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
> >>
> >
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
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> >
> >
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
> _______________________________________________
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>
>
> STEVEN GRANT W4IIV
>
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