Only when the Receiver cannt hear the other sideband at all.
However add an offset and your computer is the receiver and the
software filters are quite narrow. It can work. It is a very narrow
case of SDR as the computer and software are the detector and
the IF though at audio range has the requisite filters.
No one ever said that a Superhet had to have a IF at some high
frequency it could easily be 2khz for narrow band work.
That is why what you propose for narrow digital signals can work.
by introducing a frequency offset and using a narrow filter to
select the desired sideband. So yes it can work and likely does
for that reason. Just that the solution is still the same but the
means tends to obscure the actual action
The yabut is that apparently everyone is running high stability oscillator
to be exactly on frequency and that makes the right offset an issue.
Of course if the other end is using a SSB radio then the issue it moot
as he is stripping the unwanted image. Likely the case.
I'd use a simple image rejecting mixer scheme and that is passive cheap
and effective enough. Used both ways it also would reduce the offending
unwanted sideband by 20-30db. It works both ways to like equipped
radio for voice work.
Allison
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