Transmitter A has a power level of 1 mW, and transmitter B is 100 mW. Compare transmitter B to A using dB, and then identify the correct answer from the following choices.
- 0 dB
- 1 dB
- 10 dB
- 20 dB
- 100 dB
Explanation: Start with transmitter A’s level of 1 mW and try to figure out some simple operations that can be used to get to transmitter B’s level of 100 mW. Remember the handy dB facts, which use multiplication by 2 and 10. In this case, 1 mW × 10 = 10mW × 10 = 100 mW. Each multiplication by 10 adds 10 dB, so the end result is 10 + 10 = 20 dB. Notice that transmitter B is being compared to A (the reference level), which is 1 mW. You could also state the end result in dB-milliwatt (dBm).
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