The reason in many cases is the builder did not convert the number in the calculator that is after the decimal point. The author considers factors that can help you decide. The correct lengths for the various models will be displayed in the chart. Our best selling antenna is our 160 meter, ruggedized halfsloper. 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. Testsite conditions for our quarter wave sloper vs invertedv dipole because of the above stated variables we wanted to. The half sloper is an antenna that is hard to categorize, since it is not a sloping dipole and it is not a vertical. Previously, gathering all the necessary information to construct. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Birmingham, alabama crystal radio group the sloper antenna. Going from one antenna to the other produced different dominants on several channels, for instance wjtome730 and wganme560 on the east sloper, wacema730 and whynma560 on the west sloper.
Dont think of this as just one antenna, but rather a whole family of antennas, one for each half wavelength of added length. Dipole antenna length calculator dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. 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. Designed for limited spaced applications and ruggedly built for many years of service. Amateur radio document library, antennas, schematics, homebrewing, connections. Electromagne2c wavepolariza2on electricandmagne2cwavesareat rightanglestoeachother magne2cwavedissipateswithina fewwavelengthsofantenna.
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. This antenna is really a variation of an invertedl fed directly without a feedline from the tuner. But, it assumes the potential newcomer to 160 has a tower or other very tall metallic support to anchor one end of the wire to. Figure 3construction details for the pvc mounting pipe and coil. The basic formula for determining the length of a center fed, halfwave wire dipole or inverted vee antenna is. Understanding antennas for the nontechnical ham by n4ja. Radio amateur hf radio ham radio antenna short waves circuits hams engineering ham radio calculator. About sloper antenna tests the resource is currently listed in in 3 categories. Antenna calculator length of the dipole antenna calculation. Changing these values will change the shape of the 40meter swr curve somewhat. Transmitters provide oscillating electrical energy on to the antenna which radiates them as electromagnetic waves. Sloper antenna for the 10m bands cut into towers south guy wire. The main category is sloper antenna that is about sloper antenna. Each wire has one end connected to antenna and the other end is left free.
Coils achieving the highest quality factor require large diameter wire, strip or tubing and usually exhibit a cubical form factor. The measurements below are for building a simple dipole antenna. A shortened multiband endfed half wave efhw antenna for 8010m steve nichols g0kya a shortened multiband antenna, about 23m long. The inductance obtained by this calculator will therefore be slightly overstated. 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. We have been building these antennas for over 19 years. A very basic program for calculating the length of each leg of a 12 wave wire dipole antenna. A reducedsize half sloper for 160 meters page 2 arrl 1998 qstqexncj cd c i ht c 1999 b th a i r di r l l i. Alpha delta hf swl sloper antennas dxswl free shipping on. The antenna tuner is a 1977 heathkit hft9, a small qrp size tuner of the capcoilcap doublel design. Unfollow sloper antenna to stop getting updates on your ebay feed. Wire antenna calculator amateur radio station ws6x. It was established experimentally that sloper wins on a top loaded vertical of 21meter about 10 db in the direction of maximum radiation and the same amount less in the back. Do you have 45 of space and have the ability to hang an antenna from a tower or tree 4045 up.
The free end of each wires are pointed towards opposite direction of the other free end. Since 20,for the top band, i use a half sloper originaly based on wd8dsb design but i have rectif it to some european dimensions and materials. Download hf dipole calculator 12 wave wire dipole antenna. The sloper antenna is a slanted dipole antenna advantages. The classic sloper antenna is a topfed 14 wave vertical antenna sloping down and away from a tower. The sloper antenna explained with a twist ham radio. To bring the resonant frequency down, lengthen the 14 wave stub. 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 antenna has a full 300khz bandwidth on 80m between 3. A shortened multiband endfed half wave efhw antenna for 8010m steve nichols g0kya a shortened multiband antenna, about 23m long, for 80m10m that offers low swr 1.
The dl6wu yagi is highly regarded as being easy to build with repeatable results, broad bandwidth and a useful pattern. Welcome to the birmingham, alabama crystal radio group website. There are two ways to think about antenna and propagation problems in linear media. The reduced length is of course to support reduced space availability. The western sloper had a somewhat narrower easterly null, most effective between 60 and 120 degrees. Online and downloadable dipole, inverted v and ground plane calculators. A reducedsize half sloper for 160 meters qst march 1998, pp. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. While horizontal dipoles required two large support masts, this antenna type only needs one large mast. West mountain radio double bazooka nvis antenna calculator. Wire antenna calculator amateur radio ham radio station ws6x. 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. Were talking about reasonable heights on a given band as discussed in the antenna literature.
Endfed wire antenna lengths amateur radio stack exchange. 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. These fundamentals are supplemented by construction guidelines for directive antennas using a single element or several elements. But performance is down about 812db on a dipole on 80m.
