Larry Jaques wrote:

Hey, maybe I can focus a large parabolic mirror so his yelps will go
back at the owner's house, FINALLY making him hear the damned things.


Welll.. There have been some systems made using two ultrasonic sources,
one modulated, so that the mixed product where the beams cross is in the
audio range. You could have Elvis or space aliens tell him (and only
him, this would not work in a large area) to shut the &^%%! dog up.

Kevin Gallimore

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