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Extra info for ANSI C63.4 - (Revision of ANSI C63.4)

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The first reading of VR is with the two coaxial cables disconnected from the two antennas and connected to each other via an adapter. The second reading of VR is taken with the coaxial cables reconnected to their respective antennas and the maximum signal measured with the receive antenna scanned in height (Heirman [B17]). For both of these measurements, the signal source VI, is kept constant. The first reading of VR is called VDirect, and the second is VSite. These are used in the following Equation (1) for the measured NSA, AN: A N = V Direct – V Site – AF T – AF R – ∆AF TOT (1) where AFT = Antenna factor of transmitting antenna (dB/m), AFR = Antenna factor of receiving antenna (dB/m), AFTOT = Mutual impedance correction factor (dB).

Accurate antenna factors are necessary in determining the measured NSA. In general, antenna factors provided with the antenna are inadequate unless they were specifically or individually measured and the calibration is traceable to a national standard. Linearly polarized antennas are required. 5-1998 contain a design of a reference antenna and methods for calibrating antennas. 3) should be spot-checked against a known calibrated antenna. Antenna factors usually account for losses from the balun.

When mounting bases do not have bonding straps, bonding straps shall not be used in the test arrangement. 9 Temperature and humidity The ambient air temperature of the test site shall be within the range of 10 to 40 °C (50 to 104 °F) unless the EUT requirements specify testing over a different temperature range. The EUT and the measuring equipment shall be operated until temperature stable before the testing proceeds. The warm-up time shall be included along with the measurement results if the ambient conditions are outside of the range stated above, and evidence shall be given that the measuring equipment is accurate at the temperatures used.

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