January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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360 UHF AND MICROWAVE RECEIVERS
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RECEIVER
Figure
18-9
Receiver input equivalent
circuit.
dBm.
These units refer to decibels relative to one milliwatt (1 roW) dissipated
in a 50-f~ resistive impedance (defined as the 0-dBm reference level), and are cal-
culated from 10 log (PwArrs/0.001) or 10 log
(PMw).
In the noise voltage case calcu-
lated above, 0.028 mV in 50 f~, the power is 1/2/50, or 5.6 x 10 -l~ W, which is 5.6 x
10 -7 mW. In dBm notation, this value is 10 log (5.6
x
10"7), or --62.5 dBm.
dBmV.
This unit is used in television receiver systems in which the system im-
pedance ...
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