Carl,
Bad connection on the power jack, see if you can find another jack from a discarded walwart the fits snugly.
Some have a slightly small hole and can be drilled to enlarge to fit.
Raj
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At 28-02-2018, you wrote:
Hi, I am getting a buzzing coming through the speaker on my bitx40. Oddly this seems to quieten or completely disappear when I wriggle the power in the back of the case?? Could this be ground related? I cant see anything obvious...
Regards Carl.