The cpole is a resonant antenna, whereas the hpole is non resonant and must be matched with a tuner. The dualband openstub j pole antenna built out of heavy duty 316 angle aluminum, uhf so239 connector with 38 aluminum elements and all stainless steel hardware. So a success with the coax fed half wave vertical antenna which was now being called a j pole. Other very good j antenna designs published in 73 magazine have been. All pole locations shall be evaluated and approved by company prior to antenna installation. Zerofiveantennas multiband groundplane vertical antenna installation tips manual this manual is for models 630, 1040 and 1780 meter gp verticals unpacking your vertical your vertical comes shipped in 1 carton with 4 packs inside for models 1040 and 1780.
A j pole is a 12 wave vertical with a 14 wave matching stub. The j pole antenna, also called the zepp antenna short for zeppelin, was first invented by the germans for use in their lighterthanair balloons. Several functions for making azimuthal and polar plots of antenna and array gain patterns. The j pole and other endfed hertz antennas are prime examples of antenna that can have severe feed line common mode current problems. Pcaad polar and rectangular pattern plotting routines can read these files, with. Design of microstrip antennas and arrays, ieee press, new jersey, 1995. This is the same material used to make cake boxes and the gift boxes used for shirts and blouses.
All structured data from the file and property namespaces is available under the creative. True plumbers delight for 2 meters an all copper j pole. I built one of these myself and seems to work quit well. Super jpole antenna this antenna was developed by the independent repeater association in des moines, iowa, for use on its many repeaters, nodes, and bbs. It is an implementation of one of the oldest antenna designs. Principles of the dbj1 the earlier dbj1 is based on the j pole,2 shown in figure 1. J pole antenna because the j pole and zepp are electrically identical in function, and are similar to all other endfed antennas in problems, pages on jpoles, zepps, and endfed verticals overlap.
This antenna was patented in 1909 by the german, hans beggerow. The james pole antenna is constructed of 12 inch type m copper pipe, soldered together and capped on both vertical elements. Many codes store each object as a separate entity in a disk file. Unlike the popular ground plane antenna, it doesnt need ground the dbj2. Vhfuhf antenna, page 61, but i just cant get it to work. Since the antenna needed to be vertically polarized, i hit upon the notion of a j pole. J pole antenna because the j pole and zepp are electrically identical in function, and are similar to all other endfed antennas in problems, pages on j poles, zepps, and endfed verticals overlap. You will notice that 4nec2 will start a new antenna project. This link is listed in our web site directory since tuesday may 30 2000, and till today a 146 mhz j pole antenna has been followed for a total of 167. A slot antenna is a narrow rectangular opening in a large conductive surface, such as a tv satellite dish. Biconical antennas have dipole like characteristics e.
I built the dualband jpole antenna from the article in the september. The picture to the right is of a 2m amateur radio band j pole i built from an eznec simulation. Element lengthsdiameters and element spacing determine antenna behavior. This calculator can be used to design a slim jim or a j pole antenna. Media in category jpole antennas the following 7 files are in this category, out of 7 total.
Heavyduty super sturdy 58 coupling nut for added resilience. This antenna provides continuous coverage of the 2 metre 144 148mhz and 70cm 430 450mhz bands and is an excellent choice for base station use. Experiment, create you own unique designs the j is a very forgiving, yet, robust and fundamentally versatile antenna that can let you put the technical. Only one wireless antenna companys equipment shall be allowed per pole.
In 2000, i designed a modular portable hf antenna for portable use. Essentially, a j pole is a 12 wave resonant antenna connected to a quarter wave matching stub. Antennas shall be attached to truck accessible poles only. To put a loop on your antenna first tune it to the lower end of the band, lowest swr at about 144. Comes with an easytofollow user manual so you can install the antenna with ease. A discussion of antenna theory by paul graham k9erg j pole calculator and drawing by k4abt g.
