It is designed to filter out man-made noise like from cars,
electrical devices in your home, malfunction street lights, etc.
I would not count on them to "remove" anything else.
Ron, wb1hga
VR2BrettGraham wrote:
NBs do not work on some noises & all cause the
receiver to wilt from IMDs.
They can take a bite out of some atmospherics &
even stuff like power line noise & the British or
Chinese woodpeckers - not completely, but often
enough to be able to hear what I need to hear
through it.
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