Coax moxon. Jan 22, 2024 · 70 cm moxon made from 6 gauge wire.

• Coax moxon Design a lightweight Moxon antenna for the upper HF bands and VHF. Material needed: 3 or 3. net David, I don't see any connection to the shield of the coax used in the driven element or the reflector (see drawing, "Center Conductor only is attached to feedline on both ends!"). " The pole brackets were cut from the prefabricated Al profile 30x30 and 30x20 mm. 2/6. Jun 10, 2022 · The five-element Moxon Yagi features a short boom (5. At 28. You can find the associated write up here: https://www. Jun 7, 2012 · A SWR of less than 1. You can also see in the bottom right of the picture a coax choke balun. Designing MOXON Rectangles by Equation and by Model Moxon antenna designer. VA3ZW "Scott", VA3ZW@arrl. This loss is however small in most cases with SWR:s up to 2 or 3 and not overly long runs of coax. Dec 15, 2010 · 20/15/10 meter 6 element beam Moxon/Yagi (14-21-28 MHz). It’s ready to go! A Moxon on 10 meters. The Moxon antenna (invented by Les Moxon (SK 2004), G6XN) is sort of a two element yagi with the elements folded and spaced to eliminate the need for an impedance match. 3. Cable ties for coax fixing. He decided to try a MOXON for 20 meters which he says was fast and easy to build. The result is an antenna of small dimensions and gain equal to a 2 element Yagi of 1/2 wavelengths. Vlatko reports that a few months ago, he made a Hex beam for 20 meters, but was not quite pleased with it. The 2-element Moxon design for the 2m band was created using the free program "Moxgen" [1] by Dan Maguire, AC6LA, and subsequent processing with EZNEC+ V. The interesting properties of the Moxon beam were mentioned in detail in [2]. The Moxon does very well at low heights and I do believe I could get better performance at a higher height. Vertical Moxon with different feeding. This latter type of common mode choke is often referred to in the vernacular as an “ugly balun. Co-Phasing Co-phasing or “stacking” has long been a way to get high gain from antennas. ) and a low weight of only 6. May 1, 2014 · SWR was flat and impedance was on the nose at 50 ohms. The document provides instructions for building a 2M Moxon antenna using PVC piping. The X In the middle is strictly for holding the coax and balancing it from the middle of the antenna. 00/10 Last updated: 2025-01-05 Mar 31, 2024 · Build a 17 Meter Reduced Size Coaxial Moxon Retangle A standard Moxon rectangle designed for 17 meters would be about 19 3/4 feet wide, the same Moxon retangle is reduced to about 11 feet wide: Dual-band-wire-beam-12-and-17mt the dual band wire Beam Moxon with Fiberglass tubing spreaders, Flexweave elements 12/17 m Moxon with one 50 ohm feed 20m 2 el. Notes on the MOXON Rectangle Pattern . ” CONSTRUCTION: The driven element is soldered direct to a piece of UT 141 ( I think) 50 ohm solid coax with an N type plug. It has a gain of almost 4 dBd and an excellent f/b of 35 dB. The coax feed line runs inside the mast to the antenna. Oct 15, 2020 · Antenna Moxon Links → . Apr 30, 2018 · This time we're constructing a Portable Vertical Moxon Antenna for 20 Meters using simple hardware and some telescopic poles. Weighs ten pounds. I am contemplating building a moxon like W3CCR's moxon (20 mtr), and also a 17 mtr moxon in the same fashion. The Moxon Antenna . I found a plastic garden stake that fitted perfectly in the 3/8" tubing to act as the spacer between the element and reflector. Note: A Moxon antenna is intended for long range and has a more narrow field of operation. I thought I was in for a bit of trimming. Thank you Dan, Interesting article and it says it all. He calculates that each elements feed point impedance to be about 80 -100 ohm's impedance. No traps or relays, one single coaxial cable. An Aluminum 2-Element Moxon Rectangle 10m L. k5acl. The resource has been on our site since Saturday Jan 6 2024, and it has been viewed 107 times. 5' needed. 7 and 50-52 MHz, requires only one coax feed line, and the included 3kW balun has an SO-239 connector. N0KHQ's Coaxial MOXON. beam Moxon (14 MHz) DXBeam (DXM20-2mx) Contact Phone: +33 977759654 (14-19h) Email: • To avoid having stray current on the braid of a coaxial cable Features High gain, high efficiency directional transmitter antenna Compact and rugged housing Using professional RF PCB substrate, optimised for traditional MOXON design Uses heavy-duty RG402 coax cable and customised 360° swivel RP-SMA socket Featuring an 80mm coax cable, reduces interference to the transmitter Speci I would recommend the Moxon to anyone to have a play!! Good Luck & Good DX. The antenna shows an SWR of better than 1. 