Lazy h 2m 70cm dualband satellite antenna 5th sept. Jun 07, 2012 so, the feed point remains in the middle of element, providing a perfect match, but the cable leaves the end of antenna or the corner of moxon. The dipole centers from the 2m 6m antennas are also utilised here. Many makers of jpoles for 2 meters claim they can also be used at 70 cm. Cant compare using rubber ducks when youre purely talking about band a vs b.
Why does the 70cm band outperform the 2m band for range. The 4 dollar ham radio satellite antenna with some modifications. Kd6wds moxon antenna project antenna, projects, ham radio. Constructed of 12 and 38 hard drawn 6063t832 aluminum tubing, 6061t6 aluminum, uv resistant pvc, and stainless steel. With twice the gain of a standard jpole antenna, the 2 meter slim jim antenna is a jpole on steroids. Use this table saw miter fence technique to true up all your home brew wood boom steel rod antenna. For an overview of this antenna see the cebik article the moxon rectangle. Weaksignal enthusiasts will enjoy using these high quality beams with superior specs for ssb, cw, digital and satellite. This project to construct a vertical moxon antenna for the amateur 20m band was inspired by the work and experience of pete mills, m3kxz, and the moxon antenna project group.
Any such, capacitive, load should be placed at a high impedance point of the antenna. It was quite easy, since this one is a lot smaller. About 70cm moxon beam the resource is currently listed in in 2 categories. Sep 01, 2015 moxon mini peilantenne selber bauen antenna with directivity home made. Plus there are super specialized 2 meter or 70 cm cross. The orange type appears more firm and sturdier than the blue ones. But as the moxon gets it fabulous performance from the capacitive coupling between the ends of the two elements one should avoid upsetting this geometry. Technical description of the 2m moxon antenna using antenna modeling software program antenna was modeled using multinec software. Resources listed under moxon antenna category belongs to antennas main collection, and. Making dual band 2m70cm antenna elements from welding. You can also view a variety of different hubs and designs here. Because ground reflection involves a fresnel zone at some distance to the antenna, small screens are of limited use in overcoming the series of lobes and nulls that appear in the pattern of a highly elevated rectangle. Radio band dipole antenna ham radio simple portable speakers outdoor communication audio technology. Modeling the 40m w6nl moxon 1 april, 2012 modeling the w6nl 40m moxon greg ordy, w8wwv april, 2012 v1.
However, the beamwidth is reduced to only 56 at the halfpower points. Dimensions for 2m copper pipe moxon moxon message boards. It is popular with amateur radio enthusiasts for its simplicity of construction and great performance. Aug 18, 20 compact and effective 2m 70cm dual band antenna for satellite operation antenna was designed for so50 satellite operation. Les was looking for a compact design for the hf bands when he asked the question. This makes the 2 meter slim jim antenna a great solution for repeater sites, data and packet stations, aprs, and even every day. Collectively we have all drawn on the experience of les moxon, g6xn, and his work to transform the vk2abq 2 element. Ive never taken part in this, but thought that i might make the effort this year. Here are the original lownoise loop fed array monoband beams or optimized wideband arrays for vhf and uhf.
The moxon beam has a 0,18lambdaboom and still 50 ohm. The main category is moxon antenna plans that is about links to moxon antenna resources. A 2 element moxon antenna for the 11 meter 27mhz band. A simple 2m70cm vertical dipole antenna with images. Speedometers, thermometers, swr meters, and smith charts.
All of the aluminium used for this antenna came from a disused 6m yagi and a scrap 2m zl special. A more durable or larger moxon might use pipe instead, or pvc as a support for 12 gauge wire, as depicted on cebiks page above. This program has been derived from a public domain basic program written by l. Vortex antenna systems radio communication antenna. Compact and effective 2m 70cm dual band antenna for satellite operation antenna was designed for so50 satellite operation. The moxon pair, with lower but smoother gain across the sky dome, offers the fixedantenna user the chance to.
Satellite tracking software like hrd satellite software, orbitron, satpc32 etc are for desktop use. This beam is a 2elementyagi with radiator and reflector and reduced size to about 75% of a normal beam. What if i put here a ferrite choke right on the braid, or, possibly better, make a trap with several turns of the cable with trimming capacitor e. The antenna performs quite well on the 2 meter band, even though it was designed exclusively for the lower 3 murs channels. Very well made with high quality parts and manufacturing. I show how to use stainless steel tig welding rods can be done with other materials as well to make antenna elements for home built 2m 70cm antennae such as. Hys sma male antennas foldable cs tactical dual band 15. In this publication i explain how to build a very light weight, cheap, easy to build and deployable in 30 seconds portable vhf antenna for the 2 meter band. I tried my first contest recently rsgb 2m ukac and really enjoyed myself, although i realised just how restrictive my jpole antenna was when it comes to ssb and directionality.
