VE3SQB ANTENNA DESIGN PROGRAMS EN82NE
Over the last two decades, computerized antenna modeling has advanced greatly. Modeling, a powerful tool in Amateur Radio, can help you to design antennas and optimize their performances.Advanced Antenna Modeling is in every respect the guide to using modeling software for designing, optimizing and evaluating antennas. 4nec2 is a completely free Nec2, Nec4 and windows based tool for creating, viewing, optimizing and checking 2D and 3D style antenna geometry structures and generate, display and/or compare near/far-field radiation patterns for both the starting and experienced antenna modeler.
Hams go where no engineer has gone before.
FOR THE EXPERIMENTER
The second antenna is even simpler, consisting of only two bowed elements. While not as good as the first , it still shows promise and anybody could build it. Although originally designed for 137.5 wefax reception, circular polarized antennas can make nice standby omni antennas to monitor band openings, both horizontal base, vertical mobile communications or even for a beacon xmitter.
The omniquad (V2 corrected) is a very simple but excellent standby vertical antenna. I've built many over the years but just got around to making up a program. The main advantage is the extreme bandwidth. Make all the dimensional errors you want, and it will still work. You can use wire or tubing. A broom handle ,some 1/4 dowels and under 10 feet of wire will make a 2 meter antenna. There is very little gain or pattern difference between the 3 and 4 sided versions but the 4 sided version does give a better match. It can even be used as a desk top antenna.The log periodic antenna is the ultimate broadband beam. It can provide high gain on a single band or moderate gain on multiple bands. On vhf you can easily design a single feed 2 and 6 meter antenna. On hf the size and element diameters are usually a drawback .Wire versions are usually the answer. Although 4 bands is usually stretching it, don't be afraid to try more. I had an inverted 'T' loaded 13 element designed for 160 to 6 meters and it worked. It covered an acre ,was 120 feet wide ( 40 meters), 350 feet long (105 meters) and was suspended from 3 towers. The 1/2 mile of wire looked like a suspension bridge. The neighbours are still cautious to talk to me and the XYL doesn't want to discuss it.
Put your qth on the map............Elmer---..Got antenna questions? Put it on the forum or or e-mail me. To reduce spam directed from this site, please put the word 'antenna' in the e-mail subject area. All other e-mail without this is deleted un-opened. No subject, no reply!
Nothing to do with radio but another hobby. A program to figure out dKh/Ph/Co2 and how to make dKh reference solutions for aquariums
Look up your family tartan or design your own
Especially designed for antenna modelers, 4nec2 is a simple tool for designing, optimizing and verifying 2D or 3D geometry structures.
4nec2 is easy to use and comes with a basic 3D editor to help novices create antenna models, compare field patterns, generate SWR charts and learn in the process. However, it also features options designed to meet the requirements of more advanced users, such as the genetic algorithm based optimizers.
The interface looks rather crowded, but it provides fast access to all the options. It displays detailed information about the antenna parameters, such as the voltage, frequency, wavelength, impedance, the number of series and parallel components, input power, structure and network loss and the calculated efficiency.
The geometry editor provides real-time rendering of the model, displaying a 3D graphical representation of the model and enabling you to rotate it freely, zoom in and out, determine segment lengths or view the wire load.
Auto-segmentation, frequency sweeps. step-radius conversion, adjustable input power, memory usage options, customizable unit types are other features that this application comes with. Additionally, it can calculate area-plot and point plot data and display it on the screen.
The built-in geometry builder enables you to set the configuration parameters (radius, angles, rotation, length etc.) in order to generate patches, boxes, cylinders, parabolas, helices or spheres. The application can evaluate the model and optimize the antenna and other variables, such as the resonance, efficiency, SWR or the F/B and F/R-ratios.
4nec2 is capable of running up to 11000 wires and/or segments and features a powerful real-time 3D geometry and pattern viewer. It is suitable for both experienced and beginner antenna modelers, providing all the necessary tools for designing fully-functional designs.
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