[hpsdr] More on Horton LO

[Guido]

Robert,

Fully digital LO chain for a direct QSD control. I am still caught by your
idea!

Have been thinking that with a high crystal clock it might be possible to
generate every frequency in 0-30Mhz by undersampling the QSD. Since the QSD
is preceded by a bandpass, the spurs generated by the undersampling might be
out of band.

Trying to calculate it, but a clock of 133Mhz is still insuficient to get
frequency steps that are close enough (<50kHz) and the frequency of
undersampling gets to low so the bandpass filter needs to get too tight.
Also tried to model a fractional N with sigma delta compensation but this
did not turned out in anything useful yet.

Guido.
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