Ultrasonic

[Korben Dallas]

Hello,

I am requesting help to construct an ultrasonic device that emits sound at
about 25Khz. Unlike most ultrasonic devices, I want the device to carry
sound over 100 feet (or 30 meters) and still be over 140 decibels at 100
feet (or 30 meters).

Does anyone know how I can do this? Plans? Actual devices? Please reply.



All I know of this is that the sirens on fire engines can do this for miles.

 

[Ed ()]

yes it can be done, but it will cost you.

"Korben Dallas" <no@spam.com> wrote in message
news:fme5e.51929$cg1.31095@bgtnsc04-news.ops.worldnet.att.net...
: Hello,
:
: I am requesting help to construct an ultrasonic device that emits
sound at
: about 25Khz. Unlike most ultrasonic devices, I want the device to
carry
: sound over 100 feet (or 30 meters) and still be over 140 decibels at
100
: feet (or 30 meters).
:
: Does anyone know how I can do this? Plans? Actual devices? Please
reply.
:
:
:
: All I know of this is that the sirens on fire engines can do this for
miles.
:
: