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:[email protected]]
Sent: Tuesday, October 29, 2002 6:48 PM
To: [email protected]
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: [email protected];
<mailto:[email protected]; %20>
Email Alternate: [email protected]
