Windom antenna design software

The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and warc bands only available with an antenna. The windom is also an efficient, allround, multiband radiator in the early days of radio when a transmitter worked at only one frequency the antenna would be used on the dipoles fundamental resonance and the feedline would be zo matched by the dipoles input impedance as just described. The original windom antenna, with complete construction details. The carolina windom antenna 160m special by radio works.

Why not take advantage of their big signal secret with the carolina windom. In other words an 80meter windom 7 feet long would have one leg 45. This antenna software module also helps you validate existing antenna designs and study a plethora of antenna design issues, including. Since 1992, you heard the carolina windom from navassa and albania among several other dxpeditions. Mogpie is a software development company owned by m0cvo antennas that. The program use the mininec3 engine modified by alexandre schewelew, dl1pbd, and are. Its also ideal for those who want a high performance antenna with world class dx coverage 80, 40, 20, and 10 meters. There are a lot of articles out there of how to build a carolina windom antenna. Evolving from a simple endfed marconi for 80m, the idea was to use the opposing. Id like to build a carolina windom antenna, but am limited to the total overall length. Some of the choices include copper, copperclad steel, copperplated steel, aluminum. Hf windom antenna, cover 80, 40, 20 15, and 10 meters, antenna design. It is a halfwave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at onethird from one end.

The long end of the antenna is 89 feet long and runs into the back yard. For tube antennas it will also give the capacitance values to tune the antenna to resonance. Wire selection antenna wire considerations many types of wire can be used to construct wire antennas. This link is listed in our web site directory since saturday jan 2007, and till today the fd4 fd3 windom antenna has been followed for a total of 51908 ti. By serendipity, it also covers the 17 and 2 meter bands. Zepp antenna theory windom antenna theory 4080 meter inverted v dipole antenna antennas for difficult situations g7fek limited space antenna nested marconi antenna doublet aerial for hf amateur ham radio short wave bands some general talk about design and builds, worth watching, useful info. In other words, the 22 feet vertical component of the carolina between the 4. Thus i set out to design an hf antenna with a vswr of 3. Homemade carolina windom antenna m0ukd amateur radio blog. The normal windom is described as having a length leg, and a 23 length leg. What became perhaps the most popular multiband windom design of all, was the germanmade fritzel fd4 antenna, described by the late dr. Antenna modeling files american radio relay league. I run 4nec2 flawlessly on gnulinux using the equally free playon linux software.

The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of vswr. Acenterfeddipoleandcanbeconstructedasamulfband antenna. Ant file was used to optimise the windom antenna using antenna optimizer ao. These same characteristics also make the carolina windom an excellent receiving antenna. Therefore, id like to design it around the 66 length cut for 40 meters and all the related bands on which that size antenna will operate. See the pattern and antenna currents on the same color 3d display as the antenna. Some of the choices include copper, copperclad steel, copperplated steel, aluminum, aluminumclad steel, aluminumplated steel, steel, harddrawn, soft drawn, solid, stranded, bare. About a double windom antenna for eight or nine bands the resource is currently listed in in a single category. Homemade carolina windom antenna m0ukd amateur radio. Nvis antenna information near vertical incident skywave nvis antenna w0ipl commercial windom ocf antennas alpha delta balun designs baluns maxcon antennas radio. Buck may be a foul mood when you call him on the phone, but he obviously knows how to design an antenna that works as advertised. The following notes show the design and construction of a broadband hf vertical antenna which does not require a tuner, and which is capable of providing moderate performance on all bands from 7mhz to 28mhz reduced performance from 3. It was designed to cover 80, 40, 20 15, and 10 meters.

Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. The basic source code of the computation engine is published as a pds in mininec. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. Electromagne2c wavepolariza2on electricandmagne2cwavesareat rightanglestoeachother magne2cwavedissipateswithina fewwavelengthsof antenna. Find a station with a consistentlystrong signal and you probably have found a station with a good antenna. The antennas produced by us are all manufactured by nigel booth, m0cvo. Acenterfeddipoleandcanbeconstructedasamulfbandantenna. Describe your experience with the buxcomm windom 806 meters and tell us why you give it the rating you did required. When experiencing problems running 4nec2, please consult the list known bugs page on this website for latest news. The antenna is feeded at a distance of 14 % of the total length, measured from the center point.

Loren was originally 8zo from columbus, ohio in 1922. Thebuxcomm model 8024 windom is an antenna that enables operation, 80 through 6 meters, without an antenna tuner. Antenna design freeware 1d and 2d arrays from mei software. This is the same design as the carolina windom 80 special you can buy one of. When the vertical wire is connected to one end of the dipole the antenna then becomes an invertedl. Windom antenna dj2kt windom antenna from ja7kpi windom antenna sv1bsx windom balun winding instructions windom antenna the carolina version windom off center feed w8ji. Whats the correct way to build a carolina windom antenna. However, as modeled by this program, the windom is an efficient radiator at all frequencies at which the height of the vertical element plus the longest horizontal section is greater than about 16th wavelength, i. New carolina windom shown cut for 40, 20, 15 and 10 meters. The image below shows the information on my loop above, at 14mhz with 50w rf. Its also ideal for those who want a high performance antenna with world class dx coverage 80, 40, 30, 17, and 12 meters. May 19, 2016 antenna design by 4nec2 withaya hongsa. Multiband offcenter fed hf dipole antenna, windom antenna, logperiodic. In 1937, the windom was first described as a compromise multiband antenna.

It will operate on 80, 30, and 17meters but will require a tuner for these bands. Windom antenna links category is a curation of 28 web resources on, i7swx windom antnena, offcenter fed windom antenna with vertical radiator, the coaxfed windom. Balun designs established in 2005, balun designs builds exceptional quality baluns and ununs for amateur radio, military and commercial applications. Antenna modeling files introduction in january, 1998, the arrl board of directors changed the arrl advertisementacceptance policy to permit the advertising of antenna gain figures for antennas whose performance can be accurately modeled using either nec4 or yagi optimizer modeling programs. Getting back on the air researched several wires which would fit my garden, tried a homebrew carolina windom and hey presto its a gem on all bands but top band. Windom antenna the carolina version windom off center feed w8ji. Its also ideal for those who want a high performance antenna with. G7fek limited space antenna g7fek multiband nested marconi antenna 2008 version rev 5 this antenna was first conceived as a simple dual band antenna in 1988, in an attempt to achieve sensible dual band operation in a small garden of 14m 46 ft length.

Obtain the radiation pattern of any antenna over a frequency range. Obtain the vector frequency response of arbitrary 3d antenna structures. You will find a wealth of free antenna design information and software below. I would now have access to all hf bands 16010 meters with an antenna type that had exceeded my expectations for years. Directional antennasmobile antennas4 element yagi buildingbuilding a 4 element cubical quad. This page contains all resources about hf antennas available in. With yagicad it is possible to enter a base design from scratch or use one of a number of saved well known designs. Think of the carolina windom antenna the modern version of the windom as an upside down vertical antenna, hanging down from its counterpoise strung more or less horizontally some 10 meters or more above ground. Windom the windom antenna the windom is a 12wave horizontal dipole fed. Go to the website and read his thoughtful insight yourself, and make your own decision. Wanting to discuss ocfds and singlewirefed windom antennas. Multiple patterns can be superimposed on a single graph for comparison. About the fd4 fd3 windom antenna the resource is currently listed in in 4 categories. The 4band fritzel model fd4 is a special version of a windom antenna.

Ja7kpi modified this antenna originally used as invertedv type of 80m band dipole. Dont know the maths or the theory, but this antenna works as well as a g5rv. Jul 23, 2008 a old carolina windom with the ladderline after the balun, or a new carolina made from all coax. Magnetic loop design software this is the handy tool that helped me decide what size loop to build in each case. Jerry sevick and are hand wound with best available components to provide highest possible efficiency. Electromagne2c wavepolariza2on electricandmagne2cwavesareat rightanglestoeachother magne2cwavedissipateswithina fewwavelengthsofantenna. This design can then be optimised or scaled to suit particular requirements. Mar 29, 2020 the differences between the new carolina windom antenna and windom. Mmanagal l is an antenna analyzing tool based on the moment method, which was introduced in mininec version 3. Nov 25, 2015 introducing the w8amz 806m ocf windom multiband antenna using a 4.

This is a popular antenna design as the performance is very good across the hf bands and requires little or no tuning. Ja7kpi windom antenna for 4080 the total length of this antenna is 41m, height is about 11m, and diameter of element is 2mm. Paul has detailed swr curves of his antenna on his web site on this page. Windom, w8gz who described it in september 1929 qst.

To download and try the software click upmost two links below on the right setup. Study of g0fah off centre fed dipole ocfd 40m20m15m 10m 40m 20m 10m the g0fah 4band antenna is modelled using mmanagal basic freeware antennal analysis software. It will not hurt the antenna s efficiency if you bend the ends of the antenna slightly to make it fit into the space you have. Description and simulation of two types of rhombic antennas, using the software. On the other hand, an ocf dipole is an ungrounded dipole antenna fed with twinconductor line, either coaxial or open wire parallel conductors. The original windom was a zepptype antenna fed 14% offcenter with a single wire. Windom the windom antenna the windom is a 12wave horizontal dipole fed offcentre by a singlewire nonresonant transmission line. This antenna can give you an sunit or two advantage. Company website for m0cvo antennas, complete with product background.

