Topband: PSK-31

[Rick Karlquist]

> Unfortunately, PSK does not have a constant level envelope ... with  the
> phase inversion (BPSK) it simply can't.  Most sources recommend  running

It is entirely possible to generate PSK signal that has a constant
envelope.  You simply hold the amplitude constant and rotate the phase 180
degrees, instead of holding the phase constant and ramping the amplitude
down to zero, flipping the phase, and ramping the amplitude back up again.
 Unfortunately, the designers of PSK31 chose not to do
this, either because they thought it couldn't be done, or for other
reasons.

Rick N6RK