Omnidirectional FM antenna coupled with Band III dipole for DAB/DAB+ 7. The antenna is usable in the amateur bands from 50 thru 1300 MHz and is also suitable for FM broadcasting, scanning, VHF/UHF television air band communications, government applications, and business band use. 2 The first is horizontally po-. The MFJ-1890 10-Meter moxon antenna This rugged close-spaced 2-element Yagi has a driven element and reflector with the tips folded toward each other to minimize turning radius. MFJ-1890 for ten meters spans a mere 12' on a lightweight 50" boom. But this provided the >>> opportunity to look into other antennas and came across the PAR Moxon. The higher the gain (dBi) the further the antenna can reach while the spread of the signal from left to right is shown in degrees. The SE-6MB can accommodate masts up to 1-3/4" OD, and comes with a 1:1 Maxwell ferrite choke balun with UHF connector. Free shipping on many items (ADD AN ELEMENT AND MORE DB GAIN) $54. Designed as a 20m antenna. It is a directional antenna that provides great performance. The VK5JST Antenna Analyser Kit. I started this project after building my first mono band moxon for 15 mtr band. An antenna analyzer has to have a signal source as well. Moxon antenna is basically a two-element Yagi-Uda antenna , with a bent dipole element to reduce its height and is commonly preferred antenna for HAM operators due to its size, forward gain and wide band impedance match. 3 dB gain over a dipole. Used 2017 LEXUS RX 350 from Len Stoler Ford in Owings Mills, MD, 21117. The antenna can be built from aluminum tubing like conventional yagis but it also easily made from wire and bamboo spreaders similar to quad construction. It works nice with about 7 dB gain and 15 dB F/B hanging 12 meters above ground. The gain obtained from a two element beam antenna is 5 DB and three element antenna offers about 7 DB gain. I've been totally bitten by the satellite bug. G = (power radiated by an antenna)/(power. It is pretty flat across the entire 6m band with 1. With the HB9CV design, both elements are fed phase shifted, achieving a relatively high gain of about 5. 4dB), while the Moxon is about 3dB down, at 22. while flexing the cable and connectors. Weighs just 8 lbs. G5RV, OCF and other weird and wonderful antennas are a compromise to gain bands. mathematically ideal isotropic antenna, and dBd is a ratio of the antenna’s forward gain to a half-wave dipole antenna. The antenna is expected to produce a forward gain of 4. This gives the owner much better control over the match allowing adjustment over a wider frequency range. A quick note on Reflections. In telecommunication, the term front-to-back ratio (also known as front-to-rear ratio) can mean: The ratio of power gain between the front and rear of a directional antenna. A useful relationship between omnidirectional radiation pattern directivity in decibels and half-power beamwidth based on the assumption of a sin / b θ pattern shape is: D ≈ 10 log 10 dB. cost of reduced forward gain (and vice versa). 4 GHz and 10 dB bandwidth of 4. So I decided to make my own. No two Moxon's are identical save the dimensions of the elements and spacings. Element span is a compact 7 feet on a 34" boom with turning radius of under 4'. pdf ~390kB † The formula for equivalent diameter for a square conductor, 1. Hawking's HAWNU1 High Power Wireless USB Network Adapter provides up to 300Mbps on standard wireless networks. According to the Moxon Antenna Project, "The Moxon is especially attractive to hams who want to avoid purchasing more expensive towers and rotors, and desire a directional antenna. Although there are a few issues with this device, the positives sure do shine above them all. A horizontial moxon would be quite low profile compared to a Vertical Loop/Delta antenna. The Vertical Moxon can also be modified to produce a pattern resembling a Dipole. Ski Patrol) vs. This small Yagi has 5. the hd antenna can reach up to 120 miles and can be placed everywhere in your home. Element span is a compact 7 feet on a 34” boom with turning radius of under 4’. Constructed of 3/8" hard drawn 6063-T832 aluminum tubing, 6061-T6 aluminum, UV resistant PVC, and stainless steel hardware. The 20m Buddistick has greater forward gain, some rear rejection but considerable high angle radiation. W5PFGJan 16, Amtenna you,I have seen a 3 and 4 element Moxon. 3 dBi forward gain and 30 dB of interference killing front-to-back rejection! Mount anywhere using lightweight TV antenna hardware. 62 dB, which is much more powerful than the 4-inch antennas featured on many other weBoost products. Hi-VHF 4-Element Yagi Antennas - based on Dave47's antenna, designed per K7MEM (DL6WU) on. WW-X0418-Mod0: holl_ands Mod: NO Reflector Rods: Nearly Omni-directional coverage with 5-6+ dBi Raw Gain. 5 cm shorter than a Triax FM 5. Packed length only 119 cm. 3 dBi forward gain and 30 dB. A 20 Meter Moxon Antenna Moxons work great — and they take up less space than full size two element Yagis. The balance of the antenna is made with 6061-T6 aluminum, UV resistant PVC, and stainless steel hardware. The system includes 2 TYT MD-398 UHF handheld radios for the crew chief. The Moxon antenna is probably the best "bang for the buck" antenna you can build - and do it for about $100 dollars US. 1 shows the means of reducing the size of a typical 2 element yagi. Note that when a single number is stated for the gain of an antenna, it is assumed that this is the maximum gain (the gain in the direction of the maximum radiation). The MFJ Moxon antennas provides good performance with a minimum turning radious. 10-METER MOXON ANTENNA. The Unified S-band (USB) system was a tracking and communication system that combined television. Antennas proposed and developed here are based on Moxon antenna  which is one of the favorite antennas among the amateur radio hobbyists. Moxon Rectangle Antennas - Lighter and better than Yagi Post by Grzyadms4x4 » Tue May 19, 2009 5:00 am After I made my super duper collapsable folding/flexible yagi, I thought to my self, "self, this is great, but there's a lot of parts. The Yagi antenna or Yagi-Uda antenna or aerial is a particularly popular form of antenna where directivity and gain are required. EZNEC Modeling indicated approximately 6 dBi gain at around 10 degrees TOA. It works nice with about 7 dB gain and 15 dB F/B hanging 12 meters above ground. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Antenna gain is defined as antenna directivity times a factor representing the radiation efficiency. Directional (Yagi) Antenna Summary The directional antenna has a distinct gain pattern in the direction perpendicular to the elements, i. G/T is an important figure-of-merit for the antenna's overall receive performance, because it balances forward gain (G) against received thermal noise (T). but the Forward Gain fell to about 0 dBi in the vicinity of 542 MHz. Interestingly, the Moxon beam shows gain over a dipole (=2dbi) and a small F/B even on these higher frequencies. Weighs just 8 lbs. Description: Our single band and multi-band directional antennas, sector and multi sector antennas, omni-directional, ultra wideband planar spiral and helix antennas are designed to meet the highest specification. DDS control with Picaxe 2014: 53. W5PFGJan 16, Amtenna you,I have seen a 3 and 4 element Moxon. Even so, an antenna analyzer doesn't need a whole lot of accuracy to be useful, so you would think that more builders/hackers would tackle a project like this. However, I think your confusion stems from the fact that many instruments can ONLY measure S21. The Trap Master series addresses everyone's needs from power handling capabilities to frequency coverage. The next generation in Design and manufacturing. A helical antenna is an antenna consisting of one or more conducting wires (monofilar, bifilar, or quadrifilar with 1, 2, or 4 wires respectively) wound in the form of a helix. MFJ MOXON COMPLETE ASSEMBLY AND ANTENNA WALKTHROUGH HERE on CBRADIOMAGAZINE. Over the weekend I built three Moxon antennas for my attic antenna farm, once I realised that I could get a 20m version in there easily enough. Collectively we have all drawn on the experience of Les Moxon, G6XN, and his work to transform the VK2ABQ 2 element. We can see from this By Doug WIFB et's refer to the antennas discussed. 5:1 or less VSWR. EAntenna VHF and UHF Directional Antennas include exciting new offerings for the 50, 144 and 430 MHz bands. 