Hi Charles, I have seen some other replies but I understood your question differently. Are you trying to test the receiver or is it simply a remote front end for your measurement set? I don't know anything significant about the first, but if it is the latter then the receive head should be place very close to the antenna but not so close that it intereferes with the antenna behavior. This is most commonly used at microwave frequencies where cable losses are high, the receive head is located behind the dish (or somewhere equivalnet) where is does not interact with the antenna and then the down feed is at an IF where cable losses are much lower. If this is what you have then the receiver does not have to be illuminated, though it can be, the main concern is that it does not affect the calibration of the antenna in any way. Last time I worried about this I was measuring radiation patterns from 40GHz systems close to 24 years ago. I haven't used this type of receiver for EMC work (yet!). cheers, Colin..
-----Original Message----- From: Grasso, Charles [mailto:charles.gra...@echostar.com] Sent: Tuesday, October 29, 2002 6:48 PM To: emc-p...@majordomo.ieee.org Subject: Question on Receiver EMI testing.. 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: charles.gra...@echostar.com; <mailto:charles.gra...@echostar.com; %20> Email Alternate: chasgra...@ieee.org