Note the material is 0.02 inches thick, and if it were mild steel, would provide ample protection. The specs I found on the product reported a blockage of 45 dB at 1 GHz. Nothing is listed for VLF frequencies, although the blockage will be not as good. What I will do is cut a 24″ by 24″ hole out of the top of the box, smooth the edges, glue the gasket down, then prepare a 25″ by 25″ piece of steel that will simply lay on top of the hole. (There will of course be an overlap. The gasket is 3/4 inch wide). Then, perhaps 20 kg of weight will be applied to the “hatch” door when the unit is being used. Virtually any participant will be able to push his or her way out of the box should any urgent need arise. As for a micro air hole, I still have a few days to decide how to handle that one.
(Wonkish) Here is the precise description of the gasket material
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The upload went well. I spent some time looking over the world locations, trying to find or see any unusual patterns. As an example, I…
If any of you live near the DC area, please get in touch with Emily Dufton at firstname.lastname@example.org. She is putting together a piece on the…
Gareth Furby, from BBC TV News London, would like to hear from any Hum Hearers in the London area. You can contact him at email@example.com.
The latest upload is complete and things are looking good. I’m scanning for any obvious problems. If you notice anything askew, or if you use…