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wiki.mbirth.de/know-how/misc/_posts/2010-03-12-nasa-roger-beep.md

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NASA Roger Beep en default 2008-08-11 01:30:57 +0200 2010-03-12 19:32:32 +0100 false
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The "Roger" beep after transmissions from Space missions is @ 2475 Hz for 250 ms. According to everything2, there should be a pre-transmission tone @ 2525 Hz for 250 ms. They are called Quindar tones.