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Powerful Ultrasonic Speaker Needed

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?
 
P

Phil Hobbs

Jan 1, 1970
0
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?


Smith & Wessons produce nice loud wide-spectrum acoustic pulses,
including lots of ultrasound. They are also very effective for stopping
dogs barking, but in some localities they may have certain
disadvantages, such as getting you put in jail, or stimulating acoustic
emission from other nearby Smith & Wessons.

If those disadvantages don't appeal to you, and speaking to the
neighbour doesn't work, call the cops each time the dog barks for more
than a few minutes.

Cheers,

Phil Hobbs
 
J

Jim Thompson

Jan 1, 1970
0
Smith & Wessons produce nice loud wide-spectrum acoustic pulses,
including lots of ultrasound. They are also very effective for stopping
dogs barking, but in some localities they may have certain
disadvantages, such as getting you put in jail, or stimulating acoustic
emission from other nearby Smith & Wessons.

If those disadvantages don't appeal to you, and speaking to the
neighbour doesn't work, call the cops each time the dog barks for more
than a few minutes.

Cheers,

Phil Hobbs

Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

...Jim Thompson
 
K

Keith Williams

Jan 1, 1970
0
My 686 barks louder than any dog.
Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

The store owner needs to practice gun control.
 
J

Jim Thompson

Jan 1, 1970
0
[email protected] says... [snip]
Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

The store owner needs to practice gun control.

I presume you mean his marksmanship? It should have been TWO dead ;-)

...Jim Thompson
 
A

Adrian Tuddenham

Jan 1, 1970
0
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?

Record the dog barking and play it back through a loud amplifier on a
timeswitch when you are out for the night but you know your neighbour
will be in.

Then offer to sell him the device so the he can stop his own dog from
barking in future.




Then run....
 
W

Winfield Hill

Jan 1, 1970
0
[email protected] wrote...
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.

It may make the dog bark more. UDT sells ultrasonic
transducers for use in air, but I doubt you'll be able
to create very high sound levels. http://www.udt.com/
 
K

Keith Williams

Jan 1, 1970
0
[email protected] says... [snip]
Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

The store owner needs to practice gun control.

I presume you mean his marksmanship? It should have been TWO dead ;-)

Gun control *is* hitting your target. The shop owner only did a
half-assed job of cleaning the gene pool. ;-)
 
G

GregS

Jan 1, 1970
0
Smith & Wessons produce nice loud wide-spectrum acoustic pulses,
including lots of ultrasound. They are also very effective for stopping
dogs barking, but in some localities they may have certain
disadvantages, such as getting you put in jail, or stimulating acoustic
emission from other nearby Smith & Wessons.

If those disadvantages don't appeal to you, and speaking to the
neighbour doesn't work, call the cops each time the dog barks for more
than a few minutes.


There was just a news report here of a fellow using antifreeze, he just
got 3 years probation.

greg
 
A

Al

Jan 1, 1970
0
Keith Williams said:
[email protected] says... [snip]

Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

The store owner needs to practice gun control.

I presume you mean his marksmanship? It should have been TWO dead ;-)

Gun control *is* hitting your target. The shop owner only did a
half-assed job of cleaning the gene pool. ;-)

When I lived in Montana, the secondary charge for a drunk would be
carrying a loaded weapon within city limits. I think it was a
misdemeanor. At any rate, even though there were a lot bar fights when
the cowboys came to town, nobody EVER drew a gun.

Al
 
K

Keith Williams

Jan 1, 1970
0
Keith Williams said:
[snip]

Yesterday, an armed robber and his girl friend found out not to
attempt an armed robbery in Mesa, AZ.

Man shot dead and girlfriend wounded three times by store owner ;-)

The store owner needs to practice gun control.

I presume you mean his marksmanship? It should have been TWO dead ;-)

Gun control *is* hitting your target. The shop owner only did a
half-assed job of cleaning the gene pool. ;-)

When I lived in Montana, the secondary charge for a drunk would be
carrying a loaded weapon within city limits.

