[TenTec] Enhanced SSB

[al_lorona at agilent.com]

Aw, c'mon, George, that question is simply meant to provoke. You already know why!

Look, I can be just as silly:

For that matter,

What are the advantages of transmitting a signal with more than 25 W of power?

What are the advantages of transmitting your call many, many, many times, over and over, using up valuable bandwidth, in an attempt to contact someone in the South Sandwich Islands?

What are the advantages of transmitting a signal that bounces off of the moon, when you could simply turn your antenna directly toward the other guy, switch to a lower frequency band, and work him directly?

What are the advantages of transmitting all weekend, practically nonstop, foregoing sleep and family, just so you can see your call sign in 2-point type in the contest results of a magazine that is read by fewer than 250,000 people?

What are the advantages of transmitting with home-built gear, when you can just go out and buy new equipment from a dealer? 

Heck, for that matter, why transmit voice at all? If the same communications can be done on CW, then am I to presume that you are prepared to declare that the lower bandwidth mode is always preferable?


Al W6LX




> -----Original Message-----
> From: Carl Moreschi [mailto:n4py at earthlink.net] 
> Sent: Saturday, 19 April 2003 1:35 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] Enhanced SSB
> 
> 
> Simply because it sounds nice.
> 
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message -----
> From: "George, W5YR" <w5yr at att.net>
> To: <tentec at contesting.com>
> Sent: Saturday, April 19, 2003 5:12 PM
> Subject: Re: [TenTec] Enhanced SSB
> 
> 
> > What are the advantages of transmitting voice frequency 
> components in the
> > range of 50 to 300 Hz?
> >
> > 73/72, George
> > Amateur Radio W5YR -  the Yellow Rose of Texas
> > Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
> > "In the 57th year and it just keeps getting better!"
> > <mailto:w5yr at att.net>
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Paul Christensen, Esq." <attorney at broadcast.net>
> > To: <tentec at contesting.com>
> > Sent: Friday, April 18, 2003 10:42 AM
> > Subject: Re: [TenTec] Enhanced SSB
> >
> >
> > > > I understand that the purpose of SSB was to minimize 
> the bandwidth,
> > increase
> > > efficiency, and pass only the necessary voice bandwidth for
> > communications.
> > >
> > > After researching the subject matter from QST issues 
> during the '40s and
> > '50s, I have concluded that SSB was developed as a mode
> > > which would offer greater articulation of communications through:
> > >
> > > 1) A reduction in transmitted power for a commensurate level of
> > intelligibility compared with that of AM;
> > > 2) A reduction in equipment weight;
> > > 3) A reduction in power supply capacity and loading 
> (owing to a lower
> > overall duty-cycle);
> > > 4) A reduction in transmitted bandwidth without 
> necessarily compromising
> > transmitted fidelity;
> > > 5) The elimination of an unnecessary redundant sideband; and
> > > 6) The elimination of an unnecessary "power hungry" carrier.
> > >
> > > A note concerning point #4 above: The fact that SSB 
> transmitted audio
> > bandwidth has been relatively restricted during the past forty
> > > years without an emphasis on low-frequency energy, is due 
> to limitations
> > in crystal filter technology: in order to achieve
> > > reasonable alternate sideband rejection, the carrier set 
> point must
> > necessarily be placed in a region which compromises low
> > > frequency energy.
> > >
> > > While the "phasing" method of eliminating the opposite 
> sideband first
> > appeared as a solution, maintaining good carrier suppression
> > > and alternate sideband rejection became a problem with 
> temperature and
> > mechanical changes and deterioration.  It wasn't until the
> > > advent of DSP technology that better fidelity could be reasonably
> > transmitted.  If DSP techniques were available in the '40s and
> > > '50s, the overall audio quality and bandwidth we hear on 
> the bands today
> > would be much different.
> > >
> > > -Paul, W9AC
> > >
> > >
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