Dan wrote:
"No thanks, it works fine with the RR501. The TM751 isn't as good as the RR501. I still have a 751 in my "X10 box", along with my CM11A from AH days."
I hear that a lot about the RR501 versus the TM751, but the first transceiver I owned was a TM751 and it had a better RF receiving range than any of the three highly-touted RR501 units which had been offered to replace it. Reception from one wireless wall switch location in the house was "iffy" with the TM751 but practically zilch with the RR501s.
In an attempt to quantify the difference I had observed in the house (namely that the RR501s weren't up to the job), I ran a 50 ft extension cord from the house to one end of my long driveway. I plugged in either the TM751 or the RR501 with a lamp attached and with the transceiver setting on a box about 2 feet high. Then while alternately clicking the On and Off buttons on a PalmPad I moved further and further away until I could see that the lamp was no longer responding. This was about 8 or 9 years ago and I don't remember all the details, but the RR501 worked out to about 90-100 feet while the TM751 exceeded that by about 20-30 feet. (I swapped the two transceiver units twice to make sure a running-down battery in the PalmPad wasn't an influence, and I held the PalmPalm in the same orientation all the time.)