4nec2 Dipole Model

The goals of this A Beginner's. 160M Is a Tough Band • Propagation quite variable, signals often not very strong, heavy QRN during the summer -Mostly a nightime band, varies a lot through the night -During the winter, 800 miles or. 4Nec-2 is driving me nuts. nec' in the Intro Files download you can see edge currents on the groundplane (phase and amplitude). The amount of energy radiated in a particular direction (relative to the amount of energy that would be radiated by a theoretical omni-directional antenna) determines the gain in that direction. The goal for a wire model of an end-fed half-wave dipole antenna with no special simulator tricks (like EZNEC’s transformer function) is achieved. I have uploaded an updated 574 version onto my website. The QSL bent dipoles website is an antenna modeling "tour de force" about the many ways a center-fed dipole can be bent to fit available space. Key points include: This was optimized with NEC4. From comparison with previous modelling above very poor city ground, one may conclude that, at least at a height of 16. Wires with the same endpoints are joined together. An End Fed Half Wave Length Antenna is a variation of the much more common half wave length dipole antenna. Here is a photo of a low dipole that can be used for 40 or 80 meter NVIS; it is a cross dipole and can have both 40 and 80 available at the same time. For an inverted-VEE or sagging dipole, use two wires and a third, short wire in the center for the feedpoint. The dipole wire is one end of the line, while a new short 1-segment line ter-minates the transmission line. Stay here to learn how to design a 3 element yagi for whatever frequency or wavelength you want. -----copy the text below this line and until end line into your 4NEC2 notepad editor----- CM Emir Shabashvili, KK4MJA CM MFJ-2220 hamstick dipole model tuned for 14. layout of such a standard sort of model using a transmission line used with a di-pole. txt appended (you’ll need to remove. 2 dBi) due to higher gain. They have not been verified by the ARRL Lab. I wanted to model a turnstile antenna with a reflector for 1280MHz. 6 Meter Aluminum Dipole Antenna Parts list: The 6 meter dipole uses the same parts as the 10 meter model, less the 6-foot length of. These parasitic elements are the reflector and the director. 160m dipole 160m dipole pattern The structure of the 160m dipole is very simple, 75 meters of wire with a feed point in the middle, 15 meters over ground. The Big Gun (Optimization) Optimize (Tune) a 2 metre dipole to 6 metres Adjust reactance to zero Results L= 2. After reading Tony’s write-up on his portable linked inverted V dipole ( April 2017 Nerg News) I was motivated to see if I could do a workable model for the antenna in a general purpose antenna modelling package, for me the best choice for this is 4nec2, it is free, and has many features even the paid for packages don’t offer. The "Geometry" tab in the "4nec2 Edit" window is where you will define your antenna's structure. 8:05-9:00pm: A tutorial on Antenna Model-ling with the 4NEC2 software was presented by Tom McDermott, N5EG, and we got to (Continued from page 1) needed for various races and events. 4NEC2 is a freeware antenna simulation software program. Antenna Over Ground: Model, Results 91 + Example 4, T Ant. 3 dBd]if reoptimized for slightly worse F/B & F/R, a few more tenths of dB of Gain MIGHT be squeezed out of it:. j'ai retiré du disque le mmana que j'utilisais avant. Buddipole 4NEC2 Model Files I have found a way to post my 4 NEC 2 Buddipole modeling files on line using Google Documents. But I've seen articles and spec sheets that call the stock "rubber duck" antennas that come with many routers and client radios dipoles. Video Tutorial on Receiving ISS Astronaut Amateur Radio Conversations with. Cebik W4RNL's website on antennex. First Test Station Details K6PZB Reference station, ground mounted half-wave vertical dipole, 1000 foot distant, LOS path in the same park as the transmitter. Using the 4NEC2 Editor 5. Hence, the minor lobes are avoided and the directivity is increased. The Big Gun (Optimization) Optimize (Tune) a 2 metre dipole to 6 metres Adjust reactance to zero Results L= 2. Sonst funktioniert die Koordinatentransformation von 4NEC2 nach Wattwächter nicht. 5" diameter FM loop. This project consists of an attempt to design Single-Band Optimized Log-Periodic Dipole Arrays which have the same or better performance characteristics (VSWR, Gain, Front-to-Back, Front-to-Rear, high G/T, etc) as those of a similar boom-length monoband Yagi. I find the program EZNEC free Demo version 5 easier to use since all the information is in one program. Antenna Modeling With 4NEC2. By reviewing the photoluminescence properties of all the lanthanides, the model's applicability was restricted to Nd3+, Sm3+, Eu3+, Tb3+ and Dy3+. For this kind of application, we move the source from its usual position at the center of the dipole and place it on the new wire. 3042035 meters · Reflector/dipole spacing = 0. A 4NEC model (more detail later) of the 40m Dipole is shown below with exact dimensions/approximate orientation to the antenna placed in my backyard including insulated wire with the type and thickness of THHN wire 14 gauge. ) The tuner. 3 'Mounted on mast SY WL=1. The radiation pattern of this helical antenna is a combination of short dipole and loop antenna. to an isotropic radiator and behave like a dipole. Modeling a 5/8 wavelength linear loaded antenna for the CB band and tuning it in the modeling software. At this height, the dipole will not produce a pattern that looks anywhere near the figure 8 pattern that a dipole in free space produces. I’ve constructed a 144/440 Dual band Open Stub J-Pole Antenna. Paul McMahon VK3DIP. One issue with dipole design is impedance matching with a 50 ohm source since the dipole has an input impedance of around 73 ohms which I got around part of the problem by using 75 ohm coax but you still have the reflection loss from the 75 ohm coax to the 50 ohm scanner or whatever your connecting it to. 5 db of gain more than what you would get with a discone antenna. Presented to HOTARC. ANTOP Smartpass Amplifier for HDTV Antenna, Compatible with All Passive Antennas,Built-in 4G LTE Filter-Booster,Supports Over-The-air TV Signals Including HDTV, 1080P TV and 4K Ultra HD. Moxon Antenna: I am researching antennas for my GCS and I came across moxon on antennas and this tool to give you the dimensions for a moxon antenna for the frequency you input. 