A frequency is, a device that converts electrical audio signals into sound, a specific rate of oscillation of radio waves assigned to a specific radio station to carry radio signals, A transceiver is, a device that responds to radio frequency signals from air traffic controllers in order to communicate an aircraft’s location, a radio device that includes both a transmitter and a receiver, Squelch control is, a setting that controls the level of background noise, a set threshold at which noise becomes audible, An audio switch panel is, a setting that controls the level of background noise, a panel that manages the audio communication between the pilot, co-pilot, the cabin, and air traffic control, A handheld mike is, a microphone that one holds by hand, a microphone attached to a flexible pole that one can position as needed but does not have to hold.

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