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  2. Quindar tones - Wikipedia

    en.wikipedia.org/wiki/Quindar_tones

    Therefore, those transmissions would consist of a "beep" (PTT press) followed by Houston talking, then another "beep" (PTT release) and finally the voice of the astronauts. Another misconception about Quindar tones is that they were designed to signal the end of a transmission, similar to a courtesy tone used on many half-duplex radio repeaters .

  3. Specific Area Message Encoding - Wikipedia

    en.wikipedia.org/wiki/Specific_Area_Message_Encoding

    The text of the header code is a fixed format: <Preamble>ZCZC-ORG-EEE-PSSCCC+TTTT-JJJHHMM-LLLLLLLL- This is broken down as follows: 1. A preamble of binary 10101011 (0xAB in hex) repeated sixteen times, used for "receiver calibration" (i.e., clock synchronization), then the letters ZCZC as an attention to the decoder (a message activation method inherited from NAVTEX).

  4. Greenwich Time Signal - Wikipedia

    en.wikipedia.org/wiki/Greenwich_Time_Signal

    On Remembrance Day and Remembrance Sunday, Radio 4 uses the pips at 10:59:55 to mark the start of the two minutes silence and again at 11:01:55 to mark the end. BBC Radio 5 Live broadcast the pips at 06:00 between 2000 and 2008. BBC Radio 3 and BBC Radio 5 Live does not broadcast the pips. The BBC World Service broadcasts the pips every hour.

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