Quote:
Originally Posted by heathkit tv
I knew two people with ultrasonic controlled sets who swore that they had poltergeists as their TVs would turn on/off and change channels for no apparent reason. This would invariably happen only at night. No pets with tags on their collars, toilet was far enough away that couldn't cause it...etc. Gotta wonder what else could be making that happen.
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Puzzling - can't think what it might be. Dropped silverware could do it, but it's pretty obvious when that happens. Could it be a whistle in heating ducts?
Maybe someone here has direct experience with some unexpected ultra-sound sources.