Dodgy plans to make archimedean spiral antenna for rtlsdr software defined radio receiver resources utilized antenna. Youloop portable passive hfvhf loop antenna now available. Squares are easier to make and have less solder joints. The idea behind the double loop is that two properly polarised magnetic fields enhance each other and because the two loops are in parallel, the impedance at the tuning point will be lower and the bandwidth larger compared to a single loop. Magnetic loop antenna calculator small transmitting loop antennas, commonly called magnetic loops or mag loops, can give surprisingly good performance when they are carefully designed and constructed. Nec modeling software does not accurately model this antenna. M agnetic loop antennas are so named because most of the energy in the near field is contained in the magnetic component and very little in the electric component. Homemade magnetic loop antenna for 27 mhz else known as small transmitting loop or stl, this isnt a traditional electric antenna, because the near field is almost magnetic. There are many ways to get the radio connected and matched to a magnetic loop antenna. Its a light magnetic loop antenna calculator that run on ms windows, and allow to calculate capacitor values and voltage based on loop circumference, conductor diameter, desired resonant frequency and the operating power. The following is an article which i wrote and was published in the february 20 edition of the central coast arc.
Magnetic loop antenna calculator resource detail the. At 12 feet above the ground, the coupling loop needed to be resized to 1. Softwareantenna analysis software,antenna analysis software, for ham radio. For a small loop, this increase in length improves the input resistance. Like any antenna indoors, you have to use your imagination. Rf antenna design software and utilities educypedia. I have been experimenting with small generally less then 110 wavelength circumference transmitting loop antennas in the hf bands since the 1980s. Magnetic loop river city amateur radio communications society. When disassembled the antenna easily fits in a suitcase or backpack. Choose the units of measurement, english or metric. Magnetic loop antennas for the radio operator with limited space pt. The better the antenna, the narrower the bandwidth. The g4ilo wonder loop is an inexpensive, easy to make magnetic loop antenna that covers five hf bands, 40m through 15m. Erics build is designed to operate at 100w on the 20 meter band, and.
Based on the product description, the k180wla sounds a lot like a typical magnetic loop antenna and resembles the popular mla30, but what makes it unique is the fact that it can be recharged via a micro usb port. The main category is antenna analysis software that is about software, antenna analysis software, for ham radio operators and hams. A magnetic loop antenna may be the answer and they are not as difficult to build as you might think. Obtain the vector frequency response of arbitrary 3d antenna structures. It is designed in its structure so that it manages with the existing software on the pc. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. This antenna software module also helps you validate existing antenna designs and study a plethora of antenna design issues, including. Loop systems mlat pro top band qrp magnetic loop antenna, the mlat is a magnetic portable antenna for 160m, 80m and 40m.
Obtain the radiation pattern of any antenna over a frequency range. The 40m loop antenna ed, vk2ji this antenna is also known under the names sky loop and dxbuster and is very similar to a horizontal delta loop. In contrast to the mla m here is a stepper motor in the housing for tuning. The reason for this interest was that my son 2e0kgg had moved to a new qth and to help get him active on one or more of the hf bands we needed an antenna design that was suitable for use indoors or on a balcony. Small transmitting loop antennas, commonly called magnetic loops or mag loops, can give surprisingly good performance when they are carefully designed. Singleturn transmitting loop antennas of various regular. This very easy to do with the controller software i wrote see further below. The image below shows the information on my loop above, at 14mhz with 50w rf. Mlav is a magnetic loop antenna for five six shortwave ham bands, 3. There are a lot of misconceptions about small loop antennas. This calculator enables you to test the design of an octagonal loop antenna and to answer what if questions until you arrive at a design that meets your needs without a lot of experience in electronics. Magnetic loop antennas for qrp amateur radio hackaday. The ultimate solution for hams with antenna restrictions.
To be a magnetic loop, the loop circumfrence must be less than 0. According to the loop calculator programs, i should have been able to tune up to 10. If you dont know what a youloop is, it is a simple passive magnetic loop antenna design which consists of a ring of coax cable and a low loss 1. Magnetic loop river city amateur radio communications. Enter the length of the antenna conductor, which is the distance around the loop. Magnetic loop antenna for 8020 mtrs by frank n4spp.
Magnetic loop antennas resonant loop antennas radioworld uk. Modeling the unmodelable, cebik, lb, w4rnl, antennex, july 2006. Design your own tuning capacitor for use with this antenna with the capacitance calculator capacitor design to use the calculator. Works either in standard and metric units, and let you choose on material, and loop. The software package does not need to be installed. There are many designs and information available on the net concerning magnetic loop antennas even though these antennas are a fraction of the size of a full size resonant antenna, size of the lower frequency loop can still be quite large for a limited sized property.
