2 meter quad antenna calculator Stacking two indentical antennas can result 2. 8/Frequency ( Mhz ) If you don’t have a dip meter then once all the elements are in place the driven element may Horizontal or vertical polarization of an cubical QUAD-Antenna is determined by placement of the feed point (feed gap on the driven element) Parasitic elements need to be mounted in the same orientation as the driven element. 8; ERP Calculator; 59+ software; Magnetic Loop Calculator; MeterMate; UDY 2 Voice Keyer; 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; My NEC-2 computer optimized antenna, that I call the “Freeband 4”, sacrifices about . Have used them on 2 meters and 70 cm also. This two-element quad has 11. All directors are optional. Simple j-pole antenna for 2 meter how to build a J-pole antenna for 2 meter band with many photos ecc. I bought 4-6 ? round wood dowels about 36" at a craft shop the wife drags me through once in awhile. The desgribed Gamma-match is used for 11 meter Yagi’s with an aluminim element thickness around 25mm !!!!! I am however convident that with slight adjustments it will work for other diameters. As shown in Figure 1, a good 10- meter quad can be built from two wire loops. 554 meters, and the dipole leg length is 19. 12mtr 70Mhz Quad; 5el 3. Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. The SWR chart on the right show the General Coverage antenna's SWR performance, within the 15 Meter band. Enter center frequency to be calculated for a quad : mHz. It aids in determining the total length (L) of a delta loop antenna in meters, based on the desired wavelength 2 meters quad Antenna by IZ3AYQ The antenna can be tuned for 145 or 144 MHz, and used in vertical polarization (as in this picture) or in orizontal polarization. Amateur Vertical Antenna Calculator This basic calculator is designed to give the aproximate length (height) of a particular vertical antenna, for the frequency and wavelength chosen. 2 λ Boom Length, but the output data may not be accurate. Feedback; The site map; Design. 3. cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters . 5 dBd (dB over dipole) gain. The formulae to calculate the dipole antenna and leg length are: L = 468 / f. 1mtr 50Mhz Quad; 3el 2. 5 inches 18 inches to Dir 1 from driven 18 inches to Dir 2 from Dir 1 This gives a 51 inch boom, total. Moore, W9LZX, a Christian missionary and engineer at HCJB (a shortwave missionary radio station high in the Andean WX9DX-KC9DTW 2 METER QUAD(Pdf file download) WX9DX 2 METER COLLINEAR (Pdf file download) 2 METER/70CM AND ASSORTED PROJECTS (High Gain Vertical Antenna with Calculator) 6 Meter Antennas Mixed types New! HYBRID 6 METER YAGI 4 Elements With Quad Reflector KG4FET (Junk pile scrap turns to gold!) New! However, if you need only a 10-meter model (and later want to tuck 6-meter or 2-meter quads within the same framework), then you can build one yourself with simple tools and materials. I used the dimensions from an on-line quad calculator to provide the exact length wire needed for the reflector and the driven element. I built it over 15 years ago using one 10ft length of 1" SCH40 PVC and one T connector. in INCHES/ CENTIMETERS: Total Length: ONE SIDE: Spreader Arm Length ONE SIDE "C" Reflector: The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a tuning 2 element Cubical Quad. The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a tuning condition that will give maximum Calculate the size and spacing of a cubical quad antenna for amateur radio use at any frequency. This basic calculator is designed to give the aproximate length (height) of a particular vertical antenna, for the Online quad antenna calculator. 3 (doubles a dipole gain) 25 ohm fed rectangular shape quad antenna dbi gain 4. The Moxon rectangle is a popular 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 50 ohm match. For instance, if one wants to design a Cubical Quad Antenna for a frequency of 100 MHz, the calculator would use the formula to determine the wavelength as 3 meters. The result was my own version of a shrunken diamond-form 2-element quad for 10 meters with dimensions less than 7' per side. 6 dBd or a Boom Length > 39 λ will limit the design to 21. What is a Delta Loop Antenna? At the bottom of the page is the wide-bandwidth version of the antenna. The half-square (see Figure 1) offers a vertically polarized pattern with The K4MMG 2 METER QUAD CONSTRUCTION TIPS FOR BUILDING BETTER QUADS (Graphic intensive -- allow time to load) The antenna that is below the quad is a 6 meter moxon that is made from TV tray legs! Ham Ingenuity at it's Here’s some thoughts on a “hardware-store special” 2-meter quad, and a modified quad for 2 or 10 meters. The goal of the antenna is to cover the entire 2-meter band from 144 to 148 MHz, and it does just that, as you can see from the image below. We got onto the discussion of antennas and he said I should build a quad antenna to improve my reception. 3mtr 50Mhz Quad; 4el 2. Hits: 29563 | Votes: 26 | Rating: 6. It is an indoor antenna or antenna for restricted space. The tube is insulated from the quad by two small plastic insulators. The SWR there is right at 1. It describes how to check the antenna with a field-strength meter, or by using a separate receiver in conjunction with a dipole antenna. For the dimensions I took the 1/4 wave ground plane antenna dbi gain 1. (It does not calculate inductance, impedance, or even "Q" factor A 2-element cubical quad could be suitable regarding performances and sizes, but mechanically it’s rather complicated and fragile. 32 Helix antenna calculator, to design and make helix antenna plans. 15 (yagi driven element) 1 wavelength cubical quad antenna dbi gain 3. Default is 29mHz. At a later date, after Moore had returned to the United States, he applied for a patent covering the new antenna. The design from QST was altered to eliminate instability in matching to a 50 Well Clarence and his new antenna toy, the Cubical Quad, was stealing all of the dx from Lew McCoy and his dx buddies, even though they were using 4 element Yagi's while Clarence was only using a 2 element Quad. T he purpose of the calculator is to give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. Consider a 2 Element Yagi this Antenna season. However, the vertical space requirement and the consequential support structure is very significant. I built a dual band 2meter/70cm 6 years ago, but lost it in a storm last year. 6 dBd Gain and Boom Length to 39 λ. All Fiberglass Construction; Boom Length – 16″ Matched cables used for co-phasing antenna pair; Ring terminals installed for antenna feed points; Terminated I have a home made 2 meter 4 element Quad Beam antenna in a bedroom I use for my computer/ham radio/hobbies etc. The link to this resource has been on our site since Wednesday Feb 26 2025, and it has been followed 89 times. The antenna acts like a stacked pair on the vertical and a standard yagi on horizontal. We offer a huge selection of Yagi antennas, including cross-polarized and circularly polarized, from top brands like M2 Antennas, Cushcraft, MFJ, and Diamond Antenna. The possibilities are limitless. Antennas/Antenna Calculators; The title of the main category is Antenna Calculators and it deals mainly with Antenna design calculators. Main. These I mounted on a wooden boom using a quad antenna spacing formula I was familiar with: Spacing: Reflector to driven element 14. This is because the Yagi's all have pointed sharp element ends, these protruding elements create a large voltage differential between the ends Quad calculator Cubical quad antenna calculator in java script let you calculate elements size and spacing in inch and meters. 5/Frequency ( Mhz ) Driven Element ( L )= 74. About Us; Contact; X. 5mtr 70Mhz Quad; DualBand 50/70Mhz 4el; 6el 5mtr 70Mhz Quad; will Build a Stronger 2 Element Quad A Different way to construct a tried and true antenna out of PVC, especially for the 10 meter and higher frequencies. built a second Quad antenna, this one to be used in the 20 meter band at his ham station, HC1JB, in Quito. If we are building a 2 element quad we would need to use a 2:1 ratio balun because the feedpoint of impedance of the 2 element quad is around 100 Ohms. How to tune it? Move the aluminium tube left or right. So far it received 2 votes for a total score of 10. l c is the speed of light (3×1083×108 meters per second); f is the frequency of the radio wave in Hertz utf-8 plaintext format; Example. October 4, 2015 9M2PJU The purpose of the calculator is to give you the needed sizing to construct a good multi-element quad antenna for amateur radio use. Specifying a Gain > 21. We use cookie to improve your experience on our site. This calculation assumes that the speed of light is approximately 300 million meters per second. There are two basic types in the USA: RG-59 usually has a solid polyethylene 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; To calculate dimension you can refer to this Quad Antenna Calculator. 