4nec2 Examples


Antenna Modeler and Optimizer using 4nec2 software For antenna design model and optimize the design for analyse and calculate pattern and calculate Power of Receive and Transmit Power of antenna , I am using free and open source antenna modeler and optimizer 4nec2 from Arie Voors. 92 9/24/96 p. Standards Development Branch Allocations and Standards Division. Nevertheless, all three programs--either in all or in advanced versions--include facilities for converting files constructed in their native file formats into a. User's Manual E655 E585 E505 E425 E325, NEC E325 / User's Manual - Page 2 structure, grounding of the lead-in wire to an antenna discharge unit, size. A recent interest in "bent" half-wave dipoles led me to look into the theory of the classic Folded Dipole (FD) in some depth. It is a tool for designing 2D and 3D antennas and modeling their near-field/far-field radiation patterns. NETCALC with Windows, Mac 7. The UI is maddening. Ham radio is a hobby of hobbies - George and. As an example start EZNEC and open BYDipole. I like to place the LPCAD. From my perspective, as a non-engineer, the only drawback to 4NEC2 is that it is. Plus, if you are just learning how to model, learn faster by following the examples. The gain of elevated antennas is especially better for low radiation angles less than 15 degrees. ant) style files and amongst other things convert them (if they are Yagi's) to a monotaper yagi and save in YagiCAD (YC6) format. I There are three ways to view the far field antenna pattern upon creating a model and running it. The radiation patterns and input impedance of antennas are sensitive to the parameters that define their shapes. Here is a simple 1meter dipole example at 299MHz in free space. The NEC files may be used with any of the NEC-2 or NEC-4 programs such as 4NEC2, GNEC or cocoaNEC, however some of them with tapered elements may only be simulated accurately by NEC-4 or other MININEC-based software. Followed by the construction of a sample antenna, measuring its char-acteristics and comparison with the simulation. The example will illustrate both the simplicity and power of HFSS through construction and simulation of this antenna structure. We need a new tag, antenna-modeling. Tutorial and many examples are all included. Field Strength Calculations: Calculating As stated in the previous post, one more piece of information is required to complete the puzzle of calculating received field strength. Then browse to you. Practical and for EZNEC and 4nec2. This has recently changed, we now have allocations at 2200m (135. optimize to use a genetic algorithm to optimize an antenna for multiple frequency bands at the same time (which I thin is not possible in 4nec2). K4ghg Ham Radio 2020 Software Collection* - $6. I'm using 4nec2 for my modelling. antennas with cross-bonded vias, 4NEC2 is not applicable. Some very interesting functions of the NEC 2 programs are forgotten like the Green function, Circular or mixed polarization diagrams, near field, far field, …. 13 Y Parameter Network (EZNEC Pro only) - - - 8. 8 kHz, LF) and 630m (472-479 kHz, MF). It also incorporates the nec2dxs**** executables that integrates NEC2 and SOMNEC into the same executable. using aluminum tubing for example. 4 30 79 20 0. • The complete 4NEC2 help in document format 4nec2/exe/4nec2. for those doing blind tests it's a huge step forward. Presented to HOTARC. 0 40 105 17 1. optimize to use a genetic algorithm to optimize an antenna for multiple frequency bands at the same time (which I thin is not possible in 4nec2). The dipole antenna has two wires. Would the non-grounded trace existing under the SMA connector have any impact on the RF performance of the DUT?. The NEC files may be used with any of the NEC-2 or NEC-4 programs such as 4NEC2, GNEC or cocoaNEC, however some of them with tapered elements may only be simulated accurately by NEC-4 or other MININEC-based software. #3 #1 #2 #4 Antenna 1 Antenna 2. Therefore, you would loose more than half your signal. For example, 4Nec2 and EZNEZ are based on NEC-2, but others such as MMANA-GAL are based in variations of MININEC [Ref. 001-91445 Rev. Where would be a good place to start? The software looks awesome but intimidating. Fear not, [Hunter] has your back with 3D printed and color-coded radiatio…. com in a single category. 4 30 79 20 0. Simple example: 40m dipole Good to sketch it out first, get (x,y,z) coordinates of endpoints of wires. The gain of elevated antennas is especially better for low radiation angles less than 15 degrees. I lose files sometimes in 4nec2, cannot see the logic of that organisation. 2 software, although 4NEC2 software was used to create the plots and diagrams. Example: development and building of a X-band (8 -12 GHz) to L-band (1 – 2 GHz) converter. The antenna model and the definition of its position in the aircraft are discussed in this section. io group will be used for all discussion about the book. yag), MN and AO (. It is a PCB antenna designed by Proant AB and replaces the dielectric SMT chip antenna previously used the “Pi’s”. 