Satcoms UK Homepage

English Translation Italian Translation Spanish Translation French Translation German Translation Portugese Translation   
Russian Translation Arabic Translation Japanese Translation Hindi Translation Chinese Translation Hebrew Translation   
            Website Translations
 Home Tutorials Articles VSAT Forum Satcoms Forum Guest Forum CV Directory Job Vacancies
Teleports Industry News Updates Events Tools Link Budget Videos Satellite Shop VSAT Sales
Forum Home Forum Home - Ask the Experts - Satellite Communications Forums - General Satcoms Forum
  New Posts New Posts RSS Feed - how to calculete the noise figure
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


how to calculete the noise figure
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
esampathj View Drop Down
Member
Member


Joined: 02/December/2006
Location: Sri Lanka
Status: Offline
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote esampathj Quote  Post ReplyReply Direct Link To This Post Topic: how to calculete the noise figure
    Posted: 02/December/2006 at 02:30
how to calculate the cascade system noise figure.

the gain and noise figure of three amplifiers are given in table below.

amplifier A , gain = 6dB, noise figure = 2dB
amplifier B , gain = 10dB, noise igure = 4dB
amplifier C , gain = 8dB , noise figure = 3.5dB

calculate the overall noise figur when the amplifiers are cascaded in the order A, B , C

State the order of the amplifiers that would give the minimum averall noise figure.

calculate the overall noise figure that whould be abtained on B)


You are doing a great help for me. bcoz i dont have anyone to ask this question.
thx.
Back to Top
Sponsored Links


Back to Top
svstelekom View Drop Down
Expert
Expert


Joined: 28/November/2006
Location: Turkey
Status: Offline
Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote svstelekom Quote  Post ReplyReply Direct Link To This Post Posted: 03/December/2006 at 20:45
Note that when calculating cascaded noise figure, quantities must be expressed as ratios, NOT as decibels. By convention, lower case variables represent ratios, while upper case variables represent decibels (dB).         Conversions:   nf = 10NF/10   Û   NF (dB) = 10 * log10 (nf)

In Compact Form:
nfN = Cascaded noise figure equation formula, where N = number of stages

In Expanded Form:
Back to Top
svstelekom View Drop Down
Expert
Expert


Joined: 28/November/2006
Location: Turkey
Status: Offline
Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote svstelekom Quote  Post ReplyReply Direct Link To This Post Posted: 03/December/2006 at 20:48
http://www.minicircuits.com/pages/mcl_nf_calc.html
Back to Top
esampathj View Drop Down
Member
Member


Joined: 02/December/2006
Location: Sri Lanka
Status: Offline
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote esampathj Quote  Post ReplyReply Direct Link To This Post Posted: 05/December/2006 at 11:15
thx guys.
thx lot.
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down



This page was generated in 0.188 seconds.

 SUPPORTED PARTNERS & CHARITIES
ISR is the lynchpin of modern warfare and the methodology by which it is collected, analysed and disseminated continues to develop as forces encounter new and familiar challenges across air, land and sea in the 21st century. Both the cyber and space domains have seen and continue to see an incremental increase in offensive and defensive activity over recent years and, in these two domains, ISR finds itself yet more relevant. SMi are pleased to announce the 2nd instalment of MilSatCom Asia taking place on the 9th and 10th May 2012 in Singapore. With satellite communications increasing in the region this event will allow fantastic networking opportunities with senior SATCOM professionals from across the region and internationally. The reliance on satellite communication is increasing in Asia, and this event will attract senior SATCOM professionals from across the Asia-Pacific region to one place. Following in the footsteps of our flagship event and Europe’s largest military satellite conference and exhibition, Global MilSatCom. MilSatCom Asia will be a highly regarded niche conference to the Asia-Pacific region. Don't miss the opportunity to attend such an event and discuss the issues affecting the SATCOM community across the region.

RF Circuit & System Design 2 - 6 July 2012 The course has been specifically designed to cover the major elements relevant to engineers working or starting out in the RF field and should provide them with the expertise required to excel in this, their chosen field. By joining some of the foremost experts in the field of RF engineering delegates will quickly be given the tools to get to grips with the major aspects of RF Circuit & System Design.
 
Q-par Angus designs & manufactures antennas, positioners, components and complete systems across the radio frequency spectrum. We specialise in microwave & millimetric systems. Uplink Services Ltd Tewkesbury Satcom Consultants Myeloma UK provides information and support to all those affected by myeloma and aims to improve treatment and care through research, education and raising awareness. Macmillan Cancer Support improves the lives of people affected by cancer. We provice practical, medical and financial support and push for better cancer care. Cancer affects us all. We can all help. We are Macmillan.
 
 Home Tutorials Articles VSAT Forum Satcoms Forum Guest Forum CV Directory Job Vacancies
Teleports Industry News Updates Events Tools Link Budget Videos Satellite Shop VSAT Sales
Satcoms UK - Satellite Communications Community Website
© Satcoms UK 2002 - 2012 , All rights reserved.
Privacy Policy | Terms of Use