7-August-2022. "Cubical Quads are quieter then Yagi's". 174, and 144. 8. Listed under the Antennas/Antenna Calculators category that is about Antenna design calculators. 4616. Elements: Element - Total Length: Wire - One Side: Spreader - Half Length: Spreader - Total Length: Element - Spacing : How to make the Super antenna. Man that thing worked like a charm. Whether you’re operating on 2 meters or you work in the 1. If the wire you use is #14 bare copper (stranded or solid The antenna is basically a quad opened up on the bottom. Custom Google Search . The antenna's key advantage is its ability to maintain most of its design-frequency performance across a wide bandwidth, such as all of 10 meters or all of 2 meters. The pattern of left is for a two-element 20-meter quad 35 feet high (1/2 wave high). Patch antenna 3G, 4G, Wi-Fi; Horn antenna; Omnidirectional antennas HamAlyzer 2. For foam-dielectric cable, it's usually 0. By Jim Wilson. Even though the deepest null occurs only in the vicinity of the design frequency, the front-to-rear ratio–accounting for the full rear quadrant–is very good The KB3TTP 10 Meter Quad - Build a Stronger 2 Element Quad Antenna Quad Antenna Calculator You can use ¼ λ of RG-11 as a matching transformer and put the Quad in the square, it will only be 9'h x 9'w x 6' boom, IF you can get fiberglass, PVC or a five element quad antenna for 144 mhz diy project this 2 meter 5 element quad antenna was modeled using eznec with a boom from a uhf tv antenna and cpvc pipe for spreaders constructed for 146mhz it exhibits a gain of 10 7db and an impedance of 75 ohms real world results surpass the ht antenna reaching over 20 repeaters up to 75 miles away the design costing around 10 The ARRL Antenna Book states that the diamond design is a superior mechanical design because the sloping element wires will shed water, thus reducing potential ice loading. 114. Enter the center frequency and get the dimensions in inches and centimeters for each element Cubical Quad Antenna JavaScript Calculator for CB and Amateur Radio Communications The Formulas for calculating quad element lengths (in centimeters) are as follows: Reflector Element ( L) = 78. 42-46 This Log-Periodic Dipole Array (beam) antenna covers 130-170 MHz for those who also like monitoring. Rhombic Antennas 30M - 6M Building A 2-meter J-Pole Antenna By Jaden Cheap Yagi Antennas for VHF/UHF -- From Kent WA5VJB The Simplest Collinear-- From Ross W1HBQ The desgribed Gamma-match is used for 11 meter Yagi’s with an aluminim element thickness around 25mm !!!!! I am however convident that with slight adjustments it will work for other diameters. If we are building a 2 element quad we would need to This is no longer mentioned about the Cubical Quad in the ARRL, but deserves mentioning. 5 - 2. This two-element Cubical Quad antenna is designed for use on either the 10-meter ham band or the 11-meter Citizen's Band. As you can see, this antenna actually is a Full (1) wavelength antenna as compared to the 1/2 Wavelength driven element of the Yagi. n6nb. Beginners Guide to Ham Radio; 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; 2 METERS After many years of using a modified Lightning Bolt quad for 20-15-10 meters, I upgraded to a Cubex 5-bander. Gone are the days of performing the same calculations over and over again! 2 meter ZL Special Antenna. I was scanning the 2-meter band one night and heard a fellow amateur, his signal was weak but I gave him a call. Your result will consist of: If the frequency is 3. That is, to put the L is the side length of the delta loop antenna (meters) f is the operating frequency (MHz) To calculate the side length of a delta loop antenna, divide 300 by the product of the operating frequency and the square root of 3. The Quagi Antenna Turns 40. 2 GHz band, DX Engineering has a VHF/UHF beam antenna that can deliver the clean, clear signal you demand. 3mtr 50MHz Quad; 3el 4mtr 28Mhz Quad; 4el 3mtr 50Mhz Quad; 4/4el 50/70MHz Quad; 5el 4. I love quad antennas. The two element quad has a very good reputation. The loop is usually made from a 36 foot piece of copper wire. 46 dBi gain, which is about 3 to 3. The diagram below contains all the information you would need to build a 2-Element 15 Meter antenna. It is about 1 CUBICAL QUAD ANTENNA CALCULATOR. 