On Mon, Aug 25, 2014, at 03:04 PM, BOB wrote: > We do not know the legality of this project but there is some one spying= =20 > on us with a toy QUADCOPTER. It transmits the picture by WIFI. > Is there some way to detect when a wifi signal comes into range and=20 > possibly get a directional fix on it. >=20 > With these things becoming more and more prevalent it would be a nice=20 > product make to mess them up. >=20 Almost any computing platform has wifi scanning apps available. On my phone I have WiFi Analyzer, You can use a deep-fry skimmer for a directional antenna: http://www.instructables.com/id/%22Poorman_s-WiFi%22--USB-adapters-%26-DIY-= cookware-refl/ Pretty much anything you do intentionally to jam the radio signal is probably not allowed. But if you have ever tried to use wifi* in the same room as a microwave oven, it doesn't work so well unless both wifi devices are very close. Perhaps you are hungry for microwaved popcorn every time there's a quadcopter nearby. * wifi that is 2.4 GHz. That used to be everything but no longer. But chances are the cheap quadcopter is 2.4GHz. Bob --=20 http://www.fastmail.fm - The professional email service --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .