On Mon, 3 Oct 2005 21:44:09 -0400, Fred W4JLE wrote:

That would be much easier, simply sweep a modulated oscillator across the
band. With a couple of adjustments it would be easy to emulate a train
whistle, a somewhat universal warning.

That's a better idea than a tone and what has been proposed is a tone and
an electronic pre-recorded message.

Thanks.
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