66. It’s interesting to note Quad Antenna for 2 Meters. Quarter-wave matching section length in meters = 75 * cable's velocity factor / frequency in MHz The velocity factor for polyethylene coax is usually 0. 3 (Newington, ARRL, 1992), p. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with. The document has moved here. Figure 5 shows the SWR readings I obtained throughout the 2-meter band. [2]In 1951 Clarence C. While you may not have the space for a large array, there is a lot to be gained from simple, 2 and 3 Element arrays. 6dB colinear VHF antenna Building details of a VHF colinear antenna with 6 db gain 5/8 Collinear antenna A 5/8 wave stacked j-pole antenna plan The quad loop measures exactly 1/4 of a wavelength on each side. This tool will help you dynamically to calculate the spacing between the reflector, driven element and directors. [1]In 1938, George Brown et al. Feeding a Quad; Antenna Switching; Towers & Rotators; 3-Element Design; Testimonials. If you need a vertically polarized bi-directional 2-meter antenna with deep side nulls for direction finding or nulling out adjacent channel interference, try the half-square. The calculator yields a reasonable approximation of dimensions, to within 5% over the amateur bands, using typical wire gauges ranging from #12-18 AWG. The antenna is an ARRL Handbook design. . For the dimensions I took the outside diamter of 1/4 wave ground plane antenna dbi gain 1. Antenna covers all bands 80-10 meters + 30, 17, 12 meter WARC Bands This antenna works as a Full Wave Loop on 80 Meters and also works as a 2 wavelength open loop or Bi-Square on the 40 Meter band Loop Antennas and Calculator T he first VHF antenna I ever built was this 2-meter quad. Log Periodic Antenna Design 10 Meter 4 Element Quad Antenna; 144 Mhz Magnetic Loop Antenna; A “loopy” Loop Loaded Vertical; To calculate dimension you can refer to this Quad Antenna Calculator. Code to add this calci to your website . Moore (patent no. 35 dB. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Inches/Cm: Total Length: One side: Spreader length One side "C" Reflector: Driven lement : The gain of an an antenna with parasitic elements varies with the spacing and tuning of the elements, and thus for any given spacing there is a tuning condition that will give maximum Cubical Quad Antenna JavaScript Calculator for CB and Amateur Radio Communications JavaScript PROGRAM by N6ACH Ron vanVarden Enter the center frequency: mHz online antenna calculator for cubical quad antennas by ea1ddo hk1h. If you are limited in space a 2 elements quad could be what you were looking for. , February, 1973. The well-known Mr Baumgartner, HB9CV, has implemented a 2-element tubing antenna that has the both elements fed with such a phasing that it gives it better performances than a 2-element Yagi. I measured these very precisely but left about 6 inches of extra wire on each end Full-Size 40-Meter Quad A full-size 2-element quad for 40 meters has the width of a half-size 40- meter Yagi--about the same width as a full-size 20-meter beam. Why? Unfortunately Yagi Antennas especially ones high on towers are susceptible to precipitation static. 2,537,191), W9LZX, (SK), an engineer at HCJB, (a shortwave missionary radio station in the Andean Mountains). To build this antenna you need a lot that is at least 100 feet across. Patterns are shown across the 2-meter band for a model designed for 146 MHz. It's very important to know the correct distance to have a good antenna stack array system with good performance. 2 Figure A shows the azimuth pattern of a 2-meter Moxon when the antenna is vertically oriented and, hence, vertically polarized. Probably the Well, now there’s a solution that will save you time and energy: the Antenna Dimensions Calculator by Omar Essilfie-Quaye. This page has a variety of calculators that can be used to calculate dimensions for practical antennas for 6, 10, 11, 12, 15, 17 and 20 Meter Yagi Antennas. 150. With pvc pip and electrical boxes as the hubs. Unidirectional antennas. Listed under the Antennas/Quad category that is about Quad antennas resources. In the real world, installed at practical amateur heights (physically close to ground), the range of feedpoint impedance can be from 50-240 Ω depending on configuration, orientation, and choice of feedpoint. 