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My first multi-operator experience was a ham-camping trip with my brother Bill (NG4T) in 2000. After installing a couple of wire antennas in the trees we discovered that when one of us was transmitting the other couldn’t receive anything but interference. I later learned that simultaneous operation of two radio transmitters in close proximity on separate bands will overload and desensitize the radio’s receivers. A bandpass filter for each radio can be used to reduce this problem but the filter must be able to withstand the transmitter’s power.