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