47 inches (1/6 wavelength in inches) (top and bottom length as in drawing above) 8. The Bell Ringers are a group of active and retired ham employees of the telephone industry, plus some ham friends with a mutual interest. I will start an NEC thread on the forum and will try to respond to any questions. Does anyone know where I can find some good tutorial/guide to get a basics of how to use 4nec2. 99 + s/h upc: 610563144525 Availability: in stock The 2020 K4GHG Ham Radio Collection* is larger than ever. If you suffer with noise from living in the city, or want the perfect quite EME single antenna or array, this is another low-noise example from G0KSC. … good example of such a problem would be a numerical model of a Yagi -Uda antenna mounted … The design of the antenna can be optimised using techniques such as genetic algorithm optimisers. Then, I selected the two lengths of the wire antenna (short and long) and ran the optimizer with SWR at 100 (minimize SWR). e-3 GW 2 1 0 0. 8288 ft 14 AWG copper wire 52 feet above ground 4Nec2 Example Create the File 1. com in a single category. The 4nec2 tool is a windows- and Nec-2 or Nec-4 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 far-field radiation patterns. For example, 4Nec2 and EZNEZ are based on NEC-2, but others such as MMANA-GAL are based in variations of MININEC [Ref. En vue de la construction de nouvelles antennes je recherche comment paramétrer un trombone (144 par exemple) dans ce logiciel Je recherche également comment paramétrer des éléments isolés du boom. Think of the "Carolina" windom antenna (the modern version of the windom) as an "upside down vertical antenna", hanging down from its counterpoise strung (more or less horizontally) some 10 meters (or more) above ground. nec Then start 4NEC2X and select the new 4NEC2 editor in the settings menu. There are hundreds of examples on the net. A 31 meter wire will bring in tons of signal on the MW broadcast band, for example, but it is optimized for the 31 meter SW band. 4NEC2 is written for Windows operating system. Antenna Simulation Tutorials using 4nec2 1 This entry was posted in Antennas and tagged 4nec2 antenna simulation on February 26, 2015 by KW4FB YouTube user dx2hunt has put together an excellent series of tutorials to get you up and running with using 4nec2 for performing your own antenna simulations. 001-91445 Rev. 4NEC2 The Definitive Guide Book 4NEC2 is a freeware antenna simulation software program. So to start, open your text editor and create a new file named "gh0. Collinear describes two or more things arranged in a straight line. Here's an on-line Folded Dipole Calculator:. Using Polynomial Interpolation with 4nec2 by Duncan Cadd G0UTY It sometimes occurs that in the course of an antenna simulation in 4nec2 it is necessary to include elements with electrical characteristics which must vary according to how the antenna is tuned or otherwise optimised. Implementation of conventional wired reflector Yagi-Uda antenna on 4NEC2 provides gain of 8. Good question. I invite all members who are good in theoretical knowledge, or have good measurement skills & equipment, or have made a DIY CoCo and have good/bad experience of making their CoCo to. 5 pF 55 uH file: 160m80m_broadband_dipole6. generate_one. 43 inches (1/2 wavelength sides each) 13. Antenna Analysis software with the user in mind. See the Noise. Can you make a biquad antenna for 5800 MHz? I am grateful to you. Included stand-alone NEC-TIE app in main YagiCAD directory, also available from Tools menu, that can import NEC(most nec2 and 4nec2 nec), YW(. The 4nec2 modeling program1 contains a model of an 18-sided vertical magnetic loop with an 18-sided coupling loop in the sample file named "models\HFshort\Magnetic. TK 7867 /M47 2006 Upper Saddle River, NJ 8 Design noir: the secret life of electronic Dunne, Anthony TK7870 /D86 2001 Basel 9 Digital and computer projects Davis, Robert J. The gain of elevated antennas is especially better for low radiation angles less than 15 degrees. The Y axis has an manuwl of zero degrees. " "It is also the percentage of the normal terminal voltage at one. 4) When using 4nec2 together with a licensed Nec-4 engine instead of the default public-domain Nec-2 engines, read below item d) first. e-3 GW 2 1 0 0. Bonjour à toutes et à tous. In 4NEC2, you can override these frequency settings by choosing the Frequency Sweep option. Above is an example where the Z0 has been set to 0. The result is an ultra clean antenna which will be a stunning performer for 144MHz. txt file is only used as an example. The shunt is a biased on diode connected to the antenna a 1/4 wavelength away connected to ground. Ideally, no part of either antenna should extend into the plane of the orthogonal polarization. NB: If you have never used a