Alan Peake wrote:
Of course, real signals aren't just a single pulse but any CW signal can
be represented as a series of pulses.

I think within the present context, we would say a CW dot
or dash has a transient response at the leading edge and
trailing edge and achieves steady-state in the middle.
I once calculated that it takes about ~30 cycles with
rho=0.707 to get very close to steady-state.
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73, Cecil http://www.w5dxp.com