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E4E10

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

Select	Answer
A	The interfering signal sounds like AC hum on an AM receiver or a carrier modulated by 60 Hz hum on a SSB or CW receiver
B	The interfering signal may drift slowly across the HF spectrum
C	All of these choices are correct
D	The interfering signal can be several kHz in width and usually repeats at regular intervals across a HF band

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