[I'm not sure if this newsgroup is still alive, but here goes.]

This week I finally installed my OldBird 21c microphone and I'm having some
noise issues. In my setting I use a Marantz solid state recorder for my
recordings. When I power this recorder with its standard AA batteries,
things are fine but it does not allow me to record for more than a few
hours. When I use AC power for the recorder instead, a lot of noise shows
up at 1500Hz, 1620Hz, 1740Hz, 1860Hz, etc. Likely this has to do with the
fact that the recorder and the OB21c microphone use the same AC outlet.

What is the best solution to this problem?

Wim van Dam
Solvang, CA, USA

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