Despite all the words and diagrams in handbooks over the years, newcomers still send me questions about the antenna. This project commenced after paul g4apl read peter dodds g3ldo multiband dipole published in the march 2011 page 31 radio society of great britain rsgbmonthly magazine radio communication radcom as there was a requirement for a multiband aerial to be used on his gb7cip hf pactor links to be configured to cover the 7, 14, 18. Wire antenna calculator amateur radio station ws6x. When fed with open wire type feed, it becomes a multiband antenna using a tuner. This link is listed in our web site directory since sunday dec 21 2014, and till today multiband dipole has been followed for a total of 1193 times. The antenna consists of a regular 40 meter dipole using a. Lets see some antenna calculator and antenna design software that will help you design faster and better. The main category is fan dipole antenna projects that is about fandipole is a multiband wire antenna. Through these software, you can design various types of antennas like yagi, jpole, parabolic, quagi, super scanner, etc. Simply cut two equal lengths of stranded copper wire.
I am sharing here the thought process and experimentation that i went through to arrive at the solution that best fits my needs. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. This app is intended for aiding in the design of simple wire dipole antennas for 1 30 mhz. The allband doublet horizontal wire antenna has a history almost as long as amateur radio itself. Rating is available when the video has been rented. The measurements below are for building a simple dipole antenna. Ladder line, and to a certain extent twinlead, are much less lossy transmission lines than coax. Dx engineering multiband dipole antennas are designs that are rugged, yet lightweight. This app does nothing more than the standard 468freq mhz type calculations. On even harmonic bands, it appears as a nearly dead short. Build an hf ham radio dipole antenna it is easy to build, construct and erect a dipole antenna for the hf bands. Hf dipole antenna this antenna software will help you design a simple wire dipole. Please post a comment if you know other great software or links with information about antenna calculator and design programs. If you want to put this thing outdoors, do not use brass, as it.
If you have a longer garden, you can move the pigtail join further back the return wire. But, a linearly loaded dipole just might fit in your available space. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. To be combined with a yagi uda antenna or used as is. For example, if i make a dipole for the 2 meter band from 34 copper pipe, the fractional bandwidth goes up to 15% on account of the much smaller wavelength and the much thicker wire.
About hf linked dipole antenna calculator the resource is currently listed in in 2 categories. This is the length of a standard dipole but instead of dividing the result in half, use a 3664% offset to determine the feedpoint. Older cut and try method here is a fairly simple and easy to build multi band horizontal fan type dipole that can be constructed for all band operation from 160 meters up thru 6 meters or even higher. Folded dipole antenna input impedance calculator, 4512, 75. This online calculator can be used to find the length of the dipole antenna. Calculate safety distance from your antenna icnirp is a calculator software that allows you to determ safety distances for many know amateur radio antennas.
Coaxial trap design free software, by tony field, ve6yp. Antenna, ve3sqb ham radio antenna design software programs. An attic coaxialcable trap dipole for 10, 15, 20, 30, 40. Even zip cord such as what is used for lamp cords will perform quite well. Figure 1 shows radiation patterns of an 80meter dipole operated at the centers of the 80, 30 and 20. About multiband dipole the resource is currently listed in in a single category.
This software can not only be used to design but also to find out antenna gain, stacking distance, and standing wave ratio swr. Each antenna design software is slightly different from each other as each software design some specific types of antenna. Next would be a fan dipole with wires for each band. Do not try to add 6 meters to the multiband hf dipole. Each wire has one end connected to antenna and the other end is left free. A useful microwave antenna calculator the antenna calculator is a very simple and easy piece of software. The following program will calculate the lengths needed to construct several popular wire antennas. I used this package as part of the design and construction of my traps.
Wire antenna calculator amateur radio ham radio station ws6x. Yagi calculator is a free antenna design and analysis software for windows. Amateur radio document library, antennas, schematics, homebrewing, connections. Download hf dipole calculator 12 wave wire dipole antenna. The main category is fan dipole antenna projects that is about fan dipole is a multiband wire antenna. Building a multiband hf dipole antenna dipole antenna, ham.
I only use rg8x coax to enter the radio room and to connect to a tuner. The problem with multiband hf antennas and coax is loss, the only way we can the full bandwidth on each band with a low swr is with a cage dipole, so the plan was to see if we can get a multiband cage dipole built in a fan or parallel configuration. The folded dipole is only useable with reasonable feed efficiency on the fundamental and on odd harmonics. I would like to build such a unit and have many designs in mine, but would appreciate your inputs. The folded dipole is much worse than a regular ladder line fed dipole dipole for harmonic or outofband operation. Dipole, inverted v and ground plane antenna calculators. Millsian software, built on a new classical approach to solving atoms and molecules, is a molecular modeling tool targeting pharmaceutical, biotechnology, and chemical researchers according to millsian theory, electrons are localized in molecules to functional groups that act as building blocks, or independent units. Apr 20, 2020 this is a simple dipole built for twoband operation that i made for portable use with my 20 and 40 meter qrp rigs. Figure 1 shows radiation patterns of an 80meter dipole operated at the centers of the 80, 30 and 20meter bands. This configuration, known as a doublet, will work well as a multiband antenna. These are going to be the two halves of your dipole antenna. The correct lengths for the various models will be displayed in the chart.
