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

[rcaerobob at cox.net]

Some years ago, a friend and I both were on the same channel.  He used Futaba, I had JR.  WE accidentally discovered AFTER a flight, that the OTHER guy had his TX *ON*, antenna extended, in his tray....I had not gotten a single bump while flying.
We then proceeded to do FURTHER testing, and discovered that we could NOT get each others' radios to interfere, we deduced that it was due to the pulse shift direction in the discriminator.

We didn't ever try the experiment AGAIN, but it was worth filing away for future use. (We actually thought it was pretty cool that there wasn't any interference)....
> 
> From: Jerry Budd <jbudd at QNET.COM>
> Date: 2004/11/24 Wed AM 09:48:11 EST
> To: discussion at nsrca.org
> Subject: RE: Measuring Surface Flatness (was "Cabinet Grade Particle
>  Board")
> 
> Especially when you consider that the transmitter antennae is 
> typically removed when stowed in the case.
> 
> Jerry
> 
> >Yes. Maybe not a great one, as the lid is unlikely to be 
> >conductively gasketted, but your transmitter would likely not 
> >interfere with a plane flying on the same frequency.
> >Dean
> >
> >
> >Dean Pappas
> >Sr. Design Engineer
> >Kodeos Communications
> >111 Corporate Blvd.
> >South Plainfield, N.J. 07080
> >(908) 222-7817 phone
> >(908) 222-2392 fax
> >d.pappas at kodeos.com
> >
> >-----Original Message-----
> >From: discussion-request at nsrca.org 
> >[mailto:discussion-request at nsrca.org]On Behalf Of Grow Pattern
> >Sent: Tuesday, November 23, 2004 6:42 PM
> >To: discussion at nsrca.org
> >Subject: Re: Measuring Surface Flatness (was "Cabinet Grade Particle Board")
> >
> >The big question is;
> >
> >"Is my Ali TX case a working Faraday cube????"
> >
> >E.
> >
> >----- Original Message -----
> >From: <mailto:Rcmaster199 at aol.com>Rcmaster199 at aol.com
> >To: <mailto:discussion at nsrca.org>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: <mailto:bob at toprudder.com>Bob Richards
> >To: <mailto:discussion at nsrca.org>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://www.boltlightningprotection.com/Elemental_Faraday_Cage.htm
> >
> ><http://en.wikipedia.org/wiki/Faraday_cage>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/>http://DixieNC.US
> >
> >----- Original Message -----
> >From: <mailto:bob at toprudder.com>Bob Richards
> >To: <mailto:discussion at nsrca.org>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.
> >
> >
> 
> 
> -- 
> ___________
> Jerry Budd
> mailto:jbudd at qnet.com
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> 

Bob Pastorello, El Reno, OK, USA
rcaerobob at cox.net
www.rcaerobats.net

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