A magnetic loop antenna for shortwave listening swl kr1st. This is the handy tool that helped me decide what size loop to build in each case. The feedpoint is just in the middle of the bottom horizontal wire. Mininec should not be confused with nec, which is a large antenna analysis program written in fortran and designed to run on mainframe computers. Antenna design freeware 1d and 2d arrays from mei software. Magnetic loop ideal for restricted space locations,you can remotely tune to the ham bands in seconds reduces harmonic interference and provides super frontend receiver selectivity. The most common material for home building small ham radio loop antennas is common copper plumbing pipe. Jul 24, 2015 magnetic loop antennas for the radio operator with limited space pt. Tutorial 9 design a ring or loop antenna using cst youtube. Youloop portable passive magnetic loop antenna for hf and vhf if you dont know what a youloop is, it is a simple passive magnetic loop antenna design which consists of a ring of coax cable and a low loss 1. Mar 17, 2019 the magnetic loop design leads to antenna which is tuned to a very narrow frequency range, giving good selectivity.
Antenna programs antenna design software, antenna system analysis v1. The calculators give you theoretical values, your actual construction will also affect the antenna greatly. Listed under the antennas magnetic loop category that is about magnetic loop antennas. The yahoo magnetic loop antenna group is a discussion forum for design and construction of magnetic loop antennas. For those with no trees, little room, maybe a patch of grass, or a deck or a sliding glass door where you can erect an antenna and only temporarily, for the bands above 7 mhz, id suggest an antenna commonly called a magnetic loop. Its easy to build with a soldering iron, a plastic case and a little knowledge of arduino. Koch loop the starting pattern for the koch loop that is used as a fractal antenna is a triangle.
Our regular antennas work by recieving the electric field portion of the radio wave. Youloop portable passive magnetic loop antenna for hf and vhf. For instance, according to ki6gd loop modeling software, it only takes a extra foot and half of circumference or an extra half inch of diameter of pipe to gain back the lost efficiency. After consulting many of the available internet sources, and by combining ideas, i was able to assemble an antenna that performed well. Youloop portable passive hfvhf loop antenna now available in. Jun 21, 2016 design the shape of loop or ring antenna using cst microwave studio software.
By raising the input resistance, thye antenna can be more easily matched to a feednig transmission line. Its a light magnetic loop antenna calculator that run on ms windows, and allow to calculate capacitor values and. This controller doesnt have endstop limit capabilities. The magnetic loop design leads to antenna which is tuned to a very narrow frequency range, giving good selectivity. The correlation of the measured parameters with those predicted by the 4nec2 method of moments calculations validate the magnetic loop antenna models. However, since the small loops radiation resistance is very small compared to that of a full sized resonant. Hf antennas signaloop model hf319 portable hf magnetic. Amateur radio antenna sold here,we update our stocks to keep in touch with modern improvements in magnetic loop antenna design.
Id spent some time reading various articles describing the construction of magnetic loop antennas. This applies to all loops with perimeters less than 12wavelength, including those with a tuning. Wikipedia, the last word on antenna design zsmall loops have a. The best luck with rectangles has been with no more than a 2. A magnetic loop is essentially a small loop antenna whose circumference is less than 110 of the wavelength. You can use the alexloop walkham antenna supported on windows, balconies or even inside your radio shack. Like getting on the air for the first time or taking your license exam there is a certain amount of uncertainty when you first approach magnetic loop antennas, there are a few new ideas to grasp. The mlav v as veranda or a patio is a new antenna of the series of magnetic loop antennas from the workshop of ok2er. Magnetic loop design software this is the handy tool that helped me decide what size loop to build in each case. In part one of this series, i covered the use of one brand of commercially available, small transmitting loop antennas, also known as magnetic loops. A magnetic loop antenna for hf iw5edi simone hamradio. For that article, i bought the very popular alexloop walkham antenna. M mana is an antenna analyzing tool based on the moment method introduced in mininec mini numerical electromagnetics code version 3.
