Question: In UTRA repeater conformance testing, when multiple power supply configurations are available, what determines if RF parameters need to be tested for each configuration?
Option 1: The type of power source (e.g., AC, DC, or solar)
Option 2: The number of power supply configurations exceeding three
Option 3: Whether the test range covers all conditions presented by any single power supply configuration
Option 4: The manufacturer's declaration of equivalence across all configurations
Explanation: This is correct because, according to the principle outlined, if it can be demonstrated that the testing range encompasses the variability introduced by any of the power supply options, then not all configurations need individual RF parameter testing. This approach ensures that the equipment's performance under various power conditions is adequately assessed without redundant testing.