whether or not you caught it on you SA trace would be a function of your sweep rate relative to the signal, it's possible the interfering signal and the sweep of the SA never were at the same frequency at the same time. I would agree with the zero span approach recommended by Mr. Benner. It may be useful to know the bandwidth and adjacent channel rejection of the receiver that is interfered with, as the interference may not be right on the frequency. It is always possible that the signal was below the noise floor, but if it was big enough to jam your device it probably isn't, this assumes of course a reasonable antenna factor and cable loss. Clif
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Cortland Richmond Sent: Thursday, April 19, 2007 9:49 PM To: IEEE EMC Discussion Group Subject: RE: Interference with a 916 MHz link This suggests that the signal is below the SA noise floor. Cortland KA5S ----- Original Message ----- From: Derek Walton <mailto:[email protected]> To: Clif Brick <mailto:[email protected]> Cc: IEEE EMC Discussion Group <mailto:[email protected]> Sent: 4/19/2007 4:57:08 PM Subject: RE: Interference with a 916 MHz link Hi Clif, a SA was used to look at the band, left in peak hold mode for 5 mins... nothing showed upon the trace.... This is whats got us puzzled... Thanks, Derek. - ---------------------------------------------------------------- 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 ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ - ---------------------------------------------------------------- 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
