[Microwave] Building a noise source/head

[j.e.m.smeets@philips.com]

----- Forwarded by J.E.M. Smeets/EHV/COMP/PHILIPS on 2003-09-18 10:00 
-----







J.E.M. Smeets
2003-09-18 09:32


        To:     Scott Townley <nx7u@arrl.net>
        cc:     microwave@mailman.qth.net
microwave-admin@mailman.qth.net
vhf@w6yx.stanford.edu
wswss@mailman.qth.net
        Subject:        Re: [Microwave] Building a noise source/head
        Classification: Unclassified


hello microwavers !!

If some one has build a noisesource or bought a source via Ebay and has 
acces to a real noise figure meter like HP8970 or Ailtech on the QRL, how 
can the ENR of the homebrew noisesource  being measured if a professional 
noise source is availble ?

Is it possible to measure with a PANFi or spectrumanalyser  the on / off 
noise power of that source and compare it with the profesional source or 
is the only method to obtain the ENR table of the source at different 
frequency's to use a hot and cold standard with a large temperature 
difference and for each band the appropiate converter ?

I think the easiest way to obtain ENR is to compare  preamps at different 
frequency's  with the prof source and to play aropund with the ENR setting 
of the PANFI to get the same noisefigure as with the prof source ?

anyone has expierience with this kind of difficult questions ??

73 jac pe1kxh 


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