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E4E12:What causes interference received as a series of carriers at regular intervals across a wide frequency range?

E4E12E4E

What causes interference received as a series of carriers at regular intervals across a wide frequency range?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E4E12 is Switch-mode power supplies.

The key fact is Switch-mode power supplies. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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