[time-nuts] VLF Phase-tracking receivers.

[Jim Lux]

On 8/10/14, 11:54 AM, Mike Feher wrote:
> Unless on what you were working on it had a different meaning, MSK means
> "Minimal Shift Keying". It is still a PSK modulation of any order, however
> the transition between significant phase locations is not instantaneous,
> but, shaped in various ways to smooth the transition. This results in a
> waveform that has a minimal AM component which then consequently reduces
> spectral regrowth when amplified by a non-linear amplifier. Allows for
> closer channel spacing, and is generally nicer, at the expense of additional
> complexity. 73 - Mike
>

I can also be FSK..
but it's essentially the narrowest band simple modulation that is 
constant envelope.