Electromagne2c wavepolariza2on electricandmagne2cwavesareat rightanglestoeachother magne2cwavedissipateswithina fewwavelengthsofantenna. You can further reduce the height of the antenna by placing a capacitance hat at the top. The antenna that most suited this application was a 40m band sloper as the guy wire to be used was slightly longer than a 14 wave length at 7 mhz and the top fed sloper was the most convenient installation having the least impact on the guy wire primary role. This calculator provides quick estimation of antenna size required for a given gain and frequency. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. Wire antenna calculator amateur radio station ws6x. Wintertime is the perfect time for exploring the top band. Technical concepts if you just want to build an antenna, skip ahead to the practical antennas discussion.
Verticals covers all the common types with a coil calculator built in for the antennas that require themthe quagi may be the best of two worlds. Program good for 1 500 mhz, although intended for mf hf useage. Dipole antenna length calculator dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Once the antenna system has been resonated, it may pay to experiment with the value of l and the length of transmis sion line between l and the transmitter. A 160 meter antenna for small lot iw5edi simone hamradio. This article reveals ways to avoid the major drawback. One of the reasons for this is that most designs are for qrp antennas and not made to handle more than 5 10 w of power. To support an antenna, i have no tower, and only two trees that arent too close to a house. Sources of reliable and useful information on homemade ham radio antennas. I hope the calculator helps you with the logistical part, and gets you thinking about the engineering part. In particular for low frequencies this antenna form is interesting. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Alpha delta hf swl sloper antennas dxswl free shipping on.
Vertical dipole and sloper in free space, over perfect or real ground sloper with several elements feeding sloper antennas multiband sloper w3dzz and double zepp as a sloper antenna multielement sloper antennas for multiband operation special types of halfwave sloper antennas and much more. By mark connelly, wa1ion hcdx mailing list, april 16, 2001. Fm antenna diy, ham radio antenna, diy electronics, electronics projects, radios, tv. May 6, 2018 the classic sloper antenna has its advantages and its drawbacks. After extensive testing, the power rating on the w8amz 80m reduced half sloper antenna has been increased to 1 kw ssb. A couple of months ago, i ran across a design rated at 100 w. View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. A 160 meter antenna for small lot posted in hf antennas 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 as. Multiple patterns can be superimposed on a single graph for comparison. Getting a big dx signal on 16010 m from one small, low antenna by chuck counselman, w1his yccc scuttlebutt april 2008 page 3 the photo is hard to understand, so heres a scale drawing. These fundamentals are supplemented by construction guidelines for directive antennas using a single element or several elements. It is therefore widely used by radio amateurs with limited space. All you need to do is enter the desired resonant center frequency in the form below, then click calculate.
Secondly, to perform for anything other than extremely local contacts on 160m, it would need to be a lot higher than twenty feet above ground. Hams have been using slopers for years because slopers offer some unique advantages not found in other antennas. The 10m band sloper antenna is based on the experience of the 4015m band guy wire sloper that is attach to the same tower. 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 as support for the pvc tubing on the top of my house.
For one, such a sloper is just an endfed wire which requires a great counterpoise or ground system to provide the other half of the antenna. The design seemed relatively simple to build, requiring only a single toroid and a capacitor made with a. The following program will calculate the lengths needed to construct several popular wire antennas. Two opposingdirection slopers fed to a phasing unit is a timetested interferencefighting solution endorsed by a number of the hobbys better known practitioners. Single and multielement directive antennas for the low bands with calculations and practical experience, this book shows which basic concepts have to be considered for sloper antennas for the low bands.
According to the arrl antenna book 18 th addition there are two sloper design definitions a sloping. Super sloper all band antenna up for bid is a new antenna developed and handcrafted by lowbander to bring all band coverage to swls at a reasonable price. The g5rv antenna is a multiband centerfed dipole antenna capable of 1500 watts. The other antenna was made by antenna specialist who are still in business and may still produce the super scanner. Kb6nu finally builds an endfed, halfwave antenna kb6nu.
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 halfsloper. Testsite conditions for our quarter wave sloper vs invertedv dipole because of the above stated variables we wanted to. If you have no particular preference within a given ham radio band, then simply enter its center frequency i. The results are conveniently displayed in inches, centimeters, feet and meters. Antenna descriptions and pattern plots are easily saved and recalled for future analysis. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. Ive posted about endfed, halfwave antennas before, but until this weekend, id never built one. Such a problem can be solved by mounting a dipole at a slope. Enter the desired frequency and select the desired calculation from the drop box. 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. This is just a sloping half wave dipole, also sometimes called full sloper, half wave sloper, or just sloper. Given an area where you could locate a sloper antenna with a tall mounting pole topendfeedpoint and the. The reduced length is of course to support reduced space availability.
Download hf dipole calculator 12 wave wire dipole antenna. Changing these values will change the shape of the 40meter swr curve somewhat. The yagi plays the role of a ground plane, while the tower plays the double role of reflector and grounding rod. This antenna beams into three quadrants without the use of a rotator. They operate as quarter wave slopers, which means that the wires are one quarter wavelength long. Alpha delta hf swl sloper antennas dxswl free shipping. If only one half of it is used it becomes a half sloper.