915 MHz Moxon antenna is an extended range antenna developed for Frsky's 915 MHz remote control system, also suitable for Black Sheep's 915 remote control system. Moxon antenna is basically a two-element Yagi-Uda antenna , with a bent dipole element to reduce its height and is commonly preferred antenna for HAM operators due to its size, forward gain and wide band impedance match. harnesses which position the radio on top of your sternum. Deep antenna nulls are important to a DXer——perhaps more important than antenna gain in many cases. The MFJ-1890 is a lightweight aluminum antenna designed to operate in the 10 meter band and we had hoped that with a little messing around we could get it to tune to the 11 meter cb band. Have seen many 6m moxons but none that seemed simple and easy to reproduce. front-to-rear, F/R), gain (in the forward direction), feedpoint impedance (hence, SWR bandwidth), and side-lobes These characteristics depend in a complex manner on design parameters such as spacing between the elements and. A comparison with other existing high-gain wideband CP antenna arrays reveals that the proposed antenna offers an excellent trade-off between gain and antenna size, also demonstrated by comparing the theoretical limits of antennas in terms of Q-factor and aperture efficiency. An antenna with a higher gain is more effective in its radiation pattern. You can read more about it on my Moxon page. It has horizontal & vertical polarization twin feed, gamma matched to 50 ohms. Its gain would be in the vicinity of 0. 6m Antennas 4m 6m Dual Band Antennas 4m Antennas 2m Antennas Dual Band Antennas 2m 70cm 70cm Antennas 23cm Antennas 13cm Antennas Commercial Antennas Band Pass Filters EME2 - EME3 BPF LNA T/R Relay Low Noise Amplifiers Power Splitter Divider Combiner HF Antennas 2. PRACTICAL ANTENNA DESIGN 140 -150 MHZ VHF TRANSCEIVERS Online Edition ELPIDIO LATORILLA It has a gain of 1 dB (unity gain) compared to a real dipole. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. The system includes 2 TYT MD-398 UHF handheld radios for the crew chief. The stressed moxon antenna is a good compromise with a low weight and wind load together with forward gain. I've been totally bitten by the satellite bug. Horizontal HF antennas … benefit from nearby ground gain. Yeah, us too. nl down and made it a mirror site linking to this page. There are also complaints that this particular antenna is difficult to assemble, so be careful when you go forward to do that. While the wire version of the Moxon rectangle is a proven performer, a tubular version provides broader bandwidth and slightly more gain. The helical antenna is a unidirectional antenna that combines high gain with a wide frequency range. Some web sites suggest the Super-J has a full 3 dB gain over the plain J-Pole which is a pretentious claim obvious to anyone with a copy of the ARRL Antenna Book and other references. This antenna makes a great Field day antenna at my QTH as it can point north and cover most of the USA and Canada. MAKE ALL LENGTH ADJUSTMENTS IN THE HORIZONTAL LEG OF THE ANTENNA. I started this project after building my first mono band moxon for 15 mtr band. an isotrope radiator to compare its forward gain. (Note: Antenna gain is referred to as the gain over a fictional isotropic antenna which has the same radiation intensity in any direction. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. For more info see Wikipedia: Quad antenna, Yagi antenna. Back to the Moxon. After finding out what a "moxon" does, it became apparent that it would be difficult if not impossible. This gives the owner much better control over the match allowing adjustment over a wider frequency range. The plot below shows the moxon at 5 meter above ground, notice that the angle of radiation has now increased to 38 degrees with rejuiced forward and. Building the Moxon Antenna is fairly easy and lends itself to imagination. 88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. It is popular with Amateur radio enthusiasts for its simplicity of construction and great performance. The antenna is omnidirectional and has a forward gain of 5. All HB9CV models are nickel or chrome plated. 6 dBd and better than 17 dB front to back ratio (F/B). The Yagi was actually a bit quieter than this yesterday, but I've been playing with the. antennas is used to sharpen their forward receiving patterns, making the antenna nulls extremely “deep,” while producing a theoretical 3 dB increase in forward gain (actually closer to 2. The lower gain 2 ele-ment driver-reflector Yagi needs a 3. MFJ-1896 6-METER MOXON ANTENNA. 