Groundplane verticals they are generally endfed 14 wave radiators. What is the best book regarding antenna systems excluding. If you understand all the aspects of the antenna and can explain them without having to write a book, then i would like to know all the theory behind the. Im sorry, but every post i have read that mentioned the copper j pole or zepp antenna had no comparison with the osj antenna that showed the two to be equivalent in theory, in any way. Copper pipe j pole antenna the j pole antenna form of the zepp antenna is one of the more popular homemade vhfuhf vertical antennas. It also indicates that the j pole has been popular in mobile applications, although it is not as widely used as the quarterwave whip. We hang ours from some string thrown over a tree branch. It appears to be well constructed with most of it being aluminum and just one plastic housing part where the coax cable connects. Amazons choice customers also shopped amazons choice for. The amateur radio supplies 2m70cm dual band j pole kit is the subject. Book depository books with free delivery worldwide. Shown is empirical evidence why this is a problem and a very simple solution all future grounded j pole antennas should incorporate. The wcxd poles in the foreground support the transmission line and the control wires.
Jpole antennas ham radio, ham radio antenna, antennas. Building jpole amateur radio antennas category is a curation of 86 web resources on, jpole antenna for your packet radio station, the jpole antenna revisited yet again, j pole antenna for 6 meters. One positive point about the jpole is that its main radiating portion is high up in the middle of the top half wavelength section. I dont even feel comfortable trying to make just a monoband j pole using the twin lead. My name is michael, kb9vbr, and i carry a full line of vhf and uhf antennas for sale. It has proven to be fairly insensitive to construction methods and materials.
It gives an unbiased, informative view of what is needed for radio transmission and reception. Pdf modified fractal super jpole antenna researchgate. The j pole fed by a balanced line has essentially the same performance as the coax fed one, so it is the antenna receiving the wide range of freqs, not the feedline. Amazons choice for antenna j pole antop adjustable outdoorattic tv antenna mount pole, stainless painting inch arm length, reversible, lightweight, waterproof, easy installation 4. The yagi, j pole and nvis dipole and a glance at antenna design using 3d em software brian mileshosky n5zgt high desert amateur radio club 15 feb 20. The jpole antenna consists of a halfwavelength radiator fed by a quarterwave matching stub. The pole clamp can accept a range of pole diameters up to 2 inches. Supplier of transformer cores, clips and fets used in beverage antenna construction. The j pole antenna, more properly known as the j antenna, was first invented by hans beggerow in 1909 for use in zeppelin airships.
The vertical duraluminum poles are the 14 wave vertical antennas. The jpole antenna is a common omni directional antenna used in amateur. They confirmed that the types of people who buy the book meet the profile above. An antenna system is the antenna and everything else between the antenna and the radio. Amazons choice for j pole antop adjustable outdoor attic tv antenna mount pole, stainless painting inch arm length, reversible, lightweight, waterproof, easy installation 4. It is aimed merely by punching the proper pushbutton at the operating position inside the station. The main category is j pole antenna plans that is about building j pole amateur radio antennas. The arrl antenna book describes two common configurations of the jpole. A discussion of antenna theory by paul graham k9erg j pole calculator and drawing by k4abt g. Copper pipe jpole antennas by rory eikland, kg6hcu and ken larson, kj6rz rory and i have had excellent experience building and using j pole antennas constructed from 12 inch ridged copper pipe, so we decided that we would share our experiences. The success of the three previous editions of practical antenna handbook has been most gratifying.
Clerks in radio stores told me that this book was outselling other titles 2. About jpole theory the resource is currently listed in in 2 categories. I specialize in a certain type of antenna called a j pole. The jpole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article. The zepp antenna received a rebirth in the form of the j antenna or j pole. In order to increase the bandwidth and to provide proper phasing of the currents in the. Navigation kb9vbr j pole antennas amateur radio, land mobile, scanner, low power fm, and airband antennas. Tame the predictable mast currents found in any jpole antenna grounding conductive mast using a simple stub. An isotropic radiator is a theoretical antenna and of little practical use, except. The radio antenna handbook above is shown the unusual 75 meter beam antenna of w9pz. Buck rogers sr 68 years as k4abt the j pole has been around since the early days of ham radio, and is a direct descendant of the windom like the windom or zepp, the j pole is a spinoff, or a modified windom for vhf and uhf. It was with surprise and delight that i noted that clerks in one radio. I wa tuning a j pole this evening as i have many times before but something strange happened.
