But what he was writing about would be something like a method that
enables a medium power (tunable, not crystal-controlled) transmitter
that, while transmitting SSB, still allows reception of adjacent weak
signals from a receiver connected to a nearby separate antenna. At the
time of Wes's writing, it seemed clear to this reader that Wes believed
this technology didn't exist, at least in the amateur community. Since
his writing I haven't really seen the problem addressed beyond what I
mentioned in my first post, and I was asking if anyone knew anything
more.

Regards,
Glenn Dixon AC7ZN

You're describing the oscillator phase noise problem, and since G3SBI's
unveiling of the "H"-mode mixer, THE compromise to a "perfect" radio.

All oscillators have some degree of phase noise, from a poorly designed VFO,
to a well designed one, (One of the better is Gumms class C design featured
in several of Haywards books). The DDS has VERY little phase noise, but has
substituted serious problems with spurious content in it's spectrum, and use
of a PLL to get rid of those results in phase noise again (outside the loop
bandwidth)

Lots of folks working on it, the same G3SBI has come up with a multiple
resonator VCO for his PLL in the CDG2000. While it has had some technical
criticism, Tibor Hajder has established that the concept is theoretically
sound and results in a faster roll-off of phase noise than the single
resonator approach. (Applied Microwave and Wireless, Oct 2002)

That same problem from the interference caused by the "lousy" transmitter,
will be encountered from the phase noise of the local oscillator of the
"receiver connected to a nearby separate antenna". Unless of course, the RX
is a TRF design with no LO.

W4ZCB