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- BPSK provides a simple, conversational, highly efficient digital mode -- it easy to receive and easy to send CQ
- Error correction can be incorporated (QPSK) but slows things down and adds little
- There is a bandwidth/speed tradeoff but human typing is limited. If you want to go faster there are PSK63 and PSK128
- Degrades much like CW; gradually gets worse. Lower case is more immune
- Great for DX not so great for contests.