All applicable pole attachment contracts shall be executed and approved before antennas will be allowed to attach. Spacer made of polystyrene to set the 420 nj elements test distance to 50 mm. I built the dualband jpole antenna from the article in the september 1994 new ham companion an easy dualband vhfuhf antenna, page 61, but i just cant get it to work. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline. Jul 12, 2015 1 adding the mast decoupling stub from the post, mast mountable j pole antenna. Wave mobile vhf flex antenna standard vhf j pole dbj1 j pole reference rubber duck received signal strength 24. Measurements and analysis suggest why quarterwave stubs fail to completely. The j pole antenna is much more popular on vhf because it ends up being a long antenna on hf, it isnt all that popular however, on the 11m band, the j pole still has a managable length 27 feet.
Electromagnetic waves and antennas rutgers university. The following files and links point to necaoyo models of various ham antennas that i have simulated andor tested over the past 30 years as an antenna designer. The design is based on an article which originally appeared in cq magazine 1987, and a version of this design is produced by arrow. The radio mast when isolated from the ground and bottom fed. In this paper, a dual band jpole antenna for vhf and uhf transceiver radio communication was simulated and implemented. Use either an electrician vinyl tape or a plastic tie, rather than a metal tie. With advancements in low cost solar powered portable l. The j pole antenna build one for the hf bands 17, 15. Reudink, performance evaluation of a cellular base station multibeam antenna, ieee trans. Copper dualband super j pole antenna by ka0nan, april 1993. Online physics calculator that calculates the long, short section, feed point, spacing dimensions values for current frequency. Basics the antenna consists of a vertical halfwave dipole that has been folded virtuthe c pole a ground independent vertical antenna kf2yn takes the vertical to new heights with this folded design that doesnt require a counterpoise.
One of the easiest portable 2m antennas to build for aresraces work is the 300 ohm twinlead j pole antenna. Yagi in the 1920s did not receive full acclaim in the united states until 1928. Download and print antenna template print out one copy each of part 1 and part 2 of the. Measurements and simulation confirm the quarterwave stub modifies the circular hplane pattern shape increasing the gain slightly on the side of the j stub element and reducing the gain slightly on the side opposite the j stub element. Slot antennas are familiar in the commercial radio world, but not to hams. No special hardware or machined parts are used in this antenna, nor are insulating materials needed, since the antenna is al ways at dc ground. J pole antenna and picked up what i needed to make the portable antenna project a reality. Jpipe is reversible from mounting foot for a variety of positioning options. Also note that there is no significant difference in performance at 2 meters between the dbj1 and a stan dard jpole. From these experiments i concludedthat at least under conditionsideal four elevated 4 radials could be. Principles of the dbj1 the earlier dbj1 is based on the jpole,2 shown in figure 1. The j pole antenna is a 12 wave antenna with a 14 wave matching stub. Being a halfwave antenna, it provides a small gain over a. Design and analysis of dualband jpole antenna with variation in t.
Kinsner, ve4wk j pole antenna for 2m 3 of 3 1 2 3 4 5 6 7 8 e d c b a e d c b a 1 2 3 4 5 6 7 8 5 june 1992 j pole parts list procedure p2 m1. Google analytics uses cookies, which are text files placed on your computer. Kb9hgi cactus dual band j pole dual band cactus j pole this is a very easy and simple 2 meter70cm vertical antenna. That means that mounting a two meter jpole at the top of a 10 foot pole will place the center of the radiating part of the antenna at about feet. A balun is necessary because a jpole antenna uses a balanced feed the. The main category is antennas for 2 meters band that is about antenna projects for 144 mhz. The jpole antenna, more properly known as the j antenna, was first invented by hans beggerow in 1909 for use in zeppelin airships. Used as a vertical vhfuhf antenna, the j pole has the advantage that it is omnidirectional, has a low angle of radiation, and does not require. From the j pole formulas we derive the lengths of each wire pair, spacing of.
