Radioworks cws80 radio works carolina windom 80 special. This windom handbook is the most read windom antenna handbook, and the most duplicated document by both amateurs and commercial builders. The size is somewhat formidable, but the carolina windom 160 is a single antenna that does it au from local 1601 75 round tables to 10 meter dx. This is about the ocfd and not a windom, carolina windom, or endfed zepp. Thank you for purchasing and using the chameleon antennatm 40 meter windom cha windom 40 antenna. Choke ununs dx engineering fcc050ho5a 160 to 6 meters, 2kw cw5kw ssb ugly choke ununs usually 15 to 22 feet of rg8 coax wound on a form 4 to 6 inches in diameter. That was the end of my beloved cw 80 antenna by radio works. Its the real carolina windom 80 with only onehalf the support length needed.
It is an off centre fed dipole, with 10 feet of vertical radiator. This link is listed in our web site directory since sunday mar 19 2006, and till today new carolina windom antenna has been followed for a total of 43352 times. Oct 15, 2015 with 256 feet of wire, a flattop or invertedv are about the only support options available. May 25, 2016 swr values for a center fed 12 wavelength dipole blue and a windom antenna red. Thebuxcomm model 8024 windom is an antenna that enables operation, 80 through 6 meters, without an antenna tuner. Vat download a pdf document for cws80 radio works carolina windom 80 special antenna. 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. Windom s original idea was offcenter feeding a horizontal antenna to present a feedpoint impedance of 600 ohms. By 1924 the 80, 40, and 20m bands had been allocated for amateur use in the uk. In practice, under this condition we have an swr ratio of 1. The carolina windom s transmit performance is miserable but the receive performance is far better than the random wire.
Field day i had an opportunity to use a very good one. Carolina windom 80 compact halfsize, fullperformance, full coverage. By serendipity, it also covers the 17 and 2 meter bands. The feedpoint of this type of antennas off center has an impedance of about 300 ohms. The ocf fd4 fd3 windom antenna fd4 80402010 m the 4band fritzel model fd4 is a special version of a windom antenna. Buck rogers sr 68 years as k4abt the jpole has been around since the early days of ham radio, and is a direct descendant of the windom like the windom or zepp, the jpole is a spinoff, or a modified windom for vhf and uhf. Unun means unbalanced to unbalanced this is a device inserted into a coaxial transmission line usually to reduce common mode currents more on that later.
In other words an 80meter windom 7 feet long would have one leg 45. Installation i installedthe 160 in a drooping dipoleman ner. The original windom antenna, with complete construction. Jul 07, 2009 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. The differences between this antenna and windom s is that the original windom is not a dipole.
Forced vertical radiation on part of the coax fills in the nulls off the ends of the dipole. Ive used it with a palstar at2k, an ldg z11pro automatic tuner and a ldg at200pro. Gb3br brighton has just come back on the air so ill be monitoring. A document describing my personal experience with 3 different models of carolina windoms, over 2 years of testing. There is antenna installation hints and grounding information. A wide range antenna tuner may be needed to operate the other bands between 60 and 10 meters. Keeps rf off the coax below this point part of that may all be true if the antenna is strung out horizontally. Windom off center fed antennas radios amplifiers baluns. 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. The carolina windom thus becomes a nearomnidirectional antenna.
All commercial use of the term the term carolina windom and commercial distribution of carolina windom antennas is reserved. Finally one year in the contest i got the idea to try my 80m dipole as a t antenna a top loaded vertical. The original windom antenna, with complete construction details. I like this fine ocf antenna because it performs as advertised. 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 in other words, the 22 feet vertical component of the carolina between the 4. I had a carolina windom antenna up for nearly 10 years before a vicious wind storm brought it down, smashed the matching transformer and cracked the line isolator. New carolina windom antenna pop pdf file by qrp expressions by by n. I added the correct measurements of copper strand, 50ft on one side and 83ft. Homemade carolina windom antenna m0ukd amateur radio.