If you view the various antennas in the whats new section on the homepage, youll see what we mean. A lot of performance in a modest package the boom is a mere 3. It was time to upgrade to newer modeling software so this project gave me a reason to purchase eznec from roy lewallen, w7el, and add that to the fun. I started this project after building my first mono band moxon for 15 mtr band. A satisfactory point for installing a capacitive load is. The model is for average ground conditions and with an elevation 20 feet. Moxgen will show you the dimensions and optionally generate an antenna model file for a 50 ohm moxon rectangle antenna, given the design frequency and wire size. Essentially it consists of two metal or wire elements. A 2dbi gain 2m antenna vs a 2dbi gain 70cm antenna are likely not the same thing in real life. Compact and effective 2m 70cm dual band antenna for satellite operation building the uhf cheap yagi for satellite communication station buy motorized crossed yagi antennas solution is the best solution but certainly not the cheaper. Cebik, w4rnl, developed an algorithm for calculating the dimensions of a moxon rectangle antenna.
So lets proceed to the mini moxon project at w7xa linear loading making a folded back section is somewhat mechanically complex and can add significantly to the. Most moxon antennas are built for hf frequencies and use wire and fiberglass rods as spreaders. With a boom of just 2m and fb in excess of 20db including fullband coverage, this is a supercompact field day antenna. This antenna consists of 3 moxon rectangles mounted on a boom.
The moxon antenna is a simple two element parasitic array antenna. Nov 02, 20 you inspired me with the idea of using a 70cm and 2m moxon on one boom with one coax feed. Compact and effective 2m70cm dual band antenna for. Originally designed by les moxon g6xn, the antenna is stealthy and is an ideal solution for those whose space is limited or restricted, but also gives the user a directional antenna for a smaller footprint. Moxon g6xn in his book hf antennas for all locations rsgb publications, great britain 1993. It works like it should, and i have not yet been able to test it on the 70cm band yet since i do not have a 70cm radio. The performance will embarrass an eggbeater, hands down, and probably still cost less. I experienced the same results on my 1st moxon for 15 meter band, i used an insulated wire and the resonant freq. Antenna like dual band yagi, log periodic antenna, moxon yagi antenna, ioio antenna, whip antenna can work too. The 2elementyagi with reflector has normally a 0,2lambdaboom and an impedance of 50 w. The gw3ydx super moxon adding extra directivity to the moxon rectangle for 6m, 4, and 2m photo 1. Building the moxon antenna is fairly easy and lends itself to imagination. The moxon antenna, designed by les moxon g6xn sk, is a compact two element beam antenna with about 5.
The front to back on this moxon is very good quite good in fact. Arrl handbook, antenna handbook, moxon s hf antennas for all locations for many, many years. The 6 meter moxon is built from 5 8 inch od and 1 2 inch od aluminum tubing with 3 8 inch od solid aluminum for the corners. This is antenna modeling software that uses excel for an interface and standard nec 2 equations. Ive also seen a 2m moxon with a coupled 440, ive lost the link. Links to moxon antenna resources category is a curation of 64 web resources on, possibilities of moxon yagis, gsm1800 moxon square antenna, the gw3ydx super moxon antenna. Antenna software 4nec2 graphs reported a gain of 15 dbi. You inspired me with the idea of using a 70cm and 2m moxon on one boom with one coax feed. Compact and effective 2m70cm dual band antenna for satellite operation building the uhf cheap yagi for satellite communication station buy motorized crossed yagi antennas solution is the best solution but certainly not the cheaper. Downlo building the 6 meter moxon antenna kb9vbr j pole antennas moxon beam antenna calculator new images the 20 meter vertical moxon there are numerous. A 6 meter moxon antenna discover 6 meters for the first time or enhance your existing operation with a rugged but portable version of this novel 2 element antenna. The following schematic shows the moxon s geometry and radiation pattern. This is a world wide web front end for a public domain program written by w4vp9kf using php. I need some help getting a moxon antenna for 2m to work satisfactorily.
Your choice can be a leopack antenna system distributed by amsat. Compact and effective 2m70cm dual band antenna for satellite. I wanted my 2 meter version to be free standing and rotatable so i built mine with brass tubing on a center, non conductive boom just like a beam. Moxon beam for 2m 144mhz i was reading practical wireless the other day and found a piece about the pw 2m qrp contest on sunday june 2010. The moxon antenna is a relatively simple antenna to build as it consists of just 2 elements, yet has a decent gain of about 6 dbi and a fronttoback approaching 30 dbi or more.
Jul 02, 2015 technical description of the 2m moxon antenna using antenna modeling software program antenna was modeled using multinec software. The design is rectangular, with less than half of the rectangle being the driven element and the other half being the reflector. He asked me to write this small program incorporating his work and i was happy to oblige. The performance will embarrass an eggbeater, hands down, and. Building the 6 meter moxon antenna kb9vbr jpole antennas. The driven element feed point has a impedance of 28 ohms, so a quater wave transmission line transformer with a characteristic impedance of 37.
G0ksc home of the lfa yagi free yagi antenna designs for. The antenna would make an excellent starter for a tracking azel rotator system, but it does not have the beamwidth for good fixedposition service. Although i have written about this design before, questions still pop up regularly. Magnetic mobile antenna ham radio 2 meter 70 cm 140 to 150 and 440 to 470 mhz. Eantenna vhf and uhf directional antennas ea270zb free. This is an extremely well made antenna with quality from top to bottom. It may not be intuitive at first, but the answer, at least from an antenna pattern standpoint, seems to offer some hope. Of course, that means a 2m ground plane for 2m, and a 70cm ground plane for 70cm. The program is based on an algorithm developed by l. I was tryiing to simulate the antenna with the mmanagal software but was not able to find the right dimensions. Moxon antenna calculator by brad k4nha january 6, 2015 stumbled across a good moxon antenna calculator this morning which was created by paul evans w4vp9kf. A simple 2m moxon antenna indoor antenna help by k2zs. The slim is an endfed folded dipole antenna that has a gain of 6 dbi and a nice low rf take off angle. The ideas below are for a 6 gauge wire moxon 70cm or 2m although the picture on the right shows a 12 copper pipe moxon.
Jan 18, 2016 the 4 dollar ham radio satellite antenna with some modifications. This link is listed in our web site directory since saturday sep 5 2015, and till today 70cm moxon beam has been followed for a total of 1176 times. The radiation pattern is shown in the traditional arrl style and was generated from the final design by xnecview. Jpole antenna is pretty easy to build and usually designed by amateur radio operators through this software, you can easily find out four important parameters to build this antenna namely, radiator length, driven stud length, gap space, and feedpoint. Construction of a 20m vertical moxon for use adjacent to salt. For the cost of purchasing a commercial eggbeater antenna i would strongly suggest buying a basic tv azimuth rotor and mounting basic 1 wavelength 2m and 70cm antennas fixed at 15 20 degrees elevation. The back two rectangles were reflector, driven element and 2 directors like the super moxon antenna. Cebik, w4rnl the moxon rectangle is a fascinating antenna on several scores. Jpole is a free and portable antenna design software for windows. Is it possible that you can give me some more info on that antenna.
The moxon pair, with lower but smoother gain across the sky dome, offers the fixed antenna user the chance to build a successful beginning satellite antenna. Eantenna vhf and uhf directional antennas include exciting new offerings for the 50, 144 and 430 mhz bands. Se1720m moxon antenna for 17 or 20 meter operation. The moxon antenna design the moxon antenna was designed by les moxon g6xn and is an optimisation of an earlier australian design for a compact 2el beam. Jun 11, 2014 the moxon antenna, designed by les moxon g6xn sk, is a compact two element beam antenna with about 5. Test using a quarter wave groundplane antenna on both ends to compare. The performance of the antenna, through the model, will be explored in several typical settings. This antenna consists of 2 moxon style rectangles mounted on a boom similar to a yagi antenna. Elevating the 2meter moxon and possibly a 440 mhz companion would require the use of a sizable ground screen. On a related note the standard 19 inch quarter wave mobile whip exhibits good return loss near the uhf fm segment when i measured one on my ford taurus. The back rectangle was the reflector and the driven element. The author isa keen enthusiast of the moxon rectangle antenna, invented by the late les moxon, g6xn. No two moxon s are identical save the dimensions of the elements and spacings. It describes a 4 element moxon antenna for 6m, 4m and 2m.
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