Solve for i decibel scale4/16/2024 ![]() ![]() The scale can run negative as well, so a carrier transmitted at 0 dB is half the power of that 3 dB carrier, and at -3 is one-quarter the power. And a carrier transmitted at 9 dB is four times as powerful as that 3 dB carrier. A carrier transmitted at 6 dB is twice as powerful as a carrier transmitted at 3 dB. The handy rule of thumb of the decibel scale is this: 3 dB means twice the power. Since this is base 10, we can be express this without the explicit base: Where P1 and P2 are the two signals to be compared. ![]() A decibel is the base 10 logarithm of the ratio of the power of two signals, times 10: We know two of three variables P1, P2, and Y, and we want to solve for the missing one.įirst, the basics. How large can I make my new carrier P2? Or if Y is negative, how small? I have carrier P1 of a certain size, and Y dB margin (additional power available).How much additional power does he need to support the new carrier?” What is the difference in power (Y) between them? Commonly this question appears as “Customer has capacity P1 and wants P2. I want to focus on how this helps us answer a few important questions in carrier sizing. There are plenty of good places to understand decibels. In simple terms, they are a convenient way of using addition instead of multiplication. It is a logarithmic scale, so increasing numbers represent an exponentional increase in power. Decibels (dB) are a way of expressing the relative difference in signal strength between two sources. In the satellite world we frequently work with the decibel scale. ![]()
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