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E4D03

How can intermodulation interference between two repeaters occur?

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AWhen the signals from the transmitters are reflected out of phase from airplanes passing overhead
BWhen the repeaters are in close proximity and the signals mix in the final amplifier of one or both transmitters
CWhen the signals from the transmitters are reflected in phase from airplanes passing overhead
DWhen the repeaters are in close proximity and the signals cause feedback in the final amplifier of one or both transmitters