IRIG timecode: Difference between revisions

Revision as of 16:43, 29 August 2024

Revision as of 14:54, 25 September 2024

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<ol start=0 type=1>

<li>[[Direct current|DC]] level shift (DCLS) ([[Pulse-width modulation|pulse width coded]] without carrier)</li>

<li>Sine wave carrier ([[Amplitude modulation|amplitude modulated]])</li>

<li>[[Manchester code|Manchester]] modulated</li>

</ol>

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Thus the complete signal identification number consists of one letter and three digits. For example, the signal designated as B122 is deciphered as follows: Format B, Sine wave (amplitude modulated), 1&nbsp;kHz carrier, and Coded expressions BCDTOY.

The most commonly used of the standards is IRIG B, then IRIG A, then probably IRIG G. Timecode formats directly derived from IRIG H are used by [[National Institute of Standards and Technology|NIST]] [[radio station]]s [[WWV (radio station)|WWV]], [[WWVH]] and [[WWVB]].

For example, one of the most common formats, IRIG B122:

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* Bits 10–13 encode minutes, and bits 15–17 encode tens of minutes (0–59)

* Bits 20–23 encode hours, and bits 25–26 encode tens of hours (0–23)

* Bits 30-33 encode [[Ordinal date|day of year]], 35-38 encode tens of days, and bits 40–41 encode hundreds of days (1–366)

* Bits 45–48 encode tenths of seconds (0–9)

* Bits 50–53 encode years, and bits 55–58 encode tens of years (0–99)