9" behind driven element. files: dipole. May 22, Basic Modeling Approach using 4Nec2. Paul McMahon VK3DIP. The above figure shows the radiation pattern for normal mode of radiation in helical antenna. 60 dB for a proper model stacked per DL6WU formula: Let us look at what a difference this wrong AG does to the Yagi in the G/T tables. 160m dipole 160m dipole pattern The structure of the 160m dipole is very simple, 75 meters of wire with a feed point in the middle, 15 meters over ground. Wilson Drive 4G-X is the most powerful 4G vehicle booster sold. 13 Ohms Vary Length. Use 4nec2 antenna simulator/optimizer • Model the PVC coated wire, use average ground: h = 7 to 12m • Adjust the antenna length (no loading) to resonate at 14. 4NEC2 TUTORIAL PDF - 21 Nov Appendix B - NEC User Manual Installation. Figure 9 ~ RF transmission level diagram for the LWA antenna and receiver systems at CRO. 4nec2 far field pattern. Have a look at the 'Introduction to Phased Array Design' section on my website, there is a 4NEC2 model of a 6x1 element array on a finite groundplane. expression found in part (g) show consistency with the beam pattern plot produced by NEC? Discuss. py code to render the antennas. For an inverted-VEE or sagging dipole, use two wires and a third, short wire in the center for the feedpoint. YAG 315-12H. 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF Construction and 4nec2 Model of a 144 MHz Halo Antenna. 3270188 meters · Director length = 0. 4NEC2 is a freeware antenna simulation software program. Dipole Quadcopter Suburban Clutter 10' Vertical Dipole, 100 mW Beacon 5' Whip Figure 4 — Paths from various heights to a distant local station. NEC Model Library The following files and links point to NEC/AO/YO models of various Ham antennas that I have simulated and/or tested over the past 30 years as an antenna designer. Note that the small dipole used in this work is smaller than the 1/50th of the wavelength so the 4NEC2 work should be comparable to the analytical work. My understanding is that a dipole antenna is in the shape of a T where the length of each horizontal branch is equal to a quarter wavelength. This project consists of an attempt to design Single-Band Optimized Log-Periodic Dipole Arrays which have the same or better performance characteristics (VSWR, Gain, Front-to-Back, Front-to-Rear, high G/T, etc) as those of a similar boom-length monoband Yagi. Link here for information and instructions on how to run NEC2 in a Microsoft Windows environment. Using the 4NEC2 Editor 5. The radiation pattern of his antenna also looks very good. Diamond D130J (Icom AH7000) Discone Antenna (A Universal Discone 4nec2 Model) The Diamond D130J (also marketed as the Icom AH7000) is an ultra wide-band omnidirectional vertically polarized antenna designed to receive over the 25-1300 MHz frequency range. 4Nec-2 is driving me nuts. Description, LongWhip with RedCoil and 4 Dipole Arms on Versatee w/ TRSB set to 25ohms (2:1) and 1 8. 8 dBi) gives much better range than 1/2 wavelength dipole (2. The basic idea of the G5RV is a balanced 80m half-wave resonant antenna with a section of high impedance line at the feed point to aid in matching the antenna to the rest of the coax transmission line to the source. Gain, VSWR, impedance, front to back ratio are the main requirements. frequency Impedance (real & imaginary) vs. Perfect gain and SWR on both bands. 75 m (55 ft), VSWR is hardly influenced by ground quality. This is a 3rd. 4nec2 è uno strumento NEC2, Nec4 completamente gratuito per la creazione, la visualizzazione, l'ottimizzazione e il controllo delle strutture di geometriche delle antenne in 2D e 3D. 25, 19 Jul 2019 Dan Maguire Current users: If you would like to update your copy of AutoEZ to the latest level just use your personal download link to obtain the most recent installer ("autoezsetup. The amount of energy radiated in a particular direction (relative to the amount of energy that would be radiated by a theoretical omni-directional antenna) determines the gain in that direction. A shortened 40 meter rotary dipole. This arrangement not only helps to avoid the radiation perpendicular to the antenna plane, but also helps the radiated energy get diverted to the direction of radiation of the whole array. Optimized for 144 - 145 MHz or 144-146 MHz and 432 - 434 MHz or 430 - 440 MHz. The 4:1 VSWR is also far too high. How good is a G5RV and how do they work? Ham Radio Antennas. The first plot below shows a dipole at an elevation of two wavelengths above a standard earth ground model. The picture on the right above shows an OCF Dipole with the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. layout of such a standard sort of model using a transmission line used with a di-pole. A 4nec2 Model for a Linked Inverted V Dipole. A pipe cutter is perfect for this job, but finish off with a file to make the cut straight. A simple test for NEC2 impedance estimates would be to construct a folded dipole model for NEC2 - vary the diameter of the top element and check the results against the standard formula for dipoles with unequal diameters. My understanding is that a dipole antenna is in the shape of a T where the length of each horizontal branch is equal to a quarter wavelength. 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. Simple example: 40m dipole Transfer antenna elements to spreadsheet (CocoaNEC) Rule of thumb: ≥10 segments per half-wavelength (should be odd) In the model, dipole is one long wire, not two (software inserts the source). The goal for a wire model of an end-fed half-wave dipole antenna with no special simulator tricks (like EZNEC’s transformer function) is achieved. 3 'Mounted on mast SY WL=1. The usual dipole spacing will be λ/4 or 3λ/4. We use an interpolation approach. This entry was posted in 4G LTE Cat4 Mobile WiFi , 4G Mobile WiFi , Mobile Pocket WiFi on December 16, 2013 by 4G LTE Mobile Broadband. zip-- Dipole models. Perfect gain and SWR on both bands. May 22, Basic Modeling Approach using 4Nec2. 4NEC2 is a freeware antenna simulation software program. Use 4nec2 (on PC) or CocoaNEC (on Mac OSX) to model the four element antenna array. 