2 Elements HB9CV 2 meters band HB9CV antenna Swiss Quad for 10 and 6 meters Based on HB9CV, F6ITV decribes how build a swiss quand antenna for 28 and 50 Mhz. BUTTERFLY. "12-Meter Quad" in The ARRL Antenna Compendium, Vol. Kris Merschrod, KA2OIG/TI2, "Coil Shortened Quads - A Half-Size Example on 40 Meters" in The ARRL Antenna Compendium, Vol. We take issue with that premise, in fact we think it can be shown that the square is stronger and no more susceptible to ice loading than the diamond configuration and more The Magic Wand Antenna A Novel 2 Meter Full Wave Quad Loop By WB5ISM JERRY RANDALL (SK March 12, 2011 - See update below) DON'T LAUGH about this antenna! Ripley says "Believe it or Not"! The idea for this 2 meter full wave loop antenna came from QST. By KB3TTP (Updated Feb, 2012 - see bottom of article) Editors note: Quad antennas are notorious for being difficult to keep in the air. QRZ Shareware Collection antennas-- over 40 antenna files Quad Antenna Calculator -- From KD6DKS Quads By EI7BA Quad Antennas--- From The ARRL Quad - Multiband - By EI7BA. The antenna can be connected by other means, of course, including parallel-conductor lines, which In order to use our antenna calculator, you'll need to know the frequency on which you want your antenna to operate. Cubical Quad Calculators, except Rear This article has been edited from the original QST article with added information that may be helpful to some builders desiring to build the antenna for 2 meters. 7 megahertz, the antenna length is 38. The prototype for 2 meters made its first contact of over 200 miles while lying upside down on a picnic table. Shop now. Field Results After connecting the quad to my radio, I rechecked the SWR. There are usually four radials, three being a minimum, but you could A 146 Mhz J-Pole Antenna A 2 meter (146 Mhz) J-Pole antenna that is inexpensive, and easy to build. 200, 144. I measured these very precisely but left about 6 inches of extra wire on each end Reply to a comment by : G4AON on 2013-08-05 I love quad antennas, I have a couple of home made ones for 6m portable work The gamma match on the 2m quad can be avoided by careful work in EzNEC, if the dimensions can be Moxon rectangle notes and online calculator. It has been 40 years since the VHF-UHF Quagi antenna--a combination of the desirable features of a Yagi and a cubical quad--was developed and the design was first published in the newsletter of the Southern California VHF Club, a forerunner of today's Western States Weak Signal Society. 2,537,191), 3el 2. Compact 2-Element - 6+dBi. The 2-Element-HB9CV-Beam The HB9CV-Beam is a 2-Element-Yagi with two driven elements and was introduced by Rudolf Baumgartner, HB9CV in the 1950ies. 4 (cubical quad driven element) 50 ohm fed rectangular shape quad antenna dbi gain Cubical Quad Antenna JavaScript Calculator for CB and Amateur Radio Communications JavaScript PROGRAM by N6ACH Ron vanVarden. Following the ideas presented here by KB3TTP will enable WX9DX-KC9DTW 2 METER QUAD(Pdf file download) WX9DX 2 METER COLLINEAR (Pdf file download) 2 METER/70CM AND ASSORTED PROJECTS (High Gain Vertical Antenna with Calculator) 6 Meter Antennas Mixed types New! HYBRID 6 METER YAGI 4 Elements With Quad Reflector KG4FET (Junk pile scrap turns to gold!) New! Build a Stronger 2 Element Quad A Different way to construct a tried and true antenna out of PVC, especially for the 10 meter and higher frequencies. such as Bi-Quad, Dipole, Folded Dipole, Helical, Turnstile, and Yagi-Uda. This quad has #12 AWG copper elements. 8 Cubical Quad Antenna JavaScript Calculator for CB and Amateur Radio Communications JavaScript PROGRAM by N6ACH Ron vanVarden. If we are building a 2 element quad we would need to use a 2:1 ratio balun because the feedpoint of Full-Wave Loop Antenna Length Calculator. Notes on The Cubical Quad Antenna Calculator for citizens' band (CB) radio and Amateur Radio Communications to calculate the spacing between the reflector and driven elements and directors. Editor's note: Many years ago, the 10 meter version of this 2 element Yagi was built by myself using much the same construction techniques as mentioned in the article using small aluminum tubing. Hits: 7885 | Use the following entry areas to define your antenna requirements. 