Whats the difference between these two ocf designs. They may not all be totally new designs but, i hope that they are an improvement on the originals. Windom s original idea was offcenter feeding a horizontal antenna to present a feedpoint impedance of 600 ohms. Having a 50m fibreglass tape measure is essential when building hf antennas. It is recommended to use a rf choke to avoid currents returning to the transceiver. It is an off centre fed dipole, with 10 feet of vertical radiator. Nov 06, 2015 the apex of the antenna is hung from the peak of my roof. The singlewire feeder radiated rf all the way into the operating position. The carolina windom has been the performance choice of big gun dxers and dxpeditions. M0cvo antennas, amateur radio antennas for fixed station or portable operations, hf6m all are catered for. I settled on the new carolina windom design by k4iwl. Antenna descriptions and pattern plots are easily saved and recalled for future analysis. Resources listed under windom category belongs to antennas main collection, and. The main category is windom antenna that is about windom antenna links.

First try at hanging the windom revealed that my favorite tree limb was about 10 feet too close to one end of the back yard and the antenna wouldnt fit. Used a g5rv for years then had a break of some 20 years. The modern common windom antenna is not an original singlewire fed windom, but rather an offcenterfed or ocf two wire feed dipole. Last year on field day i was able to use an ocf dipole for the first time, and i enjoyed the quick bandswitching it allowed, so i thought id try and find a good ocf dipole for use while in the field. Yagicad is a fully integrated analysis and design package primarily intended for vhf yagi aerials. A windom antenna for 10 to 80 meters band a design by pu1lhp related posts via taxonomiesgap titan dx maintenancethe gamma matcha 40m vertical antennathe grid yagiquickie verticalabout loop antennasantenna basics. Rotate the antenna display and zoom in for details. The reason i asked is im replacing an ebay special i purchased recently as a quick and easy antenna to get me on the air at a temporary qth. The original windom antenna, with complete construction. Its a grounded vertical wire connected to a horizontal portion acting as a top hat capacitance. Most of our units are derived from the researched and tested designs of dr. If its a new carolina windom, it calls for your random length of coax feedline be connected to a 1.

The line isolator stops the vertical radiator radiating all the way back to the shack. The shorter wire is 44 feet long and is supported at the apex height of 25 feet by a birch tree in the front yard. Describe your experience with the buxcomm windom 806 meters and tell us why you give it the rating you did. This windom antenna was marketed in the late 70s and early 80s as smithes windom. W8amz 806m ocf dipole windom multiband antenna w 4. This article describes the characteristics of the windom antenna and.

I found several formulas on the internet to design windoms, but they conflicted each other by feet, not inches. A software application can be used to determine antenna characteristics. As a matter of interest, we use the windom buxcomm model 8024 up to 2 meters 146 mhz. The radiowavz dx ocf windom is ideal for those of you who do not use a tower and beam. The carolina windom, however, wants the feed line to radiate at least a portion of it in order to gain the vertical radiation and some performance. A windom antenna is a singlewirefed antenna which is worked against ground. The only optimisation or synthesis program for wire antennas that i am aware of is antenna optimizer. On the low bands, the carolina windom 160s rivals are few, if there are any at all, but you need a lot of room to put one up. Windom, ex w8gz, was instrumental in the development of the windom antenna. The radiowavz carolina windom is ideal for those of you who do not use a tower and beam. A double windom antenna for eight or nine bands by hubert scholle, dj7sh, and rolf steins, dl1bbc the asymmetrical dipole antenna developed and described by windom w8gz in 1929 has been used by many amateurs for many years as the fd4. This link is listed in our web site directory since friday dec 16 2016, and till today a double windom antenna for eight or nine bands has been followed for a total of 1644 times.

The radiowavz dx ocf windom is a off center fed ocf dipole antenna that exhibits outstanding performance on all bands. This windom handbook is the most read windom antenna handbook, and the most duplicated document by both amateurs and commercial builders. Check my logs everything starting 24 april 2004 was on the windom its the only hf antenna i have up the windom at ve1dx is up a little higher than mine is, but doesnt include the extra two wires for 1530 meters. Over many years, antenna dimensions and feed locations have not changed much from the original singlewire design, whereas balun feed impedances have decreased from 500. A double windom antenna for eight or nine bands resource. But after selecting a new tree, and some careful pruning about 2 hours worth with a ladder and a chain saw, the windom was flying and ready to play.