Andrea,
As I understand mixer operation, the signal that has the lower frequency is inverted.? If that holds true, the first IF inverts to LSB, and then the second IF would invert again if the LO is above 45 MHz.? If it is below, the signal is not inverted.? The BFO LO is set below the 11.059 MHz crystal filter to take advantage of the steeper slope on the upper edge.? That would mean that any signal remains the same sideband.? ?Assuming all before is correct, you should measure approximately 56MHz for USB and 33MHz for LSB, as you have.
73
Evan
AC9TU
