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Noise Figure is a metric for measuring the Signal to Noise Ratio degradation, when Noise Power generally is the total noise per bandwidth at specific frequency.
So, better than using a Noise Figure Analyzer is to use a standard Spectrum Analyzer and measure the noise power at particular frequencies in dBm.
If you want to measure the carrier noise power at specific offset in dBc/Hz use the following formula:
Noise power[dBc/Hz] = Carrier power[dBm] – Noise power@Freq offset[dBm] – 10*LOG(RBW[Hz])
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