The differences between this antenna and windoms is that the original windom is not a dipole. It was designed to cover 80, 40, 20 15, and 10 meters. Acenterfeddipoleandcanbeconstructedasamulfband antenna. The 4band antennas are ocf offcenterfed, with a 23 foot leg and a 45 foot leg, totaling 68 feet not 66 feet. Jun 10, 2017 example of using 4nec2 to read the 20m carolina windom eznec format file from the arrl 22nd edition antenna book compilation of. Used a g5rv for years then had a break of some 20 years. That antenna forces 22 of coax connected to the antenna to be a radiator so that 22 must.
New carolina windom k4iwl ocf antenna hamwaves windom antenna dj2kt windom antenna from ja7kpi windom antenna sv1bsx windom balun winding instructions windom antenna the carolina version windom off center feed w8ji. I am perplexed that the random wire is deaf across all the bands but transmits much better than the windom. Introduction an overview of common ham antennas for. The windom antenna the windom antenna is almost as old as the random wire. This is close to the surge impedance of a singlewire feed line, allowing an inexpensive single conductor to be used as a feed line. The goal of the simulations is to check the behaviour of the antenna both in it fundamental band of design and in the harmonic bands, taking into account the impedance and the radiation patterns. Carolina windom 80 the perfect, high performance antenna. Keepingtheends 1 1 2 8 9 0 0 0 0 0 0 0 3 21\ 1 it, v v 183it 1 reeol ice to srao 82 n figure 1. As a matter of interest, we use the windom buxcomm model 8024 up to 2 meters 146 mhz. Carolina windom antenna american radio relay league. 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. 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. Homemade carolina windom antenna m0ukd amateur radio blog. Nvis antenna information near vertical incident skywave nvis antenna w0ipl commercial windom ocf antennas balun.
All the power goes up to thefeedpoint with coax and very little comes back because we will chokeit. A touch of class, the windom and the jpole by glynn e. The cha windom 40 is a broadband high frequency hf offcenter fed dipole ocfd antenna, specifically designed for the 40, 20, and 10 meter amateur bands. Transmitting has been done on a carolina windom and also a 55 random wirecounterpoise antenna on 806m. So, using the example shown in fig 3 of a ten metre wire, the leadin would be 3. Doing so for the multiband windom or offcenterfed dipole antenna see table below, leads to a stunning revelation. This is no longer available please see the eantenna 160ocf1,5 ocf windom 160m 1,5kw r2010022 radio works carolina windom 160 carolina windom 160 cw160 160 10m inc warc gain, low angle. About new carolina windom antenna the resource is currently listed in in 2 categories.
This article describes the characteristics of the windom antenna and shows the results of several simulations made with mmanagal, covering models optimized for the 20 m, 40 m and 80 m bands. For this design we look at a resonant dipole for the lowest band desired and feed it off center with a balun. This is an adobe pdf file and may uploaded to your desktop and printed, depending on how you have your pdf reader set up. The radiowavz dx ocf windom is a off center fed ocf dipole antenna that exhibits outstanding performance on all bands.
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. Cws80 radio works carolina windom 80 special antenna. The carolina windom antenna 160m special by radio works. I removed a carolina windom 80 which is the best wire antenna that i have ever used and replaced it with the carolina windom 160. The scheme of the antenna and swr values are attached as pdf file. The carolina windom antenna the 160m10m special version by radio works. A sixband, hf windom antenna april, 1997 this windom antenna was marketed in the late 70s and early 80s as smithes windom. Radioworks cws80 radio works carolina windom 80 special radi. The windom antenna this antenna is basically a random wire but with the leadin mounted away from the end closest to the receiver some 36% of the overall length of the wire. What became perhaps the most popular multiband windom design of all, was the german.
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. Carolina windom 80m carolina windom 160 160m carolina beam 80m, but with hanging ends i tested these antennas extensively for two years. Clone of the carolina windom g4nsj helical windom antenna nc4tc new carolina windom k4iwl ocf antenna hamwaves windom antenna dj2kt windom antenna from ja7kpi windom antenna sv1bsx windom balun winding instructions windom antenna the carolina version windom off center feed w8ji. My carolina windom antenna 160m special i had a carolina windom antenna up for nearly 10 years before a vicious wind storm brought it down, smashed the matching transformer and cracked the line isolator. I dont have room for an 80meter dipole or long wire so i have to. I have wanted to build a multiband wire antenna for some time now and this past. For now, you can read my story in the pdf download. Dont know the maths or the theory, but this antenna works as well as a g5rv. Carolina windom the theory behind the carolina windom makes sense. The radiowavz dx ocf windom is ideal for those of you who do not use a tower and beam. The new carolina windom antenna radio broadcasting scribd. Acenterfeddipoleandcanbeconstructedasamulfbandantenna. Construct a multiband offcenterfed ocf dipole covering the 40, 20, 15, and 10 meters amateur radio bands, and possibly the 6 meter band but that is considered a bonus band, outside the main project objective.
