Measuring Surface Flatness (was "Cabinet Grade Particle Board")

[Grow Pattern]

The big question is;

"Is my Ali TX case a working Faraday cube????"

E.
  ----- Original Message ----- 
  From: Rcmaster199 at aol.com 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 23, 2004 4:55 PM
  Subject: Re: Measuring Surface Flatness (was "Cabinet Grade Particle Board")


  The tangents that some threads create are often much more interesting than the original intent of the thread. 

  Keith I would say it's not a good idea. If you built a fuse out of this material, (done everyday BTW),  I suggest you build it large enough to accomodate the person flying it (vbg). I know Bill, Don Ramsey and Al Glenn and probably several more, flew or still fly "Faraday Cages" for a living

  Now, how we went from measuring surface flatness to "shielding" devices from EMI/RFI (regardless of what the emitting source is), is beyond me

  MattK

  In a message dated 11/23/2004 4:32:15 PM Eastern Standard Time, tkeithb at comcast.net writes:
    In other words, if you built your fuse out of this material you'd probably want to run your antenna externally. ;-)


    ----- Original Message ----- 
      From: Bob Richards 
      To: discussion at nsrca.org 
      Sent: Tuesday, November 23, 2004 2:59 PM
      Subject: Re: Measuring Surface Flatness (was "Cabinet Grade Particle Board")


      John,

      I disagree. The definition of a "Faraday CAGE", which is what Bill said, is a completely conductive sealed enclosure.

      Also, the edges don't have to be fully bonded together for RF protection. They can be stitched together at intervals depending on how high in frequency you want attenuation. The closer the spacing, the higher the cutoff frequency. Obviously, if you want cutoff up into the gigahertz range, you pretty much need a continuous bond.

      http://www.boltlightningprotection.com/Elemental_Faraday_Cage.htm

      http://en.wikipedia.org/wiki/Faraday_cage

      Bob.


      John Ferrell <johnferrell at earthlink.net> wrote:
        Sorry to get picky, but a Faraday shield is not an electromagnetic field, it is an electrostatic shield. 

        An rf tight room needs the edges fully bonded together and a Faraday shield requires that they be insulated. 

        I think everyone knows what is being said, but I felt obliged to add the detail. 

        John Ferrell   
        My Competition is not my enemy! 
        http://DixieNC.US

          ----- Original Message ----- 
          From: Bob Richards 
          To: discussion at nsrca.org 
          Sent: Monday, November 22, 2004 1:06 PM
          Subject: Re: Measuring Surface Flatness (was "Cabinet Grade Particle Board")


          That's what it is. No RF gets in or out. Something like 110dB attenuation.

          Bob.
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