At 08:21 PM 11/17/2006, Charles Greene wrote:
Jim and All,
There are phase modulated signals, and there are phase modulated
signals. The phase modulated signals used in PSK31 do need a linear
amplifier, as the phase modulation produces RF with different
amplitudes. I think the modulation
Charles Greene wrote:
when you key a single frequency as
you do in CW, sidebands are created too. In neither case are the
sidebands essential to the information on the signal, and they do not
need to be accurately reproduced.
I beg to differ... a CW signal _without_ sidebands is just a
Alberto,
This is what I said: In neither case are the sidebands essential to
the information on the signal, and they do not need to be accurately
reproduced.
You can distort the sidebands through a non-linear amplifier and you
still have CW.
73, Chas W1CG
At 11:05 AM 11/18/2006, Alberto
Charles Greene wrote:
This is what I said: In neither case are the sidebands essential to
the information on the signal, and they do not need to be accurately
reproduced.
If there were no sidebands, there would be no modulation. They can
and should be minimized, but if they aren't there,
I can't seem to find whether the sdr operates FSK or AFSK.
I prefer FSK for contesting.
-
Don't be a sexist, broads hate that.
-
Bill H. in Chicagoland
webcams at http://24.14.49.4:8080
FireBrick,
AFSK only.
73, Chas
At 11:47 AM 11/17/2006, FireBrick wrote:
I can't seem to find whether the sdr operates FSK or AFSK.
I prefer FSK for contesting.
-
Don't be a sexist, broads hate that.
At 11:49 AM 11/17/2006, Jerry Flanders wrote:
I was thinking of RTTY, and the effect on the transmitted signal if
the signal supplied to the (non-linear final) amp has any distortion
at all, which is then made even worse in the amp.
Or, asked another way, what would be the distortion limit of
Jerry,
A RTTY signal consists of two CW signals at different frequencies
transmitted one at a time. When you switch from one frequency to the
other sidebands are created, but when you key a single frequency as
you do in CW, sidebands are created too. In neither case are the
sidebands
Jim and All,
There are phase modulated signals, and there are phase modulated
signals. The phase modulated signals used in PSK31 do need a linear
amplifier, as the phase modulation produces RF with different
amplitudes. I think the modulation index is 90 degrees which does
have a spectrum
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