By J.L. Smith
Uncomplicated NEC with Broadcast functions addresses computing device modeling of MF directional broadcast antennas and illustrates the resources and liabilities of the Numerical Electromagnetic Code (NEC). The book's "how to" strategy unearths the basics of NEC operation, teaches broadcast purposes and exhibits the reader tips on how to use NEC-2 to: version non-radiating networks, determine calculations, detune unused towers, layout top-loaded and skirted antennas, reduce coding by way of relocating and duplicating buildings, and masses extra! entire with CD, the ebook is a useful toolkit with software program worthwhile for the layout and research of broadcast antenna arrays. *Learn to exploit the tactic of moments laptop courses to layout and research MF directional antennas *CD contains a converted model of NEC-2, courses for geometry viewing and development plotting, in addition to author-written publish processing courses to transform goal box ratios to base force voltages and to ensure the integrity of the NEC-2 research *Concepts taught during this booklet observe to research generated via NEC-2, NEC-4, MININEC and different approach to moments desktop courses
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Extra resources for Basic NEC with Broadcast Applications
9 Radiation Pattern The listings under - RADIATION PATTERNS - in Output 2-8 show the vertical angle, theta, at which the pattern is calculated versus the azimuth angle, phi. 00 - POWER GAINS VERT. HOR. 13 ***** DATA CARD NO. 00E+00 ***** DATA CARD NO. 000 measured from the zenith overhead as 0Њ, making the horizon 90Њ. Thus a horizontal pattern is calculated with a value of theta ϭ 90Њ, not 0Њ. The ﬁeld shown as E(THETA) is the vertically polarized component of radiation and E(PHI) is the horizontally polarized component.
41 42 CHAPTER 4 Array Geometry The broadcaster, on the other hand, identiﬁes points in the geographical coordinate system by employing the compass heading and the distance from a given reference point. The compass heading, designated phi (Φ), is measured from true north and increases in the clockwise direction. The broadcaster measures the elevation angle, theta (Θ), referenced to the horizon with the zenith being taken as 90Њ. It is plain that the two coordinate systems differ, so those of us who use NEC-2 for broadcast work have to reconcile these differences by deﬁning a coordinate system that is convenient for the broadcaster to use and is also acceptable to NEC-2.
The X coordinate and the Z coordinate are speciﬁed the same by both NEC-2 and the broadcaster, so no change is required in specifying those two coordinates. The elevation angles differ only in deﬁnition. NEC-2 deﬁnes the zenith as 0Њ and the broadcaster’s convention is to deﬁne the horizon as 0Њ. The simplest reconciliation here is for the broadcaster to accept the NEC-2 deﬁnition. If a horizontal pattern is desired, just make the NEC-2 calculation at 90Њ instead of 0Њ, and so on. That is not difﬁcult and is the convention followed in the remainder of this book.