5 MHz at less than 2:1 VSWR, providing coverage of CAP frequencies too. I chosed a "gamma match" made from a piece of 3/8" aluminium tubing 7. This antenna is made for the DX'er or Contester that is looking for an antenna to work across the globe. The Antenna Farm : 2 Meter High Gain Antennas - VHF & UHF Mobile Radios Radio Accessories VHF & UHF Hand Held Radios Antennas Mobile Antenna Mounts SWR/Power Meters Adapters Coaxial Cable Two Way Accessories Antenna Accessories DC Power Supplies Coax Cable Accessories Amplifiers Connectors Aviation Radios Repeater Systems Towers & Accessories Scanners & Receivers Duplexers Diplexers. The design gives the antenna good forward gain and front to back. While one may list an average gain of 12db, another may list 12dbd or 12dbi. I did, and it does. Modified Vertical Moxon Gain Pattern / 2db Forward Increase. ARRL Product Review of the M2 6-Meter HO Loop Antennas. Elements are powder-coated white for long-lasting durability in harsh environment conditions. This antenna produces 5 dBd forward gain with an excellent front-to-back ratio, and solid aluminum elements with 360° welds prevent intermodulation and provide exceptional strength. Pattern Plots An Intro to plot types, ARRL Style+Standard, normalised and non-normalised gain axis, reading data like F/B, F/R and side lobe magnitudes from the different antenna pattern plot types; Antenna Software An Intro to NEC and MININEC base Antenna Modelling Software and add-on Antenna Temp. The antenna that is below the quad is a 6 meter moxon that is made from TV tray legs!. 2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. The Moxon design has the end parts of the element bend at 90 degrees which helps save space. The antenna patterns show up more clearly in PDF, so here's the report: moxon_realitycheck. Optional Accessories. The closed-space 2-element yagi design delivers a cardioid pattern. If you were going to combine multiple antennas, then those antennas should be stacked in a co-linear vertical array that will provide increased gain towards the horizontal, while maintaining a circular pattern in the horizontal plane. Both antennas have a similar radiation plot, with the Moxon showing almost no penalty in forward gain compared to a full 3el. The gain of the antenna is like a 3 element yagi and the front to back ratio is about 8 dB. Figure 1: Two-element Yagi and general Yagi geometry. This single antenna system provides antennas for four different ham radios. Vertical omni directional antennas and collinear arrays are used for line-of-sight communications with ground-based mobile units. The vertical monopole antenna with a corner reflector shows a peak gain of 7. 8:1 or less. Its a bit bigger than the loop might have been, but it fits just fine >>> on the rover mast and has some gain. Assembly was easy and I had it together and tuned in 15 minutes. The high-gain antenna makes the 3G-M a great booster for places that are far away from the nearest cell tower. So you wouldn't bother. Moving to the Moxon design also saved me quite a bit of space. (Hexbeam, Spider Beam, Moxon and others of their ilk will give you about 4. See the complete profile on LinkedIn and discover James’ connections and jobs at similar companies. It is a relatively small antenna with a gain of about 6 dBi, and has a mostly one-sided radiation pattern with a front-to-back ratio greater than 25 dBi. Building the Vertical Moxon. A perfectly matched resonant dipole will give you 0. This beam is a 2-Element-Yagi with radiator and reflector and reduced size to about 75% of a normal beam. The Moxon with a 67 deg. According to a former Apple Wi-Fi engineer, however, the best. The antenna is broadband, has a broad (100 degrees) front lobe, a good front-to-back ratio and a useful amount of forward gain and presents a decent near 50 ohm match at resonance. Product Summary. 9 ft) above the ground, fed with 45 meters (147 ft) of RG-213 coaxial cable. 0 forward gain for long tracks. Very High Gain YAGI Antenna 890-960 MHz The SAM-91313 is designed for those situations where maximum gain is required, or where a narrow pattern is necessary to prevent interference. binnsgenealogy. 6 of the full Yagi, wich explains the similar forward gain also. It came in its own box and has a male adapter that sticks out the top for the antenna to screw on to. According to the Moxon Antenna Project, "The Moxon is especially attractive to hams who want to avoid purchasing more expensive towers and rotors, and desire a directional antenna. Its gain would be in the vicinity of 0. YAGI ANTENNA. (3/2 λ) doublet with 31 (1/4 λ) ft of ladder line, then fed with coax. cost of reduced forward gain (and vice versa). The antenna that is below the quad is a 6 meter moxon that is made from TV tray legs!. THE MOXON ADVANTAGE: A Moxon beam can be expected to provide approximately 5. 