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Receiver specifications usually mention a '12dB Sinad', SINAD meaning Signal over Interference, Noise And Distortion - 12dB of difference between DEMODULATED signal and other noises, gives comfortable readability. Other specs may use a 20dB SINAD, or specify a number of microvolts intead of -dBm, just to confuse! UHF receivers generally resolve signals as weak as -120dBm or less.
Sensitivity equivilances
(probably in this range for a 12dB SINAD or several dB higher for a 20dB SINAD)
dBm ---(50 Ohms)--- (75Ohm) dBW
-115 0.398uV -8dBuV 0.487uV 5dBf -1445
-116 0.354uV -9dBuV 0.434uV 4dBf -1446
-117 0.316uV -10dBuV 0.387uV 3dBf -1447
-118 0.282uV -11dBuV 0.345uV 2dBf -1448
-119 0.25uV -12dBuV 0.306uV 1dBf -1449
-120 0.223uV -13dBuV 0.273uV 0dBf -1550 (femtowatt)
-121 0.2uV -14dBuV 0.245uV -1dBf -1551
-122 0.178uV -15dBuV 0.218uV -2dBf -1552
-123 0.158uV -16dBuV 0.194uV -3dBf -1553
-124 0.141uV -17dBuV 0.173uV -4dBf -1554
-125 0.126uV -18dBuV 0.154uV -5dBf -1555
-126 0.112uV -19dBuV 0.137uV -6dBf -1556
ajhsu said:so "12dB SINAD 0.158uV (SINAD 12dB) "
means RF input level >=0.158uV , output can get 12dB SINAD.
Is that right ? Thanks.