IRIG timecode: Difference between revisions

Revision as of 02:18, 10 September 2004

Revision as of 21:53, 24 October 2004

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As an example, one of the most common formats, IRIG B122:

IRIG B122 transmits one hundred pulses per second on an amplitude modulated 1 kHz sine wave carrier, encoding information in BCD. This means that 100 bits of information are transmitted every second. The time frame for the IRIG B standard is 1 second, meaning that one data frame of time information is transmitted every second. This data frame contains information about the day of the year (1-366), hours, minutes, and seconds. Information about which year it is is not transmitted. It should be noted that although information is transmitted only once per second, by using a [[phase locked loop]], a device can sychronize it'sits time very accurately with the device transmitting. Typical commercial devices will synchronize to within 1 microsecond using IRIG B timecodes.