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CCIR 476

{{Short description|Character encoding used in radio data protocols}}

CCIR 476 is a character encoding used in radio data protocols such as SITOR, AMTOR and Navtex. It is a recasting of the ITA2 character encoding, known as Baudot code, from a five-bit code to a seven-bit code. In each character, exactly four of the seven bits are mark bits, and the other three are space bits. This allows for the detection of single-bit errors.

Technical details

The number of possible valid binary code values in CCIR 476 is the number of ways to choose 4 marks for 7 bit positions, and the number can be calculated using the binomial coefficient: \ \textstyle \binom{7}{3} = \binom{7}{4} = 35\ . Thus CCIR 476 has 3 additional code points available over ITA2's 32 code points.

The SITOR protocol uses the additional three code points (denoted as SIA, SIB and RPT below) for idle, phasing, and repeat requests.{{harvnb|Schetgen|1995|p=12.21}} In addition, some of the ordinary characters are reused as control signals.{{nobr|CCIR Rec. 625}} Service Information Signals.

Character set

In these tables, the hexadecimal code values are converted from a binary representation, with 1 being mark, 0 being space, and the most significant bit given first. The international version of ITA2 is used here; note also the added non-ITA2 codes SIA, SIB and RPT, used by SITOR.

{{chset-table-header1|CCIR 476 (Letter set){{cite web|url=http://www.discolodxgroup.cl/documentos/otros/ARRL%202013%20Handbook/ARRL%202013%20Handbook%20Supplemental%20Files/Chapter%2016/ITA2-CODES.pdf|title= ARRL 2013 Handbook, Chapter 16; ITA2 (Baudot) and AMTOR Codes|archive-url=https://web.archive.org/web/20220211215211/http://www.discolodxgroup.cl/documentos/otros/ARRL%202013%20Handbook/ARRL%202013%20Handbook%20Supplemental%20Files/Chapter%2016/ITA2-CODES.pdf|archive-date=2022-02-11|url-status=dead|date=2013}}}}
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|{{chset-cell1|U+004A LATIN CAPITAL LETTER J|J}}

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|{{chset-cell1|U+0046 LATIN CAPITAL LETTER F|F}}

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|{{chset-cell1|U+0043 LATIN CAPITAL LETTER C|C}}

|{{chset-cell1|U+004B LATIN CAPITAL LETTER K|K}}

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|{{chset-cell1|U+0057 LATIN CAPITAL LETTER W|W}}

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|{{chset-cell1|U+0059 LATIN CAPITAL LETTER Y|Y}}

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|{{chset-cell1|U+0050 LATIN CAPITAL LETTER P|P}}

|{{chset-cell1|U+0051 LATIN CAPITAL LETTER Q|Q}}

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SIB}}

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|{{chset-cell1|U+0047 LATIN CAPITAL LETTER G|G}}

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|{{chset-cell1|U+004D LATIN CAPITAL LETTER M|M}}

|{{chset-cell1|U+0058 LATIN CAPITAL LETTER X|X}}

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|{{chset-cell1|U+0056 LATIN CAPITAL LETTER V|V}}

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|{{chset-cell1|U+0041 LATIN CAPITAL LETTER A|A}}

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|{{chset-cell1|U+0053 LATIN CAPITAL LETTER S|S}}

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|{{chset-cell1|U+0049 LATIN CAPITAL LETTER I|I}}

|{{chset-cell1|U+0055 LATIN CAPITAL LETTER U|U}}

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|{{chset-cell1|U+0044 LATIN CAPITAL LETTER D|D}}

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|{{chset-cell1|U+0052 LATIN CAPITAL LETTER R|R}}

|{{chset-cell1|U+0045 LATIN CAPITAL LETTER E|E}}

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|{{chset-cell1|U+004E LATIN CAPITAL LETTER N|N}}

|{{chset-ctrl1|U+000F SHIFT IN|LTRS}}

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|{{chset-ctrl1|U+0020 SPACE| SP }}

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|{{chset-cell1|U+005A LATIN CAPITAL LETTER Z|Z}}

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|{{chset-cell1|U+004C LATIN CAPITAL LETTER L|L}}

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RPT}}

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|{{chset-cell1|U+0048 LATIN CAPITAL LETTER H|H}}

|{{chset-ctrl1|U+0000 NULL|BLK}}

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|{{chset-ctrl1|U+000A LINE FEED (LF)|LF}}

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|{{chset-cell1|U+004F LATIN CAPITAL LETTER O|O}}

|{{chset-cell1|U+0042 LATIN CAPITAL LETTER B|B}}

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|{{chset-cell1|U+0054 LATIN CAPITAL LETTER T|T}}

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|{{chset-ctrl1|U+000D CARRIAGE RETURN (CR)|CR}}

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{{chset-table-header1|CCIR 476 (Figure set)}}
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|{{chset-ctrl1|U+0007 BELL|BEL}}

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|{{chset-cell1|U+0021 EXCLAMATION MARK|!}}

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|{{chset-cell1|U+0028 LEFT PARENTHESIS|(}}

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|{{chset-cell1|U+0032 DIGIT TWO|2}}

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|{{chset-cell1|U+0036 DIGIT SIX|6}}

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|{{chset-cell1|U+0030 DIGIT ZERO|0}}

|{{chset-cell1|U+0031 DIGIT ONE|1}}

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|{{chset-cell1|U+0026 AMPERSAND|&}}

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|{{chset-ctrl1|U+0005 ENQUIRY|ENQ}}

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|{{chset-cell1|U+0034 DIGIT FOUR|4}}

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|{{chset-cell1|U+002C COMMA|,}}

|{{chset-ctrl1|U+000F SHIFT IN|LTRS}}

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|{{chset-cell1|U+0039 DIGIT NINE|9}}

|{{chset-cell1|U+003F QUESTION MARK|?}}

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|{{chset-cell1|U+0035 DIGIT FIVE|5}}

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|{{chset-ctrl1|U+000D CARRIAGE RETURN (CR)|CR}}

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References

{{reflist}}

  • {{Citation |editor-last=Schetgen |editor-first=Robert |title=The ARRL Handbook for Radio Amateurs |year=1995 |edition=Seventy-Third (1996) |publisher=The American Radio Relay League |location=Newington, CT |isbn=0-87259-173-5 |url-access=registration |url=https://archive.org/details/arrlhandbookforr00amer }}

Category:Character encoding

Category:Character sets

Category:Telegraphy

Category:Amateur radio