Why no ASK digital modes?

[gregory21greg]

Why are there no amplitude sift keying digital modes? Or is there one that I'm not aware of? And I'm not saying Morse isn't a digital mode but Morse is hard to copy by computers. Why isn't there a digital mode that uses cw? That could have many applications like for example cw only radios could benefit with extra capability. This would also make getting started with HF much cheaper since CW only radios like qrp kits or even homebrew are cheaper and easier and there would be the added benefit of not having to learn Morse code.

 

[jonwienke]

Amplitude shift keying is more susceptible to noise interference than frequency shift keying, so digital modulations schemes use FSK to reduce bit errors and garbles.

Also, AM bandwidth requirement is based on 2X the highest frequency transmitted, so a super-narrow CW channel can't handle a data rate much higher than Morse code even if using an ASK digital mode. "Digital CW" is either going to have an extremely low data rate (<100 bits/second), be prone to errors, or both.