radio-frequency-susceptibilitylisted

# DO-160 Radio Frequency Susceptibility (avionics/do160/radio-frequency-susceptibility) Use when the task is RF immunity testing of airborne equipment per DO-160 section 20: computing radiated field strength from the amplifier and antenna setup, sizing the amplifier power budget with cable loss and calibration margin, converting between the dB units of the test levels, and judging conducted immunity margins against the CS114 category current limits. ## Domain quick reference - DO-160 section 20 (RTCA, EUROCAE twin ED-14G) covers radio frequency susceptibility: radiated immunity (RS101 magnetic field, RS103 radiated field) and conducted immunity (CS101 audio frequency on power leads, CS114 bulk cable injection, CS115/CS116 transients). Section 21 covers the companion emission tests (RE102 radiated, CE102 conducted). - Far-field relation: E = sqrt(30 * P * G) / d, with E in V/m, P the radiated power in W, G the linear antenna gain, and d the distance in m. Inverting gives P = E^2 * d^2 / (30 * G), the power needed to produce a required field level. - dB conventions: field level in dBuV/m is 20 * log10(E / 1e-6), with 120 dBuV/m equal to 1 V/m; current in dBuA is 20 * log10(I / 1e-6), with 120 dBuA equal to 1 A; power in dBm is 10 * log10(P / 1e-3), with 30 dBm equal to 1 W. - Power flux density: the plane-wave flux S = E^2 / 377 W/m2, with 377 ohm the free-space impedance; E = sqrt(S * 377). - Amplitude modulation: the RS103 modulated field peaks at E