But if i could keep only one book, i would definitely choose balanis because, in my nonexpert opinion, it is more coherent, more systematic, and has a stronger emphasis on principles. Heres an alternative explanation of how the popular zepp or zeppelin antenna works. Mfj endfed zepp antennas mfj6120 free shipping on most. It features a succinct treatment of the finite difference, time domain fdtd computational technique. Kraus this text is for the course on antennas offered to the seniorgraduate level by most electrical engineering departments. About 4080 halfextended double zepp antenna the resource is currently listed in in 2 categories. Understanding antennas for the nontechnical ham by n4ja. It is in a condensed form and the antenna theory is explained so most hams can understand it. New coverage of microstrip antennas provides information essential to a wide variety of practical designs of rectangular and circular patches, including computer programs.
They are also very useful for ares, races, mars, emcomm, nvis, first responders and emergency preparedness. This length 7,050 and k or is also correct for f f 3440 and k 1. One of the easiest, and cheapest is the extended doublezepp, or edz. In dealing with both antenna theory and radio wave propagation, a theoretical. Being a halfwave antenna, it provides a small gain over a. 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. Chapter 1 one of the bestknown cardinal doctrines of antenna theory is the concept of reciprocity. This antenna is often called a centerfed zepp, although any similarity to a true zepp antenna is purely visual. End fed antenna operating manual cross country wireless. I have two standard textbooks on antennas, namely, antenna theory by balanis and antennas by kraus both third edition. Arrl antenna book 24th edition is the leading resource in antenna theory. Zepp antenna article about zepp antenna by the free. Antenna wire the antenna wire is black insulated wire and has a 25 foot matching section and 50 foot radiator section. The text explains both the basic theory of antennas and its application to practical designs.
The extended double zepp edz a double extended zepp is a 3 db gain antenna. The zepp name came from the use of the antenna on zeppelins in the 20s and 30s. This double extended version provides 3 db gain over a dipole on the band it is designed for and each side or leg is about 58 wavelength long. Chameleon antenna endfed zepp antennas have been specially designed for apartment or attic antenna installation, and for operators who are trying to operate from condominiums under homeowners associations hoas, deed restrictions and covenants, conditions and restrictions ccrs. The frequency range of the amateur bands may be tolerated by this length even though the transmission line be terminated in an antenna impedance not a pure resistance. Antenna tuner, matching network, matchbox, transmatch, antenna tuning unit atu, antenna coupler, and feedline coupler are all equivalent names for a device connected between a radio transmitter and its antenna, to improve power transfer between them by matching the specified load impedance of the radio to the combined input impedance of the feedline and the antenna. Jerry haigwood, w5jh he extended double zepp edz antenna has been around for a lot of years. For a simple singlewire antenna, the gain advantage versus length reaches the point of diminishing returns on the order of a half wavelength or so. The centerfed zepp can be remarkably efficient, despite the relatively high swr along its feed line. Btw counterpoise is also described in my ancient antenna book as a generic term for elevated radials. Double zepp the zepp is an endfed 12 wavelength antenna that once was trailed from a zeppelin airship. This unrealistic theoretical antenna is a common reference. The gain, directivity, radiation pattern, and electrical impedance of an antenna are the same, whether its used as a transmitting antenna or receiving antenna.
A zepp antenna for coverage of the amateur bands is a different proposition. Endfed zepp for receiving, november december 1941 radio. It seems then that the impedance at the tuner would be closer to 50 ohms and easier to deal with. The discipline of antenna theory has experienced vast technological changes. But, i am not a theory book writer, only someone who likes to make sense of things as best i can. In the centerfed zepp, concerns about antenna feedpoint. To me, it seems like a full wavelength dipole a zepp might prefer a 14 wave matching section, just as an end fed zepp is recommended to have. It theory 2016 arrl antenna book should be pretty much same when it comes to zepp description. End fed antenna counterpoise or matching transformer. Therefore, to achieve that goal, you should read this book from cover to cover. Endfeeding a halfwavelength antenna has certain physical advantages over centerfeeding the same length of wire. The matter presented is essentially practical rather than theoretical. Typically a dipole can be used down to 12 of its resonant frequency.
This book is about common medium wave and high frequency short wave antennas, but the theory presented here relates to antennas of any frequency. The extended double zepp revisited a vintage favorite still makes great single or multiband antenna. The antenna is constructed much like an ordinary dipole antenna but with 58 wavelength elements matched with an added impedance matching section of balanced feed line. Building a double extended zepp antenna iw5edi simone. The lengths in the left column are the sum of the feedline. In a discipline that has experienced vast technological changes, this text offers the most recent look at all the necessary topics. Zepp antenna theory heres an alternative explanation. The jpole 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. It will also appeal to practicing engineers working on antenna development. Chameleon antenna base hf endfed zepp antennas zepp.
