On a sunny day (9 Jun 2006 10:51:51 -0700) it happened "Telstar Electronics"
wrote in
.com:

Anybody else out there running this mode.
http://soe.unn.ac.uk/ocr/teaching/ppp/DSBSC2/DSBSC.PPT
I really like the performance/benefits...

www.telstar-electronics.com

I have run double sideband suppressed carrier long time ago, but
not on 27MHz, but 4 MHz... half a kilowatt or so....
It is a bit like SSB, but the 'exiter' electronics is much simpler, it
can already be made with 4 diodes in a ring modulator (and 2 transformers).
I made an exiter with 4 diodes, and also one with double triodes (tubes ECC85).

These days it is relatively simple to make a phasing method single
sideband exiter, in those days we had nice xtal filters, xf9A and xf9B at 9Mhz
to filter out the unwanted sideband.

I would call it 'poor man's SSB'.
It is just AM without the carrier.... only the sidebands are used.