Al, check the electret condenser mic element soldering. Polarity is important.
Raj
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At 18-07-18, you wrote:
Just finished wiring my bitx40.
Draws ~350ma with PTT, but no change at all when yelling or whistling into mic. (Dummy load present at all times, so don't suspect final blown.)
I see lots of discussion around this issue, but would appreciate advice on how to troubleshoot.
72/3, Al - va3iaw