When John Glenn communicates with the Mission Control beeps can be heard at the beginning and end of his transmissions as well as those from the ground to him. These 'Quindar tones' are used to activate and squelch the capsule radio so the crew isn't bothered by noise or static when not in use and only the ground to pilot transmissions would carry these tones.
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05/03/2025 alle ore 07:20
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