It should be remembered when considering its use that the quad, when fed at the bottom gives horizontal polarisation. All about cubical quad antennas the famous handbook on quad theory, design, construction and operation addeddate. Quad array four antennas also available call or email cubex for details. Even with a tiltover tower, tall ladders or a bucket truck may be needed. You can build a cubical quad with any number of elements, but make sure you read my section under feeding the antenna section if you are going to deviate from 4 elements. Congratulations your either a millennial or an old couch potato. Directional cubical quad and delta loop antennas, single band cubical quad, fieldstrength meter, the quagi, gain vs front to back radio, feed lines, antenna safety, erecting antennas on masts, tower safety, quarter wave matching sections of 70ohm coax chart, and much more. Hf vhf uhf antennas for ham radio cb military commercial using. This article was originally published in the arrl antenna compendium vol. The hf quad antenna works very well at a low height. The boom utilized is a square 114 white vinyl railing balusters made by fiberon pn 44551 and found at lowes. However the cubical quad beam antenna is able to provide some advantages in a number of circumstances.
Since each element of band quad is a simple antenna, with this quad contains five concentric loops. But if you want only a single antenna as a monobander or a multibander, the cubical quad is very tough to beat. I have fed quad loops with open wire line 650 ohm directly from a balanced tuner, in which case impedance doesnt really matter. If youre looking to purchase a cubical quad antenna, youve come to the right place. Broad band dipole and wire dipole for mitary use and professional use. The dx expeditions are easy with our antenna or hf antennas broad band or single band. The cubical quad or quad antenna has traditionally not been as widely used as its more popular cousin the yagi. A fiveelement quad antenna for 2 meters by jim reynante, kd6glfpo box 27856san diego, ca 92198 if your station is located on the fringe of the repeaters coverage area, youve come to the right place. More ice than that, however, would start to break things.
Our antennas are all supplied completely preassembled and precalibrated, and not with assembled kit. Suggested by umg queen bohemian rhapsody official video remastered. Since a loop radiates broadside, concentric elements are not in each others way. The cubical quad antenna calculator for citizens band cb radio and amateur radio communications to calculate the spacing between the reflector and driven elements and directors.
The length of a fullwave antenna is given by the formula 1005 frequency in mhz total length of the loop. Quad antenna design having successfully operated for many years with various types of three element beams, mainly for convenience, i decided to try and build a two element three band cubical quad. A quad antenna is a type of directional wire radio antenna used on the hf and vhf bands. There are no shortage of old school yagi guys who will come up with some arcane nonsense as to why a quad isnt that good, and that would be because they never had one. High performance cubical quad antennas 3rd edition by. A circular antenna is the best and has in a certain. Design and construction of a national contest journal. There really is not any new principles involved here, the quad works on the same principles as the yagi. About cubical quad for 20 meters w5dqv the resource is currently listed in in a single category.
If we look at antenna books and articles about quad antennas, we will often find references to quad antennas having 2 db gain over a comparable boom length yagi antenna. All about cubical quad antennas the famous handbook on quad theory, design, construction and operation addeddate 20180207 17. The cubical quad antenna likely got its name from the appearance of early 2 element versions of the array. A light and sturdy quad for 10 and 15 meters 1,555,418 bytes, pdf file qst july 1991, pp. Our wide line of fiberglass cubical quad spreader arms allows our customers to select the ideal spreader arm for its intended role. If so please store this link to amazon shopping as a. The cubical quad has the advantage of being not only multiband, but in my experience is equal to a 3 element yagi in performance. A fiveelement quad antenna for 2 meters by jim reynante. Several of you have asked for a plan of the 4 element quad that several of us have built. Summer contests are a great reason to get away from it all and enjoy the pleasures of amateur radio.
There are devices that will allow the tilting of the tower to the ground to work on a cubical quad antenna, rotator, or tower. Hamsphere is pleased to present the 7element diamond configuration cubical quad hf antenna series which is optimized for superb dx performance. Cubex currently offers cubical quad antennas for 70 centimeters through 40 meters. Cubical quad antenna construction you have to build it yourself, even though it comes as a complete color coded kit, thats just too difficult for you. I would like to build a quad antenna for 20 meters but i am limited for space and can not do a. The statement often made is a single quad element has 2 db gain over a dipole, and that 2 db gain difference carries over into arrays of quad. Fiberglass cubical quad spreaders maxgain systems, inc. Ei7ba multiband cubical quad antenna, ve3sqb ham radio. I was surprised to discover that the dimensions figure 1 cubical quads, like this one assembled by the author, can last a long time by using the proper construction techniques.
High performance cubical quad antennas 3rd edition by john. If you are limited in space a 2 elements quad could be what you were looking for. The characteristic impedance of a loop depends on its shape. The next type of beam is the cubical quad, my favorite. This monoband antenna is deployed on all hf ham radio bands on hs4. Figure 1 cubical quads, like this one assembled by the author, can last a long time by using the. The antenna is constructed using a 4way electrical conduit junction box and 34. I like to combine the vhf and field day events with camping so my antennas need to be portable. All about cubical quad antennasthe famous handbook on quad theory, design, construction and operation.