We are pleased to offer the 21st edition of the arrl antenna book. Theres been a lot of recent interest on qrpl in the w3edp antenna. An extended double zepp is a long dipole with 3dbd gain. These are preliminary notes, intended only for distribution among the participants. This antenna also requires the use of a matching network transmatch at the transmitter end of the feed line. This book introduces the fundamental principles of antenna theory and explains how to apply them to the analysis, design, and measurements of antennas. Due to the variety of methods of analysis and design, and the different antenna structures available, the applications covered in this book are made to some of the most basic and practical. The edz is an excellent, easy to build, wire antenna that produces real usable gain with. It was written primarily for the newcomer and the nontechnical oldtimer. The jpole antenna, more properly known as the j antenna, was first invented by hans beggerow in 1909 for use in zeppelin.
One of the earliest examples was the zepp antenna where the half wave antenna was end fed by an open transmission line. Developed specifically for engineers and designers who work with radio communications, radar and rf engineering, this book offers practical and handson treatment of antenna theory and techniques, and. Qikzepp antennas are light weight end fed monoband half wave wire antennas featuring portability and ease of deployment. As i mentioned you could use ropes to support the extra feed length. The 58 wave vertical or the extended double zepp, at twice this length, generally represent the maximum gain scenario for singleelement antennas.
Think of the carolina windom antenna the modern version of the windom as an upside down vertical antenna, hanging down from its counterpoise strung more or less horizontally some 10 meters or more above ground in other words, the 22 feet vertical component of the carolina between the 4. Remember the longer the antenna is the lower in the band it will operate, you can tune a long antenna with an antenna runer but you cannot tune a short antenna. Matching transformer the matching transformer provides impedance matching for the cha zepp antenna. Ver2calwireantenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya. Horizontal antenna which is a multiple of a halfwavelength long and is fed at one end by one lead of a twowire transmission line that is some multiple of. The double extended zepp is a dipole type antenna consisting of two collinear 0. Realizing many hams are mathematically challenged, only simple mathematics procedures are used. The latest resource for the study of antenna theory.
Yet, many amateurs still do not know much about it. It is also the first text to treat physical theory of diffraction ptd. Best suggestion is to make the antenna for the lowest operating frequency so that you can operate the entire band you desire. The bands lie in quite good harmonic relation, and so one endfed zepp approximately 69 feet long flattop only will operate efficiently on the 40, 20 and 10 meter ham bands. It can be erected in limitedspace situations where, for one reason or another, the length of feedline needed to reach a. The third reason is a desire to teach basic antenna theory to the average ham. A simple and unique slide tuning system allows fine tuning once the antenna is trimmed to resonance. The main category is antennas for 40 meters band that is about 40 meter band antennas projects.
Rated at 100w they are great for backpacking or emergency deployment. In response, constantine balanis has updated his classic text, antenna theory, offering the most recent look at all the necessary topics. Use the 17 foot length and one 84 foot length to whip up a w3edpendfed zepp, or use the two 84 foot lengths for an ffd. This edition includes recent antenna innovations and applications. Balanis the discipline of antenna theory has experienced vast technological changes. That is, it is a piece of wire onehalf wavelength long with the feedline connected at one end. Understanding antennas for the nontechnical ham by n4ja an.
West mountain radio extended double zepp antenna calculator. Antenna theory analysis and design 2nd ed internet archive. A zepp is a tuned systemhalf wave antenna fed with a 14 wave feed. The endfed zepp is a duplication of the endfed trailingwire antennas made famous by the giant airships. The matching section is 450 ohm open wire feedline and is a compromise impedance between the 58 wave antenna elements and the feed point, a 4. It was originally used on zeppelin airships in world war 1 as a trailing wire lowered from the airship while in flight. Highly respected authors have reunited to update the well known 1981 edition which is still hailed as one of the best in its field. What is the best book regarding antenna systems excluding. The end fed half wave antenna is a classic hf antenna. Ictpituursi school on wireless networking for development the abdus salam international centre for theoretical physics.
Others have made up peg boards from wood with wooden dowelspeg to provde a lengthy s pattern in a short area to support extra feed lengths of owl. New material includes smart antennas and fractal antennas, along with the latest applications in wireless communications. New material includes smart antennas and fractal antennas, along with the latest applications in wireless. This is an antenna with a 84 foot wire on one side of the output port and a 17 foot wire on the other side. There is an explosion of available books and articles on the subject of antennae and antenna systems. Zepp is short for zeppelinand that is where they were first used.
Double extended zepp antenna iw5edi simone hamradio. If youve ever been intrigued by zeppelins, then these mfj endfed zepp antennas are for you. Parts of the antenna the cha zepp is comprised of the following components, see plate 1. The design was based on the endfed zep antenna as once trailed from zeppelin airships. Analysis and design, 3ed by balanis and a great selection of related books, art and collectibles available now at. The very common dipole antenna is a halfwave wire that is broken at the center for connection to the feedline. Use of a dipole on several bands it is possible to use a center fed dipole over a wide range of frequencies by. This link is listed in our web site directory since monday apr 2 2007, and till today 4080 halfextended double zepp antenna has been followed for a total of 11079 times. Many of the antenna books show this antenna fed via a 0. It has a bit of gain and if high enough can be a great antenna on the hf bands. An antenna system is the antenna and everything else between the antenna and the radio. My 1974 edition is pretty descriptive about zepp and there is no counterpoise word nowhere in the article. This website is intended to be a source of knowledge for learning about and understanding antennas. The secret is the ladder lines low loss, but the antenna tuner is another story.