[email protected] wrote: > >The tricky bit is that I need to be able to plot a field strength map > >around the room. (We are involved in numerical modelling of this kind of > >situation, and it is required for validation.) I would like to be able > >to have a fairly systematic and repeatable measurement, if possible. > > In my completely un-humble opinion, unless you have an anechoic > shielded room, you're dreaming. I tried exactly this a few years ago, > in my non-anechoic screen room. It turns out that even the tiniest > change would throw everything all off. I'm talking about temperature, > humidity, how tightly the door was latched, whether the EUT was > nudged by as little as one inch (!!!!), whether the cables had been > disturbed, and so forth.
Hmm. Yes, I believe you. But in this case I don't have a SPECIFIC piece of equipment as a source in a room. Rather, I am looking at the radiated field strength in a room due to a cellular telephone base station some distance away, outside the building. I admit that I have not had the chance to get into a lab and try this sort of measurement yet. I think I must do that, and post a note about what happens... Fortunately, I'm only looking at the GSM band. My S.A. has an "occupied bandwidth" measurement. This should give me total power in the band of interest, and I am planning to do a peak hold on that. > things. You end up wasting time discovering that somebody tripped over > the AC cord and changed its position by four inches - instead of > measuring whatever the heck you were trying to investigate. Remember > that many EMC experiments just end up redistributing the RF radiation > pattern, instead of actually reducing emissions. Yip!!! Cheers, Kevin -- ----------------------------------------------------------------------- Kevin Williams, MIEEE Electromagnetic Software and Systems (EMSS) [http://www.emss.co.za] Technopark, Stellenbosch, South Africa email: [email protected] tel/fax: +27 21 880-1880 +27 21 880-1727 ----------------------------------------------------------------------- --------- 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], or [email protected] (the list administrators).
