Michael Black wrote:
No, the January 1977 issue of Ham Radio magazine, it was the
cover article.
I could never really make sense of the article. My recollection
is that it didn't do a good job on conveying the theory to
the average ham, or even the purpose of such a mode,

I would think it would be for the same reason as SSB for AM? To achieve
half the bandwidth utilization for a given signal? (But at the expense of
3dB poorer SNR...)

I suspect that going through the math for the 'direct generation' means of
SSB-FM would be pretty gnarly, but the 'first generate FM, then add a sharp
filter' approach should work (although this will really generate vestigal
sideband modulation...).

---Joel Kolstad