[Lf] spectral generation through switching

[Hal]

Andre,

I have been considering modes other than QRSS for use with the transmitter
here at this site, but,  as you know it only handles pure off - on carrier 
keying
due to its design.  A while back I gained some experience with using shift
registers to generate various spectra.  The trick is to select a shift
register tap combination and clock speed which produces a waveform with
selected fourier representation.  Using this method you can generate a number
of interesting spectral representations using only the pulsing nature of 
the shift
register. Analytically, the mathematics are difficult but within 
reach.  What I suggest
here is that it should be possible to attach the appropriate shift register 
to the keying
circuit of a CW transmitter and generate a complex waveform, perhaps something
akin to narrow PSK or perhaps some entirely unique waveform appropriate to the
constraints of our environment.  Receiving software capable of recognizing 
a symbol set
constructed from the waveform would have to be written. However, the 
techniques for developing such software is well understood.

It is a little off the beaten path, but then so is LF!

Thoughts?

Hal WB3KDU