On 2/25/2016 12:16 PM, Jim Brown wrote:
Anecdotally when I was still working in a manufacturing plant we had a
supervisor who was suddenly required to have one implanted. Young guy too.
The guidelines given concerning the punch presses, shears, press brakes,
etc..., was for him to stay a minimum of 15 feet away while the machine
was running. It turns out the second worst offender were the CNC mills
and lathes we had. He wasn't allowed within 25 feet of those.
The worst area for him was the welding shop. He wasn't allowed in it
while we were running. We used Lincoln Power Wave MIG welders which used
pulsed current to keep the splatter down. He wasn't allowed across the
yellow line of our welding shop.
No surprise at all. First, pacemakers are a mature technology, and
there are many potential RFI sources in the public environment, not
the least of which are cell phones, often in very close proximity to
the pacemaker.
Second, RF is coupled by ANTENNA action, and by MAGNETIC coupling. The
pacemaker is, no doubt, designed to minimize both coupling mechanisms,
both of which increase with frequency. If they ill reject a GHz cell
phone a few inches away, they will certainly reject a kW HF rig 100 ft
away.
Let the pacemaker mfr tell you, but the sources I would be concerned
about are poorly designed or defective devices like microwave ovens,
variable speed motor drives, or other devices that create strong
fields in the UHF range.
73, Jim K9YC
73, Jim K9YC
--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441
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