10-Meter MoxBeam, KG4JJH 1 of 12 10-Meter MoxBeam Build this Moxon antenna using some unique materials & be ready for Solar Cycle 24 was excited to read on the Amateur Radio News1 that "the recent appearance on the sun of two so-called "backward sunspots" may mean solar Cycle 23 is drawing to a. Although the radiation off the forward lobe of the Moxon is much less than the yagi its forward lobe is wider and shallower. Manufacturers of High Quality Amateur Radio / Ham Radio HF Yagi, Transmitting and Receiving Antennas. This antenna has a very good F/B and bandwidth (works from 27. Jeff , VE1ZAC This is not a new idea, but the method I am suggesting of doing it is novel, and possibly simple to implement ! The caveat is that it is fussy and unique to each antenna situation. The regular Moxon rectangle is an excellent antenna, but somewhat lacking in gain. I also optimized a European version with metric dimensions for 87. As he rotated his antenna on transmit, I saw his signal change from 15db over 9 to S6 and back up. Plus the antenna also have the great low noise floor and wide bandwidth typical of our other antennas. Elements made with 14 and 12mm tube. 5 dBi of gain, a rugged weatherproof radome and N-type female connector. 01 This note looks at the antenna and antenna model for the 40 meter Moxon Yagi designed by Dave Leeson, W6NL. In this situation, the beam would need to be fed using ladderline and a tuner would be required. PDF | Novel circularly polarized (CP) antenna configurations derived from Moxon type antenna (bent dipole element over a ground plane) for broadband UHF SATCOM applications. 1 dBi for the two-element beam. The length of a line from the origin to any point on the surface is proportional to the gain in that direction. This is the Antenna Specialists "Super Scanner", an electrically phased combination beam/omni antenna. Some web sites suggest the Super-J has a full 3 dB gain over the plain J-Pole which is a pretentious claim obvious to anyone with a copy of the ARRL Antenna Book and other references. It's a great Saturday antenna project especially for new hams seeking their first gain antenna. Com-Power’s AT-812 Tripod and AM-400 Antenna Mast, are the recommended supports for this antenna. The Yagi antenna is the most common construction form for a “beam” antenna. MFJ 6-Meter Moxon Antenna MFJ’s 6-Meter Moxon for limited space features low SWR and a broad cardioid pattern with 5. The threshold power required to power up the tag is constant (power on tag forward). The boom length is a very short 40 inches. 9 dBi gain and you put 100 watts into the antenna, it will behave like 1548 Watts in the forward direction. I pointed the Moxon antenna in the right forward direction, and had hoped for some gain. S-parameters for an antenna are introduced. Used 2017 LEXUS RX 350 from Herb Chambers Lexus of Hingham in Hingham, MA, 02043. They're my favorite antenna for Field Day and a great antenna to build for summertime 6 meter band openings. A 3 dBd gain antenna is a good compromise for use in suburban and general settings. It is a directional antenna that provides great performance. MFJ-1890 for ten meters spans a mere 12’ on a lightweight 50” boom. W5PFGJan 16, Amtenna you,I have seen a 3 and 4 element Moxon. The Mag 145 PL is the magnetic base to which the antenna attaches. pdf ~390kB † The formula for equivalent diameter for a square conductor, 1. Latest NEWS: THE FMR Yagi, a antenna with a exceptional tight back. It's winter-storm tough but extremely lightweight, under 5 lbs. This antenna was marketed as the answer for those people who wanted to run both a directional beam antenna, and an omni-directional ground plane antenna, but either could not afford to, or did not have the space to put two separate antennas up. This antenna can be mounted on a simple push-up mast and rotated by hand or with an inexpensive light duty rotor. MFJ-1890 for ten meters spans a mere 12' on a lightweight 50" boom. BUILD A 2 METER YAGI AND 6 METER. Our goal is to be able to compare records with other observers, even those using different types of antennas like a Yagi or a Moxon. 