Extended double zepp antenna calculator west mountain radio. Think of the zepp antenna as a dipole that is fed from one end instead of the center. This is fig 1azimuth pattern of classic double extended zepp solid line at 7. The arrl antenna book calls it an edz, extended double zepp and says that it is normally fed with ladderline all the way to the tuner. Mmana tutotial part 4 m0mcx introducing the megaloop. About double extended zepp antenna the resource is currently listed in in 2 categories.
Some additional information and questions concerning the multiband end fed zepp antenna. Jan 16, 2003 technically, an extended double zepp is a single band antenna. The gamma match is the most used matching device used for yagi beams. Mfj 1742 doubleextended zepp wire antennas mfj1742. With this, i can work the rest of the bands from 16010, with a tuner. Unlike a centerfed dipole, an endfed antenna has a very high input impedance. Nov 08, 2009 an extended zepp is a 58wl endfed element. I just picked up two of this exact antenna from open wire guru, w7fg, earlier this week this antenna has gain over a standard 12 wave dipole. Jun 23, 2014 extended double zepp antenna duration. The measurements below are for building a extended double zepp near vertical incident skywave nvis antenna. The 40 meter extended double zepp is tne antenna to try. The 6 spaced ladder line from the antenna to the feedthru insulators is 40. The edz is an excellent, easy to build, wire antenna that produces real usable gain with.
An extended double zepp edz is a 54 wavelength centerfed dipole, i. An extended double zepp is a 2x58wl centerfed dipole. The edz is simply two 58wl monopoles configured as a dipole of about 1. Rated at 100w they are great for backpacking or emergency deployment. It can be fed with ladder line from the center insulator to tuner or it can use an impedance.
The double extended zepp is a dipole type antenna consisting of two collinear 0. They are also very useful for ares, races, mars, emcomm, nvis, first responders. Its a low cost bidrectional antenna with a little gain above a regular half wavelength dipole. Design the antenna for the lowest operating frequency to enable operation on higher. The claim by some sources that an endfed zepp has minimal radiation and good feed line balance is clearly false. Rick littlefield k1bqt article on feeding extended. The zepp name came from the use of the antenna on zeppelins in the 20s and 30s. The 80m edz is basically a 343 foot open wire fed inverted v. 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 traditional zepp had many places where the electric field, 5 feet from the feed line, was ten times or more higher than a center fed balanced double zepp antenna. Can cover hf bands, fed with 450 ohm open wire feeder terminating in an automatic antenna tuner, can perform incredible results. This link is listed in our web site directory since thursday jan 30 2003, and till today double extended zepp antenna has been followed for a total of 25545 times.
Zepp is short for zeppelin, where they were first used. Use one of the above three antenna calculators to determine the antenna length and which antenna best fits at your location. The wire ive been using, for the dipole part of my antenna is 10 gauge stranded copper thats been cut, usually, to around 88 feet 26. This article will introduce the halfextended double zepp hedz which has characteristics that a lot of. Mfj 1742 doubleextended zepp wire antennas mfj1742 free. I discuss antenna characteristics, design criteria and. Qikzepp antennas are light weight end fed monoband half wave wire antennas featuring portability and ease of deployment. Mimp motorola impedance matching program select zip file and download. I wondered if i could do it in a inverted vee since i only had one 35 foot mast available.
Double extended zepp near vertical incident skywave nvis antenna. A double extended zepp is a 3 db gain antenna formula for figuring a 58 wave per. This version of the 6 meter extended zepp antenna designed for 50 ohm coax feed is made by splitting about 15 feet of zipcord regular lamp cord wire in half to form each half of the antenna and the short feedline all at once. A double zepp is a centerfed 12 wavelength antenna. They are also very useful for ares, races, mars, emcomm, nvis, first responders and emergency preparedness. Extended double zeppelin zepp edz antenna centred at 27. It is siightly shorter than a halfwave 160 meter antenna, and it eliminates some of the tune up problems you may have encountered in the past.
Being so simple in construction, the zepp handily functions as a multiband harmonic antenna so it is useful on, for instance, the 160, 80, 40, 20, and 10 meter ham bands. Building a double extended zepp antenna iw5edi simone ham. Antenna log periodic design log periodic antenna design excel sheet file. An extended double zepp antenna is a center fed doublet, each side being 0. It is considered as an excellent, easy to build wire antenna that produces real usable gain with a broadside pattern and easy to match with 50 ohm coax. It has a bit of gain and if high enough can be a great antenna on the hf bands. Such an antenna is often called the extended double zepp. Am searching for a better 20m solution using wire antennas as i am unable to put up a beam at the location. Yet, many amateurs still do not know much about it. Formula for figuring the matching stub is b 103 divided by frequency in megahertz.
Antenna calculator and design software electroschematics. The extended double zepp revisited a vintage favorite still makes great single or multiband antenna. I was looking for more directionality on the 10 meter band, so i created an extended double zepp edz antenna the object of this antenna. Patterns are shown at 26 elevation, where the gain is maximum. Because this antenna is fed with open wire, it minimizes the losses on most bands that would otherwise be large due to swr on a coax feedline. A simple and unique slide tuning system allows fine tuning once the antenna is trimmed to resonance. An extended double zepp antenna for 15 meters is modeled mounted on two 24 foot poles spaced 60 feet apart. Double zepp the zepp is an endfed 12 wavelength antenna that once was trailed from a zeppelin airship. The diagram above shows an unspecified length of feedline to an antenna coupler. When you split it you should have 2 lengths about 15 feet long each.
The formula for figuring the matching stub is b 103 divided by the frequency in megahertz. T his 20 meter extended double zepp edz antenna should produce a 3db over the average halfwave dipole. This is called an extended double zepp antenna and produces the maximum gain possible from a simple centerfed dipole. The series matching section is just a matching method and is not part of the edz design itself which is. The double extended two 58 wave elements zepp is one of my all time favorite wire multi band antennas. Like a dipole, it might be an odd multiple of half wavelengths. Notice that the radiation resistance impedance is about 90 ohms. An extended double zepp edz antenna operates as a colinear.
This is called an extended double zepp antenna and produces the maximum gain. The k1bqt design creates an edz using a pair of 38orso rods or whips, and two justunder10 lengths of rg58 solidcore coax. 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. Here we have collected some links to building instructions for 11m antennas on the internet. The series matching section is just a matching method and is not part of the edz design itself which is just a 1. The measurements below are for building a extended double zepp near vertical incident skywave nvis. The internet is full of speculation from some seemingly reputable folks. Lets start with the calculations for making an edz. The formula for figuring a 58 wave per leg is a 600 divided by the frequency in megahertz. An extended zepp ez is an endfed 58 wavelength antenna. Extended double zepp antenna for 12 meters, an author. Chameleon antenna base hf endfed zepp antennas zepp free.
This antenna can be matched to 50 ohms by using a series inductor. About 88 zig zag double extended zepp the resource is currently listed in in a single category. This 20 meter extended double zepp edz antenna should produce a 3db over the average halfwave dipole. The antenna is cut for 15 meters and is 346 inches each side of center. Building a double extended zepp antenna iw5edi simone. This version of the 6 meter extended zepp antenna designed for 50 ohm. An extended doublezepp is a 2x58wl centerfed dipole. Jerry haigwood, w5jh he extended double zepp edz antenna has been around for a lot of years. The w8io wb0dgf antenna site antenna modeling links.
The article offers information on the extended double zepp edz antenna and its benefit for amateur radio operators. 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. Jan 08, 2015 being so simple in construction, the zepp handily functions as a multiband harmonic antenna so it is useful on, for instance, the 160, 80, 40, 20, and 10 meter ham bands. My 10 meter band extended double zepp antenna k3urt. A handheld calculator would be handy too for the math. The wire runs along the 270 to 90 axis on the graph. West mountain radio extended double zepp antenna calculator. This antenna is basically two 58 wave antennas end to end. I took measurements to certify the exact length of my feed line as it is presently installed. The extended double zepp dipole cut for 15 meters mounted 24 feet high. This link is listed in our web site directory since monday sep 27 2010, and till today 88 zig zag double extended zepp has been followed for a total of 2533 times.
My initial thought was to build an extended double zepp. Basically, the extended double zepp antenna is a pair of 58 wave elements. The antenna is cut for 15 meters and is 346 inches each side. Half of this antenna is 58 wave and is a common length for 2m mobile antennas. The extended double zepp or edz is one of the most successful wire antennas ever developed. If youve ever had an interest in zeppelins, or single wire antenna multiband operations with a tuner, then these mfj1742 double extended zepp wire antennas are for you. An automatic tuner should tune this antenna with no problem. If youve ever had an interest in zeppelins, or single wire antenna multiband operations with a tuner, then these mfj1742 doubleextended zepp wire antennas are for you.
The matching section is 450 ohm open wire feedline and is a compromise impedance between the 58 wave antenna. The double zepp is a backtoback derivative of the original endfed zeppelin antenna find mfj 1742 double extended zepp wire antennas mfj1742 and get free standard. Is it better than just feeding it with about 15 inches of ladderline. Technically, an extended double zepp is a single band antenna.
A vintage favorite still makes a great single or multiband antenna. The total length of the feeders from the feedthrough insulators, through my antenna. I just picked up two of this exact antenna from open wire guru, w7fg, earlier this week this antenna has gain over a standard 12 wave dipole almost 1. Listed under the antennas160m category that is about antenna for 160 meters band. The 40m extended double zepp by jim streible, k4dli there were many new and somewhat unfamiliar antennas used at this years nfarl field day. Software version author, type of yagi design, inputopenimport file. Double extended zepp antenna iw5edi simone hamradio. If you make your feedline 12wl long including velocity factor your antenna will at least tune 40m with no problem and no tuner required. Jun 24, 2014 15m extended double zepp antenna build. The halfextended double zepp hedz antenna a dualbander. The main category is indoor antenna that is about amateur radio indoor antenna projects.
A double extended zepp is a 3 db gain antenna formula for figuring a 58 wave per leg is a 600 divided by frequency in megahertz. Endfed zepp for receiving, november december 1941 radio. The extended double zepp edz a double extended zepp is a 3 db gain antenna. This article will help you make your own system, including a. In other chapters i told that gain, bandwith, fb etc. A double zepp dz is a onewavelength centerfed dipole, i. But first, i have experimented with the infamous g5rv an antenna that was actually designed to provide gain on, yes, 20 meters. If it is used on other bands, it is no longer an edz. The only wire dipole with gain is the extended double zepp edz. John reh, k7kgp click here to report a problem with this file. The main category is antenna for 160 meters band that is about 160 meters band antenna. Chameleon antenna base hf endfed zepp antennas zepp. The double zepp is a backtoback derivative of the original endfed zeppelin antenna find mfj 1742 doubleextended zepp wire antennas mfj1742 and. Lets see some antenna calculator and antenna design software that will help you design.
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