David: I would be very cautious about personal cell phones field intensity measurements . The proximity of the antenna is so close to the body (head) that some field intensity values I've heard about approach 200-500 V/.m. The power from such devices is very low but close proximity puts it in the near field and the jury still seems to be out debating what the actual values are. I know a company in this area is modeling the human head with the intention of re shaping the radiation pattern to offer more protection to the exposed body.
Another area of concern is high powered airport surveillance radar. The fields generated derive from many megawatts of effective radiated power (erp). i.e. power multiplied by antenna gain. Industry Canada produced a paper called the Electromagnetic Compatibility Bulletin known as , EMCAB -1, and it ran into three issues. It was a survey conducted in 1983 and covered the subject of electromagnetic compatibility urging manufactureres to design immunity into their products because of the EM interaction due to proximity effects. It was well conceived and well researched and has a table of all the expected fields to be expected from users of the EM spectrum. It gave quite a bit of detail as to why EMC was desireable and those needs haven't changed much except there are more devices now and more EMC related problems . This is someowhat off the topic of this discussion group but EMC is embedded in any design where safety is of concern. The fields applied to each service are useful design criteria. The point made in the paper was that it is easier to design EMC into a product than try to fix it afterwards. If interested, I can either scan or copy EMCAB-2 for anyone's use. Ralph Cameron EMC Consultant and Suppression of Consumer Electronic Equipment. (After sale) ----- Original Message ----- From: "David Monreal" <[email protected]> To: <[email protected]> Sent: Wednesday, January 12, 2000 7:41 AM Subject: RE: Radiation levels. > Dear answerers, > > thanks for your kind help. > > The real cases have been VERY useful. If you have more of them, please send > the values to me. > > Thanks again. > > > > David > > > > --------- 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).
