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From: vernak@tekcrl.LABS.TEK.COM (Verna Knapp)
Newsgroups: sci.electronics,sci.skeptic,alt.restaurants,misc.consumers.house,rec.audio,rec.pets,sci.bio
Subject: Re: Ultrasonic Pest Repellers
Keywords: pest,fraud
Message-ID: <5123@tekcrl.LABS.TEK.COM>
Date: 27 Nov 89 15:00:58 GMT
References: <31929@buckaroo.mips.COM>
Reply-To: vernak@tekcrl.LABS.TEK.COM (Verna Knapp)
Followup-To: sci.electronics
Organization: Tektronix, Inc., Beaverton,  OR.
Lines: 31

In article <31929@buckaroo.mips.COM> vaso@mips.COM (Vaso Bovan) writes:
>This is about cockroaches, fleas, mice, and assorted pests founds on pets
>and in restaurants.
>
>There has been a lot of advertisement lately of "ultrasonic pest repellers."
>these are devices which emit ultrasonic sound which is supposed to annoy
>pests into leaving the pet/premises.
> ......
>Does anyone know of the U.S. Army tests or other recent scientific tests on
>these devices ?

About 5 years ago the owners of 7 catteries (cat breeding establishments)
banded together to buy a number of these devices at a discount. I bought
2 of them. Some establishments bought more. We all had the same results:

The cats still had the same flea problems. No improvement there.

The humans in the houses with these devices began to develop marital
problems, etc. as a result of subtle increases in the irritability of
the people. In short, everyone got a bit irritable and short tempered.
We could not hear the devices consciously, but the irritability problem
could be turned on or off by turning the devices on or off. It took us
a while to catch on to what was going on, and if I had been the only
person I knew with one I would have blamed the irritability on something
else. 

This isn't a scientific test, of course, but I am sufficiently convinced
of the results to feel obliged to issue this warning.

Verna Knapp
vernak@tekchips.labs.tek.com


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