All you have to do is run the program and input your design frequency in the white window top. The overall length of my 40m version is 12m 40ft for the 40m band. Building a multiband hf dipole antenna dipole antenna. The free end of each wires are pointed towards opposite direction of the other free end. This antenna may be fed with ladder line and an antenna tuner with balanced connections. All parts used for the construction of the dipole can be used to construct the half square, so there is. Using this software, you can design and build your own yagi antenna. Antenna calculator length of the dipole antenna calculation.
Building a multiband yagi lee jennings amateur radio zl2al. This project commenced after paul g4apl read peter dodds g3ldo multiband dipole published in the march 2011 page 31 radio society of great britain rsgbmonthly magazine radio communication radcom. Here is a list of best free antenna design software for windows. Millsian software, built on a new classical approach to solving atoms and molecules, is a molecular modeling tool targeting pharmaceutical, biotechnology, and chemical researchers. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. The coaxial dipole or bazooka is the best keep secret. Not only can this type of dipole be used horizontally, you can also use it in an invertedv or sloper formation perhaps as an 80m160m version.
Various discussions centered around we should do this with a calculator and one was soon on the table with much head scratching etc. Program good for 1 500 mhz, although intended for mf hf. Multiband fan dipole click for a larger image and more details. Multiband dipole i built a multiband dipole that will work and 10 meters for ham radio. The help documentation contains complete diagrams and explanations. Using a tuner, they are usable to 30 mhz and come complete with the wire elements, ladder feedline, center t support, and end mount brackets. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. The performance is still good, so ideal if you have a small garden or want to try experimenting with bits of wire.
Qro notuner multiband dipole matt roberts mattatkk5jydotnet updated. The main category is dipole antenna that is about dipole antennas plans. The loaded dipole v2 is not as good as a full size antenna but it can be used in limited spaces and even indoors. You can also enjoy multiband performance without traps, coils, fans or other schemes. 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.
For many ham radio operators, it is not feasible to put up a a full length dipole on hf. This calculator is designed to give the horizontal length of a particular dipole including tees antenna, or one side of it, for the frequency chosen. Your station has specific requirements that may not match mine. It will be difficult to get to resonance, will not have good band width, and you can make a much more efficient 6 meter dipole as a stand alone. Multiband antennas category is a curation of 145 web resources on, the n3ujj antenna project, w8jk modified array, classic multiband dipole. Referring to your article on building a multiband yagi, you mention a matching unit with a vacuum variable that would match almost anything did you ever write up anything on this unit or do you have a reference that you could point me to. A ham radio antenna project with plans, pictures and parts list to help you build a fan dipole. Which is better single band or multiple band dipole antenna. Made out of coax, it matches closely to 50 ohms and can be set up horizontally or in an inverted v. I struggled to break the pileups with a small mast and trap dipole and decided to build a 35 foot telescoping mast with a small yagi on top.
This link is listed in our web site directory since thursday jun 23 2016, and till today hf linked dipole antenna calculator has been followed for a total of 1468 times. This calculator provides quick estimation of antenna size required for a given gain and frequency. If you have a tuner seem to recall you do, and the coax run is say less than 30 or so feet of rg2 or similar 12 coax, then you can get away with not having a wire for each band and using the tuner without severe losses. In the drawing above, it is shown for just four bands, 80 thru 10. The results are conveniently displayed in inches, centimeters, feet and meters. It is very broadband for a dipole and makes a great field day antenna. This calculator provides quick estimation of antenna size.
The list will grow with your help so lets start and share the knowledge. The bandwidth is actually quite sensitive to the conductor radius. This dipole antenna gives the same gain as all other dipoles, however, the half square is a much better dx antenna for a given elevation and may be worth the extra effort. A thicker dipole relative to wavelength will have more bandwidth than a thinner one. A more efficient version would be to feed a linearloaded dipole short ham antenna directly with 450 ohm ladder line or 300 ohm twinlead. Enter the desired frequency and select the desired calculation from the drop box. Effective jan 2016 i will be changing web hosting providers and as such a complete redesign of my website using a content management systemcms to better design and host the site.
All parts used for the construction of the dipole can be used to construct the half square, so there is no loss in investment if you decide to switch. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. Hf dipole antenna design software electronic circuits. A linearly loaded dipole, as illustrated below is about 3035% shorter than a classic halfwave dipole at the same frequency of resonance. This calculator uses a k multiplying factor value of. Calculations for the wire lengths can build a multiband hf fan dipole. Use 75 or 50 ohm cable to feed the centre of the dipole. A simple multiband dipole may be constructed for the lowest band on which operation is desired, but the overall length of the dipole antenna should be a shortened half wavelength as shown in table 1. This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen. Total wavelength refers to a single wire dipole in freespace and is theoretical. A handy calculator program that provides all dimensions and information on constructing a coaxial trap. This is a simple dipole built for twoband operation that i made for portable use with my 20 and 40 meter qrp rigs. Hf linked dipole antenna calculator resource detail. As i work mostly qrp, i need to minimize rf losses as much as possible.
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