Abstract: This invention relates to a method and apparatus for operating a mobile communications transmitter/receiver type radio from a motorcycle or in another high ambient noise environment. A contact vibration transducer is provided for being coupled to the throat area of the communicator for generating a transmit audio signal responsive to the vibrations of the vocal cords talking. The transmit audio signal is then coupled to a modulator section of the communications transmitter for modulating the transmitter output. A voice operated relay is provided for switching the transmitter/receiver into and out of the transmit mode responsive to receiving the transmit audio signal from the contact vibration transducer. In this manner the transmit audio signal and the transmit/receive switching will be relatively impervious to the high ambient noise levels surrounding the communicator.