Which of the following is used to reduce or eliminate intermodulation interference in a repeater caused by a nearby transmitter?
A band-pass filter in the feed line between the transmitter and receiver
A properly terminated circulator at the output of the repeater’s transmitter✓Bonne réponse
Utilizing a Class C final amplifier
Utilizing a Class D final amplifier
Explication
A circulator passes power toward the antenna but routes energy arriving from the antenna into a termination, so a nearby transmitter's signal never reaches the final amplifier where mixing would occur. The termination has to be present and correctly rated, otherwise that energy is simply reflected back into the amplifier.