4nec2\exe” folder, in your Word or Wordpad text editor. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and . 4NEC2 is a freeware antenna simulation software program. The program can be used to model an antenna, and then determine through. Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this
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I have used this capability to compare and plot my actual antenna with the model antenna and you can see results on my qrz. The main attraction of 4NEC2 is the graphical entry of antenna models.
Two wires may not meet in the intermediate points of any of their segments [Ref. Once the model has been defined, some programs implementing the NEC-2 algorithm provide options for geometric validation in order to look for non-connected wires or incorrect crossings, as well as segment validation options to verify whether the rules described in the previous sections are observed. V The data information returns, after running the model, on the main page, antenna 4nec22 and radiated power relative to fed power.
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Or balance all of these in weighted format. If this rule is not observed, the model probably has defects in the specifications of the generator or maybe the generator is located in the wrong place. The following angles are defined: The understanding of the coordinate system employed in a simulation program is fundamental both for the design of the models and to correctly evaluate the results of the simulations.
Very complex patterns appear at all bands c 3D wire view that is selectable on the antenna view that shows as default.
Version 2 Aug This is the most precise technique from the point of view of the simulation of the impedance of the antennas, provided that the length of the three segments of the additional wire is similar to the length of the segments of the two main wires. NEC-2 is not adequate to model small size loop antennas perimeter lower than 0.
After thousands of optimizer iterations, It looks pretty good. In this view one can show the antenna, and, its full 3D, color coded in terms of dBi gain, visual view. Results of the average gain test in a 4Nec2 model. I used this view to understand my 80m OCF on 40m, 20m, 17m, 12m, and 10m. I manjal LB Cebik’s Antenna Modeling book and have begun to learn this software manuaal an incredibly exciting voyage thru these dreary winter months!
The Other Edge of the Sword”. The average 4ndc2 test is an useful tool to check the validity of a model and it is manula in practically all the programs implementing NEC Even if y ou know what you are doing. The optimum segmentation level will be achieved at the step where no significant changes in both parameters are seen [Ref.
Note that some of the rules are not applicable majual later versions of the algorithm NEC3 and NEC-4which are more advanced and whose code is not available to the public. I finally discovered 4NEC2, thanks to the eHam reviews.
Stick to the stock editor to begin. The 4nec2 base part works fine for 2D, but if you want the 3D modeling, get the 4nec2X download as well.
4NEC2 freeware antenna modeller and optimizer Product Reviews
If it is considered that the transmission line may have influence on the radiation of the real antenna which is being simulated, it is possible to try to create a model of the line in some particular cases, such as with ,anual parallel transmission line.
Geometry and operative aspects of the simple modes of ionospheric propagation.
The optimizer is just plain awesome and has saved me so much time and generates significant improvements on all my designs. The Z axis will represent the height of the antenna over the ground plane XY. The Sommerfeld-Norton S-N is the most precise ground model, with the highest computational cost and is the best method to simulate horizontal wires very close to the maunal.
W8IO Antenna Site – TANT and 4NEC2
This problem can be minimized making the diameter of the wires to change in a series of steps through several additional intermediate wires [Ref. Finally, one design came through as the best compromise.
In order to determine the optimum segment densityit is interesting to perform a convergency test see section 7. Length of the segments. If you get an option box asking what type of graph you want, check the “far field option”. If the model includes ground, it will be located in the XY plane. In order to make possible the comparison of the radiation patterns os different antennas in an easy way, it is advisable that all the models are represented geometrically agreeing with a set of general conventions.
This displays the antenna and models its output.
At first, antenna modeling software is difficult to understand, primarily because of the Cartesian coordinate method used.