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April 30th 08, 04:21 AM
posted to rec.radio.amateur.homebrew,sci.electronics.design
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Help, Laptop causes FM interference
"amdx" "Phil Allison" "Charles" Switch-mode power supplies are dirty ... lots of harmonic energy. The interference is both radiated and sent back into the ac mains. ** But they don't usually generate energy in the FM broadcast band ( i.e. 88 - 108 MHz) - that is more likely to be due to the CPU and associated high speed circuits inside the PC. Good call Phil, Maybe I didn't say it clearly, but just plugging the ac cord in and holding it near the laptop induces noise on the power line. ( ac cord only, no switching power supply attached) ** Validates my comment completely. .... Phil |
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