Question: In conformance testing for User Equipment (UE) / Mobile Station (MS) Over The Air (OTA) antenna performance, what is the primary reason for uncertainty when using different types of phantoms in laboratories?
Option 1: Variations in Radio Frequency (RF) signal strength across laboratories.
Option 2: Differences in environmental conditions (e.g., temperature, humidity).
Option 3: Utilization of non-standard phantoms, deviating from the specified standard phantom.
Option 4: Inconsistent placement of the UE/MS on the phantom during testing.
Explanation: The correct answer is Option 3 because the uncertainty primarily stems from laboratories using phantoms that differ from the standard, leading to variations in test results. This highlights the importance of standardization for ensuring consistent and reliable outcomes.