Do confirm all is okay from audio output back to the xtal filter output.
At the input side of the xtal filter, proper bfo adjustment is essential so that the carrier falls into the narrow passband.
As these boards are auto assembled,? and tested,? I tend to think that alignment and testing could be the challenge. I don't think we experienced any defects in the 23 ubitx boards in our group build.
73 curt