5 MHz. 5 Unfortunately, this was not practical for me, as I use this antenna for portable use and prefer to separate the coax from the antenna. Nov 11, 2020 · Well snag my blade! All was good now. ); gains of 8. Steve's design included using pvc pipe for his 2 element, 6 meter beam, and his 3 element, two meter beam. Maybe some of the big guns like henry HPSD, marconi or Homer etc may be able to give you some proper info on how the coax would affect the pattern with the moxon in a vertical polarization. This way, it takes fewer supports to put up a wire moxon. If you run 100W and have already built a 20m Moxon, it's a simple and cheap way to get on 17m as well. Oct 4, 2023 · Dual Band Moxon Yagi elements mounted on the boom and driven element connected to SO 239 connector. Jun 11, 2014 · The Moxon Antenna, designed by Les Moxon G6XN (SK), is a compact two element beam antenna with about 5. com; towertalk@contesting. Invented by Les Moxon, G6XN, the MOXON is a stealthy gain antenna that's inexpensive and fun to build. com > > David, > > I don't see any connection to the shield of the coax used in the > driven element or the reflector (see drawing, "Center Conductor only > is The 2850MOX Dual Band Antenna covers 28-29. 3 dBi on 10M, 10. 70cm yagi antennas KD6WD's MOXON. 5 MHz it is 2. 44 > Build a 17 Meter Reduced Size Coaxial Moxon Rectangle A standard Moxon rectangle designed for 17 meters would be about 19 3/4 feet wide: Building Moxon antenna 10-15-20 mt Building a moxon is easy since you can work on it on a horizontal plane: Dualband 17m/20m Moxon The voltages across the capacitors on 17m are high. Steve, k4mmg asked me to share my design of two coaxial Yagi antennas I made for use on 6 and 2 meters. Figure 1 — A comparison of the lower radia-tion angle and greater gain of the Moxon (red) compared to the dipole (blue). hamuniverse. With a tuner at the transmitter the only negative with higher SWR is increased loss in the coax. The coaxial cable is attached directly to the radiator with M4 screws, a balun is not required. All measurements are in millimeters and the position of the driven element is at 271 mm. MFJ-1890 for ten meters spans a mere 12 on a lightweight 50 boom. In this update I answer some questions and put some excellent advice to use. By taking the features of Moxon and adding some new ones, the coaxial cable of Moxon V2 is soldered to the antenna, decreasing the signal transmission loss for better performance. In truth, I find that the difference in front-to-back is maybe not as much as touted. 9 feet); lightweight design (13. > > The *inside* of the coax shield and the center conductor form a coaxial stub > that's in series with the outside. 3 dBi forward gain. A sweep of the 17 and 15-meter bands while feeding the 17M Moxon showed an SWR under 2:1 for each band. Larry Banks, W1DYJ 1Notes appear on page 40. B. I tried The Bandit Moxon features a heavy-duty RG402 coax to optimize signal transmission and reduce external interference. Then I’ll add a longer coaxial to reach the transceiver. It details the specific PVC parts needed and how to assemble the frame. I have had numerous requests over the last few years for the dimensions and construction plans for Moxon rectangles designed for the 6-meter band. An Aluminum MOXON Rectangle for 10-Meters . Mount anywhere using lightweight TV antenna ha Oct 18, 2011 · Perhaps running the coax along the boom and down the back reflector would be an option but you may find you don't even have to do this. Moxon Rectangle (Yagi) for 18MHz - 17m. html A quarter wave coax, shorted at the end shows an infinite impedance. 2. At 17 meters, the N0KHQ array has a perimeter length of 42', while the full-size Moxon measures about 54'. It comprises of 2 elements, a driven element and a reflector element. There are a lot of options between amazon, aliexpress etc, and I’m wondering if anyone has a recommendation for replacement antennas for the 915mhz band. It has a short boom of 180cm (5. The antenna's driven element and reflector are #12 bare copper wire held 3" above the PVC pipe on ¼" fiberglass standoffs made from a driveway As you can see I have used a coax RF balun. Is a Moxon antenna convenient way to connect the coax and transi - tion to a balanced feed. The Moxon is basically a compact version of a 2-element Yagi with folded elements, designed for a single band, with a feed-point impedance very close to 50 ohms, and offers good forward gain and very good front-to-back F/B ratio. For 10-meters, I tend to use PVC booms, which keep the elements well insulated and distant from detuning effects. Jul 22, 2021 · BETAFPV Moxon FPV Antenna 2. 9 • F/B ratio 20/15/10m (dB): 23/12/27 Antennas/Moxon; The title of the main category is Moxon and it deals mainly with Links to moxon antenna resources. Resources listed under Moxon Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Build a 10-Meter Moxon Antenna John Portune, W6NBC, and Jim Bailey, W60EK f you have a Technician-class ham license, you have privileges on the 10-meter band. the moxon rectangle is growing in popularity as a compact 2 element array that approaches a full size 2 element in gain but with a far superior front to back ratio and a direct match for the standard 50 ohm coaxial cable . However, the Moxon can be built using an aluminum boom with suitable insulating plates. Designing MOXON Rectangles by Equation and by Model A quarter wave coax, shorted at the end shows an infinite impedance. I fed it with 2 watts from my IC 910 and swr is 1. As per the design, the coaxial cable could be attached directly to the driven element. 3/6. (Only those coax cable types for which data exist at the chosen frequency will appear in the chart) Utilizing a professionally designed RF PCB substrate and optimized the bandit series the Bandit Moxon antenna is ideal for long-range applications. John's MOXON on a push-up mast. Jul 21, 2011 · The FT817 has a SWR display built in. The results can be displayed in millimeters, feet, or inches. Sourdis > Cc: towertalk@contesting. With a piece (9. com Subject: Re: [TowerTalk] Coaxial Moxon A quarter wave coax, shorted at the end shows an infinite impedance. I haven't worked with Moxon type antennas in the past. John's design, a 17 meter Moxon, was built and tested with good results using this same technique. I have it assembled and I cannot get a better SWR reading than 1. : (in this view the coax is a thin RG-174 I used for inicial testing) - At the end of the Coax I add a female SO-239 that will be tied in the fish pole. Vlatko says "It works nice, looks nice . These initial steps into developing a tri-band antenna around a 20-meter Moxon tend to stop short of something truly satisfactory. The dimensions aren't typical however, this is what it took to get its SWR low. The nanoVNA says the SWR is below 2:1, and I didn’t check beyond that. Sep 26, 2023 · The coaxial cable has to be connected at the centre of the driven element. A 20 Meter Moxon Antenna Moxons work great — and they take up less space than full size two element Yagis. He did this with a wire moxon that was pulled out using just one point at each end, like a hammock. 5:1 into 50 coax across the 17m band as measured using the MFJ-259B. Sep 23, 2022 · These Moxons seem to need a balun or a choke to prevent the feeder coax screen becoming one element with half of the driven dipole. Disassembly requires a small diameter rod to depress the spreader quick release Jan 21, 2025 · 70cm, Collinear Antenna From Coax 440 Mhz J-Pole Antenna plans Here is a 70cm (440 Mhz) J-Pole antenna that is inexpensive, and easy to build. Is it >> possible what is described in the link? >> > > > A coax just a little bit shorter than a quarter wave shows a VERY quickly > changing inductive reactance so you can change the stub length +/- a few > centimeters and find Moxon Rectangles for 6 Meters L. The white standoff fasteners are coax cable tie-downs that I found at the hardware store. The tips of each element are bent towards the other with the ga being filled by an insulator to help support the ends of both elements. I tried several meth- Mar 27, 2021 · Hey folks, I’m having trouble getting any real range (> 30 feet) out of my t-beams and I’m wondering if the stock antennas are to blame. How big is a 20 meter Moxon antenna? A 20-meter Moxon antenna would have approximate dimensions of about 10 meters in width and 2 meters in height, although specific measurements may vary based on design. With a piece (26 cm) of RG8 coax cable the LC circuit resonance on 14. 73, Steve G3TXQ Dan Zimmerman N3OX wrote: >> I have looked at the pics and dont see why the >> antenna would not work. 4. The Moxon rectangle is a quite broad-band antenna, but it is not quite broad enough to cover the entire band. com > > David, > > I don't see any connection to the shield of the coax used in the > driven element or the reflector (see drawing, "Center Conductor only > is Apr 11, 2017 · I ordered the MFJ 10 meter moxon beam from HRO. Moxon antennas - for one single-band, a compact two-element beam antenna with good gain and very good F/B ratio. 0 MHz it is 2. To correct this phenomenon, we will make a coaxial choke and put it under the antenna out of the RF field. 4Ghz Long Range FPV Directional Antenna 5. Easy to build two element antenna! 2. It also delivers 3. com] On Behalf Of Brian Machesney > Sent: Monday, August 04, 2008 8:08 AM > To: David J. Easy match to 50 ohm coax. This JavaScript-based Moxon Rectangle calculator allows you to determine the dimensions of your Moxon antenna. It's a great Saturday antenna project especially for new hams seeking their first gain antenna. For convenience, the cable impedance is fixed at 50 ohms, as this is the standard for most users. 67 lbs. It requires only one coax feedline and includes a 3kW balun with SO-239 connector. If you have tried the Moxon Generator program to design a Moxon Rectangle, then you are familiar with the Moxon antenna. Do they still need a Balun to go from unbalanced coax? Is the Moxon inherently unbalanced or balanced? Apr 30, 2018 · Not related to the design for mounting. 5-6 dbi of gain and a 25db front to back ratio. Each driven element is separately fed with RG-6, 75 ohm's TV coax. Adjust the coax for minimum pull or sag on the driven element. > > The radiating elements are the *outside* of the coax shield. There is a 270 deg phasing line running from the driven element to the reflector. 67/10 Last updated: 2023-11-19 Sep 6, 2024 · I soldered a bit of RG-316 onto the driven elements and used a simple screw-terminal BNC connector on the end of the coax. Coax from the transmitter is connected to a 3 turns link of 1 mm insulated cu-wire. But I was not happy to cut my 10 m coaxial cable with pre-crimped PL 259 connectors at both ends. However, there is nothing to prevent the use of a choke. Is it possible what is described in the link? David Steve, k4mmg asked me to share my design of two coaxial Yagi antennas I made for use on 6 and 2 meters. I needed to find a common mode choke, also called a 1:1 balun or RF line isolator, that is effective on this 10 MHz bandwith. This antenna features an additional third element for 6m, which leads to a particularly high gain on this band. He feels that this is a somewhat unfair test but the Sterba is the only other antenna that he has. The LC circuit consists of about 19 turns of 16 gauge enamelled or cotton covered copper wire wound on a one inch dia teflon rod. Cebik, W4RNL I often receive inquiries from folks who cannot quite support the width of a 10-meter Yagi (either 2 or 3 elements) because obstructions give them less than the 16. Although the individual elements of the coax square are only about 2/3 the length of standard family elements, the perimeter length of the coax square is nearly 80% that of the Moxon shown in Fig. 5 is small enough to be used with no tuner for even the most discerning transistor finals. 4G/915MHz/868MHz TX module. The boom, mount and mast are Schedule 90 and 120 PVC and the elements are drawn aluminum tubing from Texas Towers. No change of SWR results at either height. The Moxon antenna is designed and manufactured by BETAFPV for the 2. Another thing I noticed was angle that your coax/feedline ties into the Moxon needs to be in the same plane but perpendicular to the element. A short coax stub with a coiled coax choke balun, connected to the output of the tuner, takes care of both the balance issue and keeping common-mode RF off of the coax run from my rig to the tuner. Dual band Moxon antenna (2 + 3 elements) for 10m and 6m, ideal for Sporadic-E or DX. The Bandit Moxon features a heavy-duty RG402 coax to optimize signal transmission and reduce external interference. 7 and 50-52 MHz, requires only one coax feed line, and the This technique contributes to a simple and efficient design for the user. Les was looking for a compact design for the HF bands when he asked the question: what if I fold in the ends of a dipole antenna to reduce the amount of space an antenna occupies. It also provides a direct match to standard 50-ohm coaxial cables. 17 m reduced size coaxial moxon rectangle, an exercise with an MFJ 259B plans by N0KHQ The Coaxial Modified Moxon Rectangle An explanation by N0KHQ/St. 4 at 28. Both will be on the same mast using the same rotor, but separate coax feedlines. 2kg (13. This way, it has negligible effect on the polar diagram or tuning. I often include a 1:1 choke balun (to prevent common-mode current on the coax shield) by strapping it to the mast. The driven element and the reflector are the same size electrically. Moxon for 10 meter, EA2BD: Build a 17 Meter Reduced Size Coaxial Moxon Rectangl: Building the 6 Meter Moxon Antenna: Building Moxon antenna 10-15-20 mt, DU1RZ: Dualband 17m/20m Moxon, N3OX: Experiments with a Moxon Rectangle antenna, IK1ZYW: Homebrew Cobweb or Moxon, 2E0VOV: Moxen project, N2YET: Moxon 30 - 40m: Moxon 3 inches below the connection for driven element on the coax, I installed a Palomar BA-58 1:1 current balun bead set so I wouldn't have to add extra coaxial loss. Jeff, KG6GXV assisted John install his antenna. 