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Jinx <joecolquitt@clear.net.nz> wrote:
> She's now paying more attention to where the tone is. When
> she takes the dog for a walk down to the beach (she's on the
> outskirts of Brawns Bay, Alan, at the fringe of suburbia), the
> tone disappears when she goes over a ridge (ie out of sight of
> the tower) and reappears on the way back home

You can make an Ultrasound converter. I can't find the diagram. NE602 work
substracting the PLL frequency to the sound frequency. It deliver a sound in
500 to 5000 Hz range. eg setting the PLL in 20KHz you get 20.5 to 25.5KHz in
a range 500Hz to 5KHz.
Perhaps it helps her to triangle the source, and another ultrasounds sources
like gas leaks, water pipes, et cetera. It has a good directivity.
I don't have the complete diagram but I believe you can figured out.

Regards,
Dennis.
ps: You can do the chineese massages, anyway.



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