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U.S. allows >20khz HF digital bandwidth ALREADY, was Q15X25, RDFT, Wyman etc

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  • wb8wka
    Rick: Yes, I see the rules. However, you made a specific claim that it was currently legal to use UP TO 3khz bandwidth ... I assume you mean in the U.S.
    Message 1 of 11 , Aug 20, 2005

      Yes, I see the rules. However, you made a specific claim that it "was
      currently legal to use UP TO 3khz bandwidth"... I assume you mean in
      the U.S.

      Again, SPECIFICALLY, where does it spell out the 3khz limitation in
      the HF digital subband? I simply don't see it. I was referrencing
      97.305, 97.307 and 97.309. There is a vague limitation in the phone
      subbands -97.307(f)(2)-, but only -97.307(f)(3 & 9)- apply to the
      digital subbands.


      I'm dead serious. Look at it. The common wisdom of 3khz (as you cite)
      seems to be what folks talk about, but that dog ain't no-where to be
      found in USC47, Part 97. I've gone over it time and time again, and
      ran it by a few other folks who can't find it either.


      p.s. Best as I call tell, the current bandwidth limits for baud rate
      limited OFDM (each carrier <300baud, xPSK modulations) are the

      --- In Q15X25@yahoogroups.com, "Rick Muething" <rmuething@c...> wrote:
      > Jeff,
      > You can find the Part 97 rules at
      > http://www.arrl.org/FandES/field/regulations/news/part97/
      > The applicable rules for data are
      > 97.305, 97.309 and for automatically controlled stations 97.221
      > Rick KN6KB
      > -----Original Message-----
      > From: wb8wka [mailto:wb8wka@y...]
      > Sent: Monday, March 28, 2005 05:39 PM
      > To: Q15X25@yahoogroups.com
      > Subject: [Q15X25] Re: Q15X25, RDFT, Wyman etc
      > --- In Q15X25@yahoogroups.com, "Rick Muething" <rmuething@c...>
      > > Re legality. It is currently legal to use digital modes up to 3
      > > bandwidth on HF (e.g. Pactor III is 2.2 KHz, MT63 is 2.0, DIGTRX
      > SCAMP
      > > are 2.0 etc).
      > What section of the rules does it say this? I can't find any
      > limits for OFDM digital data in the phone/image subbands.
      > Thanks
      > Jeff
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