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1.2.3
1.2.3
Any practical measurement will be subject to some form of noise or unwanted signal (thermal noise or interfering signals). The noise floor limits the smallest measurement that can be taken with certainty since any measured amplitude cannot on average be less than the noise floor.

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                                           -173.977 dBm/Hz +60 dB/MHz +10*log10(5 MHz) + 9 dB= -98 dBm

 

Another example is that for a noise figure of 4 dB and a bandwidth of 200 kHz with thermal noise = kTB = -121 dBm, the noise floor is -117 dBm.

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