Volker Tonn wrote:

dxAce schrieb:

Is it selecting a particular sideband?


No. But actually there is no need for that -IMHO-.
Tuning to zerobeat in SSB is easy and rock stable.
Switching to SSB is easily done without shifting. And with some
additional IF-filters you can switch to the bandwidth working best in
conjunktion with bandpass shift.

OK, I was wondering about the ECSS in AM mode.