David,
I was using batteries, but after doing additional recordings its clear that=
the one I posted was getting interference. Here=92s a screenshot from a be=
tter recording: https://www.dropbox.com/s/k76hl2tuvjp3yzy/Rumble2.jpg <http=
s://www.dropbox.com/s/k76hl2tuvjp3yzy/Rumble2.jpg>
I feel a bit foolish. :)
=96 Charles
> On Jun 28, 2015, at 6:52 PM, [naturerecordists] <natu=
> wrote:
>
> > Here=92s a screenshot showing the signal from the dummy mic: https://ww=
w.dropbox.com/s/tfr8kc5aii1sxlt/Rumble.jpg <https://www.dropbox.com/s/tfr8k=
c5aii1sxlt/Rumble.jpg>
>
> Charles,
>
> Looks like good old square wave mains hum with all the odd harmonics to m=
e
> going by the top frequency scale. The even harmonics cancel out in a squa=
re
> wave due to symmetry. Are you using a mains adaptor or is it near one?
>
> David Brinicombe
>
>
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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