1. If you plug something into the TM751 transceiver you will ONLY be able to control it from an RF transmitter. The TM751 won't respond to X10 signals generated by other transmitters (such as the IR543).

2. Flourescent lamps should ONLY be plugged into appliance modules, never lamp modules.

3. Try turning on any 220v appliances (stove on High, electric dryer, etc.) and see if you can then control something in the LR from the DR or vis versa. If so, your rooms on on different phases and you need a phase coupler. If it still doesn't work then you likely have a noise problem. See [Link: homeautomationnet.com] for a more detailed explaination.

4. Assume that a surge protector will block X10 and introduce noise on your line. It might not always prevent X10 from working but an unfiltered surger surpressor will likely reduce the reliability of your system. I went with a whole-house surge supressor, installed at my CB panel, so that I can avoid having multiple surpressors scattered around the house.