Amateur radio document library, antennas, schematics, homebrewing, connections. A 160 meter antenna for small lot iw5edi simone hamradio. The sloper antenna explained with a twist ham radio secrets. Folded dipole antenna input impedance calculator, 4512, 75. This formula takes into consideration the capacitive endeffect from insulators which shortens the physical length requirement for the equivalent electrical length. What is the best direction to point a sloper antenna for. Dipole antenna calculator software free download dipole. Getting a big dx signal on 16010 m from one small, low. The measurements below are for building a simple dipole antenna.
Ive noticed 160m, and tried various things to make my wire antenna off center fed dipole, which works 8010, load on 160, to no avail. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Once settling on 4nec2 as the modeling software, i started fiddling with the new antenna itself. The fabulous dipole ham radios most versatile antenna. The loaded dipole v2 is not as good as a full size antenna but it can be used in limited spaces and even indoors. Wire antenna calculator amateur radio station ws6x.
If only one half of it is used it becomes a half sloper. A dipole for the 40 meter band sloping down from a 48 foot tower or from the roof of a three story building will require that the other support post say 8 feet tall be located at least 53 feet away from the tower. The drawback is that you need more horizontal space. This dipole was built to replace my singleband 40m linearloaded dipole. Sloper antenna category is a curation of 17 web resources on, the 15 meters half sloper, arrl sloper antenna, ik4dcs 80160 mt sloper antennas. All you need to do is enter the desired resonant center frequency in the form below, then click calculate.
Folded dipole sloper dipole g5rv coaxial dipole two band, single feed dipole inverted l dipole. Calculate safety distance from your antenna icnirp is a calculator software that allows you to determ safety distances for many know amateur radio antennas. The antenna would slope into my back yard and be unnoticeable from the street. This calculator provides quick estimation of antenna size. Figure 1 sumarizes the changes in % radiation efficiency and dbi gain as dipole slope goes from 0 vertical to 90 horizontal. Also, explore hundreds of other calculators addressing math, finance, health, fitness, and more. Using the software at the bottom of this page, i worked out that a 36cm length of wire. Designed for limited spaced applications and ruggedly built for many years of service. The correct lengths for the various models will be displayed in the chart.
The coaxial dipole or bazooka is the best keep secret. Download hf dipole calculator 12 wave wire dipole antenna. Log periodic antenna design calculates the dimensions and spacings of the elements needed to build a log periodic antenna, given tao. While horizontal dipoles required two large support masts, this antenna type only needs one large mast. A reducedsize half sloper for 160 meters heres a limitedspace antenna that will put you on the top band. The formula for calculating the approximate length of a dipole is. This is just a sloping half wave dipole, also sometimes called full sloper, half wave sloper, or just sloper. Even zip cord such as what is used for lamp cords will perform quite well. Dipole, inverted v and ground plane antenna calculators. This calculator uses a k multiplying factor value of. 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. Sloper antenna for both 40 and 15m bands cut into tower guy wire.
This is a common antenna configuration in the world of amateur radio referred to as a sloper or more accurately, halfwave sloper. I really didnt expect much directivity from the sloping dipole, but the direction was convenient from an aesthetic point of view. The classic sloper antenna is a topfed 14 wave vertical antenna sloping down and away from a tower. It is very broadband for a dipole and makes a great field day antenna. What is the best direction to point a sloper antenna for dx. Ver2calwireantenna actuallyaver2callyorientated resonate12wave dipole with theearthbeingthe return half duetopoorground conduc2vitya. Getting a big dx signal on 16010 m from one small, low antenna chuck counselman, w1his i live on a small lot in a dense, inner suburb of boston and cambridge. The western sloper had a slight gain advantage a bit more often on these because its grounding was in a somewhat wetter location. Hf dipole antenna this antenna software will help you design a simple wire dipole.