The long history of windom antennas by robert brown, m0rzf contributions by rick westerman, dj0ip in the 1920s valve transmitters had replaced spark gaps, and the concept of transmitting continuous wave cw in narrow bandwidths was widely known. This windom antenna was marketed in the late 70s and early 80s as smithes windom. Cebik w4rnl sk fed with ladderline and an antenna tuner, this will. Ran some models of both a centerfed dipole and a windom on nec2. I tied both sides of the coax together and fed it through an. I find that this radio works carolina windom is not as sensitive on 40m as my home brewed off center fed antenna. Len carlson, k4iwl offcenter fed windom antenna with vertical radiator 80 to 6 meters, 2 kw, designed to be used at heights of only 25 to 45 feet, includes a twenty foot long vertical radiator. This is the same design as the carolina windom 80 special you can buy one of. Eric webner k4fan dave tyndell kk4ly k4kl optibeam. This is a very desirable characteristic on the lower bands 40 meters, 80 meters and 160 meters. G4nsj amateur radio ray qth worthing west sussex uk locator io 90 tt im active on two metres, also monitor gb3wo 70cms repeater in worthing, west sussex. Ideally, this antenna should be at least 35 feet above ground, but mine is. The carolina windom is the pattern suitable for all uses that do not require an on ultimate version of an offcenterfed antenna, and weve the horizon low.
Len carlson, k4iwl smithe windom six band hf windom antenna. Its also ideal for those who want a high performance antenna with world class dx coverage 80, 40, 20, and 10 meters. 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. Id like to work 10,15 and 40 m without any antenna tuner. This is a custom built version of the carolina windom 40. The modern common windom antenna is not an original singlewire fed windom, but rather an offcenterfed or ocf two wire feed dipole. The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of vswr.
Radio works cw160, carolina windom radio works wire antennas. The carolina windom 40 has been at my qth since may, 2009. Wave end fed 20 meter vertical and sloping wire antennas eznec analysis by pete rimmel, n8pr. Example of using 4nec2 to read the 20m carolina windom eznec format file from the arrl 22nd edition antenna book compilation of. With 256 feet of wire, a flattop or invertedv are about the only support options available. The main category is windom antenna that is about windom antenna links. Although the specs for the antenna are to work on 40m, my rig will not tune it. The choke balun at the bottom of the 22 feet radiating vertical effectively isolates it from the coaxial feedline going down to the transceiver. Figure 2 is the electrical equivalent of the traditional carolina windom. New carolina windom by k4iwl len carson carolina windom. It will not hurt the antennas efficiency if you bend the ends of the antenna slightly to make it fit into the space you. Radio works cw160, carolina windom radio works wire. 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. The antenna was a halfwave in length using a single wire feeder of any length attached 0.
Although larger swr ranges are found the atu in the transceiver would be able to handle both antennas probably without the need of an external autotuner. It must be made of durable, high quality, weather worthy components. Since our return home for the u s marines midfifties we have built more true windoms than all the other antenna builders combined. In 1937, the windom was first described as a compromise multiband antenna. The normal windom is described as having a length leg, and a 23 length leg. Loren windom, w8gzw8zg, was the first to reveal the windom antenna to the radio amateur community by describing the antenna in the september issue of qst. My goal is to have a single wire antenna that will fit my yard and give me the most miles per watt. This link is listed in our web site directory since sunday mar 19 2006, and till today new carolina windom antenna has been followed for a total of 43352 t. It loads equally as well with all three tuners giving a nice match. The windom antenna is an offcenter fed dipole with an unbalanced coax feedline. I have a new carolina windom i was given a radioworks carolina windom which was setup for 40 meters.