Gary & Elliott:
Back around 1978, before we had learned a lot of hard lessons about what constitutes a good OATS, I tried using a 100' by 30' by 15' high tent (sort of like a canvas Quonset hut) as a cover on an asphalt pad and hardware cloth proto-OATS. Although the concept was good, I found that rain and dust and pollution created patchy "regions" of slightly reflective, not quite free-space. (Maybe a different membrane material would have worked better than the rubberized canvas I used. A windstorm finally ended my agony.) But if you wanted this tent to be a shield, then I would think that any decent shield (like a metalized plastic film) would be a nasty reflector. If all you wanted was shielding, then OK, it would be like a reverberant chamber minus the paddles. But the inside reflections would be catastrophic if you wanted an equivalent to an OATS. Any method I can think of to reduce the internal reflections would seriously bulk up the mass and/or weight of the tent membrane. Still, you want to keep an open mind. If somebody can show you a tent structure that yields a 10-meter OATS volume, then all they have to do is demonstrate the OATS field uniformity and also show a reduction (60 dB would be nice) of external signals from the plentiful FM & TV & other emitters. And then all would be fine, until the wind kicks up. Ed Price WB6WSN Chula Vista, CA USA From: McInturff, Gary [mailto:gary.mcintu...@esterline.com] Sent: Monday, August 12, 2013 8:38 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Standalone EMC Chamber? At last week's EMC symposium there was at least one vendor that was selling EMC "tents" if you will and I don't know how large they were, but I have seen 10 meter tents - but they certainly weren't in a part of the country that has snow. Sorry I don' have the full list of vendors at the show, but if you look up 2013 EMC symposium you should still be able to find the symposium schedule and vendors for the tent guy. I've seen a 3 meter and a 10 meter tent so they exist, but the companies that used them have either moved into an SAC or got out of that business - at least in at the facility that I saw the tent. Sorry no direct answer but again look for the symposium notes and vendor list Gary From: Elliott Mac-FME001 [mailto:fme...@motorolasolutions.com] Sent: Monday, August 05, 2013 8:36 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Standalone EMC Chamber? Thanks, Brian. This sounds like what I am talking about to a degree. The structure would be totally self-supportive and not attached to a building as yours is, but would not be in any parent structure at all [i.e. exposed to the elements. Sure there are code issues as well. This chamber would not be in any building at all - would just be by itself outside. Best regards, Mac Elliott [ ] General Public From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: Monday, August 05, 2013 11:10 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Standalone EMC Chamber? Mac, I'm not exactly sure what you are asking. Stand-alone or not, a 10 meter chamber takes up a lot of space. We have a 10 meter SAC that is supported by its own steal frame structure, meaning, it is not attached to the building. The supporting structure only adds about 4ft to the length and width. I thought they were all built that way, but maybe not. I can send you pictures if that would be helpful. One constructional consideration which is very nice is having the chamber built in a pit so the GRP is at the same level as that area outside the chamber, and there is room under the GRP for your turntable, power cables, etc. That way you can roll large or heavy equipment into the chamber without using an elevator or have to go up steps. Just my 2 cents. The Other Brian From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of Elliott Mac-FME001 Sent: Monday, August 05, 2013 10:19 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Standalone EMC Chamber? Hello group, A colleague of mine mentioned that he had seen a "stand-alone" EMI chamber at a test lab. One of the obstacles we have in getting a chamber is the lack of space in our building and he thought this may be a good solution to our dilemma. I am not aware of any chambers that do not require a parent structure. Are any of you aware of any EMC chambers [3 or 10m - preferably 10m] that do not require a parent building and operate "stand-alone"? Best regards, Mac Elliott [ ] General Public - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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