Ground plan element dimensions for various local australian and some international amateur radio bands with 4nec2 an nec based antenna modelling and optimizing computer application the proposed 14. Download software 14 wave antenna with ground plane. Note that the quality of the other half of the antennathe conductive ground plane beneath itmakes a big difference in both the efficiency and feedpoint impedance of the antenna. Whips mounted on vehicles use the metal skin of the vehicle as a ground plane. It contains many calculators to help you design radios and antennas for all your. Helical antennas invented by john kraus give a circular polarized wave. Choose from quarterwave, halfwave, the powerful 58wave, 34wave, or fullwave, and calculate minimum lengths of required radials, and then shop for your needs on our other pages and select from our inventory of aluminum, fiberglass, wire, coax, connectors, and other parts and. Pay no attention to the wire goingoff horizontally from the base. Having looked at dipole antennas, it is apparent that the antenna currents are symmetric about the center of the antenna. Download the ground plane dipoleinverted v calculator by n2imf. The vertical element and radials are 332 or 116inch brass welding rod. The normal quarter wave ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding. The half wave antenna mounted 1 foot above ground shows only 1. A ground plane antenna project for 10 meters band by n4zaw.
It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. A ground plane antenna is essentially one half of a dipole mounted vertically. This link is listed in our web site directory since sunday jan 22 2017, and till today ground plane antenna calculator has been followed for a total of 816 times. In other words, if you divide the antenna at the center feed point, the 2 halves of the antenna look like mirror images of each other. The middle of a halfwave dipole is electrically neutral meaning there is no rf voltage present so the outer conductor of the coax cable can be connected directly. A shortened multiband endfed half wave efhw antenna. This is true with a quarter wave antenna, which needs an extensive ground plane. Half wave dipole calculator is used to calculate wavelength,radius,length of the dipole antenna. Courtesy of and designed by n2imf joseph r mielko this downloadable calculator will provide you with good starting measurements for a basic ground plane, inverted v or standard dipole antenna. Antenna length calculator build a dipole inside antenna and receive all the fm stations on your stereo unit, loud and clear. Download software 14 wave antenna with ground plane windows and linux version. Building and experimenting with antennas can be an interesting part of the radio hobby.
If it is inside, just attach it to the wall where your receiver is located. The estimated gain of a vhfuhf discone antenna example in. This could be 50 ohm types such as rg58, rg8x, rg8, rg2, or 75 ohm type such as rg11, rg59, rg6 or even 75 ohm twin lead. Without an earth the antenna will try and use the coax as the return path. Fully extended, the antenna is 42 inches long but it collapses down for storage figure 2. There are usually four radials, three being a minimum, but you could use up to six.
This calculator is designed to give the vertical length height of a quarter wave ground plane antenna, and the length of each of the four radials often called radiators for the frequency chosen. Figure 19 ground mounted vertical half wave length antenna the graph below fig. The ground plane is assumed to be perfectly electrically conducting pec. Use this online slim jim antenna design calculator to find the actual wavelength, overall length, half wave radiator section, quarter wave radiation section, feed point, gap and spacing of slim jim antenna by. Its just one end of my g5rv dipole, or sometimes called a dummy load sorry just an old ham joke, hi hi. Magnetic loop antenna calculator spreadsheet excel spreadsheet that help. More compact versions were later designed with better swr bandwidth. Three of the most common vertically polarized omnidirectional antennas are the half wavelength dipole, the quarter wavelength ground plane, and the collinear array. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. The results are conveniently displayed in inches, centimeters, feet and meters. This formula takes into consideration the capacitive endeffect from insulators which shortens the physical length requirement for the equivalent electrical length. This calculator will help you to calculate the different wavelength of.
A quarter wave vertical antenna working against a perfect infinite ground will have a gain of 5. In telecommunication, a ground plane is a flat or nearly flat horizontal conducting surface that serves as part of an antenna, to reflect the radio waves from the other antenna elements. The closer the antenna is to ground, the closer the source and image become, and more pronounced the null along the ground. The measurements below are for building a simple dipole antenna. You can further reduce the height of the antenna by placing a capacitance hat at the top. Antenna projects for 144 mhz category is a curation of 148 web resources on, the tiny 3, magnetic loop for the 2m band, feed line dipole for 2 meters. The standard ground plane antenna consists of a vertical radiator which is insulated and centered between 4 horizontal surrounding radials which extend out from the base of the antenna. Use 75 or 50 ohm cable to feed the centre of the dipole. The 58th wave is a great antenna misunderstanding example. Dipole and inverted v antenna calculator enter the resonant frequency for the. This article will briefly discuss all three in the context of wifi communications in the 2. For a situation where the signals of interest are below the antenna in elevation e.
