There is a newer engine, nec4, which can directly handle some problems that nec2 cant, but its very expensive to buy the license from the government and very few hams have it or need it. You will notice that 4nec2 will start a new antenna project. But you are doing better than just following the rule. Can confirm that and what is the alternative to calculate the circular axial ratio of antennas with 4nec2. Df9cy eznec simulation files collection antenna modeling files for eznec and 4nec2. A model that took 60 seconds to run in 4nec2 s existing computation engine should complete under 25 seconds using the nec2mp engine in a dual core cpu and under 12 seconds in a quad core cpu. They both use the same underlying nec2 engine for modeling. The original nec2c is a noninteractive commandline application that reads standard nec2 input files and produces an output file with data requested by commands in the input file. But for very specific applications there are always good and bad experiences. The numerical electromagnetics code, or nec, is a popular antenna modeling system for wire and surface antennas. I would especially like to thank all the contributors english.
One disadvantage, however, is that not all types of programs are written for the mac. I havent been able to find anything like these programs that runs on mac, so you may have to run mach3 or emc in windows using boot camp or a virtual machine such as vmware or parallels. With the proliferation of personal computers and affordable even free software, antenna modeling has become a popular amateur activity. All you need to connect two such computers is an ethernet cable, which is inexpensive. With two devices connected via an ethernet cable, you can create a local network that lets you transfer files.
I like using mac computers because of the inherent stability of the underlying. Ray andersons unofficalnec archives contains linux, mac and unix. Nec2 is a public domain methodofmoments mom simulator suitable mainly for wire antennas and some planar antennas which do not rely on dielectric structures so no patch antenna simulations generally in nec2, 10 segments per wavelength is good, so 12 or segments depending on where you want your feed. Cst is the most complete software in terms of both frequency domain and time domain solvers. The program can be used to model an antenna, and then determine through simulation properties such as the radiation pattern and swr of the modelled antenna. View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. A quick look at some of the features of the antenna modeling program cocoa nec 2. To save space on your mac, you can move your imovie library to an external hard drive. From some comments by the creator of nec2mp, im beginning to suspect that it is easier to rewrite nec2 than to use it as a base. Cocoanec free nec software for the mac osx tiger operating system by w7ay. How to produce a nec antenna file and what software to. Below some 4nec2 specific tutorials i found on the internet or were sent by email. Sometimes a quick press of the keys is faster than pointing and clicking.
How to create a local network to connect two macs dummies. Imagine a simple 5 wire 2m ground plane antenna in freespace where the four resonant radials are horizontal. Antenna modeling software for the mac i like using mac computers because of the inherent stability of the underlying unix operating system, and the immunity to most viruses. When running frequency sweeps, linear or logarithmic style swr, gain, fbratio and impedance linecharts are produced.
Several other items, such as currents and wire numbers, can be. Go to the finder and press commandk or select go connect to server. Project is an operating system kernel 2 project is os distributionspecific 1 other operating systems 24 apple mac os classic 3 microsoft windows server 2003 1 handheldembedded operating systems 14 apple iphone 1 emulation and api compatibility 12 category category. What is the best software used for antenna design and. I use the 4nec2 to simulate my antennas but i think that 4nec2 can calculate correctly the axial ratio of antennas. Now i have also used 4nec2 and although 4nec2 has some really lovely features in terms of graphical output it is a little bit more tricky to get a beginner to be able to use it correctly than eznec, although i do like 4nec2. Navigating your mac is easy with gestures for your trackpad, force touch trackpad, and mouse. The downloaded program includes a reference manual and tutorial. Make your mac do amazing things with a swipe, a tap, and a click. However 4nec2 has an optimization routine builtin if you will be designing complex antennas.
I have been modeling antennas for several years, using eznec and 4nec2. However once you would like to advance beyond the basics, there really isnt any help around. Communications 428 ham radio 428 aol instant messenger 2. The original nec2c is a noninteractive commandline application that reads standard nec2 input files and produces an output file with data requested by. It was originally written in fortran in the 1970s by gerald burke and andrew poggio of the lawrence livermore national laboratory.
All recent macs have an ethernet port, as do many pcs and many printers and other devices, including the apple tv. Mmana free software based on mininec from dl2kqeu1tt. The w8io wb0dgf antenna site antenna modeling links. Details on how to construct this antenna, both as standalone and as. All the softwares that i found were not compatible with os x. Nec antenna simulation the numerical electromagnetics. Radiation pattern shown is typical figure8 pattern. A message will pop up asking you to type in the user. As indicated by the name, cocoanec uses the cocoa framework of mac os x. Antenna modeling with 4nec2 presented to hotarc by craig weixelbaum may 22, 2014 basic modeling approach using 4nec2 the goals of this 30 minute presentation on 4nec2.
Antenna modeling used to be the domain of scientists and engineers with very expensive antenna ranges covering acres and acres of land strewn with expensive equipment. Ive read a couple of tutorials and i understand most of it so far, still, my simulation doesnt make sense. Numerical electromagnetics code nec2 unofficial home page. Nec is an abbreviation for the lawrence livermore labs antenna. It is very useful for those designing home made antennas for their rtlsdr or other radio, or for those just trying to understand how antennas work. Link here for information and instructions on how to run nec2 in a microsoft windows environment. Hello i am working on circular antennas rhcp and lhcp. Nec simulates the electromagnetic response of antennas and metal structures. Cocoanec open source gui frontend for apple mac os x.
Online tutorials, reference manuals and example files for the application are. If you are a licensed amateur radio operator you are invited to reserve your free space on this server. Nec visualization, optimization and sweeping tool the 4nec2 tool is a windows and nec2 or nec4 based tool for both the starting and experienced antenna modeler that can be used to create, view and check your antenna geometry structure and generate, display and compare near and farfield radiation patterns. Does anyone know where i can find some good tutorial guide to get a basics of how to use 4nec2. Tutorials on how to use 4nec2 forum for electronics. Nec2 information users manual for nec and other information. Settings length unit select your unit, for example. It also includes stateoftheart 3d visualization and a drawing style structure editor. The application is free and it can be downloaded from the download page which can also be accessed by using the download tab button at the top of this page. I have been playing with various antenna modelers eznec, mmanagal, 4nec2 and i keep finding the same counterintutive thing. How to start modeling antennas using eznec greg ordy, w8wwv ctu, contest university dayton, may 19, 2011 version 1.
The numerical electromagnetics code, or nec, is a popular antenna modeling system for wire. Personally, i would use the mac to do all the cadcam, then use a cheap pc to run the cnc machine. Xnec2c is a gtk3based graphical version of nec2c, my translation to the c language of nec2, the fortran numerical electromagnetics code commonly used for antenna simulation and analysis. There are plenty of introductory tutorials, even included with eznec. A wealth of information and tutorials on antennas by the author of the qst series a. Eznec was developed to work on windows xp, windows vista, windows 7, windows 8 or windows 10 and is compatible with 32bit systems.
A wealth of information and tutorials on antennas by the author of the qst series a beginners guide to modeling with nec. Example antenna files can also be downloaded from koks webpage. In this handson session, learn how to use imovie to shorten and arrange your clips, and to add audio, titles, and other effects. Enter the ip address in the server address field and click connect. Antenna modeling software for the mac henry ott consultants. The code was made publicly available for general use and has subsequently been distributed for many computer platforms from mainframes to pcs. When a halfwave dipole is close to ground, the impedance is lowered to near 50 ohms. There is also a sample nec model that you can use to test your setup. Numerical electromagnetic code nec based antenna modeler and optimizer by arie voors. Take a look at my tutorial for describing antennas for wlan deployment. I am very new to 4nec2 and need to do a simulation of a halfwave dipole antenna for 433 mhz.
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