The pattern of left is for a two element 20meter quad 35 feet high 12 wave high. The antenna is basically a quad opened up on the bottom. With the advent of modern computer software, it was discovered that yagis, quads, and other normally nonresonant antennas could be matched to 50 ohm coax, by changing the sizes and the spacing of the elements. Antenna calculator calculate your dipole, 3 element yagi etc find the length of a dipole. 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. I am also a big fan of quads, my low band quad is a old hy gain hy quad i purchased in the late 70s and is still going strong today. The actual size of element that you end up with usually after hours of adjusting, measuring and testing,will depend on a few different things, such as type of wire, wire diameter, insulated or non insulated, etc. 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.
The purpose of the calculator is to give you the needed sizing to construct a good multi element cubical quad antenna for amateur radio use. Yagi uda antenna calculator you may want to combine it with a folded dipole. 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. In this menu, you need to submit values of multiple. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. Using this software, you can design and build your own yagi antenna. The inherited wisdom for element size is 1005f for the driven elements, and 4% to 5% larger for the reflectors. Cookie policy delivery information terms and conditions.
This page covers 3 element yagi antenna calculator. This link is listed in our web site directory since wednesday apr 24 20, and till today quad antenna calculator has been followed for a total of 1017 times. Quad antenna javascript calculator for cb and amateur. Here we have collected some links to building instructions for 11m antennas on the internet. Many model ti7140 handheld calculator and the above formulas. Verticals covers all the common types with a coil calculator built in for the antennas that require them.
This calculator requires only the entry of the center of the frequency range your quad antenna will be used in. Avanti antennas produced a little quad called the pdlii. The width of any antenna boom is included within the length of each dipole element, as one would do for any ordinary dipole or yagiuda antenna. Four element 2 meter quad antenna by erk werner kd5ctj spring of 2000. Five band, two element quad for 20 through 10 meters. The distance between one point to another adjacent point in a wave is known as the wavelength. 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. 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. With the advent of modern computer software, it was discovered that yagis, quad s, and other normally nonresonant antennas could be matched to 50 ohm coax, by changing the sizes and the spacing of the elements. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. It is used by radio amateurs on the hf and vhf amateur bands. The calculators for other antenna types such as parabolic,horn,dipole and patch are also mentioned. Serious results can be expect when you have a 4 elements yagi, in most cases all what the bigguns are working you will be able to hear and work the dx as well.
Quad antenna design is a program dedicated to a very special kind of. If you want to use it between 144mhz and 146mhz enter 145 in the mhz box. This software can not only be used to design but also to find out antenna gain, stacking distance, and standing wave ratio swr. Like a yagiuda antenna yagi, a quad consists of a driven element and one or more parasitic elements. Durable easy to build 4 element 6 meter quad created by steve, wa8ueg on 20804. 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. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2, to maximize performance.
This calculator requires only the entry of the center of the frequency range your cubical quad antenna will be used at. A javascript to calculate the dimensions for a seven element yagiuda. The main category is quad antennas resources that is about quad antenna, how to build a quad antenna for ham radio use. A report on a four element 2 meter quad antenna by erk werner kd5ctj. 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. Free online engineering calculator to find the dimensions of a yagi uda antenna for a given frequency range and length. Above mentioned you can see the schematic diagram not drawn to scale. Order practical antenna handbook with cd rom by joseph j. It is quite possible, that other calculators deliver slightly different results.
Click on calculate to display the critical antenna measurements in both inches and centimeters. If using it as a portable antenna each element can be quickly identified without having to measure. The fifth element, is the third director d3, it is 296. This quad,fed by 2 coax lines, was able to work both vertical and horizontal. I like to combine the vhf and field day events with camping so my antennas need to be portable. Jul 14, 2014 hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. But better is to put a system on your mast like a g600 or an equivalent and a heavy duty 4. This software can not only be used to design but also to find out antenna gain, stacking distance, and standing wave ratio swr to design the antenna, you need to go to task design yagi menu. Uhf quad antenna calculator revisiting rectangular loop. This calculator will help you to calculate the different wavelength of antennas based on the frequency. The pattern of left is for a twoelement 20meter quad 35 feet high 12 wave high.
