> > Don't go crazy with the output power level, especially if you
> > sit admiring your repeller in your lap !!
> >
> > http://www.gumption.org/mcip/paper.html
> >
> > Ultrasound sub-heading, 2/3 down page
>
>
> Hi Jinx,
>
> Is that supposed to be a joke or a friendly warning?

A little of both. Power lines, cell phones, microwaves -
claims of health problems were at one time dimissed
as scare-mongering. Now look at the safety issues
being raised - brain cancer from cell phones, god-knows-
what from 50/60Hz fields, retinal damage from microwaves
and VDUs...............

Looking around the web you can find no end of claims
that ultrasound repels mosquitoes, with products priced
anywhere from 6.99 to 49.99. But are they any good ?
Does ultrasound really repel mosquitoes ? Does the
sound of a dragonfly really repel mosquitoes ? I am
sceptical that a simple electronic device can convincingly
imitate natural sounds well enough. For instance, if so
many millions of people are affected by malarial mosquitoes,
why can I find no reference to any concerted effort to
distribute electronic mosquito repellers by WHO or UN or
some other organisation. If they can be sold at retail level
for 6.99, what price could you expect in bulk ? $1 ?

If someone can prove that simple EMPs work, and which
bugs they work on, I'll happily eat my hat, with every word
here sprinkled on it

=================================================

http://nature.gardenweb.com/forums/load/cooking/msg011449255764.html

I received one of those electronic mosquitoe chasers. It advertises
an ultrasonic method of keeping mosquitoes away. It also claims
to work in a radius of 16 ft. (800 sq ft) but on the package it claims
25 sq ft or a radius of 2'9". A wopping 32 X differance. I would bet
the lawyers required the lower number.

Anyhow this anoying little thing buzzes and wistles in the very
hearable sonic range. I found it more annoying than a Northern
Ontario moose sucking swam of mosquitoes

Has anyone used these things and do they really work?

Thanks

Jeff

=============================================

I've seen stories similar to this in New Zealand, notably
several non-performing products examined on a consumer
affaris show

http://www.plant.uoguelph.ca/riskcomm/archives/animalnet/1998/6-1998/an-6-30
-98-1.txt

FIRM STUNG FOR 4,000 OVER USELESS MOSQUITO REPELLER

June 30/98

The British Times

A company that sold an electronic mosquito repeller so ineffective
that it put lives at risk from malaria was fined 4,000 yesterday. A
trading standards volunteer who tested the device by using it as he
put his hand into a container holding 30 of the insects was bitten
more than 60 times in 90 seconds. He was bitten fewer times when
the test was done with the repeller switched off. An official report
on the device concluded that it had no effect in repelling mosquitoes.
People who used the repeller would put their lives at risk from
malaria if they did not use other forms of protection. Innovations
(Mail Order), the company responsible for selling 10,000 of the
7.99 Mosquito Repeller, had pleaded guilty at an earlier hearing at
Winchester Crown Court to applying a false trade description

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads