Receiver Sensitivity Explained: Why dBm to Microvolts (μV) Conversion Matters

When evaluating the performance of a radio receiver—whether it’s a modern SDR (Software Defined Radio), an amateur radio transceiver, or an FPV drone receiver—the most critical specification is its sensitivity. Sensitivity defines the weakest signal the radio can successfully pick up and demodulate. However, manufacturers often use different units: some specify absolute power in decibel-milliwatts (dBm), while others use voltage in microvolts (μV). This inconsistency can make comparing radios confusing.

In standard RF systems with a 50-ohm characteristic impedance, these two units are mathematically linked. A sensitivity of -117 dBm is precisely equal to 0.316 μV. Understanding this relationship helps engineers verify link budgets and evaluate noise floors accurately. If you ever find yourself struggling with a datasheet, you can use our built-in dBm to μV Voltage Converter to instantly translate absolute power into voltage for 50-ohm systems.