CCIR 476

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.

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.

CCIR 476 (Letter set)[1]

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_																SIA 0006
1_								J 004A				F 0046		C 0043	K 004B
2_								W 0057				Y 0059		P 0050	Q 0051
3_				SIB 0016		G 0047	FIGS 000E			M 004D	X 0058		V 0056
4_								A 0041				S 0053		I 0049	U 0055
5_				D 0044		R 0052	E 0045			N 004E	LTRS 000F		SP 0020
6_				Z 005A		L 004C	RPT 0015			H 0048	BLK 0000		LF 000A
7_		O 004F	B 0042		T 0054				CR 000D

  Letter   Number   Punctuation   Symbol   Other   Undefined

CCIR 476 (Figure set)[1]

	_0	_1	_2	_3	_4	_5	_6	_7	_8	_9	_A	_B	_C	_D	_E	_F
0_																SIA 0006
1_								BEL 0007				! 0021		: 003A	( 0028
2_								2 0032				6 0036		0 0030	1 0031
3_				SIB 0016		& 0026	FIGS 000E			. 002E	/ 002F		= 003D
4_								- 002D				' 0027		8 0038	7 0037
5_				ENQ 0005		4 0034	3 0033			, 002C	LTRS 000F		SP 0020
6_				+ 002B		) 0029	RPT 0015			£ 00A3	BLK 0000		LF 000A
7_		9 0039	? 003F		5 0035				CR 000D

  Letter   Number   Punctuation   Symbol   Other   Undefined

References

1. ARRL 2013 Handbook, Chapter 16