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Re: [TowerTalk] OT but relevant

To: towertalk <>
Subject: Re: [TowerTalk] OT but relevant
From: Patrick Greenlee <>
Date: Thu, 25 Feb 2016 13:40:41 -0600
List-post: <">>
Roger, you should run the welding leads twisted together to form a twisted pair as much as possible. Bring the leads to the weld site from in front of you not past you to the site. Clamp the ground clamp as close as possible to the weld site. Don't put your body any closer to the weld site than absolutely necessary. Don't exceed about 160 amps.

The above is from the Medtronic folks who made my ICD. I'm exploring the possibility of a mu metal shield, mu metal as made into fine strands and woven into flexible cloth to be worn beneath my welding leathers.

I have to avoid magnetic fields near my ICD as it has a switch inside that is magnetically operated so a tech can "flip" the switch with a small hand held magnet. Speaker magnets in a cell phone are one no no along with refrigerator door magnets etc.

Patrick        NJ5G

On 2/25/2016 12:45 PM, Roger (K8RI) on TT wrote:

It all depends. I have a defib with a pacemaker back-up. The only restriction was no cell phones in my shirt pocket.
I can arc weld and run the legal limit on any band.
It's been so long that I've forgotten who made it and I don't know where my wife stashed the papers. Most, but not all, of these devices are pretty much RFI proof. I researched the web and found the best claimed RFI proof by I believe it was the Cleveland center (Institute - Clinic). At any rate that was what they use here and max power on HF plus several hundred watts on 50, 144, and 50W on 440 (Legal limit in this part of Michigan) have never bothered it.

They gave me a tutorial on welding which basically said, do not run the cables in front of my chest, but run them up each side. The programming is done via 900 MHz digital I do have a monitor at home that does a diagnostic twice a year and would call home were there an event.

I had a stroke, then 3 years later a heart attack and in 3 more another stroke before "they" discovered the problem was my heart (A-fib) after prolonged elevated heart rate. All came with no advanced warning. So no more climbing, or flying airplanes. Had any of them happened while flying or climbing, I would have been SOL.

73 es good luck.

Roger (K8RI)

On 2/25/2016 Thursday 12:01 PM, Kathy Bookmiller via TowerTalk wrote:
Sorry about this but it may affect many of us eventually.
Yesterday I went for a stress test and got some bad results. I have a left bundle block and they want to me to have a pacemaker implanted ASAP. Obviously this is distressful as I've been in excellent health for my 68 years and now this:( One of my first thoughts was are pacemakers prone to RFI? I asked the surgeon about this and he said he'd never heard of this before in his practice. I'm wondering if any of the readers here have had any experience with pacemakers/RFI issues? I know over the years I've seen references to it in an offhand way but didn't pay much attention as it didn't apply to myself at the time.
My beam is only 20-25' directly above me, as can be seen on my qrz page.
Any thoughts/experiences?
Kathy W2NK

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