On Tue, 21 Dec 2010 17:35:07 -0000, wrote:
Szczepan Bialek wrote:
"Well, it's like this. The story starts in 1915, when mankind discovered
sidebands. Now possessing this superior understanding of the AM signal,
radio scientists began to understand the implications of their discovery.
Soon afterwards, our old friends at Bell Labs, who have discovered
practically everything, developed a method for removing one of the sidebands
of an AM signal but retaining all the essential modulation components. As an
expert of that day supposedly said, "both sidebands are saying the same
thing" (Goodman, 1948). " From:
http://www.hamradiomarket.com/articles/SSBHistory.htm

I was born after 1915. I am supposing that in that time was possibility to
tune to the three different frequences.
Am I right?
S*

Nope, you are just spouting word salad gibberish as usual.

Which, in this instance, has squat zilch to do with antennas.

On Dec 21, 9:13*am, "Szczepan Bialek" wrote:
"Well, it's like this. The story starts in 1915, when mankind discovered
sidebands. Now possessing this superior understanding of the AM signal,
radio scientists began to understand the implications of their discovery.
Soon afterwards, our old friends at Bell Labs, who have discovered
practically everything, developed a method for removing one of the sidebands
of an AM signal but retaining all the essential modulation components. As an
expert of that day supposedly said, "both sidebands are saying the same
thing" (Goodman, 1948). " From:http://www.hamradiomarket.com/articles/SSBHistory.htm

I was born after 1915. I am supposing that in that time was possibility to
tune to the three different frequences.
Am I right?
S*

Only three? If the modulation is a complex signal (not just a single
sinusoid), you'll get (ideally) a carrier on a single frequency, and
upper and lower sidebands spanning a range of frequencies. Any decent
spectrum analyzer will easily resolve these components.
Communications receivers with narrow bandwidth, sharp cutoff filters
can also resolve them, of course.

And only "in that time"? You still can: there are plenty of AM
stations broadcasting in the 0.5MHz to 30MHz range (and some outside
that). But in 1915, it may well have been easier to analyze the
signal mathematically than with hardware. The hardware may not have
been very common, but certainly the math identities required were
readily available, as was Fourier analysis.

What if both sidebands are NOT "saying the same thing"? Then, for
instance, you can broadcast stereo in a way that receivers mixing the
two sidebands will still receive an acceptable mono signal.

Cheers,
Tom

"K7ITM" wrote
...
On Dec 21, 9:13 am, "Szczepan Bialek" wrote:
"Well, it's like this. The story starts in 1915, when mankind discovered
sidebands. Now possessing this superior understanding of the AM signal,
radio scientists began to understand the implications of their discovery.
Soon afterwards, our old friends at Bell Labs, who have discovered
practically everything, developed a method for removing one of the
sidebands
of an AM signal but retaining all the essential modulation components. As
an
expert of that day supposedly said, "both sidebands are saying the same
thing" (Goodman, 1948). "
From:http://www.hamradiomarket.com/articles/SSBHistory.htm

I was born after 1915. I am supposing that in that time was possibility
to
tune to the three different frequences.
Am I right?
S*

Only three? If the modulation is a complex signal (not just a single
sinusoid), you'll get (ideally) a carrier on a single frequency, and
upper and lower sidebands spanning a range of frequencies. Any decent
spectrum analyzer will easily resolve these components.

What was in 1915?

Communications receivers with narrow bandwidth, sharp cutoff filters
can also resolve them, of course.

Have such Author of SSBHistory in 1915?

And only "in that time"? You still can: there are plenty of AM
stations broadcasting in the 0.5MHz to 30MHz range (and some outside
that). But in 1915, it may well have been easier to analyze the
signal mathematically than with hardware. The hardware may not have
been very common, but certainly the math identities required were
readily available, as was Fourier analysis.

What if both sidebands are NOT "saying the same thing"? Then, for
instance, you can broadcast stereo in a way that receivers mixing the
two sidebands will still receive an acceptable mono signal.

I am trying to find if that SSB from 1915 were the distance dependent.
S*

On
What if both sidebands are NOT "saying the same thing"? Then, for
instance, you can broadcast stereo in a way that receivers mixing the
two sidebands will still receive an acceptable mono signal.

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

Jeff

On Wed, 22 Dec 2010 10:38:54 +0000, Jeff rearranged some electrons to say:

On
What if both sidebands are NOT "saying the same thing"? Then, for
instance, you can broadcast stereo in a way that receivers mixing the
two sidebands will still receive an acceptable mono signal.

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

Jeff

He never does.

Uzytkownik "Jeff" napisal w wiadomosci
...

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

From the station.
S*

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

From the station.
S*
________________

Radio waves behaved the same in 1915 as they do now.

The distance to a given field intensity, for the same conditions,
is the same now as it was then.

On 22/12/2010 17:10, Szczepan Bialek wrote:

Uzytkownik "Jeff" napisal w wiadomosci
...

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

From the station.
S*


If you tell us where you are and which station you are talking about
we might be able to find the distance!!

Jeff

Szczepan Bialek wrote:

Uzytkownik "Jeff" napisal w wiadomosci
...

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Distance from where? You are not making sense.

From the station.
S*

The modulation used has nothing directly to do with the distance a signal
is usefull. That is determined, at a given power and state of the the
ionosphere, mostly by signal to noise ratio which is influenced by the
bandwidth of the modulation method but not by the modulation method itself.

Electomagnetic propagate works the same today as it did in 1915 or even
30,000 BC if anyone had been around with a radio.

You are a babbling idiot.


--
Jim Pennino

Remove .spam.sux to reply.

Szczepan Bialek wrote:

I am trying to find if that SSB from 1915 were the distance dependent.
S*

Babbling gibberish.

SSB was a laboratory curiousity in 1915 and was little more than a set
of equations.


--
Jim Pennino

Remove .spam.sux to reply.