Scott
I have a couple thoughts for you quick as they maybe given
that I am trying to go home! :-)
1) Is the interference line-locked? Try triggering off the
line freq once...
2) Is the building`s electrical supply underground? What
are the ground water conditions like around your plant
now, given the time of the year (spring) and being located
near a swamp?
3) If you suspect that there might be a feeder problem, your
local electric company should have a interfence dept where
they will come out and look (with receivers) for leaky
insulators, lightning arrestors, cables or ect. Our 10m
OATS site at Waukesha has had that very same problem.
good luck,
dave garnier
ge medical systems
ultrasound engineering
414-647-4286
ps: the xray tube operates for a very little time, given that
most of the power (kilowatts) goes up in heat. The emc radation
from the tube and cables would therefore be of vary short nature.