Oct 17, 2003 #1 T taoly Junior Member level 3 Joined Mar 5, 2003 Messages 31 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Activity points 138 I am confused with these units. Who can help me to understand the meaming of them, or suggest some related documents. thanks a lot.
I am confused with these units. Who can help me to understand the meaming of them, or suggest some related documents. thanks a lot.
Oct 17, 2003 #2 flatulent Advanced Member level 6 Joined Jul 19, 2002 Messages 4,624 Helped 489 Reputation 980 Reaction score 151 Trophy points 1,343 Location Middle Earth Activity points 46,689 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.
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.