About 144mhz cubical quad the resource is currently listed in in 2 categories. Home antenna cubical quad antenna javascript calculator. All models are built using only the finest materials available, including but not limited to cast aluminum alloy spiders, and only the finest quality fiberglass spreader arms. If anyone has or knows of the article this came from, i would like to know. Actually, i shall divide the material into 3 sections. Cubex currently offers cubical quad antennas for 70 centimeters through 40 meters. Enter center frequency to be calculated for a quad. Please see my other listings for different sized quads. The main category is quad antennas resources that is about quad antenna, how to build a quad antenna for ham radio use. Both quiet and efficient, the quasar quad experience has lower noise than a traditional yagi antenna due to its fundamental tube design. The most popular book on antennas ever written, widely known as the antenna builders bible, joseph j. Antenna system evaluator this javascript program evaluates the performance of your antenna system.
Cubical quad antenna js calculator iw5edi simone hamradio. In the late 1960s i built a 3band 2element boomless cubical quad out of bamboo poles and a wooden hub. Why is it time for you to purchase a quasar quad antenna from radiowavz. It is used by radio amateurs on the hf and vhf amateur bands. A fiveelement quad antenna for 2 meters by jim reynante. Apr 19, 20 this is the introduction of 2 element cubical quad antenna for 6m band. Quad antenna calculator building a 4 element cubical quad antenna. Quad are been joined toghether so to strengthen the whole system, the mart boom lenght supporting elements originally was 33 feet, it has been lengthened to 47 feet, due to the necessity of guying 40m. The sixth element, is the forth director d4, it is 295. Most parts are available on the world wide web or at some larger hardware stores. The antenna is basically a quad opened up on the bottom. This is the introduction of 2 element cubical quad antenna for 6m band. I started with an already modeled 15 meter 2 element quad, and rescaled it to 146mhz.
This is a different way of using pvc pipe to build a 2 meter cubical quad antenna. Five band, two element quad for 20 through 10 meters. This listing is for a 4 element cubicle quad antenna for 2 meters. This gave me a guess at how many elements i could fit on the boom that i had. The gain of an an antenna with parasitic elements varies with the spacing and tuning of the.
Detailed instructions about a home made 2 element quad antenna made in diamond configuration. A quad for internal use can be made quite simply by constructing a simple wooden frame. Pictures of a 2 element cubex quad antenna at a height of 1. A quad has a smaller turning radius that a yagi it has a lower noise level and a slight higher gain. Carrs practical antenna handbook, third edition is a work for anyone, ham radio operators, shortwave radio listeners anyone with an interest in antennas, from the newest of novices to the. 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. This calculator requires only the entry of the center of the frequency range your quad antenna will be used in. 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. Antenna design calculators, rf calculators educypedia. This twoelement cubical quad antenna is designed for use on either the 10meter ham band or the 11meter citizens band.
Excellent choice 144 mhz to 146 mhz low noise wideband yagi antenna for 2 meter band. Building a 4 element cubical quad iw5edi simone hamradio. Just copy and paste the below code to your webpage where you want to display this calculator. This 3 element 2 meter quad design has a major plus going for it. Cookie policy delivery information terms and conditions. The fifth element, is the third director d3, it is 296. I added late 1998, 2 elements cubical quad full size for 40m. However, adding quad elements produces diminishing returns. There is no way that i would be able to cut wires and drill holes to this kind of accuracy, so i.
Click on calculate to display the critical antenna measurements in both inches and centimeters. Hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. If you want to experiment with the design program, see details below. The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given. A 3 element cubical quad has more gain than a 3 element yagi. Jul 22, 2015 this is a different way of using pvc pipe to build a 2 meter cubical quad antenna. Same boom length, same height 35 feet above ground. Cubical quad antenna javascript calculator for cb and amateur radio communications. When all was said and done, my swr readings were 1. Below you can find the dimensions for a 3el cubical quad. Cubical quad antenna calculator in java script let you calculate elements size and.
The optimum gain of any antenna with parasitic elements varies with the spacing and tuning of the. Higher gain the 2 element quad has almost the same gain as a 3 element yagi. A fiveband, twoelement quad for 20 through 10 meters want a small antenna that covers al the ham bands between 14 and 29. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. If we were to construct a similar bent wire standalone dipole, it would work with slightly modified characteristics in comparison to a straight wire dipole. When i rescaled the antenna with eznec, the spacing and lengths were calculated out to about five digits. A circular antenna is the best and has in a certain. The cubical quad beam antenna offers about 2 db over a yagi of a similar length. Quad horizontal polarization using mmanagal free software duration. The pattern of left is for a twoelement 20meter quad 35 feet high 12 wave high. Oct 09, 2019 a typical 2 element triband hf cubical quad antenna. Dec 24, 2014 home antenna cubical quad antenna javascript calculator. A new trend in antenna modeling software is to build antennas that are resonant. Building and experimenting with antennas can be an interesting part of the radio hobby.
