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== Timecodes ==
The different timecodes defined in the Standard have alphabetic designations. A, B, D, E, G, and H are the standards currently defined by IRIG Standard 200-04.
C<ref>{{cite tech report |url=https://apps.dtic.mil/sti/pdfs/ADA000295.pdf |archive-url=https://web.archive.org/web/20130408112407/http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA000295 |url-status=live |archive-date=April 8, 2013 |format=pdf |title=Special Hardware for ARL Analysis of ACODAC Data |first1=Richard O. |last1=Grohman |first2=Larry L. |last2=Mellenbruch |first3=Felix J. |last3=Sowic |date=1974-03-14 |publisher=Texas University at Austin |id=ARL-TM-74-12 |access-date=2011-12-23 | df = dmy-all }}</ref><ref>{{cite book | title = Handbook of Time Code Formats | url = http://www.vk7krj.com/ham_stuff_pics/Handbook_of_Time_Code_Formats.pdf | publisher = Datum Inc. | edition = Seventh | year = 1987 | page = 18 | access-date = 2024-03-18 | archive-url = https://web.archive.org/web/20230308040915/https://www.vk7krj.com/ham_stuff_pics/Handbook_of_Time_Code_Formats.pdf | archive-date = 2023-03-08 | url-status = live | via = vk7krj.com | df = dmy-all}}</ref> was in the original specification, but was replaced by H.▼
The main difference between codes is their rate, which varies between one pulse per minute and 10,000 pulses per second.
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| 100 Hz || 10 ms || 100 || 1 s || 1 Hz
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! C{{efn-ua|name=CH}}
| 2 Hz || 0.5 s || 120 || 60 s || {{frac|60}} Hz
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| 1 Hz || 1000 ms || 60 || 60 s || {{frac|60}} Hz
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{{notelist-ua|name=CH|refs=
▲{{efn-ua|name=CH|C<ref>{{cite tech report |url=https://apps.dtic.mil/sti/pdfs/ADA000295.pdf |archive-url=https://web.archive.org/web/20130408112407/http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA000295 |url-status=live |archive-date=April 8, 2013 |format=pdf |title=Special Hardware for ARL Analysis of ACODAC Data |first1=Richard O. |last1=Grohman |first2=Larry L. |last2=Mellenbruch |first3=Felix J. |last3=Sowic |date=1974-03-14 |publisher=Texas University at Austin |id=ARL-TM-74-12 |access-date=2011-12-23 | df = dmy-all }}</ref><ref>{{cite book | title = Handbook of Time Code Formats | url = http://www.vk7krj.com/ham_stuff_pics/Handbook_of_Time_Code_Formats.pdf | publisher = Datum Inc. | edition = Seventh | year = 1987 | page = 18 | access-date = 2024-03-18 | archive-url = https://web.archive.org/web/20230308040915/https://www.vk7krj.com/ham_stuff_pics/Handbook_of_Time_Code_Formats.pdf | archive-date = 2023-03-08 | url-status = live | via = vk7krj.com | df = dmy-all}}</ref> was in the original specification, but was replaced by H.}}
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The bits are modulated on a carrier. A three-digit suffix specifies the type and frequency of the carrier, and which optional information is included:
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