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.

 

[Graham Orme]

In message <Yle5e.51920$cg1.43585@bgtnsc04-news.ops.worldnet.att.net>,
Korben Dallas <no@spam.com> writes

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).

I can't help, well not at those power levels, but I'd like one too to
vaporise the neighbours dog when it barks at quarter to one in the
morning.

--
Graham