'Speaking in Whispers' SPRAT 160, pp 24 7 25, Autumn 2014, is a summary of systems for the generation of WSPR signals outside of the PC environment (and, therefore, suitable in /p and /m applications).
'Working CW from an SSB Phone Rig' SPRAT 159, pp 8:13, Summer 2014, is a description of the methods I have used to work CW (and other digital modes) from my SSB rig, given its flexible DDS-based VFO/BFO combination. A copy of this article can be downloaded from this site.
'RF Generation for Superhets' SPRAT 158, pp 4 : 11 is a collaboration with Pete Juliano, n6qw, on describing the operation of a pair of inexpensive DDS modules as VFO and BFO for a superhet, in which both are under the control of a single microcontroller, giving advantages in alignment &c. A copy of this article can be downloaded from this site.