The best way to resolve this is to fit a choke, such as 10 turns of rg2 on a four. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. The amountsize of the groundplane required for the optimal performance of a monopole antenna is determined by the frequency you are transmittingreceiving at. If you would rather calculate the length of a fullsize vertical antenna, see the quarterwave vertical antenna calculator. A single radiating element approximately 14 wavelength long. Everywhere we look, everything tells us the 58th wave has 3db gain. Amateur quarter wave ground plane antenna calculator.
Hi i made a 14 groundplane antenna for use with my baofeng gmrsv1. The concept of a ground plane is roughly to build a antenna half as long as a normal selfcontained one, then add a mirror so that it looks like a complete antenna from the antenna side of the mirror. The earth ground below the antenna, a conducting surface a. Pdf design of a 600 mhz dipole antenna researchgate. To help explain this, i have drawn above what happens to the voltage on a half. However, monopoles can be smaller than dipoles, since they can utilize a pcb ground plane or metal chassis as the other half of the antenna without compromising performance. This calculator was adapted from the coilshortened dipole antenna calculator. Enter the frequency in mhz and click calculate it will give you the length for the radiating element as well as the ground plane elements. This calculator can be used to design a quarter wave ground plane antenna, with radials. A halfwave antenna for your 2 meter handheld radio ham. The antenna can be located outside, or inside the home. This calculator will help you to calculate the different wavelength of antennas based on the frequency. Does mounting a ground plane antenna upside down change.
With the efhw the earth or a counterpoise is still important, but not quite as crucial. About ground plane antenna calculator the resource is currently listed in in a single category. The main category is antenna design calculators that is about antenna design calculators. Ground plane antenna calculator resource detail the. The term monopole is also used to describe this antenna. This does not take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Requiring a new 2 metre band antenna for local fm simplex and repeater communication and after evaluated a couple of the main contenders for the project i settled on the 5. High performance 40 meters vertical without radials.
Whats the difference between a dipole and a ground plane. Maple leaf communications antenna calculator vertical. The marconi antenna is half the length of a dipole antenna. The chicken wire wonder a unique broadband vertical antenna for the hf bands ill bet youve never seen a tapered area small helix tash antenna. Enter the formula for the antenna calculation normally 234f. Marconi or groundplane vertical antenna the quarterwavelength vertical antenna, also called a marconi antenna is widely used.
Download the ground planedipoleinverted v calculator by n2imf. The computer shows a ground plane antenna mounted 1 foot above ground has a gain of 2. It is similar in operation to a vertically mounted dipole antenna. A typical gain pattern for a quarter wave ground plane antenna is. I wanted high efficiency 40 meter antenna with lowangle radiation. The distance between one point to another adjacent point in a wave is known as the wavelength. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. Amateur radio toolkit is the best app for ham radio hobbyists.
This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen. A basic antenna like a dipole is selfcontained and requires no ground plane. Online calculator for logarithmic periodic dipole antenna lpda. Amateur radio toolkit for android free download and. Again, because it is a half wave antenna, it does not need a ground plane. Each radial is evenly spaced 90 degrees from each other around the vertical element. Halfwave dipole antenna real ground simlation youtube. Hi all, i would like to know the antenna gain for monopole, some article post it as 2. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. The g0kya efhw an endfed half wave monoband hf antenna, plus two multiband versions new.
A 12 wave antenna isnt dependent on a good ground, it isnt as prone to lose power in a poor ground situation. This page can be used to calculate the element and radial lengths for a 14 wave ground plane antenna. A dipole antenna most commonly refers to a halfwavelength. The plane does not necessarily have to be connected to ground. Calculator fm frequency modulated antenna to bring in the stations loud and clear. My understanding is that when building or installing an antenna designed to operate over a ground plane e. This shortened easytobuild vertical, with noradials, is made from surplus military camouflage poles. Choose from quarter wave, half wave, the powerful 58 wave, 34 wave, or full wave, and calculate minimum lengths of required radials, and then shop for your needs on our other pages and select from our inventory of aluminum, fiberglass, wire, coax, connectors, and other parts and. Find a tube with a circumference equal to one wavelength, and wrap wire in a helix spaced a quarter wavelength.
A ground plane antenna by definition gives you a ground plane, but still, if you antenna has a good ground plane there should be only marginal deferences. The broken lines in figure 1 show compliance distances for vertical vhf quarterwave monopolesgroundplanes and mobile whips. Here we have collected some links to building instructions for 11m antennas on the internet. Dipole, inverted v and ground plane antenna calculators. Ideally for radials you should have them sloped downward at a 45 degree angle to help provide a. It is the most effective antenna when compared to other ground plane antennas. In this video i go through the build of a uhf vhf 146 mhz quarter wave ground plane antenna that can be used for repeater communications.
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