OM vu3onx
Its not surprising to let broadcasts sneak into our projects.
Possibly it is being received by your audio board, do examine if it has the proper capacitors on the dc bias to the lm386. Also try headphones to see if it goes away with less audio gain.
Next comes getting into the regulator circuit as Chuck mentions.
Finally, some mention needing a filter to reject medium wave broadcasts in the front of the ubitx. But I am first suspicious of the audio amplifier.
Curt
