I used half inch cpvc pipe for the spreaders because it was. Specifically designed to work with yaesu model ft8900r radio. For 150 mhz one wavelength is 2 m, and the antenna. 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. I love quad antennas, i have a couple of home made ones for 6m portable work. Power splitter, antenna switch, phasing harness wifi. About 2m quad antenna the resource is currently listed in in 2 categories.
However, adding quad elements produces diminishing returns. Ok well start with a specification of my present quad 2 element. Xquad2m xquad antenna for 2m available here radioworld. Some of these clamps can be used to mount the directors. The main category is antennas for 2 meters band that is about antenna projects for 144 mhz. A quick lesson in geometry revealed that if an x configuration of. Combine two or four antennas by coaxial power splitters. A cubical quad antenna is a four sided, square version of a folded dipole. The main category is quad antennas resources that is about quad antenna, how to build a quad antenna for ham radio use.
Invest an afternoons work and pack this novel directional gain antenna. Figure 2drill out the rivets to remove the tvantenna pieces. I got the boom from a large uhf tv antenna that was 70 long. 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. The next highest gain antenna was an oliver swan later to become klm bandpass log periodic type yagi of. Pdf downloads click to download amateur radio g3txq commonmode chokes. With a twoelement quad, the element spacing for optimum reflector perfor mance is between 0. The antenna is basically a quad, 1 full wavelength at 2 meters. Ei7ba multiband cubical quad antenna, ve3sqb ham radio. This same antenna design won the antenna gain measurement contest in the category of highest gain for the shortest boom length.
Quoting from william orr, whereas parasitic beams having twenty or thirty parasitic directors are efficient, high gain antennas, it would. View and download diamond antenna cr8900a instruction sheet online. Bg for a four element cubical quad antenna for the 2 meters band. Most often used with a parasitic loop direct or and a parasitic loop. The quad antenna, sometimes called the cubical quad, is an antenna which is used by many amateur radio operators. The feed point is in the vertical plane of the antenna between the loops so its basic polarization would be vertical. The power splitter serves as an almost lossless transformer to adapt the 12. The simple 2m440 copper pipe j posted in vhf antennas can you use a pipe cutter or a hack saw, can you solder then here is how to build a simple j antenna that will more than double your 2 meter and even 440 performance. A fiveelement quad antenna for 2 meters by jim reynante. The 6 meter quad antenna gain in dbd over a dipole is therefore. They are especially designed for amateur radio, with the following characteristics. Hybrid double quad antenna 2m double quad antenna amateurradio 2m antenna for amateurradio, hamradio 2mband vhf frequency 144.
If mounted on a guyed tower break up the guys every 3 feet by using egg insulators in the guy line for the top 20 feet of the guy cables. An 8l or larger 2m quad is a very unusual item since after the reflector and the driven element, the other loops directors dont provide any advantage over linear straight directors, and linear directors are a lot less work to build. The x quad is an improved design of the well known multi element quads. Hybrid double quad antenna 2m 2hdq5 ham radio antenna. The k4mmg 2 meter quad construction tips for building better quads graphic intensive allow time to load 2 meter 2 element quad shown mounted above another antenna with coax feed nearest you on left spreader rod. Now the problem was how to support the square loops. 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. If you want to further tune the antenna, the mounting point of the center conductor has an effect on the rf resistance of the antenna. In 1947, cubical quads began gaining popularity with amateur radio operators. Remove antenna from package and inspect contents to insure it is complete. Cheap yagi antennas for vhfuhf by kent britain, wa5vjb download practical antenna design yagi uda antenna model yg 23 quad rectangular or diamond shaped fullwave loop antenna. Many antennas are based on halfwave dipoles fabricated from wire or tubing. The feed point is usually placed at the centre of the dipole, for although this is not absolutely necessary, it can help prevent. This fiveband loftmounted antenna has been used at two locations with great results.
A simple 4 element 2 meter yagi made from coathangers or. 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. You can download mininec3 from several sources in the amateur ra. This chapter, by chuck hutchinson, k8ch, covers theory and construction of antennas for most radio amateurs. The phasing stubs visible below the boom can be discarded. Quad antenna javascript calculator for cb and amateur. It should be remembered when considering its use that the quad, when fed at the bottom gives horizontal polarisation.