The western sloper had a slight gain advantage a bit more often on these because its grounding was in a somewhat wetter location. Sloper or slant antennas require only one elevated support 25 feet 7. Sloper antenna category is a curation of 17 web resources on, arrl sloper antenna, 10m sloper, ik4dcs 80160 mt sloper 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. Long yagi are commonly used from the 144mhz amateur band to the 2. If you have no particular preference within a given ham radio band, then simply enter its center frequency i. Download the ground planedipoleinverted v calculator by n2imf. A shortened multiband endfed half wave efhw antenna. What is the best direction to point a sloper antenna for. The reduced half sloper reduced half sloper adds a loading coil and shortens the wire accordingly. In particular for low frequencies this antenna form is interesting. The yagi plays the role of a ground plane, while the tower plays the double role of reflector and grounding rod.
It is therefore widely used by radio amateurs with limited space. Antenna is an electrical device used to convert electrical power in to radio waves and vice versa. Build a double bazooka antenna k3dav version by david k3dav 1192010 2015. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. Antenna calculator for hf antennas ham radio secrets. The antenna calculator is a very simple and easy piece of software. An optimum height for an elevated hf antenna 1notes appear on page 38. It was written for dos many years ago and ported to win32. Antennas are equipped with radio transmitters and receivers.
The results are conveniently displayed in inches, centimeters, feet and meters. The calculator allows computation of all variables, including the eirp. Calculator allows to calculate length and other basic parameters of the various constructions of the dipole antennas taking into account dependence this. The vertical part is designed as half of the antenna bazooka. A directional antenna can help pull in some of the weaker stations while attenuating the stronger ones. Antenna calculator and design software electroschematics. The following program will calculate the lengths needed to construct several popular wire antennas. Ver2calwireantenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya. Sloper antenna for both 40 and 15m bands cut into tower guy wire. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Commenting onno6l 4 apr 2009 another fine idea for a 160m antenna. All you need to do is enter the desired resonant center frequency in the form below, then click calculate. According to the arrl antenna book 18 th addition there are two sloper design definitions a sloping. Bandwidth is much narrower than a centre fed dipole due to the tuned matching section, which.
So since jully 20, i use my version 4, definitiv antenna design. The antenna tuner will load an end fed long wire effectively, especially if it is cut to aprox. Wire antennas for ham radio sun country amateur radio. The inductor calculator presented on this page is unique in that it employs the n 0 sheath helix waveguide mode to determine the inductance of a coil, irrespective of. Ver2calwire antenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya.
I hope the calculator helps you with the logistical part, and gets you thinking about the engineering part. Given an area where you could locate a sloper antenna with a tall mounting pole topendfeedpoint and the. What is the best direction to point a sloper antenna for dx. This calculator provides quick estimation of antenna size required for a given gain and frequency. The 160meter sloper system at k3lr qst august 1994, pp. This page contains a little information about us and our crystal set activities. Lfmf short vertical antenna properties calculator the easiest antenna one could build for lf and mf operation. The biggest advantage of the super sloper is that it will fit into almost anyones yard. A shortened multiband endfed half wave efhw antenna for.
Build a double bazooka antenna k3dav version by david. We are the host of the crystal radio receiving contest. The measurements below are for building a double bazooka near vertical incident skywave nvis antenna. Once settling on 4nec2 as the modeling software, i started fiddling with the new antenna itself. The antenna modeled here is 7 high at the low end, and 35 high at the far end. Our best selling antenna is our 160 meter, ruggedized half sloper. Testsite conditions for our quarter wave sloper vs invertedv dipole because of the above stated variables we wanted to test these antennas over the. The alpha delta dxswl sloper antenna offers exceptional features and performance. If only one half of it is used it becomes a half sloper. Hams have been using slopers for years because slopers offer some unique advantages not found in other antennas. This online calculator can be used to find the length of the dipole antenna. 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. The two previous antenna designs, the inverted l and the t antenna, do not exhibit much directivity on the broadcast band frequencies.
Yagi calculator is a program build to produces dimensions for a dl6wu style long yagi antenna. They operate as quarter wave slopers, which means that the wires are one quarter wavelength long. 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. Technical concepts if you just want to build an antenna, skip ahead to the practical antennas discussion. This link is listed in our web site directory since saturday nov 29 2008, and till today sloper antenna tests has been followed for a total of 3021 times. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. As part of the 160m sloper project, i needed to decide on the antenna modeling software that i wanted to use. 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. Alpha delta hf swl sloper antennas are a very unique and very effective adaptation of existing antenna theory. 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. This app does nothing more than the standard 468freq mhz type calculations. For a tree installation, secure the coax to the pvc pipe behind the coil. It is usually not recommended because of the lower efficiency, compared to an invertedl or a marconi type antenna.
Jack, ke4id shows the patterns associated with a sloper antenna. Simple and effective 160m antennas at ua9ba lazy sloper. Wire antennas for ham radio sun country amateur radio society. Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz. A reducedsize half sloper for 160 meters heres a limitedspace antenna that will put you on the top band. The first online dipole and inverted v calculator on the page below has been around. The design elements of a 160m half sloper are very simple. Dec 29, 2015 yagi calculator is a program build to produces dimensions for a dl6wu style long yagi antenna. Getting on 160 meters on a budget by ve7ig on april, 2009 the point i was making is that a quarter wave sloper for 160 is much simpler to put up than the invertedl if you do have a tower and beam and that would probably apply to half the readers of your article who do have a tower and beam and are looking for a budget way to get. 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. 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. Alpha delta hf swl sloper antennas dxswl free shipping.
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