separate receiving antenna, please note that a basic precaution consists in short-circuiting the input of the receiver (for example, by means of a coaxial relay) during transmission. Loading Unsubscribe from The DB?. It is a free program and, like EZNEC, includes a good number of pre-built antenna models, many developed by W4RNL. Some very interesting functions of the NEC 2 programs are forgotten like the Green function, Circular or mixed polarization diagrams, near field, far field, …. Brief overview of some 4Nec2 tools What this presentation will not cover: 1. Here is a simple 1meter dipole example at 299MHz in free space. The bottom line is that a file created under one system with a NEC core is convertible into a file to be saved under another system. png" alt="4NEC2 Gain Calculation" %}. The antenna design software ' 4nec2 ' ( outstanding !) was used to optimize and produce field patterns for the diagrams illustrating this article. Details Created: 13 November 2016 Previously I had created a couple of antenna models using the 4NEC2 software however as I slowly continue to learn how to navigate the software and accurately model an antenna I found that my first model was way off, and that would include my assesment of the triangle loop at 1100 feet. 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. Nec2++ replaces these cards with function calls each function call the equivalent of an nec2 card -- here's an example. It comes with lots of example models to learn. Using Polynomial Interpolation with 4nec2 by Duncan Cadd G0UTY It sometimes occurs that in the course of an antenna simulation in 4nec2 it is necessary to include elements with electrical characteristics which must vary according to how the antenna is tuned or otherwise optimised. using 4NEC2 software. 4 30 79 20 0. 1a formatted binary document (WDBN) version,. Of the 25 elements 8 are used as directors, 14 as reflectors and 3 as. The gain values shown in the following 4NEC2 results do not include balun loss or mismatch loss. pw/download?file=4nec2+examples Read Online 4nec2 examples: http://qcg. 4 and TANT Appendix Version 1. The examples in this page will assume you downloaded and saved r. The Carolina Version. Double BiQuad sector antenna for 2. 0 Simulation of wire antennas with NEC NEC (Numerical Electric Code) was de-veloped in 1981 by the Lawrence Liver-more laboratory for the American Navy as a simulation method for wire. Skip navigation Sign in. You can then run multiple EZNEC test cases while AutoEZ automatically changes one or more variables between runs. 7520 ∘and 7. About YagiCAD - Antenna modelling examples The resource is currently listed in dxzone. Transmission Lines, Antenna Tuners, and Impedance - other NEC programs 4NEC2, NEC4Win etc. Once you see the "Press Enter to Continue" line, the NEC input file has been saved in the current folder (where LPCAD is located). For example i got fully lost in the organisation of this soft. OFF Center Fed/Loaded HF Antennas VE3KL •Searching for the elusive 40,30,20 m Short Antenna •Small, no bulky traps, minimum of components •Leads to a general design approach for a broad class. Examples FO0AAA triangle / delta Beverage Twin Triangle Linear Inline targetX Antenna - LIXA Staggered beverage Linear Inline Receiving Array - LIRA. Brief overview of some 4Nec2 tools What this presentation will not cover: 1. NEC2 capabilities 3. Some parts of the Antenna Magus website such as the installation and update download area, the full release notes and information on some of the antennas included in Antenna Magus will remain available at www. 7 Circuit analysis: a systems approach Mersereau, Russell M. (This file still doens't work though. Tweak and re-run 4Nec2 simplifies these steps through its user interface 4Nec2 Example 40m ½ wave dipole antenna in free space (no ground) Center Freq = 7. 1 computational engine with the GN2 ground code. bat file and corresponding model files for running under 4Nec2 based on the model defined in model. The 4nec2 tool is a windows- and Nec-2 or Nec-4 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 far-field radiation patterns. Experimental prototype antennas always work while the production versions never seem to work as well. This online calculator can be used to find the length of the dipole antenna. EZNEC and 4NEC2 hide the complexity of entering NEC commands behind a Graphical User Interface (GUI) that is common to modern software. I understand that my comment is too generalising, just an impression, but it is annoying me most of all. NEC-2-- Method of moments engine with text punchcard interface. Example model 5. Figure 1 is an example, but you really have to see it in color to fully appreciate how much information is in a single pattern. Many shortcuts are built in. Every model uses Symbols to vary conditions and to Optimze or Evolve for best results. (from 4NEC2). An improvementofmorethan10dBovertheresultsreportedin [9,10]hasbeennoticed. for example tag 1 is 81 mm long and should be segmented as: GW 1 8 0 0. 0 May 2011; Page 2 NEC Corporation has prepared this document for use by its employees and customers. {% include image. If the PCB thickness is 1mm, it will be lighter. Automated updates will continue to be made available through the Antenna Magus interface. nec matched configuration. International Journal of Engineering Research and. The design was carried out with the 4NEC2 (Numerical Electromagnetic Code) and HELIXCALC software. In this page you will find an analysis of several monopole configurations, the differences between a perfect and an imperfect ground and the effects of using a ground plane made of radials or counterpoises. 61dBi and. an excellent example of this sort of thing called 4NEC2 which is available for free as detailed in Reference 4. Simple example: 40m dipole Good to sketch it out first, get (x,y,z) coordinates of endpoints of wires. radio-astronomy. The analysis are based on simulations performed with the 4NEC2 software and are performed introducing new elements in successive aproximations. 4NEC2 can open an EZNEC file with an extension of. The antenna model and the definition of its position in the aircraft are discussed in this section. • 4NEC2 is good for a beginner of Antenna beam pattern to understand. The program can be used to model an antenna, and then determine through. The gain of elevated antennas is especially better for low radiation angles less than 15 degrees. NEC-2-- Method of moments engine with text punchcard interface. WDBN version 0. Simulation of wire antennas with NEC NEC (Numerical Electric Code) is a simulation method for wire antennas developed by the. Click on the image to the left to see a screen shot from EZNEC v. The goals of this A Beginner's Tutorial for 4NEC, a NEC2 Distribution. To run 4NEC2 in Ubuntu, I use Wine as an installation tool for the reasons I have described in my previous posts. (Example: for channel 2, the frequency is (6 x 2) + 45 = 57 MHz, so the wavelength on twin lead is 0. 0 cm, determine the energy stored in the air gap if the flux density is 10,000 gauss. 1): Model: simulation set made up of all the radiators of the antenna (including the loads), the generator and the type of ground. For installation instructions and a bunch of good tutorials, please refer to the website. NEC based antenna modeler and optimizer. Every one of the studies includes the 4NEC2 model used. S11 is known as the return loss, or how much power is reflected from the transmitter to an antenna. 8 kHz, LF) and 630m (472-479 kHz, MF). The informa- tion contained herein is the property of NEC Corporation and shall not be reproduced without prior writ- ten approval of NEC Corporation. The radiation patterns and input impedance of antennas are sensitive to the parameters that define their shapes. Upgrade: For those who purchased the FULL COLLECTION 1st Edition, there is a special discount to upgrade and double the collection. Then, having read that. 95 x 300/57 = 5. Here's an on-line Folded Dipole Calculator:. nec matched configuration. A scientific calculator such as calc. for those doing blind tests it’s a huge step forward. 4NEC2 is very user friendly software we found it easy to handle and develop antenna. We will be showing several designs and how they were modeled using 4NEC2. When operated at a frequency corresponding to a standing wave of 1/4-wavelength along the transmission line, the line’s characteristic impedance necessary for impedance transformation must be equal to the square root of the product of the source’s impedance and the load’s impedance. Arie Voors, the author of 4NEC2, has produced a fine piece Of software', it handles all the possible tasks that one could ask of the NEC2 engine and then some. The book is the software manual for HOBBIES. 48 , and wavelength 0. A correspondent has been tearing his hair out trying to replicate my VSWR plots of some STL. 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. 5uH coil 2m from the feed point: Wire alone modelled in 4nec2. Hi-VHF Folded Dipoles with wide variance in element sizes analyzed using 4nec2. A recent interest in "bent" half-wave dipoles led me to look into the theory of the classic Folded Dipole (FD) in some depth. With 4NEC2 an NEC based antenna modelling and optimizing computer application the proposed 1/4 λ wave ground plane antenna was model tested for various element dimensions and radial element angles. com in a single category. Some of the default 4nec2 capabilities:. Brief overview of some 4Nec2 tools What this presentation will not cover: 1. Figure 2—The NEC-Win Plus basic entry screen for a load consisting of a resistance and a reactance in series (called a "complex load"). 4nec2 is a user-friendly layer around the standard nec-2 engine. I assume all - so use CTRL + A windows shortcut for convenient marking of all wires. I decided to start this thread to find out the truth. The structure's simplicity allows robustness and easily predictable radiation properties, beneficial for several measurement systems. N4IS Waller the Waller receiving antenna example includes the use of a resistive load. So to start, open your text editor and create a new file named "gh0. electronics. Besides the information about this validation test found on the net, reading how W7RNL (Cebek) uses AGT values to correct gain values is insightful. So I decided to model it using 4nec2 and re-design it optimised for portable use. For example, wires can be rotated with a simple command to design vee and delta loop antennas without having to polish your trigonometry skills. The 4NEC2 simulation program was used to evaluate an d optimize the antenna design. (307) 222-4712 [email protected] Meier of Sources of Insight Thinking is great. Here's what I have so far but for a tape measure they need to be rotated. 4NEC2 does have a simple tool for impedance matching that allows you to set the Q of the inductors and capacitors in the match. For example: The antenna will be resonant at 80 & 30m, as well as all even harmonics, by placing a 213pF, say 220pF capacitor in series with a 4. N3OX wrote: I actually checked a model of a 1m magloop on 7MHz consisting of 5 parallel wires separated out 3 inches and connected in parallel with straight wires, and this has the opposite problem as the 5 wire multiturn: in this case, the middle loop has 30% less current than the two outer edges: seems plausible that this is the discrete-wire equivalent of currents bunching on the edges of a. A 31 meter wire will bring in tons of signal on the MW broadcast band, for example, but it is optimized for the 31 meter SW band. 1): Model: simulation set made up of all the radiators of the antenna (including the loads), the generator and the type of ground. A free and open source software to solve partial differential equations (PDE) using the Finite Element Method (FEM). For example, the wavelength for 433. 4NEC2 TUTORIAL PDF - 21 Nov Appendix B - NEC User Manual Installation. The example will talking about design 300 MHz antenna with SWR 1. The default antenna is centered at the origin and uses an FR4 substrate. 45-in, so Gap Size in Unimportant. Example model 5. optimize to use a genetic algorithm to optimize an antenna for multiple frequency bands at the same time (which I thin is not possible in 4nec2). The presentation will cover software that can be used for modeling a wide range of antennas. It also displays certain information about your antenna, including. The loading makes the match very narrow-band. The Carolina Version. No clear explanations of the limitations and errors using the NEC 2/4 appear in the book. If 4nec2 was not installed in the default folder, the Open file box could show up. For example, I have found that my 20m vertical end fed half wave antenna with the bottom 1m from the ground is an extremely effective antenna. The radiation pattern of an inverted V is slightly bi-directional, with much of the energy going in the up direction (suitable for close-in NVIS at low frequencies), as shown in the 4nec2 output below. The transmitting antenna is a 5 1/4 turn helical antenna just below the LNB (see pictures). ) (Coax feed point distance from bottom). nec matched configuration. EXAMPLES OF FAILURE OF SIMULATION SOFTWARE Most of Collinears posted on internet are flawed design. By using these antennas students are able to increase decrease the range of the HAM radios. ForNecToo wrote:You could take a look at the coax. For example, 4Nec2 and EZNEZ are based on NEC-2, but others such as MMANA-GAL are based in variations of MININEC [Ref. At each length, the termination resistor was optimized for F/B. 4Nec-2 is driving me nuts. I’ve chosen Arie Voors’ 4nec2, because, first off all, it is totally free software, moreover quite easy to use, with good documentation and a lot of examples, so I should be far sufficient for my needs. This is an example with 4NEC2 optimizer: After a couple of runs, the optimizer will find the right impedence value: in this case is 985. Report comment. 4NEC2 does have a simple tool for impedance matching that allows you to set the Q of the inductors and capacitors in the match. The 4nec2 holds a scaling function in the Geometry Editor First select which wire shall be scaled. For > > example, the uglier the antenna, the better it works. generate_one. Al Legary - VE3SQB - admits that he is a "quad" man. 43 inches (1/2 wavelength sides each) 13. 