The article discusses the different types of noise - galactic, atmospheric and man-made and shows how they effect reception on the MF and HF Bands.
LED noise is one of many EMC problems that beset Amateur Radio. Other noise sources include broadband, solar panels and cheap domestic appliances imported from the far east. Small active (receive only) antennas offer one way to reduce EMC at home QTHs. Most up-market transceivers have separate receive only inputs and some others have simple converter kits.
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