4 GHz), and the air-gap E-patch antenna shows a gain of 6 dBi at 2. Reviewed by Bob Allison, WB1GCMAssistant Laboratory Managerwb1gcm@arrl. It is small in size Easy to mast Balanced to 50 Ohms Near 1:1 SWR Excellent Front to Back (F/B) ratio Large bandwidth Large beam-width angle Here I have given the measurements of…. I wasn't interested in outright gain, but wanted something which was a) small and light, b) cheap and c) offered a little gain and some front to back. The performance of the antenna, through the model, will be explored in several typical settings. At a height of about λ/2, the nearby ground reflection of a horizontal HF antenna will start to be constructive at interesting take-off angles for long- distance ionospheric contacts. Eggbeater II Omni LEO Antennas. At the same time, the rear lobe is minuscule (compared to a front-to-back ratio of about 10- 12 dB as typical of a full size 2-element Yagi). Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. Amplifiers and Modulators. Element span is a compact 7 feet on a 34" boom with turning radius of under 4'. For most VHF uses, it is the pattern shape, with its very high front-to-rear ratio, that holds more interest than the antenna's gain. Ski Patrol) vs. For moderate numbers of elements, the forward gain is proportional to the number of elements. ost commercial 2-meter repeater antennas with gain fall into two categories: collinear arrays and stacked element arrays, with gains ranging from 3 to 9 dB1. Maco M105 Assembly Instructions Includes part lists, schematics, and assembly 5 Element/ 11 Meter Base Antenna "Maximum Beam", Boom. This antenna can be mounted on a simple push-up mast and rotated by hand or with an inexpensive light duty rotor. A 3 dBd gain antenna is a good compromise for use in suburban and general settings. A ground plane. The True-Mox is a self-balancing moxon antenna. It isn't a true Moxon designed with his formulas - that would have shorter elements, a little less gain, and a lot more F/B. binnsgenealogy. 1) The antenna has about the same gain in both front and rear direction, about -3dB on the sides. The antenna was fixed on Europe, had a beamwidth of around 55 degrees, provided at least 3 dB gain over a single 2 element array, and had a very large null off the side. To interpret this diagram, imagine that the antenna is at the origin. 3 elements yagi: 6-10-12-15-17-20m. an isotrope radiator to compare its forward gain. And a lot more problems. Elements are powder-coated white for long-lasting durability in harsh environment conditions. The antenna is modeled using. As a receiving antenna, the gain. HF Yagi, HEXX Beam and Rotatable Antennas Choose from top-brand HF Yagi, HEXX beam, and other rotatable antennas to meet your high-frequency needs. In practice, you have to think of them not like a laser beam to aim at your target, but a cone to keep on target while you minimize the noise from other. The null was strategically oriented towards the USA so it would be easier to run Europe when the band was open. I've been totally bitten by the satellite bug. SAL Electronics SE-2M 2 Meter Moxon Beam product reviews by real people like you. It would be most interesting to hear of constructors using this design on other bands. rated gain in all directions ? No. Although lower gains would be directed toward users closer to the base station antenna, less gain should then suffice. This efficiency quantifies the losses in the antenna and is defined as the ratio of radiated power (Pr) to input power (Pi). For installations on angled supports, the “U” mount allows mounting to virtually all angled supports up to 3. 5 λ circumference. In the SWR. 000+ links organized into 600+ categories and subcategories. Software modeling of the Moxon antenna shows that it has about 6dbi of gain and about a 25db front to back ratio. This antenna has a very good F/B and bandwidth (works from 27. Most simple, nondirectional. Mount it on your roof as many do and work DX you never even heard with your vertical or dipole. Fully digital system for endurance racing. I pointed the Moxon antenna in the right forward direction, and had hoped for some gain. Both antennas have a similar radiation plot, with the Moxon showing almost no penalty in forward gain compared to a full 3el. The Moxon rectangle is a quite broad-band antenna, but it is not quite broad enough to cover the entire band. Forward Gain and the Front-to-Back Ratio are excellent for these very broad 50 Ohm Impedance antennas. 