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Old Sep 4, 2004, 9:43 PM   #11
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JimC wrote:
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So, I vote we use sonar next (at a frequency notaudible to humans of course, with the ability to disable it around your pets). :-)

Remember those Polaroid instant camera? (have been ~20 years already)
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Old Sep 5, 2004, 12:21 AM   #12
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JimC wrote:
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So, I vote we use sonar next (at a frequency not¬*audible to humans of course, with the ability to disable it around your pets).¬*¬* :-)
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Remember those Polaroid instant camera? (have been ~20 years already)
Oh, I HATE those!!!! They give me a headache when I use them, because I *CAN* hear them. Again you only have limited range with those...I think my Polaroid was 20ft max for the sonar.
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Old Sep 5, 2004, 12:58 PM   #13
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are they operating at arround 40 kHz ?
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