re ultrasonic pest repellers stories advice bunk etc in article babb larc sdsu edu babb sciences sdsu edu j babb writes re ultrasonic pest repelling devices the ones i ve seen use piezoelectric transducers driven by a khz swept oscillator is there evidence that insects are actually repelled by these devices can anybody cite gov t pubs or independent lab studies i saw another device that supposedly repels pests by altering the electro magnetic field of your house wiring i suppose they capacitively couple a hi freq signal to the ac wiring and this is supposed to repel pests how by magnestriction of the wiring i dont think so i ve been wondering about this myself the house wiring thing is really hokey there is no doubt that high pressure ultrasound is annoying but to whom given that these devices have been advertised to be effective against everything from insects to rodents to nasty dogs what is to say that my insect repeller won t just annnoy my dog and give me headaches could there be that much selectivity in frequencies have there been any studies on the effects of various pressure levels bands and sweep patterns on various life forms and how effective could they be i certainly would not want to tell anyone that they are safe from nasty dogs because they were carrying a piezoelectric buzzer jeff babb babb sciences sdsu edu babb ucssun sdsu edu programmer sdsu larc kurt a geisel snail quaker rd white pine software inc nashua nh arpa kurtg drycas club cc cmu edu bix kgeisel genie k geisel air n jtw i will not be pushed filed indexed stamped briefed debriefed or numbered the prisoner
