Question: In the context of Base Station (BS) conformance testing for FDD, what is the primary purpose of measuring Adjacent Channel Selectivity (ACS)?
Option 1: To evaluate the transmitter's ability to minimize out-of-band emissions.
Option 2: To assess the receiver's capability to filter out adjacent channel interference while receiving a wanted signal.
Option 3: To determine the maximum allowable power for an adjacent channel signal.
Option 4: To test the base station's handover performance between different frequencies.
Explanation: Adjacent Channel Selectivity (ACS) is crucial in evaluating how well a receiver can distinguish and protect the wanted signal from interference caused by signals in adjacent channels. This is particularly important in wireless communications to ensure quality of service and prevent cross-channel interference. By measuring ACS, one can understand the receiver's filtering capabilities in the presence of nearby channel activity, making Option 2 the correct answer as it directly addresses the primary purpose of ACS measurement as described.