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Calculation of C/N accratly

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kspalla

kspalla

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To measure the system noise figure the ratio of C/N measurement at output ans input are necessary. How to calculate the C/N at the output in a receiver after / before demodulation?
Please suggest any alternative methods to find the NF accurately.
I am interested to measure the system NF of around 1.5dB to 2dB hence my measuring method should be accurate.
 

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