E4D03:

How can intermodulation interference between two repeaters occur?

  1. When the repeaters are in close proximity and the signals cause feedback in the final amplifier of one or both transmitters
  2. When the repeaters are in close proximity and the signals mix in the final amplifier of one or both transmitters
  3. When the signals from the transmitters are reflected out of phase from airplanes passing overhead
  4. When the signals from the transmitters are reflected in phase from airplanes passing overhead