Hey Judd, Some thoughts based on my experience in installing a 3 meter pre-compliance site.
> HELLO, > > I'm planning on installing a screen room and I have a couple of > questions > concerning layout and installation. The purpose of the room will be to > troubleshoot and prescans, repeatability is paramount. We will use a > approved > lab for certifications and verifications. > > 1) With regard to construction, from the mfg. I have look at so far the > sheet > material is basically the same thin gauge zinc steel over particle board > joined with a clamping mechanism. Will this joining system last or does > it > need repeated tighting and testing? For pre-scans, no. If you want to maintain that 100 dB SE you probally will have to check it. People get away with all kinds of "poorly performing" shield rooms because you only need about 40dB to knock down the ambient (assuming you are not next to a big xmittr) If you ever plan to do SE testing and you want data with a "good" dynamic range you will find leaky doors and loose hardware a regular problem. > > 2) I don't have ANSI C63.4- does any one know the distance I need to > keep the > antennas away room? > Are you installing any absorber? If not, well, I think your repeatabilty would be a problem. Assuming you are putting up absorber, a rule of thumb is that the tips of the antenna should be at least 1 meter from the absorber. The antenna should be 3 meters fromthe DUT. > 3) With regard to the table for the UUT- What is the physical > dimensions and > how far should it be from the enclosure.#005#? Table is 0.8 meters high and has a 1.5 meter x 1 meter surface. In principle it should be free of nails, screws and should be as RF transparent as possible. You probally should not use an old desk as a minimum. > > 4) I'm considering a Anti-room- I can't afford a separate room so I'm > considering a partition in the big room. Just received some quotes and > the > cost of the extra door is astounding! Is the anti-room worth the > investment? Again, it depends on what your doing. Just prescans, you probally don't need it. If you want to do mad scientist experiments, it is invaluable. Seriously, any time you want to isolate some support equipment to see what this one piece of the system is doing you will be glad to have that partition. > > thanks > > Judd Stewart > 619.623.6639 > Hope this helps Jim Nadolny AMP Inc.
