FYI,
Reference to ANSI C63.4 - for Site Attenuation , Antennas and -4.4.2 Antenna calibration. Reference antennas - shall be calibrated in accordance with the methods specified in ANSI C63.5-1988 and ANSI C63.5-1998 (30 MHz to 1GHz). Antennas for use at or above 1 GHz sall be calibrated in accordance with one of the methods in ANSI C63.5 - 1998 or IEEE Std 149-1979. Thanks Joshua Kim Senior Regulatory Engineer Welch Allyn 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Tel. (315) 554-5289 Fax (315) 685-2532 e-mail: [email protected] web: www.welchallyn.com Ken Javor <ken.javor@emccomplia To: "'emc-pstc'" <[email protected]> nce.com> cc: Sent by: Subject: Re: Normalised Site Attenuation owner-emc-pstc@listse rv.ieee.org 09/15/2004 10:15 PM I don't have the latest C63.4, but technically it is pretty straightforward why you cannot verify an NSA with a site source. An NSA has to be made with a matched set of antennas because the antenna factors for the antennas are determined using a matched set. By matched I don't mean identical like balancing pistons, but two antennas of the same type, like two biconicals of the same dimensions, or two log-periodics of the same dimensions. If the NSA were made at such a distance that the two antennas were truly in each other's far fields and each antenna were immersed in a plane wave, then you could use whatever source you wanted, as long as the (far field) gain were specified. But that is not the case. To see this, just go to the ETS-Lindgren web site and compare 1, 3, and 10 meter antenna factors for the same antenna. http://www.emctest.com/product_Results.cfm?producttype=Antennas&applications =All%20Applications&test_types=All%20Test%20Types&standards=All%20Standards For example, look at gains and antenna factors for the 3104C biconical and the 3147 log-periodic. Ken Javor This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/listserv/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
