basement. About a 30-foot length of #14 wire goes to an outlet box in the shack, down on one end of the house, and provides 110VAC (of a sort) when the power is off and I don't feel like hauling out the generator. :-) Trouble is, whenever I turn on the inverter it spews harmonics all up and down the HF band and makes it difficult to impossible to hear weak signals. I realize that a pure sine wave inverter would mostly alleviate this but that's not gonna happen any time soon... meanwhile is there a filter I can apply to the output of the inverter to round off the corners of the modified sine wave (which is really nothing but a stairstep square wave) and eliminate the worst of the harmonic noise? Thanks... |
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