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16 lines
493 B
Markdown
16 lines
493 B
Markdown
---
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title: NASA Roger Beep
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language: en
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layout: default
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created: 2008-08-11 01:30:57 +0200
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updated: 2010-03-12 19:32:32 +0100
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toc: false
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tags:
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- know-how
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- miscellaneous
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- audio
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- space
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---
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The "Roger" beep after transmissions from Space missions is @ 2475 Hz for 250 ms. According to [everything2](http://everything2.com/e2node/Roger%2520beep),
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there should be a pre-transmission tone @ 2525 Hz for 250 ms. They are called [Quindar tones](http://en.wikipedia.org/wiki/Quindar_tones).
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