Re: Digest Number 727
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Paul said that for shielding, different fabrics must be used for different frequency ranges. What has the type of material used got to do with frequency? Don Maisch uses ordinary metal mesh window screen quite successfully, to screen from MW towers at rather close range. You can try inexpensive screen and take readings to see how effective it is. It is true that conductive materials used for shielding can easily pick up local electrical pollution frequencies from building wiring, water pipes, etc. and rebroadcast them. Regards, Shivani [Non-text portions of this message have been removed] |
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So how do you prevent shielding from conducting?
And is there any way to protect from pipes except shielding in that area? Paul [hidden email] wrote: Paul said that for shielding, different fabrics must be used for different frequency ranges. What has the type of material used got to do with frequency? Don Maisch uses ordinary metal mesh window screen quite successfully, to screen from MW towers at rather close range. You can try inexpensive screen and take readings to see how effective it is. It is true that conductive materials used for shielding can easily pick up local electrical pollution frequencies from building wiring, water pipes, etc. and rebroadcast them. Regards, Shivani [Non-text portions of this message have been removed] SPONSORED LINKS Health and wellness Health wellness product Health and wellness program Health promotion and wellness Health and wellness promotion Business health wellness --------------------------------- YAHOO! GROUPS LINKS Visit your group "eSens" on the web. To unsubscribe from this group, send an email to: [hidden email] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. --------------------------------- [Non-text portions of this message have been removed] |
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In reply to this post by SArjuna
The sheilding of the mesh window screens does work. I need to find out if there are any inexpensive ways to shield with fabrics you can buy at the local wal mart. And the mail sheathing used in the UK is a good place. Can someone give me a place to buy some? Peggy
-----Original Message----- From: [hidden email] To: [hidden email]; [hidden email] Sent: Fri, 2 Jun 2006 21:32:45 EDT Subject: Re: [eSens] Digest Number 727 Paul said that for shielding, different fabrics must be used for different frequency ranges. What has the type of material used got to do with frequency? Don Maisch uses ordinary metal mesh window screen quite successfully, to screen from MW towers at rather close range. You can try inexpensive screen and take readings to see how effective it is. It is true that conductive materials used for shielding can easily pick up local electrical pollution frequencies from building wiring, water pipes, etc. and rebroadcast them. Regards, Shivani [Non-text portions of this message have been removed] Yahoo! Groups Links ________________________________________________________________________ Check out AOL.com today. Breaking news, video search, pictures, email and IM. All on demand. Always Free. [Non-text portions of this message have been removed] |
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[hidden email] wrote:
> The sheilding of the mesh window screens does work. Of course, you need to specify the materials that the screens are made of. In the old days, I believe window screens were primarily made of aluminum. These days, I believe they are primarily made of vinyl. Marc |
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In reply to this post by pegpare9
We tested various metal window screen meshes. Found that aluminum worked
much better than brass. Even so, the best aluminum gave about 10 dB reduction. Mesh size does matter. The smaller (finer) the mesh, the better the attenuation... especially at higher frequencies. Also, we tested various metallized fabrics and meshes from fabric stores (including Wal-Mart). We found some that offer a modest amount of shielding (50-80%). However, we noticied that the orientation of the fabric made a big difference. In other words, the performance of the fabric changed when the fabric was rotated 90 degress. This is because the metalization is not consistent. More in warp direction than in the other. Emil > The sheilding of the mesh window screens does work. I need to find out > if there are any inexpensive ways to shield with fabrics you can buy at > the local wal mart. And the mail sheathing used in the UK is a good > place. Can someone give me a place to buy some? Peggy > > -----Original Message----- > From: [hidden email] > To: [hidden email]; [hidden email] > Sent: Fri, 2 Jun 2006 21:32:45 EDT > Subject: Re: [eSens] Digest Number 727 > > > > Paul said that for shielding, different fabrics must be used for > different frequency ranges. What has the type of material used got to > do with frequency? > > Don Maisch uses ordinary metal mesh window screen quite > successfully, to > screen from MW towers at rather close range. > > You can try inexpensive screen and take readings to see how > effective it > is. > > It is true that conductive materials used for shielding can easily > pick > up local electrical pollution frequencies from building wiring, water > pipes, etc. and rebroadcast them. > > Regards, > Shivani > > > [Non-text portions of this message have been removed] > > > > > > Yahoo! Groups Links > > > > > ________________________________________________________________________ > Check out AOL.com today. Breaking news, video search, pictures, email > and IM. All on demand. Always Free. > > > [Non-text portions of this message have been removed] > > > > > > Yahoo! Groups Links > > > > Best Regards, Emil DeToffol Less EMF Inc. tel: +1-518-432-1550 [hidden email] |
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Thanks, Mr. Detoffol. Your site is wonderful for information. Keep up the good work, and God Bless. Peggy
-----Original Message----- From: EMIL DETOFFOL <[hidden email]> To: [hidden email] Sent: Fri, 9 Jun 2006 08:06:04 -0400 (EDT) Subject: Re: [eSens] Digest Number 727 We tested various metal window screen meshes. Found that aluminum worked much better than brass. Even so, the best aluminum gave about 10 dB reduction. Mesh size does matter. The smaller (finer) the mesh, the better the attenuation... especially at higher frequencies. Also, we tested various metallized fabrics and meshes from fabric stores (including Wal-Mart). We found some that offer a modest amount of shielding (50-80%). However, we noticied that the orientation of the fabric made a big difference. In other words, the performance of the fabric changed when the fabric was rotated 90 degress. This is because the metalization is not consistent. More in warp direction than in the other. Emil > The sheilding of the mesh window screens does work. I need to find out > if there are any inexpensive ways to shield with fabrics you can buy at > the local wal mart. And the mail sheathing used in the UK is a good > place. Can someone give me a place to buy some? Peggy > > -----Original Message----- > From: [hidden email] > To: [hidden email]; [hidden email] > Sent: Fri, 2 Jun 2006 21:32:45 EDT > Subject: Re: [eSens] Digest Number 727 > > > > Paul said that for shielding, different fabrics must be used for > different frequency ranges. What has the type of material used got to > do with frequency? > > Don Maisch uses ordinary metal mesh window screen quite > successfully, to > screen from MW towers at rather close range. > > You can try inexpensive screen and take readings to see how > effective it > is. > > It is true that conductive materials used for shielding can easily > pick > up local electrical pollution frequencies from building wiring, water > pipes, etc. and rebroadcast them. > > Regards, > Shivani > > > [Non-text portions of this message have been removed] > > > > > > Yahoo! Groups Links > > > > > __________________________________________________________ > Check out AOL.com today. Breaking news, video search, pictures, email > and IM. All on demand. Always Free. > > > [Non-text portions of this message have been removed] > > > > > > Yahoo! Groups Links > > > > Best Regards, Emil DeToffol Less EMF Inc. tel: +1-518-432-1550 [hidden email] ________________________________________________________________________ Check out AOL.com today. Breaking news, video search, pictures, email and IM. All on demand. Always Free. [Non-text portions of this message have been removed] |
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