Fyi this was many years ago for a science fair i entered. Online calculator folded dipole calculator changpuak. This calculator will help you to calculate the different wavelength of antennas based on the frequency. After completing the basic assembly of the collinear antenna, apply a small amount of rf with the antenna on the floor or ground.
Building a coaxial collinear antenna discussion vertical antennas with gain are usually pretty tough to build utilizing tools found around the average home. The initial geometry of the designed antenna can be classified as a planar inverted f antenna, pifa 5,6,7,8, which consists of a monopole antenna running parallel to a ground plane and. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. The proposed shielded stripline collinear antenna can be applied to other frequency bands by scaling up or down the size. About build a 9db, 70cm collinear antenna the resource is currently listed in in 2 categories. Hustler g6270r, g6270r, 2m70cm 6db collinear vertical. Here is a photo of a completed antenna and radome before final assembly. This article describes a collinear antenna made from very inexpensive rg58u coaxial cable and encased in pvc pipe. The internet is a good source for yagi antenna design. Make sure to poke a few small holes or notches in the spacer to allow the end of the antenna to breathe. As i am not aware of any amateur radio allocation in the immediate vicinity of 1. A vertical collinear aerial is equally sensitive 360 around the aerial in the.
The original antenna obtained with the adsb receiver airnav radarboxpro is so great product that it is hard to build a better home made omnidirectional antenna with a higher gain than the original one. I had a problem with my packet radio station and decided that antenna gain was the solution. I currently use only wire antennas which work fine on 40 and 80 meters, but on the higher bands, i need some gain. We fabricated two identical jpoles using the dimensions in this document, and both of them performed quite well, with a resonant frequency toward the lower end of the 2meter amateur band and a vswr of 1. The main category is antennas projects for 432440 mhz that is about antenna for 70 cm 432440 mhz. G6270r hustler g6270r 2m70cm 6db collinear vertical. I was trying to increase the overall performance of the jpole, in this design. The antenna is a series fed collinear which is housed in a heavy duty tapered fibreglass radome, fitted to a ruggedised alodined aluminium mounting tube.
Mar 16, 2018 making an inexpensive 1090mhz adsb collinear antenna duration. Now its time to add the additional elements to the top and bottom of the collinear array. The below image is the measurements of the antenna. A collinear antenna is an array of dipoles, made up of as many elements as you want, then fed straight into the receiver. This is a simple and quick design for a collinear antenna. In their simplest form, dipole antennas for 2m and 70cm can be constructed. The swr will be much lower once the antenna is mounted in the air.
This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. The coaxial collinear is rarely mentioned in radio circles, odd. Alternatively, for permanent installations, the copper tube or aluminium. A coaxial collinear antenna for 70 cm this coaxial collinear antenna was built to test for my own consumption whether or not this antenna method actually works. Coax collinear antenna dimension calculator back to antenna calculator overview. You have to squash the pattern somewhere to get the higher gain.
The distance between one point to another adjacent point in a wave is known as the wavelength. Build a 9 db, 70cm, collinear antenna from coax, mike martell n1hfx. Dont forget the driven element red is cut in the centre. Amateur radio antenna sold here,we update our stocks to keep in touch with modern improvements in antenna design, ham radio shopping. If the swr is greater than 2 to 1 across the entire band, a connection may. The term colinear simply means, in a straight line. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. Collinear antenna building, by karl shoemaker, ak2o. A slimjim antenna is quite popular but only realises about 1. Tape the toroids to the proper point on the coax using electrical tape or similar means. However, to extend the reception range and quality and this generally applies to all radio reception theres a special antenna called a collinear which is tuned to the wavelengthfrequency of adsb transmitted by aircraft. Antenna pattern is omni directional very high gain and low to horizon radiation angle. In this paper, a new type of collinear microstrip patch antenna compa 6 that can operate with tm0x mode is. I used cables with the low losses belden h with the losses 12 db100 m at 900 mhz for the 12 elements corpus of the coaxial collinear antenna and trilan 240 with the losses 23 db100 m at.
Remember to use good quality coax from the antenna to the shack. This antenna features a peak gain of 6 dbi, and has a matte black finish and a black chrome rptncm rf connector for low visibility while deployed. Enter the required frequency in mhz, the velocity factor of. Hard to construct matching coils are normally needed as well as hardware and tubing which can be difficult to find. Mount the antenna to a pole making sure to clamp the antenna to the mast at a point below the decoupling sleeve area. The collinear dipole antenna consists of two or more 12 wavelength sections separated by a 14 wave phasing stub in the form of a coil. I have had good success with both, but regularly use the balanced feeder slim jim mounted on a 9m fibreglass pole, as can be seen in the photo at the bottom. This page documents a build of a 2element 12 wave collinear jpole performed by harry, kc9eot, and myself, kb8ojh. Recently the rason technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. Great for locations where visual impact is a problem, this antenna gets you on the 4 most popular vhf bands.
At home i use the shipplotter software because it makes it simple to download data to other. Here is a nice small home base antenna for 6m4m2m and 70cms, also it would be ideal for portable work. Our extensive range of collinear antennas is available in traditional frequency specific designs and feature our patented broadband low pim pcb based meander and. Unlike the coax collinear, the dipole version requires a groundplane to operate. A collinear or colinear antenna array is an array of dipole antennas mounted in such a manner that every element of each antenna is in an extension, with respect to its long axis, of its counterparts in the other antennas in the array. To do the antenna takes a half of hour and to tune the antenna also takes a half of hour. May 06, 2020 a collinear antenna, also called colinear or collinear antenna array, is a set of dipole antennas aligned along their length so they form one long line. Hi, i have been searching the internet for instructions on making a 70cm collinear antenna but all i keep coming accross is instructions on how to make one from coax cable, i dont want to make it from coax cable as i am looking to make it from lengths of copper wire and use phasing coils. The boom, plastic inserts are all from a broken tv antenna.
It can be made from any common copper household electrical wire. Antenna collineare omnidirezionale ad 8 dipoli per i 2. Collinear antennas category is a curation of 21 web resources on, homebrew compact 6dbi collinear antenna, collinear antenna building, build a 9db, 70cm collinear antenna. Obtaining 3db gain by doubling the number of collinear elements from one to two requires a significant size increase over doublesize. Collinear antennas are available in standard aluminium, ruggedised and stainless steel versions. One of the members commented to me that i should write an article about collinear arrays so that we could all build our own. Some of these are real, while others are either imagination or over blown facts. Because the middle of the dipole element is electrically. Properly aligned and phased, a collinear array can provide a 3 db or more increase in signal strength. Collinear coaxial antenna design calculator jeroen steeman. Omnigain vertical collinear for vhf and uhf coax comes alive ii, the next generation by mike collis wa6svt original article appeared in the august 1990 issue of 73 amateur radio magazine. Sample of article summary unwinds build a 9db, 70cm collinear antenna.
Diamond antennas make great vertical antenna for 2m 70cm 6m, high gain antennas made from the best materials made to last and the market leader in ham radio antennas,we sell diamond antennas at the best prices. Wb3ayw and kk1cw vhfuhf collinear j pole with short. This link is listed in our web site directory since tuesday jul 11 2006, and till today build a 9db, 70cm collinear antenna has been followed for a total of 30309 times. Relatively low swr should be observed at this point. Sep 06, 2015 there are lot of common beliefs about making a coaxial collinear antenna. A collinear like this applied to 40 meters would be 440 feet in height. Pg1ns ham radio site 2m projects omnidirectional antennas. Hustler g6270r, g6270r, 2m 70cm 6db collinear vertical. Diamond antennas make great vertical antenna for 2m70cm6m, high gain antennas made from the best materials made to last and the market leader in ham radio antennas,we sell diamond antennas at the best prices. The col17 is suited for broadband and duplex applications designed to cater for transmit to receive separations of up to 5. Build a 9 db, 70cm, collinear antenna from coax by n1hfx. The original ed fong dual band vhfuhf 70cm2m jpole pvc pipe antenna. The radiation angle of the collinear will be low and narrow. Many improvements have been made since my original article omnigain collinear for 70 cm and 23 cm.
