What does the SNR actually mean? – again.

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What does the SNR actually mean? – again.

Not having found a description of the actual process of defining the SNR value, my hypothesis has been that the noise is measured in a 6 Hz wide channel with lowest signal strength i.e. only noise. The noise level is then multiplied with a factor to get the equivalent 2.5 kHz noise. It is then compared to the received signal to get the published SNR.
Is this close to the truth? I’ve experienced strange behaviour of the SNR value that doesn’t seem to agree with the above idea. Where am I wrong?