That device will be a weapon, won't it?
"Korben Dallas" <no@[EMAIL PROTECTED]
> wrote in message
news:eme5e.51927$cg1.48216@[EMAIL PROTECTED]
> 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.
>
>
