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The stuff you posted in your latest post is still all related to detecting CONTINUOUS WAVE signals.


Noise is not a continuous wave signal! It is random in nature :)



Sorry if you couldn't find the text I quoted. I posted up a link to a more modern version of application note AN-150 in error.


I intended you to look at your own linked AN-150 document here from 1974:


http://cp.literature.agilent.com/litweb/pdf/5952-1147.pdf



look at page 10 in the noise measuring section. and you will find the text I quoted earlier.


This is an earlier version of AN-150. it's the one you linked to yourself so I assumed you actually read it yourself before linking it on here ;)


HP/Agilent release newer versions of this AN-150 document every so often and I'm much more familiar with the modern versions as I have access to the very latest Agilent spectrum analysers (eg PSA and PXA) at my place of work.