Signal Strength and Attenuation in Decibels
Explore the concept of measuring signal strength and attenuation using decibels. Learn about the unit of decibel, calculation formulas, signal amplification, and why engineers use decibels in signal measurements. Dive into examples and understand how decibel values can be added or subtracted to measure changes in signal strength across multiple points.
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Presentation Transcript
Measurement of Attenuation To show the loss or gain of energy the unit decibel is used. GdB= 10log10Pout/Pin Pin- input signal Pout- output signal 3.6
Signal Strength +ve or -ve
A signal travels through an amplifier, and its power is increased 10 times. This means that P2 = 10P1 . In this case, the amplification (gain of power) can be calculated as 3.8
Example 3.28 One reason that engineers use the decibel to measure the changes in the strength of a signal is that decibel numbers can be added (or subtracted) when we are measuring several points (cascading) instead of just two. In Figure a signal travels from point 1 to point 4. In this case, the decibel value can be calculated as 3.10