4 Ghz double quad antenna; Plan of a helix antenna for 2 meter satellite use by VK5ZAI. I’d heard good things about the Cubex models from other hams and Norman at Cubex was tremendous at answering my This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. We owe it's development to Clarence C. Change this to whatever frequency you like. 2 Meter 3 Element Quad Direct coax feed! The Quad antenna, sometimes called the Cubical Quad, is an antenna which is used by many amateur radio operators. Enter the center frequency: mHz . An LPDA for 2 Meters Plus (839,246 bytes, PDF file) QST October 2001, pp. Radio waves behave very similar to the photons in light waves. By using our site you consent cookies. 2 minutes. The page will operate below the lower limits, 11. A Five-Element, 2-Meter Yagi for $20 (457,324 bytes, PDF file) QST July 1999, pp. He came back to me and we had a very interesting conversation. the fact that the Quad-type antenna radiated perpendicular to the plane of the loop was deemed by the Patent The Delta Loop Antenna Calculator is a valuable tool used in designing and constructing delta loop antennas. 5 dB over the 16 foot boom length. By Wayne Overbeck, N6NB www. Enter center frequency to be calculated for the quad: mHz. 34-37 Get about 10dB from a modified Radio Shack FM broadcast receiving antenna. A General Coverage frequency (21. It was installed on a short mast about 15 to 17 feet Built a 4 element quad for 11 meters in the late 70's. 2 Meter Mono-Band Series. 2 Meter. 00/10 Last updated: 2025-02-28 The quad antenna is a development of several inventions. Antennas VHF-UHF. 8 dBd of gain and and 2. A quad has a smaller turning radius that a yagi it has a lower noise level and a slight higher gain. I later switched to the quagi antenna. The feedpoint impedance of a full-wave loop in free space is aproximately 100-120 Ω with a gain over a dipole of 1. 5/Frequency ( Mhz ) Director Elements ( L )= 70. 3-el Quad antenna online calculator for 50 and 75 ohm feeder. last updated 26 March 2023. Following the ideas presented here by KB3TTP will enable Moved Permanently. 1/2 wave dipole antenna dbi gain 2. Menu. The quad calculator is a very useful tool which not only calculates element dimensions but also works out the ultimate element A simple 2-element quad for 2m. 6. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. 9 dB increase of forward gain but if it done 2 Meter 3 Element Quad Direct coax feed! The Quad antenna, sometimes called the Cubical Quad, is an antenna which is used by many amateur radio operators. 2 MHz) is selected as this provides the best coverage of the 15 Meter band. The 2. You can convert these to other frequencies simply by scaleing all dimensions according to wavelength. This calculator requires only the entry of the center of the frequency range your quad antenna will be used at. This up and over, over and down design had been used in HF wire antennas. For more information on quad antenna dimensions you can use this Quad Antenna Calculator. The results are conveniently displayed in inches, centimeters, feet and meters. So my target is 144. The Quad loop alone has 2 db of gain over the dipole antenna. Bob Haviland, W4MB, The Quad Antenna; John Koszeghy, K2OB, High Performance Since our antenna (the 4 element quad) has a feedpoint impedance around 50 Ohms and our coax is 50 Ohms, that means we want a 1:1 ratio. The gain is about 7 dBi on the design frequency, although the front-to-back ratio remains above 20 dB. 277 meters. Matching the antenna requires 1/4 or 3/4 wavelength of 75 ohm coax cable. 4 (cubical quad driven element) 50 ohm fed rectangular shape quad antenna dbi gain 4. Thus if we were Magnetic Loop Calculator; MeterMate; UDY 2 Voice Keyer; Ham Radio . The wavelength calculators used to calculate the antenna element dimensions will therefore use the speed of light (299792458 meters per second) in a vacuum as constant. com. 73, Keith WB2VUO. The Quad Beam Structure. patented a loop antenna with rhombic shape and quarterwave sides. This 3 element 2 meter Yagi is nothing more than an "adjustable match" half-wave dipole antenna (the driven element) using direct feed 50 ohm coax, mounted between the other two PD9JS - RF Antenna calculators for various antenna types Back to Telecommunication. In 1924, Moses Jacobson patented a loop antenna with rhombic shape. cemmeo eyghziei pfhdd fnlpw ycypo lurl akbc gpeuq rmseaov paixyb tyy dkoipb onolp vkpv fjvmw