I specialize in a certain type of antenna called a j pole. The nec files may be used with any of the nec2 or nec4 programs such as 4nec2, gnec or cocoanec, however some of them with tapered elements may only be simulated accurately by nec4. Its basically an endfed omnidirectional halfwave antenna, matched to the feedline by a quarter wave transmission line stub. On most of the j pole designs out there, a choke should be used as close to the feedpoint of the antenna as possible to help prevent rf on the feedline and creating difficulty with swr readings. This antenna was then tested on buchberg and i managed 4 contacts into north america on 15 metres with it using just 5 watts the amplifier had blown one of its transistors on weichberg without me realising until i saw it was not operating on buchberg. Monopole is a type of the radio antenna formed by replacing one half of a dipole antenna with a ground. Driven element is excited directly via feedline, all other elements excited parasitically. Best of all, even if the parts arent on sale, the antenna can be built.
It can be rolled into a very small coil for transportation and storage yet perform almost like a 12 wave dipole. Some hams have even gone to the trouble of lining their computer cabinets with metal foil. The antenna shall be reasonably inexpensive compared to the cost of a similar size wire dipole antenna. I use non conductive glass fibre fishing rods, beware of conductive carbon fibre. It is available in ham 144148 mhz and 440450 mhz or commercial 152157 mhz and 460470 mhz. Construction and materials used for the hpole are similar to the cpole. Customer guide for electric service for new jersey firstenergy corp. A portable vhfuhf rollup j pole antenna for public service edison fong, wb6iqn.
The j pole antenna design one for 17, 15, 12, or 10 meters the j pole antenna, also called the zepp antenna short for zeppelin, was first invented by the germans for use in their lighterthanair balloons. A jpole antenna, like the one shown in figure 1, is an end fed half wavelength antenna with a quarter wave tuning stub the j part of the antenna at one end that matches the coax feed line to the half wavelength radiating element. Since it is the second version of this antenna, i call it the dbj2. The super j pole antenna for 430 450mhz was constructed and used for fm simplex and repeater operation at my previous residence in melbourne, victoria from 2002 2007 the super j pole antenna is a colinear vertical consisting of a number of half wave length vertical elements separated with halfwave length stubs tuning stub feed with a. Super j pole antenna this antenna was developed by the independent repeater association in des moines, iowa, for use on its many repeaters, nodes, and bbs. Buildings and structures including signs, flagpoles, light standards, antennas. Construction plans for a modified version of the arrow. The entire book is freely available in pdf 2up format, and in pdf 1up format. A j pole antenna can be built out of old style tv twin lead 300 ohm parallel feed line as a roll up. Can be mounted on the roof, wall, chimney or any other flat surface. The jpole antenna is best understood as a bent dipole antenna. Measured relative performance of the dualband antenna at 146 mhz vhf.
Buck rogers sr practical antenna handbook by joseph j. Thousands of ops have built this antenna just as i describe it. Aug 07, 2015 the j pole jpole antenna variations source. A touch of class, the windom and the jpole by glynn e. Copper dualband super jpole antenna by ka0nan, april 1993. My name is michael, kb9vbr, and i carry a full line of vhf and uhf antennas for sale. The great thing about j pole antennas is their simple design and excellent performance. The sketch below shows its conceptual design from that patent. J pole antenna calculation calculate dimensions for current.
About a 146 mhz j pole antenna the resource is currently listed in in 2 categories. The radiating element of this antenna must be clear of nearby metal objects by at least inchey if side mounted on an use 6 foot side mount top of antenna may requne. A j pole is really a radiating feed line and thus can be fed on either side of the 14 wave stub the j pole has some gain over a quarter wave vertical and is omni directional. Infrared remote controller builtin 360 degree motor rotor. Navigation kb9vbr j pole antennas amateur radio, land mobile, scanner, low power fm, and airband antennas. The slim jim, designed by the late fred judd, g2bcx, can be a great portable roll up antenna, if made out of 300. Remember, without the choke, the measured vswr will be greater than 1. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Matching to the feedline is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. Is mounting the antenna as designed on a grounded steel pipe the preferred method or should the antenna be isolated from ground except through the cable.
