Help! Need to build a 60hz shield

Re: Help! Need to build a 60hz shield

PostBy: Yanche On: Sun Sep 19, 2010 7:52 am

Guy's you are wasting your time. Re-read my first post on this thread. It's post #2. You need a mu metal shield, high permeability metal. Electromagnetic compatibility analysis, design and solutions are not problems likely to be solved by tinkering. You need to first understand the physics of the problem.
Yanche
 
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Re: Help! Need to build a 60hz shield

PostBy: mozz On: Sun Sep 19, 2010 8:38 am

Things are often fixed by tinkering. You don't need a piece of paper (degree) to be able to design electronics or solve AF-RF problems. The problem here i very much doubt is 60hz.
mozz
 
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Re: Help! Need to build a 60hz shield

PostBy: Machinist On: Sun Sep 19, 2010 11:54 am

mozz wrote:Things are often fixed by tinkering. You don't need a piece of paper (degree) to be able to design electronics or solve AF-RF problems. The problem here i very much doubt is 60hz.


I agree. 60 hz is all around us. Our entire power grid is 60 hz. And many problems, technological improvements have been been made by enthusiasts "tinkering". One group of such people are Amateur radio enthusiast also known as HAM radio operators.
Machinist
 
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Re: Help! Need to build a 60hz shield

PostBy: Yanche On: Sun Sep 19, 2010 8:26 pm

mozz wrote:Things are often fixed by tinkering. You don't need a piece of paper (degree) to be able to design electronics or solve AF-RF problems. The problem here i very much doubt is 60hz.

Yes, tinkering often does solve problems, but the problems tinkering has solved are not modern day technology problems. When's the last time a tinkering solved a failed ECM in your car? The bottom line is education, understanding the fundamentals is what's needed to solve, complex problems today. Notice I did not say schooling, I said education. Education can be formal schooling but almost always it's self study especially decades after you have graduated. What I always try to do in my posts is point the questioner in the right direction. Your mileage may vary.
Yanche
 
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Re: Help! Need to build a 60hz shield

PostBy: rockwood On: Sun Sep 19, 2010 10:26 pm

mozz wrote:The problem here i very much doubt is 60hz.

I don't believe that's the problem either. I could be wrong but there are many many thousands of converters everywhere and if they were causing issues with pacemakers it would have been discovered. I sent a PM offering to help snuffy troubleshoot the problem but haven't gotten a reply.
rockwood
 
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Re: Help! Need to build a 60hz shield

PostBy: snuffy On: Sun Sep 19, 2010 11:00 pm

Rockwood,

I don't always login to read all the resource rich info located here. I just read and replied to your PM. My tinkering is because I'm trying to limit expenses in solving this matter. Solving the problem is secondary for me right now because much of my time is spent researching how this problem is occuring. I was hoping the KISS method would apply but it dosen't.

Yanche is most correct with respect to the mu metals. It's been a trying and time consuming experience to cram a two semester physics course into the last two months. My next two great reads are Foundations of Electromagnetic Theory and Classical Electromagnetic Radiation. One would think medical science would have figured this out by now but as my medical advisor noted, they aren't!
snuffy
 
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Re: Help! Need to build a 60hz shield

PostBy: rockwood On: Sun Sep 19, 2010 11:42 pm

snuffy wrote:I just read and replied to your PM.

Didn't receive it yet. :(
rockwood
 
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Re: Help! Need to build a 60hz shield

PostBy: snuffy On: Wed Sep 22, 2010 10:46 pm

Rockwood,

This site's email shows my message was sent. Just wanted to make sure your got it Sunday night.
snuffy
 
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Re: Help! Need to build a 60hz shield

PostBy: Lumberjack On: Thu Sep 23, 2010 7:35 am

I seriously doubt you have a problem at 60 hz. Walking anywhere near a power company transformer would expose you to many times the levels you would get from a cable box.

More likely your cable box is defective or not grounded properly. In order to recieve the cable signals your box generates RF and is probably leaking it. I would suggest making sure the ground circuit in your house is in fact grounded properly and that the outer sheild of the cable is also connected to it.
Lumberjack
 

Re: Help! Need to build a 60hz shield

PostBy: snuffy On: Thu Sep 23, 2010 11:13 pm

Lumberjack,

Power transformers are a problem in this case as are power substations. Safely assume I have double digit years in cable TV and well aware of the grounding issues. It is the digital converters without question. I 've tried nearly every generation of converters used by this provider over the last three years. Analog TV causes no problem which is why it hasen't been a problem up till this point. Analog was dropped (or just about every channel save shopping channels) in favor of expanding the digital tier.

I have found a supplier for the MU metal as Yanche suggested. I'll have to drop atleast $190 for a sample of their product, then build a containment sphere for the device. That in theory should reduce the magnetic field that is generated.
snuffy
 
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