Due to the high voltages and strong radiation field this antenna may produce, take care to avoid close proximity to this antenna while transmitting significant power levels. The smallest antenna described for 80 metres was a magnetic loop. I designed receiving loop antennas with a bandpass characteristic to cover the whole 6khz band without the need for remote tuning. Making a receive loop antenna the radioreference wiki. A small current is transduced on the antenna and the reciever amplifies it and converts it to audio. Using the software at the bottom of this page, i worked out that a 36cm length of wire, will need a capacitance of around 3. So, the loop diameter should not exceed about 1 mtr. Software beta testing was provided by a group of fellow amateurs. Many thanks to swling post contributor, crvee8, who shares a link to the k180wla, a new active mag loop antenna. Mar 20, 2020 youloop portable passive magnetic loop antenna for hf and vhf. Amongst all the army, delta, gamma, toroid and whatsoever feeds the simple inductive loop is widely used. It is also the lowest cost high quality complete small magnetic loop antenna currently available, but quality is not compromised. I would like to build a loop antenna for 10 meter but i dont know how to calculate the measurements for it john, hope you could help me.
Loop antenna calculators suggest that a loop of that size can be tune from 40 to 10 mtrs with a variable capacitor of 10180 pf. The reason for this interest was that my son 2e0kgg had moved to a new qth and to help get him active on one or more of the hf bands we needed an antenna design that was suitable for use indoors or. So hacker of note and dedicated amateur radio operator jeri ellsworth ai6tk has started a video series devoted to building a magnetic loop antenna for the 160. The unique low profile design offers a solution for antenna restricted hams and short wave listeners. The radiation pattern of a small transmitting loop antenna is shown below. About magnetic loop designer the resource is currently listed in in a single category. Pictures of the circuit diagram are included in the software. That is why motor driven tuning capacitors are necessary. This link is listed in our web site directory since tuesday aug 21 2001, and till today magnetic loop designer has been followed for a total of 14076 times. This is where the term magnetic loop antenna originates. A magnetic loop antenna for shortwave listening swl now that were on the downward slope of sunspot cycle 23 2004 you may have noticed that some of your favorite broadcast stations dont come in as strong as they did a few years ago.
Small loop antennas are often referred to as magnetic antennas. However, it also requires retuning quite often in order to stay onband. Many sites state that a feed loop with a diameter of about 15 of the main loop will give the desired 50 ohms match for the bands you want to cover. Magnetic loop antennas for the radio operator with limited. Bingfu magnetic base hd radio fm antenna and am loop antenna for denon pioneer onkyo yamaha marantz indoor digital hd radio fm bluetooth stereo receiver av audio vedio home theater receiver amplifier. Magnetic loop antenna id spent some time reading various articles describing the construction of magnetic loop antennas. A well built magnetic loop antenna may only have a usable bandwidth of a few khz. Design the shape of loop or ring antenna using cst microwave studio software. Wont beat a circular loop for sure, but you have to do what you have to do.
Window mounted alexloop walkham magnetic loop antenna. Magnet loop antenna calculator antennas i1wqrlinkradio. Bingfu magnetic base hd radio fm antenna and am loop antenna for denon pioneer onkyo yamaha marantz indoor digital hd radio fm bluetooth stereo receiver av audio vedio home theater receiver amplifier 3. The small transmitting loop antenna aka magnetic loop. For a general introduction to small transmitting loop antennas stl, a.
The magnetic loop design leads to antenna which is tuned to a very. Introduction of the many different antenna projects i have built for hf, the most interesting and rewarding project was the small transmitting loop. After consulting many of the available internet sources, and by combining ideas, i was able to assemble an antenna that performed well, even under poor band conditions. Many experimental designs were tested and not all of them were successful. The magnetic loop couples to the to the magnetic field of the radio wave in the region near the antenna, in contrast to a monopole or a dipole which couple to the electric field of the wave.
Lz1aqs sdr radio and wideband active small magnetic loop antenna projects. Since its introduction in mid 2015, the hf319 has become a popular antenna and is used in a variety of situations. It is designed for portability, and can be assembled or disassembled in about a minute. This project is for those ham amateurs who dont have a commercial one. Magnetic loop antenna for 8020 meters, doerenberg, f, n4spp. Build a magnetic loop antenna controlled by arduino. G4fms design, tuning the i1arz loop, appeared in radio communication, august, 1989. Magnetic loop antenna calculator resource detail the dxzone. Portable magnetic loop antennas ham radios best kept secret eric norris wd6dbm v2.
This article provides all the details needed to build your own. Very weak signal reception with small magnetic loop antenna last rev. This link is listed in our web site directory since monday may 14 2012, and till today magnetic loop software has been followed for a total of 986 times. Wikipedia, the last word on antenna design zsmall loops have a poor efficiency and are mainly used as receiving antennas at. This software should not be used for loops having a larger circumference than 110 lambda. About magnetic loop software the resource is currently listed in in 2 categories. Radio waves travel by a wave of electric and magnetic fields at 90 degrees to each other. This interesting feature makes the ground plane losses very low and generally this antenna has little dimensions. Home made high power magnetic loop antennas amrron.
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