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Copyright: 1996 - 2024 Webmaster:
Kirt
Blattenberger,
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
AirplanesAndRockets.com
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mW-to-dBm / dBm-to-mW Power Conversion |
Power
is commonly expressed in decibel values in order to make adjustments due to loses and gains. The logarithmic
nature of decibel units translates the multiplication and division associated with gains and losses into addition
and subtraction. Once you get used to it, you will never want to return to watts. Units of dBm are decibels
relative to 1 mW of power, hence, 0 dBm 1 mW. 1/100 mW is -20 dBm and 100 mW is +20 dBm. Powers less than 1 mW are
always negative dBm values, and powers greater than 1 mW are always positive. See the graph below.
Here are the formulas: P(mW) = 10[P(dBm)/10] P(dBm)=10*log[P(mW)]

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