Cebicks web site, i thought a 4element colinear wire antenna might be useful for my station. Enter the required frequency in mhz, the velocity factor of the coax if known and antenna designer will calculate the dimensions of. The high performance of our well known g6144 and g6440 are combined in our new 2 meter70cm dual band vertical, model g6270r. The antron 99 is a loaded 12 wave over a loaded 14 wave, variable mutual anyone would know this if transductance tuned vertical antenna all they did was read the advertising. All used coaxial cables have impedance 50 ohm and preamplifier has also 50 ohm input and output impedance. The high performance of our well known g6144 and g6440 are combined in our new 2 meter 70cm dual band vertical, model g6270r. This 50ohm impedance antenna, when fed with 25100w of ssb rf at 435mhz, makes reaching amateur satellites such as ao40 and ao10 a snap. Mar 08, 2014 however, to extend the reception range and quality and this generally applies to all radio reception theres a special antenna called a collinear which is tuned to the wavelengthfrequency of adsb transmitted by aircraft. Wb3ayw and kk1cw vhfuhf collinear j pole with short spaced. The calculator program available for download to design this antenna is in xls spread sheet format and requires that you have a program that will read xls spread. Antenna design calculators category is a curation of 83 web resources on, parallel.
A these are a few of the modifications i came up with. In my page you will find several details of manufacture, additional. Although only a 70 cm antenna was described in this article, the formulas can be easily calculated for the 6 meter, 2 meter. While it is not always feasible to homebrew a commercial quality antenna designed to take hurricane force winds, it is very feasible to built a collinear. The measurements below are for building a simple dipole antenna. A length of coaxial cable radiates negligible amount of rf. If you want to put this thing outdoors, do not use brass, as it gets brittle.
Any antenna using 2 or more discrete elements, stacked one above the other is a colinear array. Alternatively, for permanent installations, the copper tube or aluminium jpole is a good choice. The calculator program available for download to design this antenna is in xls spread sheet format and requires that you have a program that will read xls spread sheet files. Homer you know what you are doing, you a home brewer of antennas and have indepth knowledge of antenna theory. If you prefer, apply rf to the antenna at this point and slide the toroids up and down until minimum swr is found.
Pg1ns ham radio site 70cm projects directional antennas. A coaxial collinear antenna for 70 cm user web pages. I was able to get more by using a pair of endfed 12wave antennas. There are lot of common beliefs about making a coaxial collinear antenna.
Dont drill too far into the spacer or use screws long enough to damage the feedline. Collinear antenna phasing coil calculator and construction. Model dp2 is also used as a basic driven element for high gain yagi and collinear antenna designs. Co linear antenna design while it is not possible to homebrew a commercial quality antenna, it is very feasible to build a collinear antenna for average use. Magnetic loop antenna calculator spreadsheet excel spreadsheet that. Instructions are included below for building the antenna in an example for 147. Pdf collinear and coparallel principles in antenna design. Quad band 6m4m2m and 70cm colinear tony allen ei4dib. This calculator will help you to calculate the different wavelength of.
The uhf collinear range of collinear antennas has been reengineered and features higher power ratings and improved construction. This page shows a 7 element, yagi beam antenna built out of spare parts for the 70 cm band. High gain collinear ais 162mhz receiving aerial ais decoder. Calculate the required dimensions for a coaxial collinear antenna construction for any given frequency. Build a 9db, 70cm collinear antenna resource detail. Performs well and can be used for rx and tx purposes.
Many improvements have been made since my original article, omnigain collinear for 70 cm and 23 cm, was first published in the may 1982 issue of 73 magazine. All mentioned col linear antenna arrays have nearly omnidirectional radiation pattern due the more or less longitudinal axis symmetry. The original antenna was a diamond v2000 2m, 70cm and 6m colinear and i found this worked just as well. Pdf collinear microstrip patch antenna researchgate. Uhf collinear collinear base antennas rfi wireless. Uhf yagi is based on dl6uw yagi antenna s designformula. It can produce similar results to a commercial version and be made from scraps of coax. Its a good choice for repeater installations and can be.
It is not particularly difficult to make a vhf antenna with omnidirectional properties as well as having a 6db gain. A little while ago about 6 years to be exact the best antenna i had for 145mhz was the 14wave magmount antenna on the roof of my car. Homebrew 2m coaxial collinear vertical worldwidedx radio. No idea what the gain is though and so far only managed a single 70cm contact with it to the local repeater to test it. Build a 9 db, 70cm, collinear antenna from coax by n1hfx recently the rason technical committee was hard at work at the repeater site repairing our 2 meter repeater antenna. For an antenna with more gain you can add sections, and make it longer. Cheap and simple t2ltcoax dipole antenna for cb radio part one remake from earlier video duration. Just saying i do not see how a coaxial collinear can have 30 db of gain, my cushcraft element yagi only has 15. A the diagram provided is a more simplified version of the one i did. A and, i also added a short aluminum mast that fit. I decided to start this thread to find out the truth.
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