The powerline networking adapters like HomePlug compatible systems should not interfere with X10 as they use different frequencies:
http://www.hometoys.com/htinews/oct01/interviews/homeplug/reed.htm
There are many other things that could interfere with X10 signaling. Adding new electronic equipment, surge protectors, and UPS's can all contribute to failed X10 signaling. Also, if the X10 transmitter and receiver are an alternate phases of your 220v feed, then the signal must travel all the way out to the street to the transformer, then back again. Adding just one extra TV or satellite receiver can cause just enough interference and signal absorbtion for failure.
If you are serious about X10, you need these everywhere you have high-tech electronics, surge protectors or UPS's:
http://www.smarthome.com/1626-10.html
http://www.smarthome.com/1626.html
And you need one of these:
http://www.smarthome.com/4826a.html
http://www.hometoys.com/htinews/oct01/interviews/homeplug/reed.htm
There are many other things that could interfere with X10 signaling. Adding new electronic equipment, surge protectors, and UPS's can all contribute to failed X10 signaling. Also, if the X10 transmitter and receiver are an alternate phases of your 220v feed, then the signal must travel all the way out to the street to the transformer, then back again. Adding just one extra TV or satellite receiver can cause just enough interference and signal absorbtion for failure.
If you are serious about X10, you need these everywhere you have high-tech electronics, surge protectors or UPS's:
http://www.smarthome.com/1626-10.html
http://www.smarthome.com/1626.html
And you need one of these:
http://www.smarthome.com/4826a.html
