Quindar
Quindar tones are the "beeps" that are heard during the American space missions. During the early days of the space program they were a means by which remote transmitters on Earth were turned on and off so that the capsule communicator (CapCom) could communicate with the crews of the spacecraft. It was a means of in-band signaling to simulate the action of the push-to-talk and release-to-listen (often referred to as PTT) button commonly found on two-way radio systems and walkie-talkies. However, even though the tones are no longer necessary with modern digital communication systems, they have been retained both for their historic aspect, and because flight controllers say they appreciate the audible cue of an imminent transmission.
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