Not sure how it works but they do exist: http://www.smarthome.com/4813.html This economic X10 Signal Meter is half the price of most test tools on the market, yet is 90% as useful. It can determine if the signal is too low, if there is a signal present, and if there is noise interference. pic microcontroller discussion list wrote: > >In my home, X-10 stuff works every time, Next door, X-10 hardly works at >all. Down the street, X-10 won't work between the first and second floor. >If youy keep fiddling around with it, you can eventually get it to work. >You'll have the same spotty luck with any other powerline protocol. >House wiring is just a poor communication medium. Is there a sensible way of inspecting the X-10 signal at any given wall socket? This would give the potential user of X-10 an idea of the area of coverage they may get in their house... I'd be really interested to know this :-) Alan Embedded Systems Engineer Microtima Ltd Ouseburn Mews 3-7 Stepney Bank Newcastle upon Tyne NE1 2PW Tel: 0191 2304411 Fax: 0191 2304422 -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads