Why is measuring only the 8-VSB pilot frequency an inaccurate representation of average power?

Measuring only the 8-VSB pilot frequency can indeed lead to inaccuracies in representing average power due to potential errors that may distort the pilot signal relationship. The pilot signal is intended to assist in demodulation and provide a reference for timing and control in the transmission system. However, if there are any errors in the measurement process or distortion present in the signal, it can result in a misleading assessment of the overall quality and power of the transmitted signal.

The pilot frequency is just one component of a broader signal that includes various data and information being transmitted. Relying solely on this specific frequency might overlook the contributions from other parts of the signal that are crucial for a complete understanding of the average power being conveyed. Thus, the measurement based solely on the pilot frequency could fail to capture the full spectrum of the transmission, leading to an inadequate representation.