I have an ultrasonic device to stop a neighbors dog from barking.
Unfortunately the yards are large and the device is not powerful
enough. I need a really powerful ultrasonic speaker. The ultrasonic
sound needs to broadcast frequencies too high for humans to hear but
dogs must be able to hear it. Can anyone recommended a powerful
ultrasonic speaker system?
Directionality can be as important as power for longer distances,
since the R^^2 law is operative. A small satellite dish (like
DirecTV) could be very effective here for two reasons:
* with lambda of about 1.5 cm at 22 KHz, the sonic halfpower beamwidth
is quite small -- and the directional gain is > 30 dB
* it could be fairly clandestine, because it's hard to tell by looking
where an offset-fed paraboloid like that is really aimed.
Powerful source of ultrasound: if you have compressed air, google on
Hartmann Whistle. One of these made for 22 KHz would be about the
size of a kid's crayon, produces well over 100 dB SPL. One can be
made on a lathe in half an hour.
The idea here is not to injure the dog, but to train it. Responding
blip for yap is not malicious or agressive behavior on your part.
Owners are often not there when dogs bark, which is sometimes why they
bark: they're lonesome. Even if they are there, some don't care
while others are clueless on how to train a dog and require certain
manners.
Just give it a blip per bark until it lears to associate a moment of
OW with each yap. (Doesn't seem loud when I bark, but that echo
sure smarts!") Some dogs learn quicker than others, most will
"get it" eventually.