neazoi
Advanced Member level 6
Hi a question has come into mind related to these HF HAM commercial transceivers. How do these handle the SSB and LSB related to the oscillator frequency? I can think of two cases. It is better to present an example, to understand my question.
For both cases LOSC=10MHz and transmitter baseband modulating audio signal=1KHz tone.
Case 1:
When switching to USB setting, the LOSC remains at 10MHz and the LSB is filtered. Then the transmitter transmits at 10MHz+1KHz (10MHz carrier suppressed and LSB filtered).
Likewise, when switching to LSB setting, the LOSC remains at 10MHz and the USB is filtered. Then the transmitter transmits at 10MHz-1KHz (10MHz carrier suppressed and USB filtered).
Case2:
When switching to USB setting, the LOSC is shifted at 10MHz-1KHz and the LSB is filtered. Then the transmitter transmits at 10MHz (10MHz-1KHz carrier suppressed and LSB filtered).
Likewise, when switching to LSB setting, the LOSC is shifted at 10MHz+1KHz and the USB is filtered. Then the transmitter transmits at 10MHz (10MHz+1KHz carrier suppressed and USB filtered).
Which of the two cases is true, for commercial HF ham radio transceivers?
For both cases LOSC=10MHz and transmitter baseband modulating audio signal=1KHz tone.
Case 1:
When switching to USB setting, the LOSC remains at 10MHz and the LSB is filtered. Then the transmitter transmits at 10MHz+1KHz (10MHz carrier suppressed and LSB filtered).
Likewise, when switching to LSB setting, the LOSC remains at 10MHz and the USB is filtered. Then the transmitter transmits at 10MHz-1KHz (10MHz carrier suppressed and USB filtered).
Case2:
When switching to USB setting, the LOSC is shifted at 10MHz-1KHz and the LSB is filtered. Then the transmitter transmits at 10MHz (10MHz-1KHz carrier suppressed and LSB filtered).
Likewise, when switching to LSB setting, the LOSC is shifted at 10MHz+1KHz and the USB is filtered. Then the transmitter transmits at 10MHz (10MHz+1KHz carrier suppressed and USB filtered).
Which of the two cases is true, for commercial HF ham radio transceivers?