Question: In a Base Station (BS) setup, under which condition is the OTA (Over-The-Air) transmitter intermodulation requirement **not** applicable?
Option 1: When the transmitter is in its transient period.
Option 2: For all BS types operating in the FR1 frequency range.
Option 3: During the transmitter OFF period.
Option 4: Specifically for BS type 2-O, regardless of operational state.
Explanation: The OTA transmitter intermodulation requirement assesses a transmitter's ability to minimize unwanted signal generation due to non-linear elements interacting with wanted and interfering signals. This requirement is crucial for maintaining signal integrity in co-located base station setups. However, as per the specifications, this particular requirement is explicitly exempted for Base Station type 2-O, making it the correct answer. This exemption suggests that either the design of BS type 2-O inherently mitigates intermodulation issues to an acceptable level or such concerns are addressed through other regulatory or technical means specific to this type.