Doug Von Gausig wrote:
> On the Drongo, the recordings are just too different to compare. The MD
> seems to be set way too low, or the mic is malfunctioning or the MD is
> malfunctioning. I do see some 60-cycle hum in the Drongo MD recording. Is
> that from an external source, or an indication of a bad connection in the
> MD/Mic connector? Others' opinions?
It does not appear to be specifically 60-cycle hum. By sonogram it's a
whole series of frequency bands, highest level right down at 20hz, but
it continues up to at least 8khz at decreasing intensity levels. Running
a cutfilter can remove most of it while leaving the call, if set about
1.2khz, but not all. A notch filter on 60 cycle did not remove much.
Since the mic ran fine through the shure transformer, it's probably not
anything fundamental wrong with the mic. I'm guessing, and it's just a
guess, that the plug in power or the power supply of the MD is the
source. It seems to be too regular to be a bad connection.
Walt
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