I just got my SC1200 system about two weeks ago. There are three zones I am having an issue with and I am sure it is because of RF range. 2 zones are windows and 1 zone is a motion sensor. I am going to try the passive RF repeater but I wonder if the same solution would help boost the RF range for the console maybe placing the wire next to where the antenna is on the console outside of it. Has anyone tried that? Also, would the repeater help with motion sensor, it comes up as tampered on console but I think there maybe RF interference because of where it is located and the signal has to go through a solid wood door. Because of the age of the house and the door is an original door it may have painted over lead paint on it. I did find an article on lead paint interfering with WI-FI signal not sure if that can also be translated to RF signal. If anyone has any suggestions I would be all ears on this one.
I doubt that lead paint significantly interferes with X-10 RF (310MHz) or even WiFi (2.4GHz and higher). If it did, you would find many such references. The lead is too dilute so it would require many, many coats.
As for adding a passive antenna to the console, it can't hurt as Brian posted.
There is a thread here on modifying the antenna...
While I do not recommend this antenna mod (it's unclear if/how the unit is isolated from mains voltage), there are clear photos of the disassembled unit so you can see the location of the internal antenna wire.
I have designed a small PCB w/galvanically isolated RF transformer (300VAC breakdown voltage) mounted to a BNC connector which can be used to safely add an external antenna to X-10 RF devices whether or not the electronics are isolated.
However, in this case, I do not know whether it's possible to find an area clear of components for mounting it. It needs a space about 1"Lx1/2"Wx1/2"H.
In a few days, I'll be looking for a
guinea pig beta tester to try it with the security console. I have no need so do not want to buy one for experimenation