546 feet long or 6. Presented at ARRL Pacificon Antenna Seminar October 18-20, 2019 Steve Stearns, K6OIK [updated 10/25/2019] ABSTRACT: The dipole is the most basic of antennas. Coloured 3D Presentation 5. Listed under the Antennas/Dipole category that is about Dipole antenna. Has anyone found or written one? I am building a 75 Ω fed OCFD and need to model the radiated patterns, but I have no data for 4nec to add a balun. YAG 315-12H. Used 4NEC2, to model and analyze gain, directivity, SLL, impedance and VSWR. A design technique for wire antennas, based on the Structure-Based Evolutionary Programming, is used to design a broadband antenna with an end-fire radiation pattern and a very simple geometry, operating in the 3–16 GHz frequency band, namely, from the S band to the Ku band. Modeling a 5/8 wavelength linear loaded antenna for the CB band and tuning it in the modeling software. py code to render the antennas. Entering data in the 4NEC2 program The 4NEC2 program helps the designer to create and optimize its antennas. EZNEC and 4NEC2 hide the complexity of entering NEC commands behind a Graphical User Interface (GUI) that is common to modern software. Oct 23, 2019 - This Pin was discovered by Ernest. Each line will be assigned a reference number, a number of segments, and a radius. CM BBTD BroadBand Terminated Dipole (c) in the shape of a square base pyramid CM For model purposes, use Characteristic Impedance 800 ohms source CM More. The wires of the model are numbered as shown in the table 1. Note: this Split feature can only be used with two wire connections. The basic idea of the G5RV is a balanced 80m half-wave resonant antenna with a section of high impedance line at the feed point to aid in matching the antenna to the rest of the coax transmission line to the source. In the above picture it is deployed as a horizontal dipole, with the 80 meter legs extended, and the 40 meter legs left coiled up. Just One Wire? This dipole is a single wire in 4NEC2 and not cut in half like a physical antenna. Does the A. 8288 ft 14 AWG copper wire 52 feet above ground 4Nec2 Example Create the File 1. Here is the 4nec2 model file with. 4nec2 Antenna Modeling of Near Field Antenna Interaction - Duration: 10:40. Optimized for 144 - 145 MHz or 144-146 MHz and 432 - 434 MHz or 430 - 440 MHz. The rectangular patch excited in its fundamental mode has a maximum directivity in the direction perpendicular to the patch (z-axis or broadside). 4g lte gun diy vs mimo antenna observation I have noticed between this 4G DIY Antenna and MIMO Antenna which available in the market had a different performance depends on the weather condition. Presented to HOTARC. yag 312-10m. yag 310-08h. Has anyone found or written one? I am building a 75 Ω fed OCFD and need to model the radiated patterns, but I have no data for 4nec to add a balun. In model file "TrapDipole" I changed Z dim to 20 to simulate 20 meter height of wires, and simply moved the dipole up to 20 meters. 13 Ohms Vary Length. Oct 23, 2019 - This Pin was discovered by Ernest. 4NEC2 TUTORIAL PDF - Antenna Modeling With 4NEC2. 360 degree reception - greatly improved reception versus internal or simple indoor dipole antennas. The curved portions are work. The last three items are continuous variables, overall wire length, length fraction for feed position, and mismatched transmission line length, and they can all be varied in the 4NEC2 model program. frequency Impedance (real & imaginary) vs. The goal for a wire model of an end-fed half-wave dipole antenna with no special simulator tricks (like EZNEC's transformer function) is achieved. 000031304 'Inductance of the loads in H (0. Well now I don't what is true. May 5, 2016 - Homemade TV Antenna: This TV antenna is not only omnidirectional, but also compatible with the new digital television. 4nec2 Model of Coax-Fed Dipole Shows Currents in Wires •3—D pattern for dipole fed by a 2 coax length, or with a choke / balun at the feed point. yag 312-10m. YAG 240-20H. YAG 310-08M. The goals of this A Beginner's. Here is a photo of a low dipole that can be used for 40 or 80 meter NVIS; it is a cross dipole and can have both 40 and 80 available at the same time. If traditional antenna theory says that the impedance of a half wavelength dipole in free space is around 72 Ohms at resonance, and a model taking into account the wire diameter and the height about ground reports 65 Ohms, and the measured value is 61 Ohms, we can be more confident that we have built a form. The dipole is now 33 feet long with 11 segments and is 33 feet above ground. Is a Dipole better than a Cobweb Antenna? Ham Radio Aerials. Antenna Modeling With 4NEC2. com describing antennas for WLAN deployment. • Many antenna model examples: 4nec2/models. I wanted to model a turnstile antenna with a reflector for 1280MHz. In model file "TrapDipole" I changed Z dim to 20 to simulate 20 meter height of wires, and simply moved the dipole up to 20 meters. Each line will be assigned a reference number, a number of segments, and a radius. 3042035 meters · Reflector/dipole spacing = 0. Video Tutorial on Receiving ISS Astronaut Amateur Radio Conversations with. The Big Gun (Optimization) Optimize (Tune) a 2 metre dipole to 6 metres Adjust reactance to zero Results L= 2. 4NEC2 TUTORIAL PDF - Antenna Modeling With 4NEC2. 4nec2\exe” folder, in your Word or Wordpad text editor. 5 is the normal half-wave dipole with the expected impedance of about 72 Ω. A shortened 40 meter rotary dipole. 60 dB for a proper model stacked per DL6WU formula: Let us look at what a difference this wrong AG does to the Yagi in the G/T tables. See full list on leanpub. Will keep you. Gain, VSWR, impedance, front to back ratio are the main requirements. Model 15LFA-JT Yagi Forward gain is not everything. 546 feet long or 6. 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. A design technique for wire antennas, based on the Structure-Based Evolutionary Programming, is used to design a broadband antenna with an end-fire radiation pattern and a very simple geometry, operating in the 3–16 GHz frequency band, namely, from the S band to the Ku band. I cannot figure out how to model a phase shifted antenna. Construction and 4nec2 Model of a 144 MHz Halo Antenna. com describing antennas for WLAN deployment. 4NEC2 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. YAG 306-06H. 4 GHz, you might look for quasi-yagi type, it is easier to design the feed network and it can be build on the PCB. If traditional antenna theory says that the impedance of a half wavelength dipole in free space is around 72 Ohms at resonance, and a model taking into account the wire diameter and the height about ground reports 65 Ohms, and the measured value is 61 Ohms, we can be more confident that we have built a form. YAG 340-48H. My Basket: Menu. 147 meters tall;. A shunt coil with Qi around 100, and L around 29uH will transform that to 50+jX. There are a few graphical interfaces available (4NEC2 is the most popular free one) but they are all pretty old. 8 dBi) gives much better range than 1/2 wavelength dipole (2. 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. Folded dipole fully insulated from boom Director/reflector diam =2. Zweidimensionale Inverted V liegen dann in der y/z-Ebene. 56 inches long. The NEC output included in this iteration include: the 4NEC2 calculation input / output page, feed impedance plots, a diagrammatic image of the radiated pattern at a distance of 1 kilometre, antenna current for an input power of 100 watts, vertical gain in dB and finally the loop's radiated vertical signal level at a distance of 1 kilometre also for an input of 100 watts. Furthermore, EZNEC in comparison to 4nec2 indicates that the antenna needs to be slightly longer, namely: 40. I cannot figure out how to model a phase shifted antenna. 5 GHz with acceptable bandwidth which has useful applications in communication systems. SIMULATION OF ANTENNAS The software used to model and simulates the antennas is 4NEC2. The goal for a wire model of an end-fed half-wave dipole antenna with no special simulator tricks (like EZNEC’s transformer function) is achieved. When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. 1m) by comparing the antenna to resonant dipoles of known gain with a receiving station that was at a 100 km distance. The basic idea of the G5RV is a balanced 80m half-wave resonant antenna with a section of high impedance line at the feed point to aid in matching the antenna to the rest of the coax transmission line to the source. Simulation this very large Array by building the model using EZNEC and computing it in 4nec2 using the nec2dxs11k kernel. Once you start with just a basic dipole, moving on to base-fed verticals, Yagis, quads and other geometrically complex antennas becomes much easier to model. Langdrahtantennen liegen entlang der x-Achse. Optimized for 144 - 145 MHz or 144-146 MHz and 432 - 434 MHz or 430 - 440 MHz. 4NEC2 TUTORIAL PDF - Antenna Modeling With 4NEC2. Coloured 3D Presentation 5. 3" driven element (folded dipole - 2" loop height), 69. 3 shows the first model used to simulate the antenna in 4Nec2. Of particular interest for members of this forum is that the 4NEC2 antenna models are provided for each of the more than 30 antenna studies that make up the "Bent Dipoles" site. Coupled Resonator Dipole 13 • Multiband 20-15-10 Sloped Delta Loop: model 22 (x 1,y 1,z 1) ~ 8ft 4nec2 settings 23. The default units in 4nec2 are meters. Es braucht schon eine gewisse Erfahrung um damit zu arbeiten und hinterher die gewonnenen Daten auf Plausibilität zu prüfen und auszuwerten. I'll fix it later with a GX card. After reading Tony’s write-up on his portable linked inverted V dipole ( April 2017 Nerg News) I was motivated to see if I could do a workable model for the antenna in a general purpose antenna modelling package, for me the best choice for this is 4nec2, it is free, and has many features even the paid for packages don’t offer. 698-894mhz, 1695-2360mhz hybrid double mimo twin beam panel antenna with integrated ret 8pin din male-8pin din female, 40. Working with the old 4NEC2 editor 5. Figure 3—The EZNEC wires page for the correct model of the 20-meter and 15-meter combined dipole antenna. Same time they demand optimizing the station for this purpose. Height is about 35ft maybe 40f. Ham Radio Antenna Digital Guns Ham Radio King Dipole Antenna Work Benches Projects To Try Weapons Guns. Versuche erstmal einen Dipol im freien Raum, später über Grund. Dipole Quadcopter Suburban Clutter 10' Vertical Dipole, 100 mW Beacon 5' Whip Figure 4 — Paths from various heights to a distant local station. The major difference is a traditional dipole has to be mounted at its center, or have the wire strung out from the center of both legs, whereas a j-pole has its connection and mount at the bottom. Use the 4NEC2_Generator. 147 meters tall;. Many Live-ATC sites are using this antenna to stream aviation transmissions to the Internet. 4NEC2 ist kein Spielzeug was man in 10 Minuten erlernen kann. Furthermore, EZNEC in comparison to 4nec2 indicates that the antenna needs to be slightly longer, namely: 40. In the above picture it is deployed as a horizontal dipole, with the 80 meter legs extended, and the 40 meter legs left coiled up. Of course you must keep the end of the antenna high enough above ground, such that humans and animals will not be harmed by the high voltage on the end of the wire. by Arie Voors 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. NEC Model Library The following files and links point to NEC/AO/YO models of various Ham antennas that I have simulated and/or tested over the past 30 years as an antenna designer. 546 feet long or 6. com h feedpoint x y z length = ½λ. 45-in is the Source segment size in the posted 4nec2 file with one continuous driven element. in "clear surroundings", in an inverted V and/or. You can also convert MMANA models to Nec-2 and back. The program can be used to model an antenna, and then determine through. I carried out tests and found tap positions which gave me resonance on 80m and 160m and so decided to fit a switch between these two tap positions (160m = 28 turns; 80m = 6 turns). When an antenna that is one half wave length long has RF energy applied to it at its resonant frequency a standing wave develops on it. frequency Impedance (real & imaginary) vs. Each line will be assigned a reference number, a number of segments, and a radius. Entering data in the 4NEC2 program The 4NEC2 program helps the designer to create and optimize its antennas. Height is about 35ft maybe 40f. Model 15LFA-JT Yagi Forward gain is not everything. 3) My models place antenna 2 meters above a ground. org/wiring. The BiQuad antenna is a simple 2. Può essere interfacciato a HFwin32. Typical driven element: a bit less than l/2. Cebik W4RNL's website on antennex. This is an easy antenna to build and the materials cost about $15-20. Since NEC-2 is most accurate when all wires are of the same diameter, and since physical models of transmission lines will have a velocity factor of 1, the physical model will always be only an approximation of the use of actual feedlines. So by using OHM’s law V = √(P x R) , if we feed the antenna with 1kW RF out and with the EFHW feed point impedance of 2. Pauls Projects. All unused splitter ports are terminated in 50 ohms. 5 7 10 12 12 12 14 15. You are using 4nec2, right? If you look back at GHZ24's model of the L shaped dipole he posted earlier in this thread on the AstroPlane you will see the same two "0" "0" at the feed point he uses in his 4nec2 program, so you too can use the feature. In some optimization cases, a constant dipole wire radius could be adopted in order to simplify the construction of the antenna. I built the model in 4NEC2 and ran some frequency sweeps using various parameter sets from published sources and some of my own. The script I wrote allows you to generate fractal antennas and model them in 4NEC2. When I opened my win7 laptop windows update I was originally going to put up an OCF dipole but since I have the room for a funny shaped 80m loop I figured that would be better. In the above picture it is deployed as a horizontal dipole, with the 80 meter legs extended, and the 40 meter legs left coiled up. 8 metres Xin = -0. 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. A 2dB increase going from the Fringe to Deep Fringe model does actually occur at the center point. Has anyone found or written one? I am building a 75 Ω fed OCFD and need to model the radiated patterns, but I have no data for 4nec to add a balun. 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. Many Live-ATC sites are using this antenna to stream aviation transmissions to the Internet. Underground antenna. My understanding is that a dipole antenna is in the shape of a T where the length of each horizontal branch is equal to a quarter wavelength. I tried to model a multiband yagi. 8 MHz makes a wavelength 1 meter I built the model in 4NEC2 and ran some frequency sweeps using various parameter sets from published sources and some of my own. 5mm at 76mm from the end second director length is 59mm at 125mm from the end. HRM_01_2m_EFHW_Dipole_Autotransformer_wo_CP. Files: 230-15H. Use 4nec2 (on PC) or CocoaNEC (on Mac OSX) to model the four element antenna array. YAG 320-16H. After reading Tony's write-up on his portable linked inverted V dipole ( April 2017 Nerg News) I was motivated to see if I could do a workable model for the antenna in a general purpose antenna modelling package, for me the best choice for this is 4nec2, it is free, and has many features even the paid for packages don't offer. 546 feet long or 6. I ran vertical radiation patterns from 100 Mhz to 1000 Mhz. ICNIRPcalc permette di calcolare le distanze di sicurezza delle antenne rispetto ai limiti. Creating an NEC file for a 2375MHz dipole There are several possibilities and they hide behind "Settings" in the 4NEC2 Menu. Once installed verify that you can read the help file Readme. 22 Aug Hello!. This way we all contribute to solving any left-over problems in 4nec2. Using an open-wire parallel feedline (commonly called “ladder line”) with an antenna tuner, it tunes up on the 10m band as a 5/8-wave loop as well. 07MHz) 1 fully extended Long Whip 1 RedCoil tapped 18 turns from Bottom 4 22" Dipole Arms 1 Versatee 1 TRSB,(2. 8 Ft Diameter of Beam: 21. The "Geometry" tab in the "4nec2 Edit" window is where you will define your antenna's structure. txt) for you to play with. Two antennas. The antenna complimented my "low-band" horizontal dipole nicely and gave me the most useful HF bands (20-10m) without needing an ATU. 4NEC2 is a NEC based antenna modeler and optimizer developed by Arie Voors. 15 MHz λ/2 = 300/freq/2 = 20. Langdrahtantennen liegen entlang der x-Achse. 4nec2\exe” folder, in your Word or Wordpad text editor. Wires with the same endpoints are joined together. 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). 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF Construction and 4nec2 Model of a 144 MHz Halo Antenna. The program can be used to model an antenna, and then determine through. May 5, 2016 - Homemade TV Antenna: This TV antenna is not only omnidirectional, but also compatible with the new digital television. The radiation characteristics and reflection coefficient of the proposed antenna were described and simulated using 4NEC2 software package. Premium quality anttennas for two bands. j'ai retiré du disque le mmana que j'utilisais avant. The goal for a wire model of an end-fed half-wave dipole antenna with no special simulator tricks (like EZNEC's transformer function) is achieved. YAG 312-10H. 4NEC2 TUTORIAL PDF - Antenna Modeling With 4NEC2. Therefore, the dipole can be strung between two high supports, which can be separated by less than one half wavelength at the lowest operating frequency. 360 degree reception - greatly improved reception versus internal or simple indoor dipole antennas. Each line will be assigned a reference number, a number of segments, and a radius. The (Continued on page 3) President’s Letter, Continued. 3042035 meters · Reflector/dipole spacing = 0. However, at 1090 MHz, I do not have the tools to compare the model to a real-world specimen. There's definitely a demand for a modern 3D CAD type frontend, if anyone's looking for a weekend project. 56 inches long. 45-in is the Source segment size in the posted 4nec2 file with one continuous driven element. A good question to ask is “is my 6m Yagi too low for sporadic E propagation on 6m?”. 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. 4nec2\exe” folder, in your Word or Wordpad text editor. 20 Meter Dipole at 20 feet. YAG 340-32H. Many Live-ATC sites are using this antenna to stream aviation transmissions to the Internet. logperiodic_opt. 14 Sep 4NEC2 is a freeware antenna simulation software program. The ends of the dipole can be "dropped" down from the horizontal, without much adverse effect. By Craig Weixelbaum. From comparison with previous modelling above very poor city ground, one may conclude that, at least at a height of 16. The position of the elements along the boom is a bit different: the dipole is much closer to the reflector. Keywords: cross dipole antenna, Koch curve, multiband antenna 1. It worked fine and I had fun with it so I decided to model an antenna like that. It’ll produce all the kinds of charts and graphs you’d expect to see from a full-featured modeling package. 5mm at 76mm from the end second director length is 59mm at 125mm from the end. The one I built wasn’t a folded dipole as it was too complicated. Vhf tv antenna. The goals of this A Beginner's. 60 dB for a proper model stacked per DL6WU formula: Let us look at what a difference this wrong AG does to the Yagi in the G/T tables. YAG 317-14M. 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF It will work better than that "Rubber Ducky" the radio came with! Construction and 4nec2 Model of a 50 MHz. unequal basis with a G/T of -0. 5" diameter FM loop. EDIT (3Sep2011): Used 4nec2 to analyze different Feedpoint Gap sizes in a Folded Dipole (L=27. nec' in the Intro Files download you can see edge currents on the groundplane (phase and amplitude). Shown here is an Inverted-L with its long leg sloping to the ground. yag 240-20h. Using the 4NEC2 Editor 5. 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF. When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. 4NEC2 ist kein Spielzeug was man in 10 Minuten erlernen kann. Click on the image to see a larger version. I am having a 'bear' of a time trying to model (correctly) 1/4 wave decoupling stubs for a folded dipole that I have created. yag 310-08m. yag 320-16m. I saw the plans for this on the internet (link to plans) by Allen Lowe (N0IMW). 15 wavelenghts away. First Test Station Details K6PZB Reference station, ground mounted half-wave vertical dipole, 1000 foot distant, LOS path in the same park as the transmitter. Has anyone found or written one? I am building a 75 Ω fed OCFD and need to model the radiated patterns, but I have no data for 4nec to add a balun. 6 meter, 2 element yagi. In some optimization cases, a constant dipole wire radius could be adopted in order to simplify the construction of the antenna. 75 m (55 ft), VSWR is hardly influenced by ground quality. 160M Is a Tough Band • Propagation quite variable, signals often not very strong, heavy QRN during the summer -Mostly a nightime band, varies a lot through the night -During the winter, 800 miles or. 4NEC2 TUTORIAL PDF - Antenna Modeling With 4NEC2. Exit and restart 4nec2. To simulate this antenna, 4nec2, FreeCAD, and HFSS were used. zip-- Dipole models. A 4nec2 model is also available. Simple example: 40m dipole Transfer antenna elements to spreadsheet (CocoaNEC) Rule of thumb: ≥10 segments per half-wavelength (should be odd) In the model, dipole is one long wire, not two (software inserts the source). Center: View Antenna display, showing the "wires" making up the model of the five-element beam, with currents and 2D slice superimposed to show orientation. They are one of the easiest to design. By Craig Weixelbaum. NEC based antenna modeler and optimizer. 14 Sep 4NEC2 is a freeware antenna simulation software program. From comparison with previous modelling above very poor city ground, one may conclude that, at least at a height of 16. 15 logiciels de calcul ou de simulation : Antenna Solver, 4Nec2, Nec4win95vm, Wipl-D, MMana, Mininec classic, Necwinplus, Antenna Model, Eznec, Emmcap, Mmp-Max1. In model file "TrapDipole" I changed Z dim to 20 to simulate 20 meter height of wires, Geometry view shows wires above X-Y plane, and excitation in ce TrapDipole model question - 4nec2 forum 4nec2 forum. The script I wrote allows you to generate fractal antennas and model them in 4NEC2. I don't seem to be able to find the data to enter a 4:1 current balun in the 4nec2 software. Transmission line for the phasing sections (TL) The LazyH is symmetric vertically about the feed point, so lets exploit that by defining one dipole as a single GW element, and copying it. the dipoles, and dipole wire diameters. K1POO 4 Band Off Centre Fed Dipole (40-20-15-10m ) MMANA-GAL K1POO Antenna model’s 3D far field results The antenna at 8m height above real ground 5mS/m and dielectric 13, SWR ref 200Ω. YAG 312-10M. The one I built wasn’t a folded dipole as it was too complicated. Typical coils of copper tubing Question:We have some bent coils of 1/8-inch (3. I'll fix it later with a GX card. yag 312-10h. 4NEC2 doesn't have an easy way to produce a sequence of plots by frequency, so I just plugged in various frequencies and saved the plots. Classical Design Algorithm for LPDAs The most complete and practical design procedure for a log-periodic dipole array (LPDA) is that by Carrel. 8288 ft 14 AWG copper wire 52 feet above ground 4Nec2 Example Create the File 1. 8 Ft Diameter of Beam: 21. Fabricated and tested the final model, a three dipole electronically beam steerable wire antenna, at 446Mhz and a VSWR. In the above picture it is deployed as a horizontal dipole, with the 80 meter legs extended, and the 40 meter legs left coiled up. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and. layout of such a standard sort of model using a transmission line used with a di-pole. the dipoles, and dipole wire diameters. Is a Dipole better than a Cobweb Antenna? Ham Radio Aerials. Entering data in the 4NEC2 program The 4NEC2 program helps the designer to create and optimize its antennas. They have not been verified by the ARRL Lab. Based on your location, we recommend that you select:. Video Tutorial on Receiving ISS Astronaut Amateur Radio Conversations with. The directivity decreases when moving away from broadside towards lower elevations. The antenna I borrowed last year was a 2 element antenna based on a Log Periodic Dipole Array antenna. Table of Contents. When I opened my win7 laptop windows update I was originally going to put up an OCF dipole but since I have the room for a funny shaped 80m loop I figured that would be better. 4Nec2 offers an unbelievable suite of modeling tools and features: Super-high segment count, built-in detailed Smith Chart, Geometry designer, and ability to view many complex output. NEC Model Library The following files and links point to NEC/AO/YO models of various Ham antennas that I have simulated and/or tested over the past 30 years as an antenna designer. 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. The program can be used to model an antenna, and then determine through. 4Nec-2 is driving me nuts. Two antennas. I'm trying to model the concept, but I don't see in 4NEC how to model the shunt capacitors as part of the active antenna structure. The Big Gun (Optimization) Optimize (Tune) a 2 metre dipole to 6 metres Adjust reactance to zero Results L= 2. I will show a method that uses 4NEC2 to give you the information you need to converge on an optimum set of these variables. to an isotropic radiator and behave like a dipole. All transmission levels shown are nominal. 