[GreenKeys] AMTOR/SITOR/NAVTXT Protocol

[Olaf DL8OBH]

Peter Martinez, G3PLX did the implementation for us, the Radio-Amateurs, 
at the end of the 70s

And an eternal memory to Hendrik C. A. van Duuren for his life's work, 
the development of fault-free digital radio communication and other 
radio telex equipment, especially in the form of

Telex over Radio  -  "TOR" !!! Later described in the CCIR 476-5 and 
ITU-R M.625 specification.

(PROCEEDINGS OF THE IEEE, VOL. 89, NO. 10, OCTOBER 2001: Fault-Free 
Digital Radio Communication and Hendrik C. A. van Duuren)

Have Fun,

Olaf  -  DL8OBH  /  AF0A


Am 08.12.2014 19:30, schrieb 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.
>