Question: In a Base Station (BS) conformance testing for WCDMA, with a rated total output power in the operating band, what is the maximum allowed power level of a WCDMA interfering signal within the frequency range relevant for the transmit intermodulation test?
Option 1: 10 dB below the rated total output power
Option 2: 20 dB below the rated total output power
Option 3: 30 dB below the rated total output power
Option 4: 40 dB below the rated total output power
Explanation: The correct answer is based on the requirement that, in the presence of a WCDMA interfering signal, the transmit intermodulation level shall not exceed specific emission requirements. This scenario specifically mentions that the WCDMA interfering signal's power level should be **30 dB below the rated total output power** in the operating band to ensure compliance with out of band emission or spurious emission requirements during the test. This condition is crucial for assessing the Base Station's ability to manage interference without compromising its transmission quality.