Don't be fooled by the negative sign, it doesn't result in a negative number, but rather a very small number. Here's how it works:
-40 decibel milliwatts
= -4 bel milliwatts
= (10 to the power of -4) milliwatts
= .0001 milliwatts
= 100 nanowatts
You can never get decibels to result in a negative number, never ever.
Going the other way, if you wanted to convert the power of the Alfa to dBm, it'd be:
500 milliwatts
= 2.69897 bel milliwatts (I got this figure by taking the Log10 of 500)
= 26.9897 decibel milliwatts
So it's about 27 dBm
Ask questions on the open forums, that way everybody benefits from the solution, and everybody can be corrected when they make mistakes. Don't send me private messages asking questions that should be asked on the open forums, I won't respond. I decline all "Friend Requests".
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