6. If I lay the With the design with Moxon elements as radiators we achieve several benefits like for example the very short boom length, an excellent front/back ratio of more than 30 dB and a large bandwidth. The antenna also features a customized 360° swivel RP-SMA socket to allow for position adjustment. The feed line (2) paralleled 1/4 wave 75ohm pieces of coax interrupt the phasing line at 1/4 wave. The addition of a 10- meter director and a 15-meter reflector yields some forward gain, but the feedpoint impedance makes large excursions, forbidding the use of coax. About MFJ-1890 - 10-Meter Moxon Beam This rugged close-spaced 2-element Yagi has a driven element and reflector with the tips folded toward each other to minimize turning radius. It is basically a 2-element parasitic beam with the tips of the elements folded towards each other to form a rectangle about 30% smaller that the equivalent beam. The 12V is fed via a length of thin microphone type coax, which runs along and down the director side guy rope. Craig used weather-protectred coax connectors near the mount for convenience and installed a 1:1 toroid balun inside the boom near the feedpoint. The Moxon antenna is a directional antenna with a high gain of 5. Jun 13, 2016 · Concerning local networks and infrastructure in the Survivalist communications realm, it's vastly important to recognize the assets provided by Low Power, also known as QRP, and highly directional antennas to both focus our radiation pattern along the azimuth or direction we want it to travel and to make the very most out of our transmitting… High SWR's don't so much affect the radiating efficiency of an antenna, but they do cause increased transmission line losses when fed with coax. The installation of an SO-239 coax connector on the 6 meter Moxon adds a bit of reactance to the feed and it is best to attach the coax directly to the driven element. Attach a single coaxial cable with a PL-259 connector to the coaxial pigtail using the included SO-239 connector. Further Notes on 40-Meter Wire MOXON Rectangles . When I first set the antenna up, the coax cable was hanging down the side of the driven element, and a couple of bars of the SWR display were lit up. Moxon’s “HF Antennas For All Locations” for many, many years. Two nested, horizontal moxon elements provide a good gain and an excellent forward/back ratio at very small dimensions. Jul 2, 2015 · problem in running higher power depending on the type of antenna. Super simple to make, really easy to solder the corners and coax on. Co-phasing involves placing two (or more!) identical antennas either side-by-side or one over top another (“stacking”) at a certain distance apart (usually a 1/2 Wavelength or more) and feeding the antennas in-phase. David HK1KXA EC5KXA Date: Sun, 3 Aug 2008 21:07:07 -0400 From: n3ox@n3ox. The Black Sep 17, 2016 · Figure 1 – Moxon Element Separators, 15m (top) & 17m (bottom) Figure 2 shows the reflector elements for each antenna as secured to the joists, looking north through the attic. For this application, I am using a highly efficient 4:1 balun (the design by Charles Greene W1CG) at, or very close to, the feedpoint, and using my Elecraft T1 atu to tune close to 1:1 - then coax to May 21, 2024 · Building A 2-Meter Moxon; – Coaxial cable wound on a large toroid – A number of ferrite beads placed over the coax cable or some clamp-on ferrites N0KHQ "John" has been testing his Coaxial MOXON on a daily basis comparing it against his Sterba Curtain as a reference. Not only for Sporadic-E QSOs on the bands 10 and 6m, the 2850MOX antenna made by EAntenna offers a high gain with very compact dimensions. I figure the 17 mtr moxon will be about 3-4 ft. 2 mm welding rods (aluminium for elements and brass for moxon - you need solder coax) 16 mm diameter plastic tube from Hobby Market. 3 MHz. At the feedpoint there is a coax balun, just a few turns wound on a round plastic body. Mark's homepage can be found here. Anyone who has tried vertrical dipoles and vertical Moxon antennas knows that the impedans at the feeding point changes depending on the position of the used coax cable The title of the main category is Moxon and it deals mainly with Links to moxon antenna resources. 3 for contrast. 6dBi 49mm Coaxial Cable SMA Male Compatible for Remote Controller/Receiver Drone FPV Quadcopter TX/Radio-White, 2pcs Please note: There is a sticker over the Antenna connector. 9 ft. Add the L shaped driven elements of moxon antenna . 