Hi Caryl, Just curious to know if you tried any experiments with your computers and insect problem. I note that some antenna are useful at fractions of the wave length too, like 1/2 or 1/4 so there is a broader spectrum that could be experimented with there.
Sean On 8 July 2011 18:08, Caryl Bigenho <cbige...@hotmail.com> wrote: > Hi.... > > Let's put this to a test! > > With all the flooding we are having in Montana this summer the clouds of > mosquitos are really fierce! Our family is visiting with their PCs and I > have a Mac. We can try this in the next couple of days and see if it really > works. It says it can be barely audible. I was curious to see how low these > notes would be and found this interesting chart (link below). Many of the > instruments listed are no longer in daily use and exist mainly in museums, > but some, such as the bass viol and bassoon are very common. In fact, my > husband has his bassoon here with him in Montana! But, I don't think he > wants to play a continuous low note... he has better things to do! We can > find an appropriate tone generator for our test. > > http://www.contrabass.com/pages/frequency.html > > <http://www.contrabass.com/pages/frequency.html>Caryl > > > Date: Fri, 8 Jul 2011 15:34:30 +1000 > > From: qu...@laptop.org > > To: s...@lpnz.org > > CC: olpc-ocea...@lists.laptop.org; i...@lists.sugarlabs.org; > sugar-devel@lists.sugarlabs.org; deve...@worldclassproject.org.uk > > Subject: Re: [IAEP] [Sugar-devel] Turn your frequency generator into a > super powerful mosquito repeller > > > > > The speakers don't work very well at the frequency range specified by > > that article for mosquito repelling; 45 Hz to 67 Hz. > > > > The article fails to mention how much sound is needed; e.g. in dBm. It > > gives a subjective measure only. > > > > Other articles on the site mention secrets of ancient geometry and > > crystal harmonizers. This really doesn't impress me. Is there any > > evidence base for repelling mosquitos using low frequency sound? Is > > there any evidence that enough of the population of mosquitos is > > repelled? All it takes is for one strain to not be repelled and it will > > breed up. > > > > -- > > James Cameron > > http://quozl.linux.org.au/ > > _______________________________________________ > > IAEP -- It's An Education Project (not a laptop project!) > > i...@lists.sugarlabs.org > > http://lists.sugarlabs.org/listinfo/iaep >
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