I read in !emc-pstc that Price, Ed <[email protected]> wrote (in <[email protected]>) about 'Stepping receiver, step sizes.', on Fri, 7 Dec 2001: >BTW, my 8571A system uses an 8566B SA, and that analyzer actually uses an >analog swept oscillator. But under software control, it will obey the >software requests to look only at the directed frequency with a view of only >the selected resolution bandwidth. In the above example, it would see 2949.5 >MHz to 2950.5 MHz (3 dB down points), then next see 2959.5 MHz to 2960.5 >MHz. Signals between 2950.5 MHz and 2959.5 MHz would be seen anywhere from 3 >dB too low to completely missed in the SA noise.
But that's a 1MHz bandwidth and a 10 MHz step. Not surprising that some frequencies are missed. A 1 MHz bandwidth and 1 MHz step, centred on integer MHz frequencies, would see a 2950.5 MHz signal in the '2950 MHz' step and in the '2951 MHz' step, both showing the signal at 3 dB down on its real level. -- 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.
