Ursprünglicher Beitrag von: gaseousweasel ,
Does it have a meter on it? If yes, does the meter move wen you whistle into the microphone? (that is rude on the air but for lack of test equipment..) Put a small AM radio right near the antenna and talk into the mike. Usually it will accidentally pick up the voice signal and you should hear it. It may squeal if the radio is loud and the mike picks up your signal.