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How can intermodulation interference between two repeater transmitters in close proximity often be reduced or eliminated?
By installing a terminated circulator or ferrite isolator in the transmission line to the transmitter and duplexer
A ferrite isolator or circulator allows RF power to flow from the transmitter to the antenna but heavily attenuates any RF power attempting to flow back into the transmitter from the antenna (e.g., from a nearby transmitter), thus preventing it from reaching the final amplifier and causing intermodulation.
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