Q: 1
The noise floor measures 000000001 milliwatts, and the receiver's signal strength is -65dBm. What is
the Signal to Noise Ratio?
Options
Discussion
Option D. Seen this in a few practice sets and SNR is just the difference between signal and noise dBm. Pretty sure that's the logic here.
Option D The trick here is not falling for B, SNR is signal minus noise in dBm.
C/D? Both look possible since noise floor vs signal strength can sometimes trip me up with units, but D feels right with the subtraction. Not totally sure, so open to other takes.
B or D? I'd say B because 0.000000001 milliwatts is -90 dBm, not -65 dBm, so difference to -65 dBm is 15 dBm. But if they're assuming the noise floor is already -90 and not 0, maybe that's where D comes from. Kinda fuzzy on which number they want for 'noise floor' here, anyone else read it that way?
Maybe D, had something like this in a mock and SNR was the difference.
Nah, not B here. The units trip people up but subtracting dBm values is the usual method for SNR. D.
D , matches what I've seen in practice and the numbers line up with most official guide explanations for SNR.
B is off, D fits since -65 minus -90 gives 25 dB for SNR.
I don’t think it’s D. B makes more sense, since the difference between -65 dBm and -80 dBm is 15 dBm if you treat the noise floor as -80. Maybe I’m missing something but the trap could be which decibel reference they want.
Honestly could go either way but leaning D here.
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