Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Manufacturers & Services Consultants Engineer Jobs Twitter LinkedIn Advertise on RF Cafe! Engineering Books Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar Day in History RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Bookstore Calculators Education Engineering Organizations Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings Advertisers Websites RF Cafe Archives Test Notes Slide Rules RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

RF Cafe Software

RF Cascade Worbook
 RF Cascade Workbook 2005 - RF Cafe
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel
RF & EE Symbols Word
RF Stencils for Visio

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeKirt Blattenberger
BSEE
KB3UON
EIEIO

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

no noise figure analyzer how to measure a new LNA NF? - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

-- Amateur Radio
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Systems
-- Test & Measurement

 Post subject: no noise figure analyzer how to measure a new LNA NF?
Posted: Tue Aug 21, 2007 10:19 am 
 
Lieutenant

Joined: Tue Aug 21, 2007 9:43 am
Posts: 3
Location: shanghai
I have design a ATF-54143 LNA
but have no noise figure analyzer
just a HP8563E Spectrum and a signal generator and vector analyzer
so I can measure S21 and S12 S11 and P1dB

BUT I can not measure NF of LNA .
Spectrum have so more error when connect with generator.

HOW can I measure a NF of LNA without noise figure analyzer

thank you .


 
   
 
 Post subject:
Posted: Tue Aug 21, 2007 9:50 pm 
 
Captain
User avatar

Joined: Sat Apr 22, 2006 11:14 pm
Posts: 20
You need a calibrated noise source to do a Y-Factor measurement. Agilent has a good app note at http://cp.literature.agilent.com/litweb ... -3706E.pdf

App Note 57-1 is also a good reference.

Dave


 
   
 
 Post subject:
Posted: Wed Aug 22, 2007 8:37 am 
 
Lieutenant

Joined: Tue Aug 21, 2007 9:43 am
Posts: 3
Location: shanghai
THANK you

I known these 3 ways to measue NF .

1 use noise figure analyzer ,(I have not)

2 use spectrum to calculate NF.GAIN measurement ( our company's spectrum have so many errors)

3 use Y-Factor measurement (I have not noise source).

oh, no way


 
   
 
 Post subject:
Posted: Thu Aug 23, 2007 9:54 pm 
 
Captain
User avatar

Joined: Sat Apr 22, 2006 11:14 pm
Posts: 20
The Noise figure meter simply automates the Y-factor measurement. You really need a noise source to do this. It's been a long time since I purchased a noise source, but google is your friend here. The Amateur radio community has build up noise sources from Noise diodes and Zener diodes, so you could probably DIY a noise source if you have to.

Dave
www.keystoneradio.com






Posted  11/12/2012

Try Using SEARCH to Find What You Need.  >10,000 Pages Indexed on RF Cafe !

Copyright 1996 - 2016
Webmaster:  Kirt Blattenberger, BSEE - KB3UON
Family Websites:  Airplanes and Rockets | Equine Kingdom

All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.