On Sun, 23 Dec 2001 11:54:19 -0000, you wrote:

I know the reason for adopting LSB on the 1.8 / 3.5 / 7Mhz bands was
to avoid clashing with shared users of the bands but.....

Historical note, I think you will find that upper sideband above 9MHz and lover
below it came about from generating an upper sideband signal at 9MHz and then
either mixing up or down from there, I imagine it was convenient to limit the
tuning range of your oscillator and pick off the sum or difference as
appropriate.

Nick