Groundplane verticals they are generally endfed 14 wave radiators. It appears to be well constructed with most of it being aluminum and just one plastic housing part where the coax cable connects. One of the fractals used in antenna theory and design to. About jpole theory the resource is currently listed in in 2 categories. 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. The radio antenna handbook above is shown the unusual 75 meter beam antenna of w9pz. The traditional collinear jpole, aka super jpole antenna, improves the. The success of the three previous editions of practical antenna handbook has been most gratifying. This means meters, amplifiers, antenna switches, feed lines, etc. J pole antenna handbook home page ham radio antenna, ham. The arrl antenna book describes two common configurations of the jpole.
Jpole antennas ham radio, ham radio antenna, antennas. Tame the predictable mast currents found in any jpole antenna grounding conductive mast using a simple stub. The main category is j pole antenna plans that is about building j pole amateur radio antennas. Real measurements of a slim jim antenna and traditional jpole. What is the best book regarding antenna systems excluding. Krauss antennas book is formerly known as the antenna bible. 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 wcxd poles in the foreground support the transmission line and the control wires. Noaa weather railroad band 160 162 mhz j pole antenna. 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. A practical approach to hf and vhf antennas, plus antenna. The jpole antenna consists of a halfwavelength radiator fed by a.
Use this book to discover even the most basic antenna designs wire and loop antennas, verticals, and yagisand for advanced antenna theory and. It gives an unbiased, informative view of what is needed for radio transmission and reception. The basic j is reported to have 3db of gain over a. 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. In this paper a super j pole antenna with two modified fractal koch curve shaped elements is proposed. This book was the standard many years ago, and gives a very good treatment of antenna theory. A good set of horizontal radials will generally out perform the cut coax to length approach. Misek antenna research publisher of the beverage antenna handbook. 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. Kb9vbr, and i carry a full line of vhf and uhf antennas for sale. See more ideas about ham radio antenna and ham radio. Kf4eoks 2 meter super jpole antenna build super j pole for 435mhz by vk6ysf the world wide web prepared by paul howarth vk2gx. Probably the best book available in my view would be the arrl handbook.
Clerks in radio stores told me that this book was outselling other titles 2. Amazons choice customers also shopped amazons choice for. Jpole theory the jpole antenna is an omnidirectional antenna that can be used for base, mobile and field day stations. 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. I found that the dimensions may vary from supplier to supplier by as much as 18 of an inch. The arrl antenna book describes the j pole as a halfwave vertical radiator fed by a quarterwave stub matching section see fig. Snapon ferrite beads 11mm set of 3 kb9vbr jpole antennas.
For 2 meters, the coil is 4 turns of coax at 5 inches in diameter. The vertical duraluminum poles are the 14 wave vertical antennas. Book depository books with free delivery worldwide. It does not need a ground plane, radials or a complicated matching system. I specialize in a certain type of antenna called a j pole. 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.
An isotropic radiator is a theoretical antenna and of little practical use, except. The j pole antenna, more properly known as the j antenna, was first invented by hans beggerow in 1909 for use in zeppelin airships. Our uhf slim jim antenna delivers up to 6dbi of gain on the 440 470 mhz. Navigation kb9vbr j pole antennas amateur radio, land mobile, scanner, low power fm, and airband antennas. 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. The antenna has an omnidirectional pattern with a low takeoff angle. The arrl handbook, and antenna book have tables with various. It was with surprise and delight that i noted that clerks in one radio. The amateur radio supplies 2m70cm dual band j pole kit is the subject. Trailed behind the airship, it consisted of a single element, one half wavelength long radiator with a quarter wave parallel feedline tuning stub. A discussion of antenna theory by paul graham k9erg j pole calculator and drawing by k4abt g. Mirrored jpole the mirrorimage j pole is very easy to construct and requires only two tfittings plus a length of copper pipe. We hang ours from some string thrown over a tree branch.
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. Buck rogers sr practical antenna handbook by joseph j. I wa tuning a j pole this evening as i have many times before but something strange happened. Pdf in this paper a super jpole antenna with two modified fractal koch curve. 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.
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. The j pole antenna is a 12 wave antenna with a 14 wave matching stub. This one is for 2m, and as i was getting the swr very good at 144. The amateur radio operator antenna basics handbook ham radio antenna, all.
A copper pipe j pole antenna is a single band antenna that is much like a. Good to get the antenna at least 10 feet off the ground. This also let me do a more direct comparison of j pole vs offcenter fed dipole, since i used the. Kb9vbr jpole antennas amateur radio, land mobile, scanner, low power fm, and airband antennas. 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 installed the antenna on our single story roof on a 10 foot pole. The great thing about j pole antennas is their simple design and excellent performance. The jpole can be cheaply, simply and quickly constructed using a variety of techniques, some of which are discussed in this article. 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. It is simply an airship zepp antenna standing upright.
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. The jpole antenna consists of a halfwavelength radiator fed by a quarterwave matching stub. 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. Amazons choice for antenna j pole antop adjustable outdoorattic tv antenna mount pole, stainless painting inch arm length, reversible, lightweight, waterproof, easy installation 4. This video takes you through the entire build process including testing. It is aimed merely by punching the proper pushbutton at the operating position inside the station.
An antenna system is the antenna and everything else between the antenna and the radio. It has proven to be fairly insensitive to construction methods and materials. My name is michael, kb9vbr, and i carry a full line of vhf and uhf antennas for sale. It is important to understand the feed line before discussing endfed antennas, or antennas like the j pole or zepp. 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. It also indicates that the j pole has been popular in mobile applications, although it is not as widely used as the quarterwave whip. A balun at the antenna base would prevent that radial effect of the coax shield and degrade overall antenna performance. Try not to place the antenna close to any metal objects as well. The theory behind these two antennas is not the same, unless someone has an acceptable, technical explanation that i have not yet found. The zepp antenna received a rebirth in the form of the j antenna or j pole. Copper pipe j pole antenna the j pole antenna form of the zepp antenna is one of the more popular homemade vhfuhf vertical antennas. Ed fong ed fong wb6iqn gives vaca valley radio club a presentation via skype.
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