What a silly law. I can understand "shooting under the influence"
being a no-no, but this is silly. Even a properly registered[*]
gun can't be taken into the city? Did they have a gun-check stand
at the city limits?

[*] Another silly idea.
I think it was a misdemeanor. At any rate, even though there were a
lot bar fights when the cowboys came to town, nobody EVER drew a gun.

Never take a gun to a cowboy fight? ;-)
 
P

Phil Hobbs

Jan 1, 1970
0
GregS said:
There was just a news report here of a fellow using antifreeze, he just
got 3 years probation.

greg

I can see that. It's sweet-tasting to people, too, and leaving a dish
out where a child might run across it is definitely A Stupid Move.

On the other hand, some dogs have been known to die from being fed
chocolate. It'd be hard to nail someone for putting 10 Hershey bars in
your front yard.

Cheers,

Phil Hobbs
 
Save your money, dogs also howl in pain, when stimulated with loud
noises. Best to play back the puppies bark with a small time delay, in
the audible range, say 30 milliseconds, so it gets confused. Otherwise
your wasting your time.

Some other poster came up with that idea a year ago and it works well,
we tested it in humans :)

When we have parades in our township with fire trucks lined up for a
half mile, howling is inevitable for all dogs within several miles,
discreet ultrasound from the older air driven sirens is what the dogs
are protesting about!

Steve Roberts
 
D

Don Foreman

Jan 1, 1970
0
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.
 
M

Michael A. Terrell

Jan 1, 1970
0
Phil said:
On the other hand, some dogs have been known to die from being fed
chocolate. It'd be hard to nail someone for putting 10 Hershey bars in
your front yard.


You could end up with a bunch of overweight chocolate lovers fighting
in your yard if you aren't careful! ;-)
 
M

Mike Young

Jan 1, 1970
0
When we have parades in our township with fire trucks lined up for a
half mile, howling is inevitable for all dogs within several miles,
discreet ultrasound from the older air driven sirens is what the dogs
are protesting about!

What more can you tell me about that? Is it just folklore, or is there more
to it? My lab howls along with fire sirens and the large pole mounted one at
the school, every Tuesday at 10:00 AM when they test it, but not the police
electronic ones. No other dog I've known did that, nor do the neighbors'
dogs. (It's more of a low, quiet karaoke than a bay or wolf howl, somewhat
endearing until I read what you wrote. Maybe I'm just not hearing the
ultrasonics.)
 
What more can you tell me about that? Is it just folklore, or is there more
to it? My lab howls along with fire sirens and the large pole mounted one at
the school, every Tuesday at 10:00 AM when they test it, but not the police
electronic ones. No other dog I've known did that, nor do the neighbors'
dogs. (It's more of a low, quiet karaoke than a bay or wolf howl, somewhat
endearing until I read what you wrote. Maybe I'm just not hearing the
ultrasonics.)

Now there's a germ of an idea! There are dog training whistles that are
just ordinary whistles that are built to resonate in the ultrasonic range just
above human limits.

Why not make one of those and power it from an air compressor? I think
you could get a lot more power from that than any simple electronic speaker.

Jim
 
D

Don Foreman

Jan 1, 1970
0
Now there's a germ of an idea! There are dog training whistles that are
just ordinary whistles that are built to resonate in the ultrasonic range just
above human limits.

Why not make one of those and power it from an air compressor? I think
you could get a lot more power from that than any simple electronic speaker.

Jim

Mechanical sirens are much richer in harmonics than electronic
sirens that use loudspeakers.

An ordinary dog whistle doesn't work any better with more pressure.

Google on Hartmann whistle. These operate on a different principle
than dog whistles, but they but are no bigger or more complex and
they can produce some serious ultrasound power using compressed air.
They've been used for popping bubbles, as in controlling foam in
chemical processes, and atomizing liquids with ultrasound. They are
a small enough source to be easily collimated into a narrow beam with
a fairly small reflector -- as, e.g., a DirecTV dish.

This would not be a "here, Rover" whistle. SPL at 50 meters would be
well above the threshold of pain.
 
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