The windbreaks of glassfibre tubes are realized with isolating militarytype cables of very high quality. Using a spider quad, such as the gem quad, is one way to ad. This copy of the very popular paperback about quad antennas is in above average condition. Since its first introduction in the 1940s, the quad antenna has found uses in a number of areas. One of the best known books on construction of quad antennas. Horizontal or vertical polarization of an cubical quad antenna is determined by placement of the feed point feed gap on the driven element parasitic elements need to be mounted in the same orientation as the driven element. So in this case, we want to build an antenna for 6 meters, 50. This antenna does not need a 75 ohm transformer as quads do at lower frequencies. John koszeghy, k3bb exk2ob has had a love affair with quad beams for 45 years. The distortion was alarming but no permanent damage occurred.
It may be just the thing you and your radio need to provide a reliable communication link with the outside world. All about cubical quad antennas the famous handbook on quad theory, design, construction and operation. Remember 2 meter use quad s you want to be fed for vertical polarization because repeaters antennas are. Lowell, n1lo, 41698 ok, this is the plan you have been waiting for. High performance cubical quad antennas 3rd edition by john koszeghy, k3bb.
Giovannini elettromeccanica antenna systems for hf. It works by letting the quad loops swivel out of the way. Unlike past formulaladen methods of quad design, both element diameter. Indeed, he subtitles his latest volume with just those words. Since its first introduction in the 1940s, the quad antenna. Three element quad antennas typically have about 2 db more gain than a comparable size. Several of you have asked for a plan of the 4 element. The purpose of the calculator is to give you the needed sizing to construct a good multielement cubical quad antenna for amateur radio use. The main category is quad antennas resources that is about quad antenna, how to build a quad antenna for ham radio use. The first edition appeared in 1994, with a second in 1996. Building a fullwave quad loop antenna for 6 meters.
Many months were spent searching for the best model dimensions shown in various antenna handbooks, and information found on the internet. Quad hardware italian based company manufacturing quad antennas for ham operators and also selling quad parts for the do it yourself antenna builder. Vhfuhf quad antenna the information in this article has come from many amateur sources, the most notable was from wa6tey sk 1985 ray frost, who was a pioneer of vhf quad designs and one of the best southern california transmitter hunters of the 1980s. The cubical quad antenna lends itself to use at vhf and uhf, and a 2 metre quad or two meter quad is easy to make using a few items that are easy to obtain or may even be available anyway. The emcomm iii portable antenna is a portable high frequency hf antenna specially designed for short to long range portable and manpack hf comm. At the end of this article, i go into some detail as to how to finetune the antenna. A quad has a smaller turning radius that a yagi it has a lower noise level and a slight higher gain. Design and construction of a quad that will last steve root, kosr a 2element quad has fullsized elements. The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a tuning condition that will give maximum gain this spacing.
The history of the quad is succinctly told in the orr and cowan book on cubical quad antennas pp. The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a. All of our antennas are hand built with the highest quality materials available and should give you many years of service. Horizontal or vertical polarization of an cubical quadantenna is determined by placement of the feed point feed gap on the driven element parasitic elements need to be mounted in the same orientation as the driven element. Cubical quad antenna calculator in java script let you calculate elements size and. Some may not have the test equipment or knowledge to perform these tests. Unfortunately yagi antennas especially ones high on towers are susceptible to precipitation static. The statement often made is a single quad element has 2 db gain over a dipole, and that 2 db gain difference carries over into arrays of quad elements. The biggest compromise with a 2element quad is in terms of boom length element spacing. They do have more db gain then a comparable yagi but its on the order of about 1.
Sign up to our newsletter and get exclusive deals you wont find anywhere else straight to your inbox. This wellknown classic on quad theory, design, constructi. The cubical quad antenna consists of multiple squares placed one after another. Bcara 2m cubical quad antenna construction this antenna was designed with standard cubical quad formulas for 145 mhz to calculate the lengths of the wire elements but the antenna came out instead resonate closer to 146 mhz. Any length of a good quality rg58x will suffice as the primary feedline. This is no longer mentioned about the cubical quad in the arrl, but deserves mentioning. Cubical quad antenna antennas radios amplifiers baluns and. A quad is a 3dimensional antenna so maintenance can be difficult. Five band, two element quad for 20 through 10 meters oocities. A backpack antenna that is easy to put together in just minutes and parts store inside the boom making it ready for travel or storage. There is some slight wear on the outer covers but the pages are free of writing and marks. Cubical quad antenna antennas radios amplifiers baluns. The cubical quad antenna likely got its name from the appearance of early 2element versions of the array. A cubical quad with typical dimensions could have lower impedance than 100 ohms.
All the information i have seen so far lots of internet searching and arrl antenna book is for quads built at a full wave. The first square is the reflector, the second one is the driven element and all other squares are directors. This link is listed in our web site directory since thursday apr 17 2014, and till today cubical quad for 20 meters w5dqv has been followed for a total of 1241 times. Cubical quad for 20 meters w5dqv resource detail the. It is also something that you can construct yourself. Like a yagiuda antenna yagi, a quad consists of a driven element and one or more parasitic elements. All about cubical quad antennas, second edition is the book to buy if you are interested in a true highperformance antenna. However, the photos include quads up to 8 elements. Perhaps it is possible to build quads to stand up to heavy icing, but i doubt it is worth the trouble for antennas of the monster size discussed in this article. In building dozens of homebrew cubical quad antennas over the years, i personally have noticed a couple of things. Basically, i am going to mainly discuss the setup i used on my 4 element cubical quad. This calculator requires only the entry of the center of the frequency range your cubical quad antenna will be used at.
519 724 246 1043 297 1295 867 980 570 1261 1358 743 40 715 1452 25 394 521 1051 1122 595 948 943 14 313 425 489 780 1069 150 130 412