12 MHz. With a basic HF transceiver and this Moxon antenna, you can make contacts around the world. Author use 1/2 inch copper pipe, and the associated fittings necessary. But I moved the coax away from the driven element, so it was hanging at about 45 degrees, and the SWR dropped right Jan 6, 2021 · What is a Moxon antenna? •A 2 element Yagi (reflector and driven element) •The frontal lobe is broad 70° to 80° •The f/b ratio is quite good 25+d but … I am contemplating building a moxon like W3CCR's moxon (20 mtr), and also a 17 mtr moxon in the same fashion. Building a 2-Meter MOXON . The Six Meter Moxon Antenna 1. the coax. The Moxon Rectangle is growing in popularity as a compact 2-element array that approaches a full-size 2-element Yagi in gain but with a far superior front-to-back ratio and a direct match for the standard 50-Ohm coaxial cable. SM0DTK'S 20 Meter Corner Fed Vertical Moxon. I tried it on a short piece of coax towards our local 1296 Mhz ( not 1269 ) Beacon and the f/b ratio is indeed very noticeable. Build a 17 Meter Reduced Size Coaxial Moxon Retangle. Epoxy Glue for coax fixing in holder and for moxon joints Thanks for all the comments on my recent Moxon Antenna project video. It eliminates the adjacent band problem that Cebik mentions in his Moxon pages. Wire MOXON Rectangles for 40-10 Meters . This one is a pretty worthwhile modification. The measurements were taken at 12 and 22 feet above ground. Even the popular ones on amazon have very mixed reviews, so I’m hoping someone with some actual An Aluminum 2-Element Moxon Rectangle 10m L. Dec 18, 2016 · The logical next step was to feed them out-of-phase. antenna with 450 Ohm or open-wire window line. I have more notes if anyone is interested; in the interest of keeping things simple, here is a photo. Building an Aluminum Moxon Construction techniques vary with individual builders. Add the insulated seperator between the driven element and reflector of moxon and the antenna is ready for connecting coax. The document analyzes the antenna performance using modeling software, showing it has good gain across the 2M band with high Jan 1, 2024 · A Moxon antenna typically has a gain of around 3-6 dBi, depending on its design and construction. 5 dBi - 10m - Relatively compact dimensions - Front-to-back ratio is very good; 12dB on 6m, 21dB on 10m - Flat SWR curve over a wide bandwidth The 2850MOX Dual Band Antenna covers 28-29. ferrite beads surrounding the coaxial cable transmission line, or from wire wound on a toroid core, or from a choke made from a closely spaced coil of four to six turns of turns of coaxial transmission line formed around a 5 inch form. The 2850MOX Dual Band Moxon advantages: - Radiator configuration offers high gain: 8. A 1:1 choke balun, whether in coax or as ferrite cores/beads, to me is the most useful form of the balun. The resource has been on our site since Sunday Sep 11 2016, and it has been viewed 2418 times. ). The coax in this case runs in the RF field and picks up the RF and it is routed down the outside of the coax. . You can learn more about John's Coaxial MOXON by clicking here. The metal plate attached effectively to the braid of the coax certainly had some negative effect! So now I had a working 20m moxon beam. At 29. Without a choke, the maximum permissible transmission power is about 7000 W. 5 cm) of RG58 coax cable the LC circuit resonance on 28. The result would be poor impedance matches and increased sensitivity to ambient interference. Chart of losses in dB against coax length, for multiple coax types, at a single frequency: Chart comparing losses in dB between multiple coax types against coax length, and at a chosen frequency. NEW We've also developed a couple of "custom" antenna designers, for more specialized antenna types. N0KHQ "John" has been testing his Coaxial MOXON on a daily basis comparing it against his Sterba Curtain as a reference. >> > > > It does work, in a way. MFJ-1895 for fifteen meters spans sixteen feet on a lightweight 67” boom. com/17mcoaxmox. Built and tested for our 2018 Field Day and worked excellent! David, I don't see any connection to the shield of the coax used in the driven element or the reflector (see drawing, "Center Conductor only is attached to feedline on both ends!"). Listed under the Antennas/Moxon category that is about Moxon antenna plans. In the above photograph Jeff is shown taping down the coax to the push up mast right above John's ham shack. This will reduce the amount of RF coming down the transmission The 1217MOX is a compact moxon antenna for the two WARC bands 12 and 17m. http://www. Mar 5, 2018 · Insert the reflector of moxon and bend it same from both ends same as the design. The Moxon Rectangle is a very popular limited space Yagi due to its very compact size. It looks to me as though coax is being used as wire with a very thick dielectric coating. net W3CRR's "Craig" 20 meter MOXON attached to his chimney. section of 1/2" pvc to hose clamp to my fabricated PVC mast. My