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What does normalised site attenuation validate?

  • A.That the equipment under test meets the applicable emission limit
  • B.That the ground plane has sufficient conductivity for the measurement
  • C.That a test site behaves as an ideal site over its frequency range
  • D.That the receiving antenna has the gain stated on its certificate

Answer: C

Comparing the measured attenuation between two antennas with the theoretical value for an ideal site reveals reflections and other departures, and the site passes only if the difference stays within a few decibels. It validates the site rather than any antenna or product. Antenna calibration, product compliance and ground plane conductivity are checked separately. A procedure that tests the measurement environment before the product is a hallmark of a mature measurement discipline.

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