<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR><SMALL>...us[e] a high
> frequency horn of at least 30 watts, a PA amplifier, and a cheap
> audio oscillator (all available from Radio Shack)...you're in
> business.
>
> ...turn the amplifier on and set the amp [oscillator?] to 20KHz. Remember,
> humans cannot hear frequencies above 20KHz and many stop way short of
> that, especially older people. So no one including you will hear the
> noise but that [nuisance barking] dog...</SMALL><HR></BLOCKQUOTE>
Does this sound like a viable system to you sound/electronic engineers?
Anyone know of a weather-resistant horn (something like police use for the sirens) which will reproduce those very high/ultra high frequencies?
Thanks.
NV400-Powered UHF Generator?
Moderator: Dave Mudgett
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Jeff Evans
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Donny Hinson
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Does he onlybbark when you play? Maybe he's not a music lover. 
Seriously, Jeff...there's just one problem. If you can't hear it, how would you know when it was working, if it was loud enough, etc..
No, I don't think you want to do this. There's a lot of potential problems with this kind of thing. For one thing, assuming your amp and speaker would even work at those high frequencies, you still have to worry about ear damage, and cracking glass, etc. (even when it's above the audible range). And, I think you'd have to go susbtantially higher (maybe up to 30 Khz) to get it out of human hearing range and produce the desired effect on ol' shep. You see, you'd have to get it up to his "threshold of pain" (voume -wise) to make him stop, otherwise, he'd just get irritated, and bark more.
A better idea? If the dog is positively a nuisance, make a video tape of the dog and his rukus, and then take those ignorant neighbors and their obnoxious pet to court.
Seriously, Jeff...there's just one problem. If you can't hear it, how would you know when it was working, if it was loud enough, etc..No, I don't think you want to do this. There's a lot of potential problems with this kind of thing. For one thing, assuming your amp and speaker would even work at those high frequencies, you still have to worry about ear damage, and cracking glass, etc. (even when it's above the audible range). And, I think you'd have to go susbtantially higher (maybe up to 30 Khz) to get it out of human hearing range and produce the desired effect on ol' shep. You see, you'd have to get it up to his "threshold of pain" (voume -wise) to make him stop, otherwise, he'd just get irritated, and bark more.
A better idea? If the dog is positively a nuisance, make a video tape of the dog and his rukus, and then take those ignorant neighbors and their obnoxious pet to court.
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Jeff Evans
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The idea of using (inaudible) sound as an aversive stimulus to actually train the animals to behave sure is appealing. Court is so public and messy and opens one up for retaliation. (An assistant district attorney once told me, "Two houses to avoid are the ho-house and the courthouse.")
I have an extra Nashville 400 and wondered if I could use the head to power the kind of system outlined above. I'm not sure what the market is for speakers which reproduce sound frequencies we can't hear. Shouldn't Jack Stoner have two or three of these in his garage?
I guess I can swing by the Shak and watch them look at me funny...
I have an extra Nashville 400 and wondered if I could use the head to power the kind of system outlined above. I'm not sure what the market is for speakers which reproduce sound frequencies we can't hear. Shouldn't Jack Stoner have two or three of these in his garage?
I guess I can swing by the Shak and watch them look at me funny...