first sat contact was using a Moxon built using corflute (plastic sign board) and self adhesive copper foil tape 1/4” wide. The aluminium construction and stainless steel mountings are designed for rough conditions, the maximum wind speed is 160 km/h. From the pvc T connector, I added a 2 ft. No tricky tuning required. Is it > possible what is described in the link? A coax just a little bit shorter than a quarter wave shows a VERY quickly changing inductive reactance so you can change the stub length +/- a few centimeters and find the exact value of reactance you need to load the antenna. The mast bracket on this Moxon is made from a synthetic kitchen cutting board. The interesting properties of the Moxon beam were discussed in detail in [2]. Andra prefers TV coax over RG-213 for better impedance match and far less cost. net To: hk1kxa@hotmail. 5 m of coax with connector to your Radio. The result is 3 db more than justRead More Coax feed--with a choke, of course--is the order of the day. Total length of the antenna is less than one meter and it is quite light so that it can be used as a hand held antenna. You can directly solder coax if you are using driven element made of copper . - M0MRR Above you can see the Moxon up and ready for action, the last picture shows the side of the antenna with the front and rear element 'joined' via tape and cable ties. 3 inches below the connection for driven element on the coax, I installed a Palomar BA-58 1:1 current balun bead set so I wouldn't have to add extra coaxial loss. Sep 27, 2011 · Ah, a Moxon design. It would probably work for a 17/15m Moxon as well with suitable component changes. Connect the coax feed line to the Budwig center connector and secure the coax to the mast. Multi-Banding the MOXON Rectangle . Jan 21, 2025 · 17 meter band antennas category is a curation of 37 web resources on , Moxon Rectangles, Dual Band Wire Beam 12 and 17 m, Coax Square antenna. You can of course use an capacitor of about 25 pF instead of the piece of coax. Jan 21, 2025 · Links to moxon antenna resources category is a curation of 72 web resources on , Moxon Rectangles, N2YET- Moxon projext, Dualband-Moxon-Beam for 10 m and 6 m. The vertical is fed by RG-213 coax, which is 4m shorter in length than the Moxon’s coax. com > To: hk1kxa@hotmail. This antenna can be mounted on a simple push-up mast and rotated by hand or with an inexpensive light duty rotor. The moxon can be further simplified by also eliminating the yagi's boom support. The resource has been on our site since Friday Dec 25 2020, and it has been viewed 819 times. Is it possible what is described in the link? Nested Moxon with wires and one feedpoint. It has a gain of just under 4 dBd and an excellent front-to-back ratio of 35 dB. I removed the center insulator for the 17M Moxon and reversed the leads so that the coax center conductor was now under the shield side of the 15M Moxon. Jan 22, 2024 · 70 cm moxon made from 6 gauge wire. Boom made from 50 and 55mm tube Elements made from 30 to 12mm tube Insulated guying of 20m reflector (longevity more than 25 years) Specifications • Forward gain in free space 20/15/10m (dBi): 6. this project involves constructing a dual band moxon antenna optimized for ham radio enthusiasts with functionality on both the 10 meter and 6 meter bands the antenna is designed to operate using a single 50 ohm feedpoint acting as a mini beam on 28 mhz 10 meters and as a 2 element yagi on 50 mhz 6 meters performance wise it offers a 4 0 dbd gain on 10 meters and 4 3 dbd on 6 meters with Antenna portable 2 elem. You can learn more about John's MOXON by clicking here. 5dbi to the front. An other benefit is the 50 Ω design, which let's u s avoid the use of a lossy balun as transforming element, the feed line is connected directly to the Personally, I think it would be fun to try it and see what happens with measured data :0) Bob AD5VJ >-----Original Message-----> From: towertalk-bounces@contesting. 0. Both antennas are mounted on top of the roof of a brick house in a quite dense populated area, with quite high ground water levels (estimated conductivity is 3-5 mS/m). 3 dBi - 6m, 10. What are the benefits of a Moxon antenna? Moxons are awesome. It also explains how to attach copper wires to the frame and terminate the coaxial cable using a PL-259 connector. 