Using fldigi on linux you can send CW via either your key line or via the sound card. Apparently the problem with using the sound card is possible poor opposite sideband suppression with filtering SSB generation schemes, which can result in a CW signal on the opposite sideband. I am using the key line - it is amazing to see the computer key the CW, and having macros allows for a great reduction in the amount of typing.
I experimented with CW receive with fldigi and got good results with strong signals once the speed was around 15 wpm. Running at slower speeds the decoder appeared to lose sync. Farnsworth mode seems to make it worse as well.
In my research, I found a field of study called CCW (Coherent CW). This was typically 12 wpm cw that had a special starting pattern and also an idle pattern. No doubt 12 wpm was some sort of magic number that they found worked the best. Then further reseach led me to find that CCW eventually mutated into PSK31.
I am still working on my aural CW reception capabilities - and using the computer still feels like cheating, especially for sending.
73 de Brett VK2TMG
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