[RTTY] BARTG 75 Sprint

[Joe Subich, W4TV]

 > For what its worth, there has never been an 8-bit version of the
 > "ASCII" code.

OK, then change my references to 75 7S2 (75 baud, 7 data bits,
SPACE parity, two stop bits) ... that would be equivalent to
75 8N2 as long as none of the "extended" characters are used.

73,

    ... Joe, W4TV

On 6/14/2010 5:33 AM, Kok Chen wrote:
>
> On Jun 13, 2010, at 11:59 PM, Joe Subich, W4TV wrote:
>
>> Actually 8+start+stop to 5+start+stop.
>
> For what its worth, there has never been an 8-bit version of the
> "ASCII" code.
>
> 8-bit codes such as ISO-8859 added 128 more codewords to ASCII.
> Informally, the 8-bit codes such as ISO-8859 that have ASCII in the
> lower 128 locations have been ad-hoc called "Extended ASCII."  But
> the ASCII Standard itself has never been expanded to 8 bits.
>
> You can confirm this by Googling for the phrases "ASCII," "ISO-8859,"
> "ISO-646" and "Extended ASCII."
>
> For the USA, the codes allowed in RTTY is governed by FCC Part 97.309
> "RTTY and data emission codes."
>
> 97.309(a)(1) relates to 5-bit Baudot, 97.309(a)(2) relates to 7-bit
> Amtor, and 97.309(a)(3) relates to 7-bit ASCII, which I quote:
>
>> "The 7-unit code, defined in American National Standards Institute
>> X3.4-1977 or International Alphabet No. 5 defined in International
>> Telegraph and Telephone Consultative Committee Recomendation T.50
>> or in International Organization for Standardization, International
>> Standard ISO 646 (1983), and extensions as provided for in CCITT
>> Recommendation T.61 (Malaga-Torremolinos, 1984) (commonly known as
>> ASCII)."
>
> 7-bit ASCII, 5-bit Baudot and 7-bit Amtor are "pre-approved" data
> encodings by the FCC.  If you want to use 8-bit codes (not
> specifically mentioned in Part 97), I think you'd defer to
> 97.309(b).
>
> Part 97 is of course only for US hams.  Many countries are more
> relaxed with what can or cannot be transmitted in the Amateur bands,
> while some countries are more restrictive.
>
> cocoaModem currently implements both Standard ASCII when selected to
> 7 bits, and ISO-8859-15 when selected to 8 bits.
>
> 73 Chen, W7AY
>
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