[SFDXA] dB or not dB? Everything you ever wanted to know about decibels but were afraid to ask

[William Marx]

Well looks to be a good article but couldn't get it to be linked properly. 
Bill W2CQ

> 
>> dB or not dB? Everything you ever wanted to know about decibels but were afraid to ask
>> Sponsored by: Rohde & Schwarz
>> 
>> INSHARE
>> 
>> 
>> 
>> COMMENTS 2
>> 
>> 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? Get a refresher on decibels by downloading this paper.
>> 
>> http://mwrf.com/analog-semiconductors/db-or-not-db-everything-you-ever-wanted-know-about-decibels-were-afraid-ask?utm_rid=CPG05000004678269&utm_campaign=6930&utm_medium=email&elq2=12831180402b4b4288972064d661ff2d