FCC Part 15 Radiated Emission (RE) Limits
FCC Section 15.109 – Radiated Limits
Quick reference for FCC Part 15 limits (Section 15.109 Radiated Emissions). View Class A (10m) and Class B (3m) digital device field strength limits in μV/m and dBµV/m.
Class B (3m distance)
Class A (10m distance)
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FCC Part 15 Radiated Emission Overview
FCC Part 15.109 specifies the radiated emission limits for unintentional radiators. These limits are designed to prevent electromagnetic interference with licensed communications services.
Measurement Distance: The limits for Class B devices are typically specified at a measuring distance of 3 meters. The limits for Class A devices are typically specified at a measuring distance of 10 meters. If measurements are made at a different distance, an extrapolation factor (typically 20 dB/decade) must be used. You can use our Distance Extrapolation Calculator for quick conversions.
Calculations: The standard specifies field strength in microvolts per meter (μV/m). For engineering convenience, this page also provides the values converted to decibel microvolts per meter (dBµV/m) using the formula: dBµV/m = 20 * log10(μV/m).