Hello all, We typically measure in 500 MHz spans, our spectrum analyzer has 400 bits so 1.25 MHz/bit. Concerned that we could miss an emission I perfromed the below experiment, try it:
Injected a 2950 MHz signal into EMI Receiver, set for 1MHz RBW, and measured it using diffrent Spans 3 000 MHz 67 dBuV signal, 400 bits 1 MHz RBW Span [MHz] Amplitude Step/bit [MHz] 10 66 0.025 500 67 1.25 1000 67 2.5 2000 67 5 3000 66 7.5 4000 67 10 6000 67 15 What we see is even with the step size 15 times the RBW the signal is not lost. Regards, Ken Hall -----Original Message----- From: John Woodgate [mailto:[email protected]] Sent: Thursday, December 06, 2001 2:16 PM To: [email protected] Subject: Re: Stepping receiver, step sizes. I read in !emc-pstc that Ken Javor <[email protected]> wrote (in <20011206195802.LCFL6698.femail7.sdc1.sfba.home.com@[65.11.150.27]>) about 'Stepping receiver, step sizes.', on Thu, 6 Dec 2001: >Keeping the step size to one-half the measurement bandwidth is an accepted >way of assuring that all possible signals are captured. Using a step size >equal to a measurement bandwidth is not quite as good but reasonable. In the context of 8, 20 or 80 kHz steps to cover 4 GHz, I think reasonableness wins. One would be extraordinarily unlucky to lose a significant signal under those conditions. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk After swimming across the Hellespont, I felt like a Hero. ------------------------------------------- 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: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- 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: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server.
