I've been practicing problems relating to the dB conversion and came across this interesting example problem.
In the above example Tx power is defined in Watts and the conversion from the Watts to dB is done. However, so far according to my understanding of the definition of dB, is defined in relative to receiver power too. But in the above example the calculation was done just by considering the Tx power.
Can some one enlighten me? If I'm understanding it wrong or the example is wrong?
Thanks in advance.