Keep in mind that the location of the pre-amp can make a big difference too. If
you are trying to make up for cable loss, the best place to put the pre-amp is
near the antenna, before the loss occurs. Some labs mount one of those small
amp-modules right on the antenna but you have to run DC power to it. We mount
our amp where the antenna coax meets the floor. We gain several db in the noise
floor over mounting it near the receiver.
Brian
____________________Reply Separator____________________
Subject: RE: Pre-amps
Author: marti...@appliedbiosystems.com
List-Post: emc-pstc@listserv.ieee.org
Date: 11/14/01 8:06 PM
John and all,
I am looking for a pre-amp to connect to our receiver/antenna for
performing radiated emissions testing from 30-1000MHz. It has been
recommended that the gain be approximately 20-22dB with low noise. I am
guessing that most people on this forum that have EMC labs use a similar
type pre-amp for their radiated emissions set up.
Please excuse me for not providing this information in my initial question.
As always, your responses are greatly appreciated.
Joe Martin
"John Shinn"
<john.shinn@sa To: <marti...@appliedbiosystems.com>,
<emc-p...@majordomo.ieee.org> nmina.com> cc:
Subject: RE: Pre-amps
11/14/01 01:03
PM
Please respond to
john.shinn
What is the frequency range needed. Is this Audio (10 Hz to 40 kHz)?
RF (0.1 MHz to 1000 MHz)? Above 1 GHz? What transducer is
feeding the input? Microphone, antenna, etc.? Output Z requirements?
Do you need a specific gain, such as between 20 to 22 dB? or can you
live with something greater such as 25 dB? Does it need to be adjustable?
That information would be helpful.
Regards,
John Shinn, P.E.
Manager, Lab Operations
Sanmina
-----Original Message-----
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of
marti...@appliedbiosystems.com
Sent: Wednesday, November 14, 2001 10:15 AM
To: emc-p...@majordomo.ieee.org
Subject: Pre-amps
I am having some difficulties locating manufacturers that provide preamps
with a 20-22dB gain.
What manufacturer/model do you recommend? Why?
Your assistance is appreciated.
Regards
Joe Martin
Applied Biosystems
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