I have several XBee 802.15.4 S1’s (w/ 10ec firmware) in the field that are experiencing connection failures. I can have two Xbee’s w/line of sight, and they loose connection in 20 ft. When I get the same pair back to my shop, They work up to 60 ft without line of sight. This leads me to believe there are rf interferance issues that I am not seeing.
These have been working fine for 3 years, and suddenly I am seeing a rash of these connection failures in metropolitan areas, NYC, and LA; and most of them have very dense wifi and audio streaming traffic.
I can not replicate these failures in my shop, nor can I go to where they are installed to do a energy scan.
Can anyone direct me to any literature or a set of guidelines I can follow to mitigate rf interfernce on products sold worldwide without having the ability to change parameters after they are sold?