Category Archives: Antenna Simulation

Modelling a 40m Dipole at Various Heights

Last time we looked at the performance of a 40m dipole at 7.5 m or 3/16 wavelengths high. We discovered that its DX potential was limited but the high angle radiation made it useful for NVIS service. Now we will look at the change of performance as we increase the height of the antenna up […] Continue reading

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Modeling a 40m Dipole at Low Height

Varying the height of an antenna above ground affects many of its characteristics, among which are its feed impedance, its gain, the angle above the horizon at which maximum gain occurs, and the length of the elements for resonance. We will model a 40m dipole and investigate its performance at 7.5m, 10m, 15m. 20m, 30m […] Continue reading

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New features in EZNEC Plus v5.0 Upgrade

I’ve just upgraded from EZNEC+ v4.0 to EZNEC+ v5.0. The new version offers a number of new features. To quote from W7EL Roy Lewallen’s email: “For the first time, you can get a program which analyzes a whole antenna system, from the antenna clear back to the transmitter! EZNEC v. 5.0 allows you to directly model […] Continue reading

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Modelling an Antenna with EZNEC

EZNEC is a powerful, low-cost, antenna modelling program for Windows developed Roy Lewallyn – W7EL. It is based on the powerful NEC-2 (which stands for Numerical Electromagnetics Code) software for modelling antennas and other electromagnetic structures using the Method of Moments. NEC was developed at Lawrence Livermore Laboratories. EZNEC is easy to use, and is particularly effective […] Continue reading

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