This means that the quad compares to a pair of stacked yagis as there is always some loss in the feed arrangements for stacking the two antennas. I can only give relative measurements however, using a home brew field strength meter on 2 meters and 70 cm, the antenna shows considerable forward gain antenna pointed at fs meter, strong deep nulls to the sides, and good nulls from the rear. A quad element is really just two bent 12 wave elements stacked one above the other. However, the tuning and matching may interlock to some extent, and it is usually necessary to run through. 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 prototype for 2 meters made its first contact of over 200 miles while lying upside down on a picnic table. I have been developing a dual polarity, 4 element, cubical quad for use on the 2 meter band. If tuning gap is present on the parasitic elements, doesnt the placement of this gap effect the polarization. It is easier to build a multiband cubical quad antenna, than a multiband yagi antenna. It was a great antenna and i would like to duplicate it.
Antenna, ve3sqb ham radio antenna design software programs. Lets look at a two element quad compared to a two element yagi at various heights. The resource is currently listed in in 2 categories. This up and over, over and down design had been used in hf wire antennas. There are many reasons you should considering building your own antenna. The pattern of left is for a two element 20meter quad 35 feet high 1 2 wave high.
A 3element cubical quad has more gain than a 3element yagi. Higher gain the 2element quad has almost the same gain as a 3element yagi. My reference antenna was the 14 wave whip on my ht, with an added tiger tail counterpoise. Figure 8 shows a commercial 4 element quad available in the netherlands. The optimum gain of any antenna with parasitic elements varies with the spacing and tuning of the antenna s elements. The impedance of the driven element also varies with the tuning and spacing, and thus the antenna system must be tuned to its final condition before the match between the coax and the antenna can be completed. Like a yagiuda antenna yagi, a quad consists of a driven element and one or more parasitic elements. Ei7ba multiband cubical quad antenna, ve3sqb ham radio.
Jul 28, 2017 2 meter antennas for directional, semidirectional, the web site below contains a free download software tool for designing a directional yagi antenna on 2 meters. Best quality 2 meter stationary or portable yagi antenna pa14483b. As you can see, the cubical quad antenna has the same gain as a yagi with one more elementbecause the driven element of the quad has more gain than the yagis driven element 2db more. Order practical antenna handbook with cd rom by joseph j. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2, to maximize performance. Heres a solution with two alternatives for construction.
I used half inch cpvc pipe for the spreaders because it was. Here we have collected some links to building instructions for 11m antennas on the internet. A typical 2element triband hf cubical quad antenna. I have been inactive for the last 25 years and now i want to get back big time.
The fact that the quad antenna is effectively a pair of stacked dipoles, it offers a lower. First you can taylor it to the needs of your communication local or dx and optimize it for the frequency you talk on and to the needs of your environment make it strong if you live in a harsh one where ice and wind is a problem. Horizontal or vertical polarization of an cubical quadantenna is determined by placement of the feed point feed gap on the driven element parasitic. 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.
The antenna has a total boom length of 4,21 meters and produces a 9,5dbi gain. A quad antenna is a type of directional wire radio antenna used on the hf and vhf bands. As a result of a number of requests that i have received for models of quads from my files, i thought that i might make a batch available all at once. The strongest signal produced from northern australia is from 43tr299 the 3 element above is the reason why. Many model ti7140 handheld calculator and the above formulas. If you are limited in space a 2 elements quad could be what you were looking for. Lets do a simple eznec pro4 demonstration of a simple 2 element cubical quad versus a yagi antenna. Each element is made up from a cross of available wood approximately 12. The quad antenna, sometimes called the cubical quad, is an antenna which is used by many. Well in the early days of amateur radio nearly everything was matched by either, a gamma match, beta match, hairpin match, 75 ohm 14 wave coax match, or one of a few hundred other home made matching devices. The characteristic impedance of a loop depends on its shape. The design is really quite simple and easy to make but it may take a little practice to get just the right square shape for the wire element.
I got the boom from a large uhf tv antenna that was 70 long. This listing is for a 8 element cubicle quad antenna for 2 meters. 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. In the late 1960s i built a 3band 2 element boomless cubical quad out of bamboo poles and a wooden hub. Instead of an x style spreader this antenna uses an h shape spreader. Nec2 based antenna analysis software for the amateur and professional. Dec 24, 2010 my reference antenna was the 14 wave whip on my ht, with an added tiger tail counterpoise. Cubical quad antenna calculator resource detail the dxzone. The optimum gain of any antenna with parasitic elements varies with the spacing and tuning of the antennas elements. This calculator requires only the entry of the center of the frequency range your cubical quad antenna will be used at. This link is listed in our web site directory since thursday jul 30 2009, and till today 144mhz cubical quad has been followed for a total of 5403 times.