?
Solved

DB calculation

Posted on 2007-11-21
3
Medium Priority
?
651 Views
Last Modified: 2008-02-01
can someone please explain this question and give me the answer:

A receiver has a noise factor of 10db and it is proposed to improve its sensitivity by adding a preamplifier of 3db noise factor and a 10db power gain. To what extent will the receiver performance improve if the effective noise temperature of the receiver aerial is:
(1) 290k
(2)58K
0
Comment
Question by:andrewwismith
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 27

Expert Comment

by:d-glitch
ID: 20329234
You are asking for a lot help with a homework question.
You can't get answers, but you may be able to get some help.

For a start:  What are the relevent equations?
0
 
LVL 27

Accepted Solution

by:
aburr earned 1500 total points
ID: 20329987
“explain this question”

A receiver has a noise factor of 10db and it is proposed to improve its sensitivity by adding a preamplifier of 3db noise factor and a 10db power gain. To what extent will the receiver performance improve if the effective noise temperature of the receiver aerial is:
(1) 290k
(2)58K

There is no reason to add a preamplifier to a receiving system if the preamp picks up just as much noise from the antenna as the receiver.
To do this problem you have to know what is a “noise factor” and what is meant by “effective noise temperature”.
0
 

Author Comment

by:andrewwismith
ID: 20333681
noise factor was 290K
0

Featured Post

Need protection from advanced malware attacks?

Look no further than WatchGuard's Total Security Suite, providing defense in depth against today's most headlining attacks like Petya 2.0 and WannaCry. Keep your organization out of the news with protection from known and unknown threats.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Originally published Entrepreneur.com Booming numbers of freelancing professionals are changing the face of work. In the United States alone last year, the number of workers freelancing grew from 700,000 to 54 million, according to a Freelancers’…
Gift cards are not a new concept - it's been around for a very long time.  Undoubtedly, over the past you have received such a card or purchased one for a friend or relative.  Are you aware that you've been feeding the machine?  If not, read on :)
This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
Suggested Courses

765 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question