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Technical Article - dB or not dB?

Date : 07 / 03 / 2011
Author : Rohde & Schwarz

Everything you ever wanted to know about decibels but were afraid to askā€¦
The article down loadable below from Rohde & Schwarz may be of interest to radio amateurs.

True or false: 30 dBm + 30 dBm = 60 dBm? Why does 1% work out to be -40 dB one time but then 0.1 dB
or 0.05 dB the next time? These questions sometimes leave even experienced engineers scratching their
heads. Decibels are found everywhere, including power levels, voltages, reflection coefficients, noise figures, field strengths and more. What is a decibel and how should we use it in our calculations? This Application Note is intended as a refresher on the subject of decibels.

Related Files

Rohde & Schwarz dB Application Notes
R&S dB APP Note.pdf

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