Made out of coax, it matches closely to 50 ohms and can be set up horizontally or in an inverted v. Wire antenna calculator amateur radio ham radio station ws6x. The list will grow with your help so lets start and share the knowledge. The design elements of a 160m half sloper are very simple. All you have to do is run the program and input your design frequency in the white window top left. The following program will calculate the lengths needed to construct several popular wire antennas. The slopers feed point is anchored high above ground. To support an antenna, i have no tower, and only two trees that arent too close to a house. Online and downloadable dipole, inverted v and ground plane calculators. Combines the tremendous dx firepower of the 14wave sloper with the wide bandwidth of the 12wave dipole. To help make a decision about using a sloped dipole sloper, you need to know. Sloper antenna for the 10m bands cut into towers south guy wire. We offer a variety of multiband and allband dipoles that provide great receiving performance with low swr. For each model run, the slope angle is set and the software optimization.
Antenna, ve3sqb ham radio antenna design software programs. According to the arrl antenna book 18 th addition there are two sloper design definitions a sloping. Such a problem can be solved by mounting a dipole at a slope. Amateur vertical antenna calculator this basic calculator is designed to give the aproximate length height of a particular vertical antenna, for the frequency and wavelength chosen. View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. Bsquare engineering is the first to offer a terminated folded dipole antenna, truly optimized for amateur radio use. Shop our selection of alpha delta wire antennas, including multiband sloper antennas for limitedspace applications and swl antennas for superior performance through 30 mhz. The results of antenna modeling of a halfwave dipole set at various angles. Antenna design calculators category is a curation of 83 web resources on, parallel square conductor transmission line calculator, analysis of antenna mast strength and bending stress, full wave loop antenna calculator. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. We have been building these antennas for over 19 years. 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.
The most widely used formula to calculate the approximate overall length of wire required for a dipole is. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. 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. In particular for low frequencies this antenna form is interesting.
Given an area where you could locate a sloper antenna with a tall mounting pole topendfeedpoint and the. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. Enter the desired frequency and select the desired calculation from the drop box. If you would rather calculate the length of a fullsize vertical antenna, see the quarterwave vertical antenna calculator. This free slope calculator solves for multiple parameters involving slope and the equation of a line. Program good for 1 500 mhz, although intended for mf hf. You can further reduce the height of the antenna by placing a capacitance hat at the top.
When i get my rig to do 20 and 40 meters, i most likely wont have enough space for a dipole unless i make a hamstick dipole, so i figure i could go with the sloper, since conditions where i am seem to be ideal for one. A useful microwave antenna calculator the antenna calculator is a very simple and easy piece of software. Building and tuning a dipole the easier way a faster way. My back fence is 50 ft from the rear of the house and not enough room on the property for 80 meter wire antenna must less a 160 meter one, and this to work great with the sloper wire attached to a fence, i also use monofilament nonconductive line like fishing or weed eater line. Some people put half slopers not half wave slopers on their tower.
The performance is still good, so ideal if you have a small garden or want to try experimenting with bits of wire. The slopers feed point is anchored high above ground near the top of the. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. If you have a longer garden, you can move the pigtail join further back the return wire. Determine antenna gain based on the slope of terrain. Test results for the sloper vs invertedv dipole on 8040 meters slopers are generally known to be good low angle dx antennas, while the invertedv dipole is generally known to respond to higher angle, regional type signals. This is particularly true at our fairly low 40 foot test height. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. Our best selling antenna is our 160 meter, ruggedized half sloper.
It is therefore widely used by radio amateurs with limited space. Delta loop antennas for 7 mhz delta loop and other wire antenna calculator. You decide, as an example, that you want to operate on the 20 meter band with your dipole, so you plug in the formula into your calculator and get started. After extensive testing, the power rating on the w8amz 80m reduced half sloper antenna has been increased to 1 kw ssb. You can imagine my surprise when elneci rbvealed that a parasitic element table 1. The 10m band sloper antenna is based on the experience of the 4015m band guy wire sloper that is attach to the same tower. 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. This calculator was adapted from the coilshortened dipole antenna calculator. Use 75 or 50 ohm cable to feed the centre of the dipole.
Installs like an invertedv with ground return accomplished thru. It accepts inputs of two known points, or one known point and the slope. You could also use it as a sloper or in an invertedv formation if you have limited space. A halfwavelength dipole antenna will give better results than the quarterwave single band sloper described above.
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