Built a 4 element quad for 11 meters in the late 70s. Its coinductive secret was that it used a folded dipole to feed the quad. Summer contests are a great reason to get away from it all and enjoy the pleasures of amateur radio. The characteristic impedance of a loop depends on its shape. This gave the antenna more gain than a simple quad. The 2element quad has almost the same gain as a 3element yagi. About quad antenna calculator the resource is currently listed in in 2 categories. The 2 element quad has almost the same gain as a 3 element yagi. 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 inherited wisdom for element size is 1005f for the driven elements, and 4 % to 5% larger for the reflectors. Enter center frequency to be calculated for a quad. A circular antenna is the best and has in a certain.
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. Cubical quad antenna js calculator iw5edi simone hamradio. Both quiet and efficient, the quasar quad experience has lower noise than a traditional yagi antenna due to its fundamental tube design. Building and experimenting with antennas can be an interesting part of the radio hobby. Quoting from william orr, whereas parasitic beams having twenty or thirty parasitic directors are efficient, high gain antennas, it would. The optimum gain of any antenna with parasitic elements varies with the spacing and tuning of the antenna s elements. The gain is always less than a yagi with equivalent numbers but other factors still make it the better choice in my opinion. A quad antenna is a type of directional wire radio antenna used on the hf and vhf bands. Cubical quad antenna javascript calculator for cb and amateur radio. A fiveelement quad antenna for 2 meters by jim reynante.
The most popular book on antennas ever written, widely known as the antenna builders bible, joseph j. Free online engineering calculator to find the dimensions of a yagi uda antenna for a given frequency. Building a 4 element cubical quad iw5edi simone hamradio. Light 4 element can still be used with light rotators like channel master although their life is reduced with extra bearings this again is length. Yagi calculator is a free antenna design and analysis software for windows. Calculate safety distance from your antenna icnirp is a calculator software that. 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. This calculator is designed to give the critical information of a particular beam antenna, in this case a seven element yagi, for the frequency chosen. Antenna, ve3sqb ham radio antenna design software programs.
The actual size of element that you end up with usually after hours of adjusting, measuring and testing,will depend on a few different things, such. The optimum gain of any antenna with parasitic elements varies with the spacing and tuning of the antennas elements. Heres a solution with two alternatives for construction. This calculator will help you to calculate the different wavelength of. A fiveband, twoelement quad for 20 through 10 meters want a small antenna that covers al the ham bands between 14 and 29. A 3element cubical quad has more gain than a 3element yagi. This quad, fed by 2 coax lines, was able to work both vertical and horizontal. When i built my 2element quad, i used the calculator on the ultimate guide site, and the antenna resonated at the design freq with less than 1 trimming. Durable easy to build 4 element 6 meter quad or 6n2 or 4 element 6 and 5 element 2. However, adding quad elements produces diminishing returns.
Why is it time for you to purchase a quasar quad antenna from radiowavz. Quad antenna javascript calculator for cb and amateur radio. The gain of an an antenna with parasitic elements varies with the spacing and. Hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. There are many reasons you should considering building your own antenna. The formula and basics of yagi antenna calculator are also explained with example. A 3 element cubical quad has more gain than a 3 element yagi. Cubical quad antenna calculator in java script let you calculate elements size and. With the 4 elements yagi we come on a point when we must pay serious effort to our mast and rotating system. Enter the desired frequency then click on calculate and the optimum values for that combination will be displayed in feet, inches and fractions of inches, and in meters. Some are based on lookup tables, some completely hide their algorithms. Download quad antenna design assists users in designing quad antennas. I want to build the 4element, get it in the air, and use it without a lot of tweaking and unnecessary bs, and i will probably use the ug figures for the other 2 elements.
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