John, you wrote,
>This inquisitive newcomer is exploring the possibilities of
>configuring an economical parabolic microphone from a bird feeder
>squirrel guard. What is the "focal point" that I have heard referenced
>here, how critical is it in positioning a microphone inside of a
>parabolic, and how is it measured in relation to the depth and
>diameter of the parabola?
Tune a portable radio between stations so it makes a continuous hash
noise. Put it about fifty feet away. Listen to a mic in the dish on
headphones. Move the dish up and down and left and right to find the
right aim. Move the mic in and out of the dish to find the right
focus. You'll hear it.
-Dan Dugan
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"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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