[GreenKeys] FCC substitutes bandwidth limit for baud rate limit on HF

[Richard Knoppow]

    Somehow missed that or else didn't understand it. Thank you.

On 11/14/2023 11:45 PM, hwhall at aol.com wrote:
> Right in the first paragraph it says:
> " rules regarding technical standards applicable to data communications 
> that may be transmitted in the Amateur Radio Service."
> So, just data communications.
> 
> Wayne
> WB4OGM
> 
> On Tuesday, November 14, 2023 at 11:02:03 PM MST, Richard Knoppow 
> <1oldlens1 at ix.netcom.com> wrote:
> 
> 
>      Perhaps someone here understands this better than I do. Does the
> bandwidth limitation apply only to digital or data transmission or to
> all transmission, such as SSB and AM?  If it applies to those it would
> pretty much kill AM. I usually can make some sense of legal documents
> but this one has stymied me.
> 
> On 11/14/2023 11:53 AM, Harold Hallikainen via GreenKeys wrote:
>  > They are substituting a bandwidth limit of 2.8 kHz for the previous baud
>  > rate limit of 300 baud.
>  >
>  > https://docs.fcc.gov/public/attachments/FCC-23-93A1.pdf 
> <https://docs.fcc.gov/public/attachments/FCC-23-93A1.pdf>
>  >
>  > Looking at the new 97.307...
>  >
>  > § 97.307 Emission standards.
>  > * * * * *
>  > (f) * * *
>  > (3) Only a RTTY or data emission using a specified digital code listed in
>  > § 97.309(a) may be transmitted. The authorized bandwidth is 2.8 kHz 
> except
>  > in the 2200 m band and 630 m band. In the 2200 m band and the 630 m band
>  > the symbol rate must not exceed 300 bauds, or for frequency-shift
>  > keying, the frequency shift between mark and space must not exceed 1 kHz.
>  >
>  > It looks like the 1 kHz shift limit is ONLY for the 2200 meter and 630
>  > meter bands. So, can we run 2 kHz shift to get around selective fading?
>  >
>  > Further, the wording of that section appears to limit baud rate or shift,
>  > but not both for those bands. Since those bands are quite narrow 
> (135.7 to
>  > 137.8 kHz and 472 kHz to 479 kHz), it's difficult to run very wide shift
>  > or  high baud rate.
>  >
>  > Harold
>  > https://w6iwi.org <https://w6iwi.org>
>  >
> 
> 
> -- 
> Richard Knoppow
> Los Angeles
> WB6KBL
> SKCC 19998
> 
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-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998