How will you know you need to calibrate your BFO?

1. Tune to 7074 using LSB. You should hear nothing.
2. Change to USB and you should hear all kinds of PSK and other digital modes. If you hear these signals in LSB then your BFO frequency is not correct, and may even be placed on the wrong side of the passband.

My BFO was way off after I first tried to calibrate it. I then started over with mine at 996.4 and ended up at 996.7. If yours is a long way off from that then I’ll bet you hear psk at 7074 when in LSB.

Reference