True FSK does not require that following amplifier stages be linear.
Any distortion or non-linearity with AFSK will result in a "dirtier"
signal, which will have a negative impact on other stations working
nearby in frequency.
Since no amplifier is perfect, one can always argue that FSK is
likely to be the cleanest mode and is best if band crud is a consideration.
Jerry W4UK
At 04:00 AM 7/22/2008, you wrote:
John Reiser-3 wrote:
>
>
> But, I have a question for you, being a neophyte. Why are you not
> interested in AFSK? Does FSK work better in some way? Let me say, I have
> been very pleased with AFSK so far. I have worked almost any station that
> I
> could hear/print so far.
>
>
That's a good question. I don't know the answer either. I cannot see the
point of using FSK if a sound card is available. It will make no difference
at the other end of the contact, and at your end it means that you have to
tune in the signal you are working to the exact frequency you are
transmitting on, instead of just clicking on it in a waterfall and letting
AFC take care of it.
Some people use an external RTTY terminal unit and I have heard claims that
they can decode better than sound card programs. I can't argue with that,
since I have never done a comparison, but if true I would have thought it
was due to a deficiency in the decoding software. I would have thought that
DSP was capable of doing a better decoding job than any analog frequency
discriminator circuit.
-----
Julian, G4ILO
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