Shouldn't be any difference as far as noise. AS far as near band edge, if
you say are on 3.998, 2kc down from 4.00, your transmitted energy is below
that on lower side band. If you switch side bands, you're roughly 3 kc
above and anything above 2 kc puts you out of band. When you switched
side bands on older rigs, some switched filters and others switched the
crystal in the carrier oscilator. If crystals were switched, you actually
moved frequency on receive and transmit because the output of that circuit
is switched. Hope that makes sense.
73
Butch
WA0VJR
Node 3148
Wallace, ks.