The FCC requested us to do these measurements at the band edge in radiated mode only. Both peak and average.
Lothar Schmidt BQB & Technical Manager EMC/Radio/SAR CETECOM Inc. 411 Dixon Landing Road Milpitas, CA 95035 tel +1 408 586 6214 fax +1 408 586 6299 From: Eric Penne [mailto:[email protected]] Sent: Wednesday, August 06, 2003 8:44 PM To: [email protected] Subject: Apples and ? comparison of dBuV/m I've been perusing some FCC test reports and had a question that I couldn't find an answer to. I'm trying to brush up on my skills so I can get a job in the EMC industry again. Funny thing my former employer told me. I had my picture in the Fall 2002 issue of the IEEE EMC newletter 4 times at the Minneapolis EMC Symposium. Unfortunately I was laid off 1 week after the show. :) Anyway, on a couple of the reports, measurements were taken to verify that a transmitter didn't exceed the limits of a band next to it. The EUT including antenna was tested in a chamber and the maximum value in average and peak testing was found in dBuV/m. The unit is operating above 1GHz. To verify the band edge measurements the transmitter was directly connected to a spectrum analyzer and power measurements were taken to find the overall peak and the peak in the restricted band. The difference of the direct connection Spec Analyzer test was subtracted from the maximum average value in the radiated emissions test to say that the EUT passed in the restricted band. What I couldn't understand was how an average value from the RE scan with a Res BW of 1MHz could subtract a peak value from the power scan that has a Res BW of 100kHz? Is an average value with 1MHz RBW equal to a Peak value with 100kHz RBW? Thanks, Eric This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc 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] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc >>> Download free spam killer at http://eliminatespam.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc 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] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
