1. Check if si5351 is putting clocks on the bfo and the front end mixers with the oscilloscope.
2. tune away? from the signal generator freq by about 100 khz to preven the IF overload, now switch the xg3 to 0 dbm level. Can you see the signal either side of the lpf?
2. Next, switch to -33dbm and set the freq of the sbitx to the sig gen. Do you see the signal at the output of the IF amp?
