Dual band j pole pdf merge

Kb9vbr jpole antennas are highly effective, affordable antennas for the vhf and uhf frequency spectrum. I ordered a dual band antenna from arrow antenna and. A new design method for a dualband or dualfrequency modified wilkinson power divider with an unequal power dividing ratio is proposed in this article. For a portable station, you can mount a vertically oriented wire antenna such as the dbj2 rollup jpole on a 2030 foot push up fiberglass travel mast. I have had this antenna on my roof since 1992 and it has been problemfree in the san francisco fog. The dual band unit uses a wooden dowel in the middle of it and since i live in a high wind area, it broke about 3 weeks after i put it up. The collinear jpole, often known as the superj, does improve the behavior over a regular jpole. 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. Copper dualband super jpole antenna by ka0nan, april 1993. I specialize in a certain type of antenna called a jpole. 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. About 3 band jpole antenna the resource is currently listed in in a single category.

Figure 1the dualband moxon antenna layout, with basic element dimensions. Your going to like this super jpole project, this home made jpole is easy to build and sturdy, while looking for an jpole antenna project to build i remembered seeing a marine antenna called the super jpole in the 1988 arrl antenna handbook, which claimed a 6 db gain over a quarter wave ground plane. Dualband modified wilkinson power divider without transmission line stubs and reactive components by y. As many attest, there is an advantage when vertically combining 12 radiating sections to have a bit of separation between the halfwave end points. This is my revised base 2m70cm copperpipe j, a howto diy with an optional method to make a portable dualband j for hotel travelers, restricted apartment dwellers, or for limited balconypatio use.

This page documents a build of a 2element 12 wave collinear jpole performed by harry, kc9eot, and myself, kb8ojh. Other very good j antenna designs published in 73 magazine have been. Most of the energy at the third harmonic is launched at 44 figure 3 the original dbj1 dualband jpole. The power divider is composed of two section coupledlines, one. In this paper, a novel modified wilkinson power divider without transmission line stubs such as shortcircuit stubs and opencircuit stubs and reactive components such as. Dualband combiner 698 806 mhz 824 960 mhz designed for cositing purposes enables feeder sharing integrated autosense technology for automatic dc aisg detection and bypass functionality. I have purchased a dbj1 jpole dual band antenna and am planning on mounting it above my roof line. The antenna is enclosed in uvresistant pvc pipe and can thus withstand the elements with only the antenna connector exposed. Romex dualband jpole antenna dara thursday night group. The method presented here is the first and simplest of the. In addition, a link to the qst article is included near the bottom of this page.

My name is michael, kb9vbr, and i carry a full line of vhf and uhf antennas for sale. About 144430 dualband jpole antenna the resource is currently listed in in 2 categories. The james pole antenna is constructed of 12 inch type m copper pipe, soldered together and capped on both vertical elements. There are many rumours on the internet, claiming that the slim jim has better performance than the j pole. They look pretty weird, as can be seen in the following photo.

Millso headset splitter for 2 trrs headphones or mics 3. A generalized twoway coupledline power divider with extended ports for dual band is proposed in this paper. Jpole antenna because the jpole 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. The jpole antenna is a common omni directional antenna used in amateur radio, particularly on the vhf and uhf bands. A balun is necessary because a j pole antenna uses a balanced feed the. A balun is necessary because a jpole antenna uses a balanced feed the. I stumbled into the product online and read some of the companys feedback on that big online auction site, then decided to go ahead and order one of these antennas. Great product, read description carefully by joe from wi. I can hit local repeaters with my ht but i want something a little more permanent. A tri band antenna for 2 meters, 220 mhz, and 70cm antenna. The dimensions given assume that the antenna is inserted into a 3. The main category is j pole antenna plans that is about building jpole amateur radio antennas.