30 instead the correct -0. a slinky dipole antenna that covers almost all hf bands mede with a flexible 90 turn metal spring by n4spp. I understand that you have to account for the capacitance, inductance, and parallel resistance of such wire configurations when modeling them in 4NEC2?. The ground model used is "real/high accuracy" and simulates a heavy clay soil which is considered an average quality ground. The BiQuad antenna is a simple 2. I haven't looked closely at the model in all respects, but it seems to. 20 Meter Dipole at 20 feet. 14 Sep 4NEC2 is a freeware antenna simulation software program. Hence, the minor lobes are avoided and the directivity is increased. Diamond D130J (Icom AH7000) Discone Antenna (A Universal Discone 4nec2 Model) The Diamond D130J (also marketed as the Icom AH7000) is an ultra wide-band omnidirectional vertically polarized antenna designed to receive over the 25-1300 MHz frequency range. j'ai retiré du disque le mmana que j'utilisais avant. Dipole Antenna). The loop is also much quieter than a…. Cebik W4RNL's website on antennex. I don't seem to be able to find the data to enter a 4:1 current balun in the 4nec2 software. These fields are depicted by dashed lines in Figure 2. Presented to HOTARC. 8 metres Xin = -0. This gave a nice result with three sharp dips in SWR in the 10-15-20M center frequenc. A whole shank is 15-20 lbs, so I got just the shank end (that's the end closer to the foot, or trotter), about 8-9 lbs, conveniently boned out by the butcher. Working with the old 4NEC2 editor 5. GroundUrMast had to select a frequency to model the antenna; he picked 584 MHz in the middle of the UHF band. Use the 4NEC2_Generator. 4Nec-2 is driving me nuts. described and simulated using 4NEC2 software package. 4nec2\exe” folder, in your Word or Wordpad text editor. I used computer software 4nec2 (antenna modeler and optimizer) version 5. si c'est pour un simple dipole la demo va bien si c'est pour plus, gagnez du temps en ne telechargeant pas 4NEC2 va tres bien. Ham starts with the hind leg of a pig. The since the distance of a wavelength in the above graph (thanks W7EL) is 100 meters, we can also considered the bottom scale as a percentage of a wavelength. can anyone here model the baluns for me so i can use them on 4nec2 please. I get 35 channels and I an a long way from any large city. The BiQuad antenna is a simple 2. in "clear surroundings", in an inverted V and/or. py code to render the antennas. Each dipole is 32" wide. Assuming you are in HF/VHF. For an inverted-VEE or sagging dipole, use two wires and a third, short wire in the center for the feedpoint. Wilson Drive 4G-X is the most powerful 4G vehicle booster sold. 147 meters tall;. A 4NEC model (more detail later) of the 40m Dipole is shown below with exact dimensions/approximate orientation to the antenna placed in my backyard including insulated wire with the type and thickness of THHN wire 14 gauge. Now the aviation band extends from 118 – 136 MHz but a dipole can only be optimised for one frequency. They are one of the easiest to design. The picture on the right above shows an OCF Dipole with the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. 3270188 meters · Director length = 0. Have a look at the 'Introduction to Phased Array Design' section on my website, there is a 4NEC2 model of a 6x1 element array on a finite groundplane. The "MP" files are included in the 4NEC2 package and are automatically included during installat-ion. These files have been contributed by various sources. 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. Sonst funktioniert die Koordinatentransformation von 4NEC2 nach Wattwächter nicht. Assuming you are in HF/VHF. Note: this Split feature can only be used with two wire connections. I modelled it in 4nec2 and found it looked viable for the HF bands. yag 240-20h. 4NEC2 is a freeware antenna simulation software program. As seen on his page, the original formula seems to come from an article by J. The wires of the model are numbered as shown in the table 1. Verify DirectX is version 8. Amateur Mobile Antennas The Shark single band antenna represent an economical solution to mobile HF operation. The goals of this A Beginner's. By Craig Weixelbaum. The resulting gains and VSWR are plotted over the frequency range of interest. If traditional antenna theory says that the impedance of a half wavelength dipole in free space is around 72 Ohms at resonance, and a model taking into account the wire diameter and the height about ground reports 65 Ohms, and the measured value is 61 Ohms, we can be more confident that we have built a form. YAG 315-12H. I understand that you have to account for the capacitance, inductance, and parallel resistance of such wire configurations when modeling them in 4NEC2? If anyone can explain the derivation of using RG-58A/U as a. The NEC output included in this iteration include: the 4NEC2 calculation input / output page, feed impedance plots, a diagrammatic image of the radiated pattern at a distance of 1 kilometre, antenna current for an input power of 100 watts, vertical gain in dB and finally the loop's radiated vertical signal level at a distance of 1 kilometre also for an input of 100 watts. Sonst funktioniert die Koordinatentransformation von 4NEC2 nach Wattwächter nicht. What is the directivity of the resulting array in dBi? ii. A theoretical model for approximate evaluation of CIE chromaticity coordinates from the Judd-Ofelt intensity parameters has been presented. HRM_01_2m_EFHW_Dipole_Autotransformer_wo_CP. Removing the load, and running the model gives a feedpoint Z of 16-j500. Voici un exemple pratique d'utilisation du logiciel de simulation 4nec2 pour la mise au point et l'étude d'une antenne NVIS de type demi-dipôle. yag 317-14h. Optimizer gets trapped. Does the A. AutoEZ: Change History and Update Instructions Latest revision: v. Presented at ARRL Pacificon Antenna Seminar October 18-20, 2019 Steve Stearns, K6OIK [updated 10/25/2019] ABSTRACT: The dipole is the most basic of antennas. to a middle of a segment, so to model a dipole a single wire consisting of an odd number of segments is used and the source location will always be at the geometrical center of the wire. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and. The dipole was too close to corner. The radiation pattern of the DF9CY yagi:. The goals of this A Beginner's. 6 Meter Aluminum Dipole Antenna Parts list: The 6 meter dipole uses the same parts as the 10 meter model, less the 6-foot length of. The vertical scale is exaggerated. 