Ultrasonic xxx effectors where xxx =3D rats, ants, dogs, poverty and
disease and effection =3D removal, killing enrichment etc as appropriate
are about as time honoured  as oxygen free speaker cables and crystal
whatevers.

People are selling a well presented rat repeller here (New Zealand)
for about $150 at present. Well presented by a company that may be
doing OK with traditional systems, such as knocjking them on the head,
or whatever. Or not. Their shaky credibility is furher eroded by
claims of it using "ultrasonic and electromagnetic" methods (or energy
or whatever).

The chase:

           BUT has anyone had any practical experience in successfully
using ultrasonic energy to repell / kill / destroy /  ... anything.

Preferably well controlled double blind against placebo trials with
sample sizes of E6 or more.
But, any input welcome.

It makes some sort of sense that creatures which  have ultrasonic
sensitive hearing or other bodily bits (Martha! - my thorax is
thrumming !!!) may decide to decamp if exposed to suitable ultrasonic
energy levels. Pulsing or not may help or not. So not quite certain
it's wholly snake oil.

Given enough enthusiasm I might manage to fire up something at greater
than usual ultrasonic power levels and give it a go. Ideally I won't
manage to drive our 18 year old Burmese cat to distraction.



                  Russell
--=20
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