Adding a bit to Ken's comments. I agree, but I have seen many times when surprise emissions have been created by equipment that was never "supposed" to do that. Even a simple receiver can have a spurious problem, and I have encountered complicated receivers where T/R switches or electronic clamping circuits have created noise of their own (and very far out-of-band).
I would need a good reason to NOT exercise the receiver. Regards, Ed Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military & Avionics EMC Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis -----Original Message----- From: Ken Javor [mailto:[email protected]] Sent: Tuesday, October 29, 2002 5:36 PM To: Grasso, Charles; [email protected] Subject: Re: Question on Receiver EMI testing.. I'm not going to claim to be an expert on this one, but this is my two cent's worth. From the point of view of what rf might leak from the EUT, it seems that an LO or IF would be the main concerns. I don't see how the absence/presence of a receivable signal would affect LO emissions. The amplitude of the IF signal would be proportional to received signal strength, so if the IF were in the band controlled by your emissions limit, that might be important. ---------- From: "Grasso, Charles" <[email protected]> To: [email protected] Subject: Question on Receiver EMI testing.. List-Post: [email protected] Date: Tue, Oct 29, 2002, 5:47 PM Group, A hypothetical question for you... Should a receiver mounted on an antenna be "lit up" during an emissions test? The receiver down-converts the received signal?? Thanking you all in advance.. Best Regards Charles Grasso Senior Compliance Engineer Echostar Communications Corp. Tel: 303-706-5467 Fax: 303-799-6222 Cell: 303-204-2974 Email: [email protected]; <mailto:[email protected]; %20> Email Alternate: [email protected] <mailto:[email protected]> ------------------------------------------- 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] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
