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

[Ken Thompson III]

Now that's funny, Keith,

Ken
  ----- Original Message ---
  From: Keith Black 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 23, 2004 4:31 PM
  Subject: Re: Measuring Surface Flatness (was "Cabinet Grade Particle Board")


  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.


        Bill Glaze <billglaze at triad.rr.com> wrote:
          Bob:
          Do I recall when such a room as you describe was known as a "Faraday Cage?"  Or am I having one of RvP's "Senior Moments?"  (No offense, Ron! O:-) ) 
          Bill Glaze

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