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Experiment Update – July 5 2015

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Workers in several specialty metal shops scratched their heads when I explained the type of hatch I need for the VLF radio-blocking unit for the Deming Box experiment. There seems to be nothing that’s widely commercially available. Please do let me know if you can find such an access door. It needs to be 18 gauge mild steel (or thicker), 24 inches by 24 inches, and have handles on both sides of the door. There needs to be full metal on metal contact everywhere. Fire rating is irrelevant.

I wonder if any readers here with technical experience might comment on the possibility of cutting an access hole of sufficient size, and then making the box radio-tight by laying a flat piece of steel – larger than the hole – on top of the hole and pressing it down with a few kilograms of weights. The solution seems a bit “Flintstonish”, but would it work?

I’m open to hearing suggestions on this.

Glen


11 Comments

  1. jimvandamme says:

    I’ve seen quite a few commercial anechoic chambers, and they usually use a RF seal of springy phosphor bronze finger stock. It works well and stands up to years of hard use. It has a V shaped cross section with a little curve to one side, and the flat side can be soldered to the door. You can possibly get bronze door weather seals at your local home store that will work as good, but not as long (they don’t on my house, so I’ve gone to rubber). The other thing to use is a metallized rubber gasket, which is easier to mount; just glue it on.

    You can cut a hole then use that for the door, then build a door frame out of flat stock or angle for the gasket to mate against. You’ll have a nice flush mounting door without having to cut another piece of metal for the door.

  2. anne M. says:

    Due to my ElectroMagnetic Sensitivity, my husband has made quite a few “faraday cages”. One can get radio signal outside my cage, but inside…nothing. It is made of nothing more than fine gauge chicken wire or metal mesh (1.4″). The wire is on all sides, top and bottom, each sheet lapping at least 1 inch. It is important that the wire is flat, so the seams rest/touch each other. The frame is wood. The door is wood framed with metal mesh, with metal flashing around. You seat the door/plug, grasping 2 handles, into the opening, which also has aluminium flashing, thus conductive.

  3. anne M. says:

    The cage does not stop ambien noise, however, just radio signals and EMF’s.

    • Such a cage is of no use, at least if VLF energy is to blame. I’ve written on this point probably a dozen times: high frequency radio waves are easily blocked by a thin layer of foil; VLF radio waves are not. Search for the term “radio skin depth”.

    • This box is not designed to block noise. Please refer to the multiple postings on the Deming Box experiment for more information on that.

  4. Charlie says:

    Hi Glen,
    I somehow managed to miss this post so my reply is probably too late. But it had occured to me that perhaps you could bolt the hatch door on. That is , instead of using weights to hold down a sheet of steel as you described, it could be fixed on with a number of (largish diameter) bolts going around the perimeter of the hatch door. If the bolts were close enough together and solidly tightened down they might exert sufficient force to squeeze close any gaps between the two surfaces. Mild steel is fairly malleable and fine thread bolts can exert a lot of force. Large washers or backing plates of some sort would help distribute the force more evenly. And I suppose if it were possible to machine, or at least clean up the two surfaces beforehand there’d be a better chance of creating a good seal .

    The metal gaskets suggested above could help, but I wouldnt know if phosphor bronze or whatever is sufficiently radio opaque for this application.

    A problem with fixing the door in place with a 20+ bolts or so would be the length of time involved doing them up and undoing them again later, but maybe some kind of power tool could speed up the process.

    Also regardless of how you finally decide to deal with the hatch door thing, I thought it could be an idea, just as a safety measure, to take a portable drill with ypu into the box, so that it there is an unforeseen problem outside you could still drill an air hole.

    cheers charlie

    • George G. says:

      I’m a little worried about the beer you drink up there in New South, Charlie. I hope it’s not full of chemicals, like our Vic Bitter. Drives all the young fellas mad, that’s why I switched to German or Dutch beer. (no chemicals)

      But seriously mate, if I were to put somebody in a steal box and fasten the lid with twenty bolts here in Victoria, the coppers would kick my bum till my nose bled.

      Cheers,
      G.

      P.S. You would get away with it in Darwin, and maybe Adelaide.

      • Charlie says:

        Yeah, I have to admit that I drink the local stuff … which probably accounts for a lot! But as far as I know bolting people in inside steel boxes isn’t illegal yet here in NSW, as long as you remember to let them out later.

        cheers Charlie

  5. thehumco says:

    Forgive me if this has already been done to death, I see it has been mentioned…. but has an anechoic chamber (as in the link) been tried to see if it affects the hum? https://www.bing.com/images/search?q=anechoic+chamber&FORM=IARRTH&ufn=Anechoic+chamber&stid=34fad290-63c9-be10-7c7b-458ee3bfb624&cbn=EntityAnswer&cbi=0&FORM=IARRTH

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