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The difference between dBm, dBm0, dBmP units

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taoly

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I am confused with these units. Who can help me to understand the meaming of them, or suggest some related documents. thanks a lot.
 

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.

https://www.sutron.com/products/reference/calcguides/eirp.htm is more information.
 

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