Question: In accordance with 3GPP electromagnetic compatibility (EMC) standards for Base Stations (BS), what is the specified amplitude modulation depth for the test signal in EMC testing, as per IEC guidelines?
Option 1: 50% by a sinusoidal audio signal of 500 Hz
Option 2: 80% by a sinusoidal audio signal of 1 kHz
Option 3: 90% by a triangular audio signal of 2 kHz
Option 4: 70% by a square wave audio signal of 750 Hz
Explanation: The correct answer, Option 2, specifies an amplitude modulation depth of 80% by a sinusoidal audio signal of 1 kHz, which aligns with the detailed requirements outlined in the EMC testing standards for Base Stations as per IEC 61000-4-6. This specific modulation setup is crucial for accurately assessing the electromagnetic compatibility of base station equipment, ensuring it can withstand common electromagnetic disturbances without malfunctioning.