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DBW 10 MHZ bandwidth of the signal power to - 167, 50 MHZ DBW power for?

Time:10-11

DBW 10 MHZ bandwidth of the signal power to - 167, 50 MHZ DBW power for?
My idea is 50 MHZ is five times as many as 10 MHZ, when power into w as unit, the power of 50 MHZ shall be 10 MHZ 5 times the power (w) of d, converted to DBW, is 5, so I think DBW 50 MHZ signal power for - 162, but the inside of the calculation results for 160.01 DBW, I don't know if I where there is a problem, a great god guide, please
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