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

[Ron Van Putte]

On Nov 23, 2004, at 3:31 PM, Keith Black wrote:

> In other words, if you built your fuse out of this material you'd 
> probably want to run your antenna externally. ;-)

I can remember when some self-styled RF experts were warning of the 
danger of using chrome Monokote, which contains no metal) when running 
the antenna inside fuselages. <BG>

Ron Van Putte

> ----- 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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