8 metres Xin = -0. Use 4NEC2 AutoSegment utility. 2 Meter Vertical Dipole Antenna by Jim Feldman - W6JMF It will work better than that "Rubber Ducky" the radio came with! Construction and 4nec2 Model of a 50 MHz. YAG 315-12H. Other recommended sources for NEC related informations are the Nec-2 and Nec-4 user-manuals and. The dipole wire is one end of the line, while a new short 1-segment line ter-minates the transmission line. files: dipole. Aviation fans prefer this antenna as it works well picking up both land based and airborne transmitters. 21 Nov Appendix B – NEC User Manual Installation. yag 320-16h. Run the simulation and review results 5. This is a 3rd. 15 logiciels de calcul ou de simulation : Antenna Solver, 4Nec2, Nec4win95vm, Wipl-D, MMana, Mininec classic, Necwinplus, Antenna Model, Eznec, Emmcap, Mmp-Max1. Wilson Drive 4G-X is the most powerful 4G vehicle booster sold. In the above picture it is deployed as a horizontal dipole, with the 80 meter legs extended, and the 40 meter legs left coiled up. yag 320-16m. A simple test for NEC2 impedance estimates would be to construct a folded dipole model for NEC2 - vary the diameter of the top element and check the results against the standard formula for dipoles with unequal diameters. 5 mm/100 kHz of of each end of the elements. Files: 230-15H. I tried to model a multiband yagi. It can be used to calculate and plot Gain, Front to. Dipole Antenna). com describing antennas for WLAN deployment. Near Field Simulation 5. 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. ½ WAVELENGTH DIPOLE ANTENNA mobilefish. I think you will find that there is a variance between the two methods. files: 230-15h. txt appended (you’ll need to remove. 4Nec2 has a great editor for defining your antenna model parameters (actually several editors) and a geometry display window that updates as you build your model (so you can see whether you’ve made any obvious mistakes). I rescaled the values for low part of band 3 and simulated (with 4nec2) the result. Note that the small dipole used in this work is smaller than the 1/50th of the wavelength so the 4NEC2 work should be comparable to the analytical work. Loop-Antennen liegen in der x/z-Ebene. The above figure shows the radiation pattern for normal mode of radiation in helical antenna. L2 C2 C1 C1 = 38pF C2 = 100 pF L2 = 3. YAG 320-16H. Each line will be assigned a reference number, a number of segments, and a radius. I did not model the required 4:1 (impedance) balun. A 4nec2 model is also available. QRO use is acceptable too. Dipole tv antenna. Gx developer tutorial. 8 dBi) gives much better range than 1/2 wavelength dipole (2. Also the impedance at the feed point of a dipole at resonance is around 73 ohms. 4NEC2 TUTORIAL PDF - 21 Nov Appendix B - NEC User Manual Installation. Contribute to wspeirs/antenna_models development by creating an account on GitHub. Removing the load, and running the model gives a feedpoint Z of 16-j500. described and simulated using 4NEC2 software package. 160m low dipole; 7 MHz / 40m. Here is the 4nec2 model file with. See full list on leanpub. A 4NEC model (more detail later) of the 40m Dipole is shown below with exact dimensions/approximate orientation to the antenna placed in my backyard including insulated wire with the type and thickness of THHN wire 14 gauge. nec' in the Intro Files download you can see edge currents on the groundplane (phase and amplitude). Include your state for easier searchability. I'm trying to model the concept, but I don't see in 4NEC how to model the shunt capacitors as part of the active antenna structure. 160m low dipole; 7 MHz / 40m. 5 is the normal half-wave dipole with the expected impedance of about 72 Ω. the dipole elements. Jul 28, 2019 - The airband J-Pole antenna is tuned for the 118 – 128 MHz aircraft aviation band. For 3D patterns with a 1 degree step size enter a value of 130682 or greater in the small 4nec2 prompt. Some are based on look-up tables, some completely hide their algorithms. 200 MHz CM Vertical orientation CE SY L=4. Radio Shop Ham Radio Operator Doomsday Preppers Ham Radio Antenna Ham Bone All Band. By Craig Weixelbaum. Figure 5—The NEC-Win Plus wires. Many Live-ATC sites are using this antenna to stream aviation transmissions to the Internet. that of the OCF vertical dipole at 0°. Adding Ground Underneath the Dipole. 4nec2 is a free package (Google search) which comes with the free (and 30 year old) NEC2 calculation engine. You can get this program from www. 2 dBi "Moxon rectangle" for 50. I can use two separate sources, but then the program only recogn. If this was antenna for HF, I have the tools to do that. I understand that everyone else in the world uses Metric, You can convert these … Continue reading "Open Stub J-Pole Project – Completed (Many times)". 2 Uniform Circular Array of Discone antennas 62 5. You can get this program from www. 75 m (55 ft), VSWR is hardly influenced by ground quality. to an isotropic radiator and behave like a dipole. But to be sure, I'd like to model this up as per the design, and then increase the thickness and see the result. Enter a brief summary of what you are selling. May 5, 2016 - Homemade TV Antenna: This TV antenna is not only omnidirectional, but also compatible with the new digital television. 4NEC2 TUTORIAL PDF - 21 Nov Appendix B - NEC User Manual Installation. The QSL bent dipoles website is an antenna modeling "tour de force" about the many ways a center-fed dipole can be bent to fit available space. 546 feet long or 6. 6 Meter Aluminum Dipole Antenna Parts list: The 6 meter dipole uses the same parts as the 10 meter model, less the 6-foot length of. Sep 10, 2017 - Are you looking for a UHF omni antenna with a little more gain? Our UHF Slim Jim Antenna delivers up to 6dbi of gain on the 440 - 470 Mhz UHF bands, which is almost twice the gain of a J-Pole and 5 times the gain of a 1/4 wave ground-plane antenna. Presented to HOTARC. I carried out tests and found tap positions which gave me resonance on 80m and 160m and so decided to fit a switch between these two tap positions (160m = 28 turns; 80m = 6 turns). Dual-Banding your 40m vertical for 15m. When running frequency sweeps, linear or logarithmic style SWR, Gain, F/B-ratio and impedance line-charts are produced. expression found in part (g) show consistency with the beam pattern plot produced by NEC? Discuss. Video Tutorial on Receiving ISS Astronaut Amateur Radio Conversations with.