88 m boom length for the lower 144 MHz SSB/MGM band, I used it mainly for Sporadic-E and MS contacts. According to Cebik's pages on wire beams, compared to the X, hex and vk special, the moxon has the greatest forward gain and the greatest front to back of all wire beams he reviewed. 5-dBi forward gain, high front-to-back ratio. Building a Vertical Moxon presents some challenges. Used 2017 LEXUS RX 350 from Herb Chambers Lexus of Hingham in Hingham, MA, 02043. The null was strategically oriented towards the USA so it would be easier to run Europe when the band was open. This is a two-element beam offering about 3dBd gain and massive 30dB front to back. dBi is the amount of focus applied by an antenna with respect to an "Isotropic Radiator" (a dispersion pattern that radiates the energy equally in. A 2-Meter Vertical Dipole Array Build this 2 or 4-Element VHF repeater antenna with up to 9. 5 dBi forward gain; the advantage being moderate forward gain, with reduced rear gain, and nulls off both sides. WISP Antennas & Accessories Engineered to Exceed. Element span is a compact 7 feet on a 34" boom with turning radius of under 4'. 5 MHz to 151. As a quick summary, antenna forward gain is usually considered to be relatively insensitive to (reasonable) phasing network errors. This is complete antenna with quick release system, which we developed to mounting to most transmitters or on tracker. It adds up to about 12 dBI. The proposed CRLH LWA has the ability to scan the main beam from-40° to 40° by sweeping the operating frequency from 7. Fully digital system for endurance racing. 4 GHz), and the air-gap E-patch antenna shows a gain of 6 dBi at 2. If you would use just the director on your two element, you would have more forward gain, but you would also not have any rejection of signals coming from direction B, that is why its F/B or Front to Back ratio is zero. 1 to 1 where I operate. For the antennas that are prototyped, return loss S11 measurements were performed, and gains are simulated using HFSS. In this elevation plot, the take-off angle is 28 deg corresponding to 70 ft antenna height. binnsgenealogy. Last update 12-04-2013 : Added 3,60 DX-Beam 11-3el Yagi and the 5,40 5el WULF in “eznec battle. Recently I bought a 2 element Les Moxon loop for 11m, I live in a small apartment here so a small antenna with some gain was needed, the boom is 4. It's winter-storm tough but extremely lightweight, under 5 lbs. The azimuthal plot helps to explain the lower forward gain of the Spiderbeam: it is wasting more energy because it has a radiation lobe almost 80 degrees wide. EAntenna VHF and UHF Directional Antennas include exciting new offerings for the 50, 144 and 430 MHz bands. com This entry was posted in ALL Articles , ANTENNA'S , Directional Beams by Greg 43AX005. 3 dBi and the front to back rejection is listed as 30dB. CAP frequencies covered at 1. According to the Moxon Antenna Project, "The Moxon is especially attractive to hams who want to avoid purchasing more expensive towers and rotors, and desire a directional antenna. Hybrid antennas are, put simply, log periodic antennas with the feed lines. Due to poor supply from the factory we are unable to offer for sale at this time. MFJ 6-Meter Moxon Antenna MFJ's 6-Meter Moxon for limited space features low SWR and a broad cardioid pattern with 5. Moxon Antenna For VHF/UHF FM/Ham Dxing. SPECIFICATIONS Frequency (continuous) 415-450 MHz Elements 7 Gain (typ) 10 dBd Dimensions (L x H) 41 x 13 in. Although the radiation off the forward lobe of the Moxon is much less than the yagi its forward lobe is wider and shallower. dB(isotropic) is the forward gain of an antenna compared to the hypothetical isotropic antenna, which uniformly distributes energy in all directions. 5-dBi forward gain, high front-to-back ratio. 5:1 or less VSWR. Call 980-365-8851 for more information. The Trap Master series addresses everyone's needs from power handling capabilities to frequency coverage. 5 MHz to 151. As he rotated his antenna on transmit, I saw his signal change from 15db over 9 to S6 and back up. 6 dBd and better than 17 dB front to back ratio (F/B). 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. MFJ 6-Meter Moxon Antenna MFJ's 6-Meter Moxon for limited space features low SWR and a broad cardioid pattern with 5. As with all "beam" antennas, performance characteristics of a Yagi antenna are front-to-back ratio (F/B, a. 1db) loss @ 180 degs. It came in its own box and has a male adapter that sticks out the top for the antenna to screw on to.