1 - 1. The Moxon antenna, developed by Les Moxon G6XN, is a derivative of the VK2ABQ square antenna developed by Fred Caton. High SWR's don't so much affect the radiating efficiency of an antenna, but they do cause increased transmission line losses when fed with coax. 4 : 1 over 2 mhz bandwidth. Louis Using an MFJ 259B or better, connect a coaxial tee to the analyzer, on one side of the tee install a 50 ohm termination resistor, the other side of the tee will be connected to the coax under test. The 2-element moxon structure for the 2-m-band was created with the help of the small program "Moxgen" [1] by Dan Maguire, AC6LA, and subsequent processing with EZNEC +6. net/a-vertical-moxon-antenna-for-20-meters/ This is my first Moxon attempted, I think the results are pretty decent & I can't wait to try it over salt water! A 1:1current mode ferrite bead balun was mounted with cable ties near the hub of the Moxon crappie poles. Aug 30, 2017 · The Moxon is recognized for about 10db higher front-to-back ratio, but is down about 1/2 to 1 db gain from a full-sized 20m beam (very small). 5 dBi on 6M; a flat SWR curve over a wide bandwidth; 3,000W maximum power rating; and front-to-back-ratio of 12 dB on 10M, 21 dB on 6M. Besides, the soldered joint is protected by an injection molding cover, making it a whole unit and very easy to install. This is a great antenna for taking advantage of the rise of Cycle 25. I know how to do it, after seeing the photo. For this application, I am using a highly efficient 4:1 balun (the design by Charles Greene W1CG) at, or very close to, the feedpoint, and using my Elecraft T1 atu to tune close to 1:1 - then coax to Nov 10, 2011 · The Moxon is fed with RG-213 coax and a few meters of RG-58 near the rotor. EAntenna's Moxon antennas are characterised by the implementation of the idea of their designer, Les Moxon, G6XN. So far it received 1 votes for a total score of 10. Yeah, that can get you to 50 Ohms, from what I've read. Sep 1, 2024 · The Moxon consists of a rectangle of ½" PVC pipes and a central "boom" with a tee that fits onto a mast made of 1" galvanized steel conduit. A good use for the MFJ-259B. M3KXZ'S QRP Beach Vertical 20m Moxon at Seaford Bay, England 1/3/06: All my working is HF QRP SSB and I usually rely on my 8 metre fishing poles, trusty homebrew non-resonant 44ft doublet antennas (one at home and one for portable) and also a 10 metre tall homebrew vertical at home. 73, Steve G3TXQ Dan Zimmerman N3OX wrote: >> A quarter wave coax, shorted at the end shows an infinite impedance. The whole assembly is on the top of my 33ft push up aluminium mast and then back to my radio via a 40ft length of RG213 coax. com > Subject: Re: [TowerTalk] Coaxial Moxon > CC: towertalk@contesting. 17 m 3 dBd, 20 m 3,6 dBd The antenna is fed with 50-Ohm-coax in the middle part of the 17-m-radiator (wire 10). (Epoxi adhesive could be applied to seal the welding against corrosion) Jan 1, 2024 · How much gain does a Moxon antenna have? A Moxon antenna typically has a gain ranging from 4 to 7 dBi, depending on its design and construction. Cebik, W4RNL. The Double-D Antenna . As it turned out come CQ WW SSB weekend it was too windy for me to use the moxon, but I have had great success working USA on FT8 since. David HK1KXA EC5KXA > Date: Mon, 4 Aug 2008 09:07:38 -0400 > From: nekvtster@gmail. Element length were calculated with MoxGen, resonance on the first try was a little below 14 MHz, but this was an easy fix. So let’s proceed to the Mini-MOXON project at W7XA Linear loading (making a folded back section) is somewhat mechanically complex and can add significantly This rugged close-spaced 2-element Yagi has a driven element and reflector with the tips folded toward each other to minimize turning radius. Excellent gain and Front to Back Ratio. > > Imagine Antennas/Moxon; The title of the main category is Moxon and it deals mainly with Links to moxon antenna resources. Resources listed under 17 meter category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. com > [mailto:towertalk-bounces@contesting. This effective design reduces the traditional Yagi to a size typically 30% smaller and utilizes no traps or other . The MOXON Rectangle on 2 Meters . John designed and built a Coaxial MOXON which employs RG-58 coax instead of wire for the elements to reduce the physical size of the antenna. Coax from the transmitter is connected to a 4 turns link of 1 mm insulated cu-wire. com > Subject Moxon Rectangle Notes. You can of course use an capacitor of about 10 pF instead of the piece of coax. So far it received 3 votes for a total score of 6. Those currents traveled along the shield of the coax cable which feeds my CG-3000 autotuner connected to a 15 m long wire with top hat capacity, covering 160 m to 30 m. Moxon joint - 4 perimeters 20% infill no support - 2 Pcs . How big is a 20 meter Moxon antenna? A 20 meter Moxon antenna for the 20-meter amateur radio band will have dimensions of approximately 10 meters (33 feet) in length and width. above the 20 mtr moxon. 5. msaph vcuh ksivf zuon tegcna dvysdzvm ocgvc otbad eeaew wuq