Chris,
Until you can do this repeatedly and the results are the same, you have
only demonstrated a coincidence.
Oscar Overton
Product Safety
"Chris Wells"
<radioactive55man
@comcast.net> To
Sent by: <[email protected]>,
[email protected] <[email protected]>
cc
07/29/2008 10:23 Subject
PM Re: RF What-if (was: RE: Another
Cancer Scare?)
Shifting gears all the way down to 60Hz and over to the magnetic field
exposure area.....
I had a set of? high power, wire wound resistors in a bank to disipate
alternating 10 to 20KW of power off a 3 phase 480V bus.
It was a lame means to simulate a field oil pump load for the development
of a pump off controller.
At the end of the day I would run the set up to test out the power meter
and had the resistor array about 6 feet from where I would sit.
(yes I realize that was not smart arc flash wise...)
I found that I was feeling ill like the flu each day at the same time.
I looked at the arrangement of resistors and found that they were very
much in phase and possibly making a large mag field.
I decided that a CRT monitor close the coils would make a magnetic field
detector and found the display to become significantly distorted.
Perhaps there are better sensors but use what you have.
So I moved the array to the other end of the lab away from my desk and ran
the power meters serial link up to my work area to get away from the
fields.
All the symptoms went away.
My co-workers said I was getting sick from the dust burning on the
resistors but I am still cautious.
Chris
From: Cortland Richmond
About 25??years ago I had a 2 meter beam set up on a bay window next to
the shack. The antenna was actually about 10 feet above my head in the 2d
story room, but far enough from the attic roof to turn freely.? Running
about 200 watts, I discovered that pointing the beam North? -and only North
-- I got terrible headaches when operating SSB.
Not on CW.
Some calculations showed exposure in that configuration was close to or a
bit over the then-current limit, or five times the Massachusetts draft
statute. .? I doubt, however, that this was a thermal effect.
Some people who've met me (see you in August) may be thinking "THAT
explains it!"
Phooey on them.
Cortland
KA5S
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