[GreenKeys] AMTOR/SITOR/NAVTXT Protocol

[Chris Elmquist]

I found this too (you know, while I was supposed to be working  ;-)  ),

http://www.w7ay.net/site/Applications/cocoaModem/UsersManual/sitorManual/#sitor

	SITOR-B is an implementation of CCIR 476-5 specifications, using
	the same 170 Hz shift as Amateur RTTY, but at 100 baud and using
	synchronous transmission (no start or stop bits). Character
	synchronization is from occasional sync patterns and from
	the structure of the character stream itself. FEC is achieved
	through the use of a 7-bit code, which implements essentially the
	same character set as 5 bit Baudot, allowing single error bits
	per character to be completely recoverable. In addition, each
	character is repeated once in an interleaved character stream,
	delayed from the original character by 35 bits. This repeated
	character gives another layer for error detection and correction.

-- 
Chris Elmquist