Amateur Extra › E4 Amateur Practices › E4D14
E4D14
What power level does a receiver minimum discernible signal of -100 dBm represent?
Pick an answer to check it.
Answer: D. 0.1 picowatts
0 dBm is 1 mW. -100 dBm is 100 dB (10^10 times) below that: 1 mW / 10^10 = 10^-13 W = 0.1 picowatts.
Tip: Every -10 dB divides by ten.