Dear Jonathan,
Thank you very much for sharing. I have a 3m chamber. What is your or members' comment I should request three or ten meter calibration distance? My concern is: Section 5.1 of ANSI C63.5-2006 (two paragraphs excerpted below for convenience) states "For either use, the measurement distance is 10 m, ..". If calibration being conducted at three meter distance, are the antenna factors still the "near free-space antenna factors"? Could you please share how much antenna factor difference between three meter and ten meter distances? Best regards, Grace " 5. Standard site method (30 MHz to 40 GHz) 5.1 General The Standard Site Method (SSM) (based solely on horizontally polarized measurements) provides antenna factor measurements from 30 MHz to 1000 MHz for both US domestic use and international use. The measurement method is the same in both cases. For either use, the measurement distance is 10 m, the transmitting antenna height is 2 m, and the receiving antenna search heights are from 1 m to 4 m. These dimensions are annotated in Table 2, which provides values for ED max and ide al site attenuation (SA). (Figure 1 provides the measurement geometries.) The SSM for determining antenna factors (Smith [B11]) requires a standard antenna calibration site. This procedure provides near free space antenna factors for biconical dipole, tuned dipole, log periodic dipole array, and linearly polarized hybrid array antennas. For biconical dipole antennas, corrections to free space shall be applied for product measurements and are provided in Annex G. Mutual coupling correction factors for tuned dipoles shall be applied and are provided in ANSI C63.4-2003. The near free-space antenna factors for the remainder of the listed antennas shall be used without further correction for emission measurements as specified in ANSI C63.4-2003. " - 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/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