Optical investigation of the jpole and vee antenna families osa. The w8io wb0dgf antenna site antenna modeling links. To achieve these design considerations, i concluded my 6 m dipole antenna shall be be made from rigid aluminum elements, supported at its center on a single mast, utilizing a strong, light weight plastic elementtoboom plate. The standard 2 meter jpole performance is equivalent to a flex antenna at uhf.
There are 2 radial packs and a vertical element pack. Primarily a dipole, the j pole antenna exhibits a mostly circular pattern in the h plane with an average freespace gain near 2. The most common methods are horizontal and sloped, where the feed point or center of the antenna is tied to a pole or high object in order to get the radiator as high in the air as possible. Usnerdoc kf7etx homemade 6 meter dipole antenna update project complete. Kf4eoks 2 meter super j pole antenna build super j pole for 435mhz by vk6ysf the world wide web prepared by paul howarth vk2gx. The sketch below shows its conceptual design from that patent document. The j pole antenna is a common omni directional antenna used in amateur radio, particularly on the vhf and uhf bands. These are also cheap to make and was passed on to me from another ham and i thought i would pass. The necessary parts for this project can be found in table 1, and figure 1 can be used as a basic assembly guide for building the antenna. The j pole antenna design one for 17, 15, 12, or 10 meters. A portable vhfuhf rollup jpole antenna for public service edison fong, wb6iqn. Pcaad6\shortcourse, which contains pdf files for an introductory short.
Also, see how quickly you can install a modest antenna like the radio schlock fm antenna. A polar representation of a directional antennas fronttoback ratio. The j pole will take about an hour or so out of your day to build and tune, making a great antenna for a vhf base station. Mount the antenna on a pole about 6 feet long and fasten to a step ladder or some support with some rope or electrical tape. The roach pole is very light allowing the 4 radials and the 3 light nylon guys to be secured with tent pegs 5. A closer look at vertical antennas with elevated ground. The j pole antenna is an endfed omnidirectional halfwave antenna that is matched to the feedline by a quarter wave parallel transmission line stub of lecher system form. For what its worth, the myths surrounding the j antenna have been sorted out resulting in an improved version.
Just follow the instuctions like on the diagram and swrs should be good. The j pole antenna is a popular antenna design among amateur radio operators because it is effective and easy to build. First experimental ambient backscatter communication using a. They look pretty weird, as can be seen in the following photo. The following links will download component library files for use in pls pole and tower. The zepp antenna received its name from its use on zeppelin airships. 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 morethan double your 2 meter and even 440 performance. Bending the loop effectively shortens the antenna and should bring the point of best swr up to something close to 146. Buck rogers sr 68 years as k4abt the jpole has been around since the early days of ham radio, and is a direct descendant of the windom like the windom or zepp, the jpole is a spinoff, or a modified windom for vhf and uhf. The j pole antenna build one for the hf bands 17, 15, 12. Stealth antennas for amateur radio antentop home page. You will first need to cut five 191 4 inch sections and one 23 4.
Theyre common in tv broadcasting, the skin of aircraft and in radar, microwave and cell phone applications. The j pole antenna is an adaptation of a 12 wavelength radiator end fed by a 14 wavelength transmission line that was developed as a trailing hf antenna for zeppelin airships in the 1930s. How to produce a nec antenna file and what software to. Antenna manuals, product manuals the most current manuals pdf format for the buddipole and buddistick line of antenna products. Building j pole amateur radio antennas category is a curation of 86 web resources on, concealed dss j pole, j pole antenna for your packet radio station, the j pole antenna revisited yet again.
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