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Basic NEC with Broadcast Applications by J.L. Smith

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4.1 The Coordinate System

An antenna array is described to NEC-2 as a series of straight wires whose locations are specified in terms of their end coordinates. To specify the end coordinates, NEC-2 uses the conventional spherical coordinate system commonly used in mathematics, as sketched in Figure 4-1.

Azimuth displacement (Φ) in the X-Y plane is measured from the +X-axis and increases in the counterclockwise direction. The elevation angle (Θ) is measured from the +Z-axis with the zenith being 0°.

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FIGURE 4-1Conventional spherical coordinate ...

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