The dual band jpole antenna 6mtr and 2mtr bands constructed and used at my previous residence in melbourne, victoria from 2001 2007 due to space limitations and the need to keep the visual pollution of too many antennae to a minimum i required antennae that are able to cover multiple bands. Looking for a simple, affordable, high performance antenna. Construction plans for a modified version of the arrow. I built the dual band j pole 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. The calculator above will give you a good starting point, although spacing between the elements, velocity factor and other differences will have an effect on where this actually is. The main category is antennas for vhf uhf bands that is about antennas for vhf and uhf radio bands. Long before martyka0nan wrote the article on his super jpole, he had been constructing and selling them at all the local hamfests here in the twin cities. An easy dualband vhfuhf vertical antenna made with a tv twin lead and coax cable. The jpole antenna is a 12 wave antenna with a 14 wave matching stub. The great thing about jpole antennas is their simple design and excellent performance. Build a second jpole, which will look like an lpole, the vertical is 3834 inches from the top of the antenna, down to the centerline of the horizontal member. The portable or base 2m70cm copper pipe j antenna by. For a base station, this can be achieved using a permanent mast and an outdoor antenna. Singleband and dualband artificial magnetic conductor ground planes for multiband dipole antenna minimize the amc size and to be suitable for uhf rfid applications.

The design is based on an article which originally appeared in cq magazine 1987, and a version of this design is produced by arrow. Both antennas have served many hams around the globe well. Figure 5 dual band j pole with a 220 mhz copper pipe j pole attached at the bottom. A generalized coupledline dualband wilkinson power divider with extended ports by j. With the lead in coax, total length approaches 8ft. For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Understanding antennas for the nontechnical ham by n4ja. The jpole is a slim, omnidirectional, halfwave antenna fed at the end through a quarterwave shorted transmission line. Hand crafted in the usa since 2001 and thousands of satisfied customers nationwide. This link is listed in our web site directory since thursday jul 7 2016, and till today 3 band jpole antenna has been followed for a total of 2056 times. Fongs simple vertical wire j pole antenna elevated to 20 feet on a push up tripod mast. 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.

If you like building good antennas, this one is for you. You should enjoy many years of happy dualbanding with the copper you may write john post ke7ax at. A dualband, lowprofile, circularly polarized antenna on an artificial magnetic conductor amc is introduced in this letter. I was looking for something that was vertical, omnidirectional and with good gain that i could make quickly and easily. Kinsner, ve4wk jpole 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 jpole parts list procedure p2 m1. The stacked jpole first build a regular monoband jpole from the copper cactus plans for a 2meter antenna, leaving off the top pipe cap.

I was trying to increase the overall performance of the jpole, in this design. 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. Its predecessor is the famous zepp antenna developed for the zeppelin airship. This project was discussed at the september 19, 20 dara thursday night group meeting. Jpole antenna plans these files are now located on our web server dual band jpole. This link is listed in our web site directory since saturday feb 17 2007, and till today 144430 dualband jpole antenna has been followed for a total of 15008 times.

In combine mode, the autosense combiner has the ability to operate in three different functions. A 2 meter 146 mhz jpole antenna that is inexpensive, and easy to build. The antenna employs a single feed and two crossed asymmetric dipoles. If you want to build a 12 and 17meter dual band quad, the spacing will be 8 feet, the same as it should be for 15 meters.

Dbjuhf was developed from a grant from ac daughty to develop a low cost medium gain mesh antenna for uhf. A closed form design approach for multiband blcs operating at arbitrary frequencies is presented and validated by the successful design of dualband, tripleband, and quadband blcs. Finally, the multiband branchline coupler blc is a key component for also extending the design of dpas to multiband in the future. Not practical for implementation although triband operation is achieved. This vertical polarized antenan covers the frequency range from 216229mhz which makes the antenna suitable for all sorts of applications such as 2way radio and vhf tv. The copper cactus twoband jpole was from a 73 article by john post ke7ax and was. Enter the bsquare engineering dualband jpole into this equation. Dualband lowprofile crossed asymmetric dipole antenna on. The picture to the right is of a 2m amateur radio band jpole i built from an eznec simulation.

For a singleband 20meter quad, space the elements 12 feet apart. 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. Antenna help dbj1 dual band jpole hello i am new to ham radio and am setting up a shack. The swr curves are fairly flat, usually less than 1. I have since removed the top section and made it a single band. Great product, read description carefully these are for.