4 Description: 4nec2 is a 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. Loading Unsubscribe from The DB?. By proper definition of dimension variables, it is even possible to optimize while enforcing symmetry for example. Essentially it is the power that is not lost as heat in the antenna system itself, and it ignores external loss from the ground in the near field. I used symbolic format. This month we'll work with three clusters of ideas: the. simulation 4NEC2 is simple software use supernec (it is run with matlab 6. Once you see the "Press Enter to Continue" line, the NEC input file has been saved in the current folder (where LPCAD is located). These models will indicate in the CM lines if they need to use NEC-4 or 4NEC2. ) (Coax feed point distance from bottom). \4nec2\Models\HFsimple folder. This was formerly the Toy and ToyBox codes. I've seen some "stacked" dipoles that aren't stacked anymore but transformed into lazy H antennas. Design of antennas using different theoretical models and software, such as ADS (Analysis Design System) and Momentum or 4NEC2. 4nec2 contains an optimizer which can optimize certain characteristics of your antenna by iterating values. The rest is examples you can't run with the supplied version. Introduction. gov University of California Santa Cruz, Mailtop 269-3, NASA Ames Research Center, Mo ett Field, CA. "As explained in the most recent TIGHAR Tracks (Oct. The free end of each wires are pointed towards opposite direction of the other free end. com Search for seller ID “ gnupic”. 10 Two Element Cardioid Array Example - - - 8. The essential point to remember is that the radiation resistance of a magloop is very low. I understand that my comment is too generalising, just an impression, but it is annoying me most of all. for example tag 1 is 81 mm long and should be segmented as: GW 1 8 0 0. So far ive been able to calculate the example shapes of cars, boats, planes and even battle tanks but even the given examples are full of errors?. #3 #1 #2 #4 Antenna 1 Antenna 2. 8 4nec2 is a completely free Nec2, Nec4 and windows based tool for creating. 7 Circuit analysis: a systems approach Mersereau, Russell M. OFF Center Fed/Loaded HF Antennas VE3KL •Searching for the elusive 40,30,20 m Short Antenna •Small, no bulky traps, minimum of components •Leads to a general design approach for a broad class. Can you make a biquad antenna for 5800 MHz? I am grateful to you. The commercially available version of this antenna is intended for permanent installation and is way too large and heavy for portable ops. 4) When using 4nec2 together with a licensed Nec-4 engine instead of the default public-domain Nec-2 engines, read below item d. for example tag 1 is 81 mm long and should be segmented as: GW 1 8 0 0. One of the members commented to me that I should write an article about collinear arrays so that we could all build our own. 4 GHz / WiFi / WLAN Introduction This is basic instructions on building a handmade Double BiQuad antenna for WiFi/WLAN 2. Comparison between induced EMF and 4nec2 models. Run the program, 4nec2. Multilingual MM Antenna Analyzer (MS Windows) "MMANA-GAL basic is still free for Amateur Radio Use" What Happened to the MMAMA Program? MMANA has a new name. 0 as a reference. You can design standalone antennas and build arrays of antennas using either predefined elements with parameterized geometry or arbitrary planar elements. Updated Wed Jul 17 15:54:14 EDT 2019. The design was performed using NEC4. CALM Example CSV-19 Cv 5. The first online Dipole and Inverted V calculator on the page below has been around for many years and is designed as a simple "shortcut" so you will not have to do the math using the standard formulas for designing a horizontal dipole or inverted V dipole. I wanted to model a turnstile antenna with a reflector for 1280MHz. The sample version of the book is complete but the full version is in progress. I would guess that the biggest hurdle for many is using Octave/MATLAB. Example of using 4NEC2 to read the 20m Carolina Windom EZNEC format file from the ARRL 22nd Edition Antenna Book compilation of. Gary Crum KK7DV. EZNEC and 4NEC2 hide the complexity of entering NEC commands behind a Graphical User Interface (GUI) that is common to modern software. I will start an NEC thread on the forum and will try to respond to any questions. 0 Simulation of wire antennas with NEC NEC (Numerical Electric Code) was de-veloped in 1981 by the Lawrence Liver-more laboratory for the American Navy as a simulation method for wire. If the ends of these same dipoles are separated so that the distance from center to center is 3/4 wavelengths and they are driven from the same source, the gain increases to approximately 2. 09% fractional impedance bandwidth. S11 is known as the return loss, or how much power is reflected from the transmitter to an antenna. Figure 2—The NEC-Win Plus basic entry screen for a load consisting of a resistance and a reactance in series (called a "complex load"). Basic Modeling Approach using 4Nec2 The goals of this 30 minute presentation on 4Nec2: 1. Keep in mind bow tie type antennas are of a broad band design and are closer to one wave length wide. Thanks for the welcome Marconi. In order to. 7 mtr installed horizontally at 2. If the length of the conductor is a certain ratio or multiple of the. Some Examples - - - - - - 8.