Signal Link
RF Unit Transformer
dBm
Watts
Volts
SYSTEM IMPEDANCE
Bidirectional Real-time Conversion
RF power is almost always measured on a logarithmic scale because signal strength can vary by many orders of magnitude.
dBm Reference: Remember that 0 dBm is exactly 1 milliwatt.
Impedance Matters: Notice how the Voltage changes when you switch from 50Ω to 75Ω. This is why you must always know your system impedance before measuring signal levels with an oscilloscope or spectrum analyzer.
The "Rule of 3s and 10s": * Adding 3 dB doubles the power.
- Adding 10 dB increases power by 10 times.