Uzytkownik "Richard Fry" napisal w wiadomosci
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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.

Look at the damped waves: http://en.wikipedia.org/wiki/Damped_wave

The damped waves pulses are simillar to AM (amplitude of oscillation
decreases/increases with time).

The decreasing/increasing may be sharp or gently.

The old damped waves " transmissions have a wide bandwidth".

Was the bandwith the distance dependent?
S*

Look at the damped waves: http://en.wikipedia.org/wiki/Damped_wave

The damped waves pulses are simillar to AM (amplitude of oscillation
decreases/increases with time).

The decreasing/increasing may be sharp or gently.

The old damped waves " transmissions have a wide bandwidth".

Was the bandwith the distance dependent?
S*

Damped waves bear little or no similarity to AM, they are essentially
pulses with a very different spectral content.

Being pulses the spectral content is wide, tending to infinite, and yes
I suppose that the spectrum received by a distant station will vary
depending on distance; the lower level spectral lines that are spaced a
long way from the fundamental will be lost below the noise as you get
further away or the signal gets weaker due to propagation changes. The
more side-bands that you loose the slower will be the rise and fall time
of the received pulse.

AM is very different the spectrum is much more contained and only 1
side-band is required to replicate the waned signal.

Jeff

Szczepan Bialek wrote:

Look at the damped waves: http://en.wikipedia.org/wiki/Damped_wave

The damped waves pulses are simillar to AM (amplitude of oscillation
decreases/increases with time).

Only to someone who hasn't a clue what they are talking about.

The decreasing/increasing may be sharp or gently.

The old damped waves " transmissions have a wide bandwidth".

Was the bandwith the distance dependent?
S*

Word salad gibberish.


--
Jim Pennino

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