I've always had noise problems, even with
the CM11a. When I bought the WGL V572 all-
house-codes transceiver a couple of years ago
(
http://www.wgldesigns.com/v572.html), the
difference was no less than astounding.
That's when I finally had a robust system
that worked most of the time, with amazing
range (1000 ft or more). I tried using the
CM15a as a receiver when I first got it, but
it failed miserably compared to the V572; it
won't even work from the next room. I just
keep all codes blocked for it.
The big question for me is why doesn't X10
offer any line filters or phase couplers?
These are very simple devices which I think
they could produce far cheaper than, for
instance, a lamp module. I have built all
my own filters and couplers with good
results and I know they could make a whole
lot of people happier if they added these to
their product line.
Much equipment now contains electronics and
internal filters to protect it. However,
these filters suck down X10 signals
dramatically. When I turn on the breaker
for my cooktop, X10 signals drop to 50% of
their previous level. My computer UPS
completely kills any X10's in the room but
when I install an external filter,
everything works fine again.
X10 could make things a lot easier for
everyone with a proper line of good filters.