"Caveat Lector" wrote
dB is a ratio for example dB = 10 log10 (P1/P2)
....snip...
In the equation above P2 is always one milliwatt
___________________

To elaborate, P2 above must be 1 mW only if one wants to calculate dBm.

The equation as it is written above will calculate the relationship in
decibels between any two power values expressed in the same units. For
example, to find the gain of an amplifier in decibels when its input power
is 50 watts and its output power is 1.2 kW:

dB = 10*log(1200/50) = 10*log(24) = 10*1.38 = 13.8

RF

Thanks for the clarification

I meant to say "For dbm In the equation above P2 is always one milliwatt"

Thanks

--
Caveat Lector (Reader Beware)



"Richard Fry" wrote in message
...
"Caveat Lector" wrote
dB is a ratio for example dB = 10 log10 (P1/P2)
...snip...
In the equation above P2 is always one milliwatt
___________________

To elaborate, P2 above must be 1 mW only if one wants to calculate dBm.

The equation as it is written above will calculate the relationship in
decibels between any two power values expressed in the same units. For
example, to find the gain of an amplifier in decibels when its input power
is 50 watts and its output power is 1.2 kW:

dB = 10*log(1200/50) = 10*log(24) = 10*1.38 = 13.8

RF