- dB problems

In this problem, some of the techniques you have learned in the last few problems will be used to solve problems.

1. Power drops from 10 W to 20 mW when an attenuator is switched on. What is the gain of the attenuator?
2. A signal with power 14 mW is put through an amplifier with gain 23 dB. What is the output of the amplifier?
3. A radar has a gain of 98 dB through its entire receive chain. If a signal at the receive chain input (the antenna) has a power of 5.2·10^-9 mW, what is the power at the output of the receive chain?
4. One radar has an average power of 1.3 kW. A second radar has an average power of 2 kW. How many dB more power does the 2 kW power represent?
5. If two signals are fed into identical resistors, with the first signal voltage at 3.9 volts and the second signal voltage at 2.53 volts, what is the dB difference between the two?
6. What is the formula for dB as a function of voltage, assuming the signals being compared go into the same resistances?