The coax jumpers made the other 2 unactive elements. This is a 14 wavelength wire that uses the tower as the other half of the. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. The correct lengths for the various models will be displayed in the chart.
Previously, gathering all the necessary information to construct. Doug vk3um was a friend from our days at unley high school during the mid 1950s, a common interest was that of radio and electronics leading to our introduction to ham radio through the 288mhz band now no longer part of australian allocations. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. This is a 14 wavelength wire that uses the tower as the other half of the antenna. I could not find any published formula for them but only sample antennas. Testsite conditions for our quarter wave sloper vs invertedv dipole because of the above stated variables we wanted to test these antennas over the. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. Endfed wire antenna lengths amateur radio stack exchange. The sloper s feed point is anchored high above ground near the top of the tower on which sits a grounded hf yagi beam antenna.
This antenna can be angled anywhere in a range from 0 as a halfwave vertical dipole, to 90 as a flattop horizontal dipole. The foregoing study does show that, for a simple antenna, the sloper has a lot going for it. The sloper antenna explained with a twist hf antenna basics are not hard to grasp when explained in simple terms as they are in these ebooks. Antenna design freeware 1d and 2d arrays from mei software. Use on 160 meters as marconi with tuner and ground. Designed for limited spaced applications and ruggedly built for many years of service. I want to use an endfed wire antenna, but what would be the best length of wire for the 20m and 40m bands. The biggest advantage of the super sloper is that it will fit into almost anyones yard.
It has the yagis gain and the quads direct feed and signal capture. The design elements of a 160m half sloper are very simple. Endfed 12 wave 30w 80m10m wire antenna endfed 12 wave 30w 80m10m wire antenna full hf coverage, no tuner needed on most frequencies. What is the best direction to point a sloper antenna for. A reducedsize half sloper for 160 meters qst march 1998, pp. If you calculate a particular length based on a desired operating frequency and cut the wire to that length, then by definition the antenna is not a random wire. Sloper or slant antennas require only one elevated support 25 feet 7. The classic sloper antenna is a topfed 14 wave vertical antenna sloping down and away from a tower. We have been building these antennas for over 19 years. 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. Ver2calwireantenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya. As part of the 160m sloper project, i needed to decide on the antenna modeling software that i wanted to use. This is a common antenna configuration in the world of amateur radio referred to as a sloper or more accurately, halfwave sloper.
Our best selling antenna is our 160 meter, ruggedized half sloper. Buckmaster ocf dipole antennas buckmasters best coaxial cables antenna support rope harken stainless steel pulleys stringliner reel with 270 feet of twisted nylon line antenna wire screwon cablewire clamps linegrips rf chokes cq magazine archives great circle azimuthal equidistant maps world prefix and worked all states was maps hamcall. Sloper antenna for both 40 and 15m bands cut into tower guy wire. A reducedsize half sloper for 160 meters heres a limitedspace antenna that will put you on the top band. Getting a big dx signal on 16010 m from one small, low. This app does nothing more than the standard 468freq mhz type calculations. Antenna, ve3sqb ham radio antenna design software programs. Some people put half slopers not half wave slopers on their tower. If you would rather calculate the length of a fullsize vertical antenna, see the quarterwave vertical antenna calculator.
Alpha delta hf swl sloper antennas are a very unique and very effective adaptation of existing antenna theory. Sloper antenna for the 10m bands cut into towers south guy wire. Wire antenna calculator with images ham radio antenna. Sloper antenna category is a curation of 17 web resources on, arrl sloper antenna, 10m sloper, ik4dcs 80160 mt sloper antennas. D eciding to put up a loop antenna can be more of a logistical problem than an engineering problem in the initial phases of your project planning. By using relays, a single feed line could be switched to 1 of 3 elements or to all for an omni position. Figure 2 a three dimensional view of the radiation pattern of the 10m sloper at 28. The sloper antenna explained with a twist ham radio.
No long counterpoise, radials or feedline required. Getting a big dx signal on 16010 m from one small, low antenna. 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 sloper antenna explained with a twist ham radio, ham. The antenna calculator is a very simple and easy piece of software. The 160meter sloper system at k3lr qst august 1994, pp. Dont think of this as just one antenna, but rather a whole family of antennas, one for each half wavelength of added length.
Here are some hf antennas that require less space, while remaining very effective. The alpha delta dxswl sloper antenna offers exceptional features and performance. Were talking about reasonable heights on a given band as discussed in the antenna literature. The reduced half sloper reduced half sloper adds a loading coil and shortens the wire accordingly. 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. The measurements below are for building a simple dipole antenna. See the pattern and antenna currents on the same color 3d display as the antenna.
In the past ive used eznec, and elnec before that having purchased that software from w7el, and have always been very happy with the results. While horizontal dipoles required two large support masts, this antenna type only needs one large mast. This calculator was adapted from the coilshortened dipole antenna calculator. T he purpose of the calculator is to give you a quick overview of the feasibility of squeezing a loop into your available yard or apartment space. Texan936 ham radio the shortwave antenna explained, from how it works to how to choose the type that will best fit your needs and swl listening environment. What is the best direction to point a sloper antenna for dx. The sloper antenna is a slanted dipole antenna advantages. Once settling on 4nec2 as the modeling software, i started fiddling with the new antenna itself.