I run a TM751 RF transceiver with HR12A keypads, AM466 appliance modules (better for CFLs), and lamp modules for my home automation lighting setup. Recently, most of the modules stopped working. Only the A1 (default for the transceiver) seemed to work properly. Then I noticed that the next closest module for my LED undercabinet lighting was still working. It's about 8' away from the xceiver on the same circuit. Other modules work in the socket, too.
Everything points to something dampening the sig from the xceiver, but how do I check that? Alas, I have no O-scope here.
I recently added 22k resistors to the input of many of the lamp and appliance modules, but everything was working for several weeks afterward, so I'm wont to rule that out.
Anyone here familiar with X-10? Clues would be appreciated.
Oh, I also waited until the fridge and heater were both off to test the working of the modules, thinking they might be producing enough noise to kill the DC sig on the AC line. That made no difference.
I have another TM751 around here somewhere but haven't been able to find it to test with it.