APPS: What is IRIG Time code?

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Re: APPS: What is IRIG Time code?
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IRIG time codes are often used by radio clocks to set/synchronize the date and time on other devices.  It predates standards such as the 1 PPS output from many GPS receivers.  It is common to achieve accuracies as close as one micro-second with systems such as IRIG-B.  

A radio clock might be used to set the time and date at an RTU, to maintain synchronization across wide areas, and so on.  

In general, wherever isochronous time is required, it is common to see radio/atomic clocks with IRIG-B outputs.  
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