Buck rogers sr practical antenna handbook by joseph j. Probably the best book available in my view would be the arrl handbook. In this paper a super j pole antenna with two modified fractal koch curve shaped elements is proposed. Mirrored jpole the mirrorimage j pole is very easy to construct and requires only two tfittings plus a length of copper pipe.
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. Real measurements of a slim jim antenna and traditional jpole. This video takes you through the entire build process including testing. Dht electronics handheld antenna cable for wouxun baofeng quasheng linton adapter for uhf base and mobile antennas sma female to uhf so239 female connectors 6 pack of 2.
The j pole antenna is a 12 wave antenna with a 14 wave matching stub. This link is listed in our web site directory since monday oct 11 2004, and till today jpole theory has been followed for a total of 29983 times. The great thing about j pole antennas is their simple design and excellent performance. It is important to understand the feed line before discussing endfed antennas, or antennas like the j pole or zepp. Krauss antennas book is formerly known as the antenna bible. I installed the antenna on our single story roof on a 10 foot pole. The basic j is reported to have 3db of gain over a. See more ideas about ham radio antenna and ham radio. This means meters, amplifiers, antenna switches, feed lines, etc.
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. It does not need a ground plane, radials or a complicated matching system. Pdf in this paper a super jpole antenna with two modified fractal koch curve. Ed fong ed fong wb6iqn gives vaca valley radio club a presentation via skype. The traditional collinear jpole, aka super jpole antenna, improves the. Try not to place the antenna close to any metal objects as well. Jpole theory the jpole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. Use this book to discover even the most basic antenna designs wire and loop antennas, verticals, and yagisand for advanced antenna theory and. Noaa weather railroad band 160 162 mhz j pole antenna. I found that the dimensions may vary from supplier to supplier by as much as 18 of an inch. Misek antenna research publisher of the beverage antenna handbook. It is simply an airship zepp antenna standing upright. Snapon ferrite beads 11mm set of 3 kb9vbr jpole antennas.
Good to get the antenna at least 10 feet off the ground. J pole antenna handbook home page ham radio antenna, ham. Works well with handheld ht radios, base stations, and repeaters. A touch of class, the windom and the j pole by glynn e. Installerparts tv antenna j pole reversible antenna mount 1 diameter amplified outdoor hdtv antenna j pipe 20 mast satellite dish mount beige color outdoor tv antenna j mount. The arrl handbook, and antenna book have tables with various. The amateur radio operator antenna basics handbook ham radio antenna, all. To visualize the antenna, one must only picture a 3 halfwavelength vertical and a 2 quarterwavelength vertical positioned a few inches away from and centered on the the tall vertical. A copper pipe j pole antenna is a single band antenna that is much like a. 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. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. A practical approach to hf and vhf antennas, plus antenna. Our uhf slim jim antenna delivers up to 6dbi of gain on the 440 470 mhz. A good set of horizontal radials will generally out perform the cut coax to length approach.
The j pole antenna, more properly known as the j antenna 6, is one of the most popular antennas for 2m vertical use in the amateur radio ranks. One of the fractals used in antenna theory and design to. The jpole antenna consists of a halfwavelength radiator fed by a. Kf4eoks 2 meter super jpole antenna build super j pole for 435mhz by vk6ysf the world wide web prepared by paul howarth vk2gx. This book was the standard many years ago, and gives a very good treatment of antenna theory. Ideas and projects for qrp the free pdf book is a compilation of articles congenial to qrp published on 2003 2005 years at free e magazine antentop. Kb9vbr jpole antennas amateur radio, land mobile, scanner, low power fm, and airband antennas. A balun at the antenna base would prevent that radial effect of the coax shield and degrade overall antenna performance. The theory behind these two antennas is not the same, unless someone has an acceptable, technical explanation that i have not yet found. The arrl antenna book describes the j pole as a halfwave vertical radiator fed by a quarterwave stub matching section see fig. This also let me do a more direct comparison of j pole vs offcenter fed dipole, since i used the. This one is for 2m, and as i was getting the swr very good at 144. Kb9vbr, and i carry a full line of vhf and uhf antennas for sale.
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