A few years ago I was given the job of assembling two used, damaged, copper-screen shielded rooms into one larger one. I was contacting at the time, and the OT and straight time I put in, could have been replaced for 1/3 of what they paid me if the company had followed my advice and hired an electrician and a carpenter, instead.
I think the room itself will be straightforward. The cones will be hard, and I'd expect to lose quite a few, as the material in older cones seems to crumble away when stressed. You may want to plan on discarding the cones and replacing them with a modern ferrite and RAM substitute -- which will work better. The sections themselves will likely have become compressed, So, in addition to cleaning and replating as elsewhere advised, you may end up using metal tape along seams to build out the thickness to what it was to start with. If you follow the advice to number hardware pieces, the work is no more than tedious. There WILL be leaks. When we had a chamber put in at a former employer, the small leaks were found during 285 testing at 10 GHz. THese were fixed with metal sponge jammed behind the responsible fittings. My copper-screen monstrosity would never get rated attenuation, but 60 dB was enough to do what we had to, and by the time I left the company, that chamber had been moved again, and was still serving. And you know, it's true that if you once do this, you will never want to do it again! Cheers, Cortland ====================== Original Message Follows ==================== >> Date: 20-Apr-99 09:28:31 MsgID: 1067-101916 ToID: 72146,373 From: Robert Macy >INTERNET:[email protected] Subj: Efficacy/cost value of used EMC Chambers Chrg: $0.00 Imp: Norm Sens: Std Receipt: No Parts: 1 Anybody know what it takes to use a 15 year old chamber and whip it into shape for maximum certification capability (3 m range only)? We're talking modular chamber with glued on cones to be dismantled and reassembled (no doubt all the old cones will be lost) Has anyone done this? - Robert - --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators). ====================== End of Original Message ===================== --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
