This is a falacy. My DSP rig does not allow any significant energy in the
opposite sideband.
However, when there is enough low frequency content, it can sound like a
carrier when you tune
through the signal. If there was a carrier, you would also hear it when there
was no modulation,
which is NOT the case. I know -- I have checked my signal with a spectrum
analyzer.
This is the kind of incorrect information that creates bogus complaints and
rules that we don't
need. I suggest that anyone wishing to point fingers get a spectrum analyzer
and look at their
own signals with their compressors cranked up overdriving their amplifiers.
Then talk to me about
4 or 6 kHz being too wide.
Joe,
N3JI
--- Frank Mayer <domino@worldlynx.net> wrote:
> Having bass that extends well below 100hz will cause a SSB signal to be wide
> by modulating too
> close to the carrier point, crossing over onto the other sideband, and
> virtually turning into a
> DSB signal If you don't believe this just try tuning a "hi-fi" guy in on
> using the AM mode.
> The signal will be 100% intelligible!! You can even hear the carrier when
> you tune across one
> of these signals. Plus the fact when one tries to force over 10db of extra
> energy at very low
> or very high frequencies the IMD is terrific and that also contributes to the
> width of the
> signal.
>
> WY3D
> ----- Original Message -----
> From: Joe Isabella
> To: Amps
> Sent: Thursday, August 26, 2004 3:02 PM
> Subject: Re: [Amps] Centurion cooling improvement ideas for AM service
>
>
> Apparently, I'm one of "these morons". However, be careful not to cast
> stones when you live
> in a
> glass house, because "Bassiness" has nothing to do with the extended BW.
> Only the high
> frequencies take up the extra amount between 3 and 6 kHz. I run out to 6k
> sometimes, but only
> when there is enough space. I'll continue to use my bottom end even if I
> only run out to
> 3.2kHz
> or so.
>
> One other thing to keep in mind is that these rules only affect the US.
> There are many
> Canadians
> running 6k SSB (hence my moving to Canada comment), so don't expect all the
> 6k SSB to
> miraculously
> disappear. Their gov't allows 6k in the voice spectrum which is plenty. I
> don't understand
> why
> we have to put such strict limits on it.
>
> Oh well -- I guess I'll keep on using AM at 9 kHz of bandwidth all the time
> istead of the 4 to
> 6
> kHz that I would normally have been running on SSB. Be careful what you
> ask for.
>
> Joe,
> N3JI
>
> --- "Steven Grant, W4IIV" <stevengrant98@yahoo.com> wrote:
>
> > the reason they are doing this is because some folks love to have very
> bassey audio. thier
> egos
> > say that they must have broadcast quality audio.
> > i dont think they will do away with AM or 10m FM
> > i do believe that they need to limit SSB widths cause some of these
> "morons" insist on
> taking up
> > bandwidth with a 5kc wide SSB signal
> > steven, W4IIV
> >
> > "R.Measures" <r@somis.org> wrote:
> >
> > On Aug 25, 2004, at 1:12 PM, Joe Isabella wrote:
> >
> > > Prezactly... Except that it allows wider digital modes in the "CW"
> > > bands, and it limits SSB Voice
> > > to 3 kHz. I'm not a big fan of this move by the League -- seems silly
> > > to put these limits in
> > > place on voice. I think I'll move to Canada...eh??
> > >
> > Joe -- Letting the amateur radio community determine how a band is used
> > has worked well enough on 160m. The vast CW wasteland presently on 80m
> > is a good example of bad rule-making.
> > end
> >
> > > Joe
> > >
> > > --- Vic Rosenthal wrote:
> > >
> > >> R.Measures wrote:
> > >>
> > >>> Thanks, Joe. So this means that if adopted, 10m FM as well as AM
> > >>> will
> > >>> be illegal.
> > >>
> > >> The bandwidth allowed in 29.0 - 29.7 MHz is 16 KHz.
> > >>
> > >> There is a specific provision to allow DSB AM in the 3 KHz areas:
> > >>
> > >> "(1) The 3 kHz maximum bandwidth does not apply to double-sideband
> > >> amplitude-modulated phone A3E emissions which are limited to --26 dB
> > >> bandwidths of 9 kHz."
> > >>
> > >> You can read the whole thing at:
> > >>
> > >>
> > >>
> > >> It's not going to make any revolutionary changes.
> > >>
> > >> --
> > >> 73,
> > >> Vic, K2VCO
> > >> Fresno CA
> > >> http://www.qsl.net/k2vco
> > >>
> > >>
> > >> _______________________________________________
> > >> Amps mailing list
> > >> Amps@contesting.com
> > >> http://lists.contesting.com/mailman/listinfo/amps
> > >>
> > >
> > >
> > >
> > >
> > > __________________________________
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> > > _______________________________________________
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> > >
> > >
> > Richard L. Measures, AG6K, 805.386.3734. www.somis.org
> >
> > _______________________________________________
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> > Amps@contesting.com
> > http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> >
> > STEVEN GRANT W4IIV
> >
> > ---------------------------------
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>
>
>
>
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