Amateur Extra Class: 2020–2024
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E4E11:

What could cause local AM broadcast band signals to combine to generate spurious signals in the MF or HF bands?

  1. One or more of the broadcast stations is transmitting an over-modulated signal
  2. Nearby corroded metal joints are mixing and re-radiating the broadcast signals
  3. You are receiving skywave signals from a distant station
  4. Your station receiver IF amplifier stage is defective
E4E01 E4E02 E4E03 E4E04 E4E05 E4E06 E4E07 E4E08 E4E09 E4E10 E4E11