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Faraday Cage?

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FrizzleFried:


--- Quote from: JustMichael on February 17, 2007, 04:40:45 am ---FrizzleFried, do you happen to live on or near a military base?  The reason I ask is that a lot of the frequencies that garage door openers use has been allocated to the military now by the FCC.

--- End quote ---

Nope...closest base is in Mountain Home some 40-50 miles away.   This issue also happened in San Diego,  but I WAS much closer to a military base there (15 miles or so).



FrizzleFried:


--- Quote from: SavannahLion on February 17, 2007, 10:28:17 am ---You have to have a case in order for a motherboard to qualify as an FCC Class B device. Those cutaway side panel with plexiglass windows or those whole plexiglass cases don't pass FCC testing, so don't bother using them.

This paper has a nice description on how to handle and reduce EMI fields http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26003.pdf
It points out some details even I wasn't aware of. Such as it's the length of the gap in the case not the width that causes problems and grounding heat sinks.

--- End quote ---

Thank you VERY much...this info is EXACTLY what I was looking for.   I will report my results when I get a chance to work on that cab....


fixedpigs:


--- Quote from: FrizzleFried on February 17, 2007, 10:33:51 am ---Nope...closest base is in Mountain Home some 40-50 miles away.   This issue also happened in San Diego,  but I WAS much closer to a military base there (15 miles or so).

--- End quote ---

heh...i used to live at mountain home afb back in '84-'86...!

this whole emi thread is very interesting...i never knew...

here's a couple of questions...
when should i be concerned about this...?
how do i know if it's a problem...?


FrizzleFried:


--- Quote from: fixedpigs on February 17, 2007, 11:28:48 am ---
--- Quote from: FrizzleFried on February 17, 2007, 10:33:51 am ---Nope...closest base is in Mountain Home some 40-50 miles away.   This issue also happened in San Diego,  but I WAS much closer to a military base there (15 miles or so).

--- End quote ---

heh...i used to live at mountain home afb back in '84-'86...!

this whole emi thread is very interesting...i never knew...

here's a couple of questions...
when should i be concerned about this...?
how do i know if it's a problem...?


--- End quote ---

I just picked up my Basset Hound puppy from the base (well,  just outside of the base)...

I found out it was a problem when I couldn't open my garage door when my PC was on.  I became concerned about it when my NEIGHBORS couldn't open THEIR garage doors when the PC was on.



tikbalang:

try enabling "spread spectrum" in the bios. this is supposed to reduce emi.

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