17th October 2003, 04:06 #1
Member level 1
The difference between dBm, dBm0, dBmP units
I am confused with these units. Who can help me to understand the meaming of them, or suggest some related documents. thanks a lot.
17th October 2003, 04:06
17th October 2003, 05:02 #2
Advanced Member level 5
db dbm dbm0
dBm is power measured in milliwatts and expressed in dB above or below one mW.
dBm0 is almost similar except it is power relative to a zero level that is different from 1 mW.
dBmP is relative to Picowatts of noise psophometrically weighted (pWp)
These terms come from copper wire telephone systems and go back 100+ years in some cases.
http://www.sutron.com/products/refer...uides/eirp.htm is more information.