And dBmv for CATV and other TV RF sources. Also the Reference Levels for Cable Modems.
0dBmv = 1mV across a 75 Ohm load.Confusing wording?
Feb 06, 2020
45 Replies
Here we go!
Mikek
Wow! The number of interpretations we've had over this! :-D
r minus 25%' is close enough.
Agreed. Here's a paragraph from the HP 654A Test Oscillator Manual, Section 1, General Information, Page 7:
The Model 654A is a stable, low distortion sine-wave signal source with a flat frequency response of +/-0.5% over the frequency range of 10Hz to 10 MHz. The attenuators allow the signal to be adjusted in 1 dB and 10 dB steps from +10 dBm to -89 dBm, and the front panel AMPLITUDE control allows a continuous adjustment in level of +/-1 dB from the settings shown on the OUTPUT LEVEL attenuators. The flat frequency response is achieved by automatic leveling circuits within the 654A.
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no, an increase of 1mw would be +(0dBm)
Jasen.
My bad, of course it's 0dBm.. (I was wondering why somebody thought
9dBm+1dB=9.6dBm, but that's it!)
mikko
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