The 200's receiving problems are legendary, some work, some don't. Mine won't receive the temp sensor while in direct line of sight through a window, probably 40'. I tried it all over the computer area and finally found it would receive sitting up in a window in an adjacent powder room where it remained for over a year, I tried it back in the PC area and would set it on the desk about a foot from the 100 which works no matter where you put it. I'd wait for a drop out and move it a few inches until I finally got it under an open space on the wall, then would move it up by slipping books under it until I finally got it to a place I could mount it, took about a week all in all. I've got a new 200 coming in next week, we'll see if it's able to operate there, but it's a Davis later in the year for sure.
