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E4E10

What is a common characteristic of interference caused by a touch controlled electrical device?

SelectAnswer
AAll of these choices are correct
BThe interfering signal may drift slowly across the HF spectrum
CThe interfering signal can be several kHz in width and usually repeats at regular intervals across a HF band
DThe interfering signal sounds like AC hum on an AM receiver or a carrier modulated by 60 Hz hum on a SSB or CW receiver