I believe the RTTY variants are limited in bandwidth by stipulation of the
maximum shift frequency outlined elsewhere in the regulations.
I don't get that same warm fuzzy with respect to paragraph 4.
Al
AB2ZY
Sent from my iPhone
> On Aug 9, 2016, at 8:09 PM, William Lisk <wglisk@outlook.com> wrote:
>
> Could someone help me understand the Commission's line of reasoning about the
> intrinsic bandwidth limitations of the schemes listed in 97.309(a)?If the
> symbol rate limit is removed, It would appear that data could be transmitted
> at any desired rate using any published technique, as described in
> 97.309(a)(4).Further, it would seem that any technique could quickly be
> published online and thus comply with this rule.
>
> Thanks for any insights.
>
> Bill/KC2EMH
>
> -------------------------------------------------------------
>
> _From the Conclusion section of the NPRM_:
>
> We do not, however, propose a bandwidth limitation for data emissions in the
> MF and HF bands to replace the baud rate limitations, /because the rules’
> current approach for limiting bandwidth use by amateur stations using one of
> the specified digital codes /[those listed in 97.309(a)—shown below]/to
> encode the signal being transmitted appears sufficient to ensure that general
> access to the band by licensees in the amateur service does not become unduly
> impaired./
>
> *§97.309 RTTY and data emission codes.*
>
> (a) Where authorized by §§97.305(c) and 97.307(f) of the part, an amateur
> station may transmit a RTTY or data emission using the following specified
> digital codes:
>
> (1) The 5-unit, start-stop, International Telegraph Alphabet No. 2, code
> defined in ITU-T Recommendation F.1, Division C (commonly known as “Baudot”).
>
> (2) The 7-unit code specified in ITU-R Recommendations M.476-5 and M.625-3
> (commonly known as “AMTOR”).
>
> (3) The 7-unit, International Alphabet No. 5, code defined in IT--T
> Recommendation T.50 (commonly known as “ASCII”).
>
> (4) An amateur station transmitting a RTTY or data emission using a digital
> code specified in this paragraph *may use _any_ technique whose technical
> characteristics have been documented publicly*, such as CLOVER, G-TOR, or
> PacTOR, for the purpose of facilitating communications.
>
> _______________________________________________
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