The fact that the quad antenna is effectively a pair of stacked dipoles, it offers a lower. Pdf two element array of dipole antennas with 90 degree phase difference feed is proposed for. The boom utilized is a square 114 white vinyl railing balusters made by fiberon pn 44551 and found at lowes. Innovantennas use the very latest in electromagnetic computer design technology in conjunction with particle swarm optimisation methods considered to be the best in optimisation technology today to produce some of the most innovative and high performance antenna solutions available today exclusive designs from some of the worlds top antenna designers have been turned into professionally. Quad antenna design is intended to help amateurs, students or engineers in their telecommunications development. Download quad antenna design assists users in designing quad antennas with an integrated calculator that helps enthusiasts properly place the hardware device to receive the best signal available. 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. There are some horizontal characteristics common to all quad type. It is used by radio amateurs on the hf and vhf amateur bands. The xquad is an improved design of the well known multi element quads. I have used 5element 2 meter quad, a pair of 220 quads, and a pair of 2 meter quads on my california station for 10 years.
In dealing with both antenna theory and radio wave propagation, a theoretical. Antennas for ham tv, jim andrews, kh6htv video application note, an4, sept. This link is listed in our web site directory since monday apr 4 2016, and till today 2m quad antenna has been followed for a total of 2080 times. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2, to maximize performance. 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. This gave me a guess at how many elements i could fit on the boom that i had. Pdf two element phased array dipole antenna researchgate. The x quad 144146 mhz antenna is an improved design of the well know multi element.
A quad antenna is a type of directional wire radio antenna used on the hf and vhf bands. 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. Heres what we did and how you can build a twoelement, lightweight 10 and 15meter quad using parts availa ble at local hardware and radioparts stores and a sportinggoods mailorder supplier. About 144mhz cubical quad the resource is currently listed in in 2 categories. Pdf quad band planar inverted f antenna for smart phone. Part of a wavelength on top and part on the bottom in the form of two loops connected together. The simple 2m440 copper pipe j iw5edi simone hamradio. It features extremely high forward gain, a clean radiation pattern and an excellent fronttoback ratio. 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.
Summer contests are a great reason to get away from it all and enjoy the pleasures of amateur radio. Enter center frequency to be calculated for a quad. Hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. A 3element cubical quad has more gain than a 3element yagi. Dxantenna project in the summer of 1987, we soon discovered the real challenge. Here youll find simple verticals and dipoles, as well as quad and yagi projects and other antennas that you can build and use. Contents introduction to the fourth edition ix 1 introduction to radio broadcasting and communications 1 2 radiowave propagation 5 3 transmission lines 59 4 the smith chart 95 5 fundamentals of radio antennas 123 6 highfrequency dipole and other doublet antennas 141 7 vertically polarized hf antennas 173 8 multiband and tunablewire antennas 203 9 longwire directional antennas 2. The vhf dipole antenna at vhf and uhf, most antenna systems are derived from the dipole or its complement, the slot antenna. Download a pdf document for xquad antenna for 2m xquad2m. Example a 200m outside antenna range was set up to operate at 2 ghz using a 2m. You can see that when erected in a straight line the dipole is quite directional. The dimensions shown in figure 2 produce a radiation pattern with low sidelobes and. That works out to about 12 and 16 inches 305 and 406 mm at 2 meters.
Build an optimum spaced 2 meter quad backwood realm. The cubical quad beam antenna offers about 2 db over a yagi of a similar length. Friis, antenna theory and practice, wiley, new york, 1952. The antenna that is below the quad is a 6 meter moxon that is made from tv tray legs. Like a yagiuda antenna yagi, a quad consists of a driven element and one or more parasitic elements. I started with an already modeled 15 meter 2 element quad, and rescaled it to 146mhz. Even though the publication of the first works dl6wu yagi been more than 30 years, his approach yagi antenna pin xquad antennas wifi umts3g gsm antennas, radio amateur antenna. Quad band planar inverted f antenna for smart phone. The gamma match on the 2m quad can be avoided by careful work in eznec, if the dimensions can be tweaked to obtain a feed impedance around 50 ohms it just needs a choke balun on the feeder or if its near 100 ohms a quarter wave of 75 ohm coax will. It uses a single coax line to a homebrew antenna switch. When leaving california i gave all my antennas to wb6adc sk 2001 clark harris, another great so calf transmitter hunter. But when erected as an invertedv you gain a couple of spoints 10 12db in the.