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transmission line. Bravo, to make two antennas talk things out before the SWR gets ugly. Charlie, it's the official relationship counselor for a transmitter and a dummy load. Or Delta, to politely ask RF, which direction it plans to misbehave. I'll let it drop and read it again. KJ-5, MCV returning. What is the purpose of a directional coupler in RF transmission line? Is it Alpha? To sample forward and reflective power without significantly interrupting the transmission line. Bravo, to make two antennas talk things out before the SWR gets ugly. Charlie, it's the official relationship counselor for transmitter and a dummy load. Or Delta, to politely ask RF, which direction it plans to misbehave.