Small transmitting loop antennas, commonly called magnetic loops or mag loops, can give surprisingly good performance when they are carefully designed and constructed. Although this online calculator is intended to assist with designing and building homemade, ham radio loop antennas for use in the HF bands, magnetic antennas have been constructed that function in the VHF or even the UHF frequencies. The most common material for home building small ham radio loop antennas is common copper. Magnetic Loop Calculator v.1.6 by KI6GD. It's 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. Works either in Standard and Metric units, and let you choose on material, and loop. Magnetic Loop Rechner Das Magnet Loopantennen Rechner-Programm dient zur Berechnung von Magnet-Loop-Antennen und der HF-Einspeisung zu dieser Antenne bis in den UKW-Bereich, bei einem Umfang der Loop von <0,1 λ bis etwa 0,4 λ. Installation Das Programmpaket braucht nicht installiert zu werden. Es ist in seinem Aufbau so gestaltet, dass es mit der auf dem PC vorhandenen Software auskommt. Die ZIP-Datei wird in einen neuen Ordner kopiert und dort entpackt. Sollte das Programm trotzdem bei. The distance between gamma tube and loop tube = Circumference of the loop / 70. (real distance) (real distance) This dimensions works fine, even for 80 m and in almost any situation DG0KW Magnetic Loop Rechner - Resonanz Interessant sind die Ausführungen zum Thema induktive Ankopplung. Der Einfluss der Ankopplung ist ggf. ausschlaggebend für den erfolgreichen Nachbau. Das Programm geht darauf besonders ein
Gerade beim Betrieb in Räumen haben magnetische Antennen einen besonderen Vorteil: Das Magnetfeld durchdringt Wände leichter als das elektrostatische Feld, das die üblichen Dipole im Nahfeld produzieren. Gegen Stahlbeton hilft natürlich auch eine magnetische Antenne nur wenig. Mehrere Wellenlängen von der Antenne entfernt kann man die Felder von magnetischen Antennen und Dipolen nicht mehr unterscheiden. Aber bis dahin ist man höffentlich aus dem Mauern raus.. Um die Größe der Ankoppelschleife usw zu berechnen habe ich den Mag Loop Rechner von DL0HST verwendet. Der Aufbau war in ca 1h erledigt und ich habe gleich den KX3 angeschlossen um die ersten Tests zu machen. Die Loop lässt sich von 10-40m anpassen. Wobei auf 30-40m sicherlich keine Wunder mehr erwartet werden können. Ich habe auf 20m aber schon einige Stationen mit 10W in CW arbeiten. Plot of measured Magnetic Loop Antenna Feed Point Impedance vs. Frequency. Comparison of feed point impedances at 5 through 11 primary turns on the FT114-43 ferrite core. VSWR < 1.2:1 from 42 to 60 ohms impedance. The measurements on 14-28 MHz were taken with only the air variable tuning capacitor on the loop antenna. The curves are skewed on 7 and 10 MHz due to the attachment of the lossy 150.
.5m 2 . Now, although the overall width of the fractal loop is about 87cm, its design means that it covers roughly the same area as a circle of approximate radius 0.3m, giving a total enclosed area of about 0.28m 2 Loop-Durchmesser: 0,66 m Für den Strahler: D = 20 mm (das Rechblatt bezieht sich allerdings auf runde Querschnitte, hier wird ein 25 x 2 mm Alu-Flach-Material verwendet) Im Diagramm werden die erwarteten Werte der Loop, zwischen dem Min.-/Max.
A Small Transmitting Loop is one where the perimeter is less than about 0.1λ. The calculator will work for perimeter up to 0.3λ but radiation resistance estimates are poor above 0.1λ. * loop perimeter >0.1λ. The loop conductor must be a round conductor 3rd ang sheet 1 of 3 loop_assy x.xxx # 0.001 project x.xx # 0.01 scale: 0.048 format - b dwg. no. rev x.x # 0.1 do not scale wa4mnt 3' small magnetic loop antenna 30m-10m x # 0.25 eng: wa4mnt title wa4mnt p.o. box 956 clarkdale, az 86324 928-639-3481 (voice) www.qrpbuilder.com the information contained in this document is the property o There are programs (loop calculator) that produce this information simply and quickly, but actually the basic calculation is of a convenient simplicity. Here is an example for 14,200 MHz: Wavelength lambda = 300 / 14,200 = 21.13 m ¼ lambda = 21.13 m / 4 = 5.28 m Loop diameter = 5.28 m / 3,14 ≈ 5.28 m / 3.14 = 1.68 Magnetic Loop Antenna Calculator updated - Free windows program to calculate magnetic loop antenna.This small loop antenna calculator allow to determine capacitance and voltage based on Loop circumference, desired resonant frequency, conductor diameter and the operating powe Magnetische LOOP Antenne = Mag-Loop, magnetische Antenne, Magnetantenne Als Magnetloop bezeichent man eine Loop-Antenne, welche einen Umfang von kleiner als 0.35 Wellenlänge hat. Die magnetische Loop-Antenne ist eine erstaunlich leistungsfähige Kurzwellen-Antenne, für die kleinen Abmessungen der Antenne
Die Loop-Antenne ist eine sehr einfach aufzubauende Multi-Band-Antenne, die ohne Traps auskommt und ggf. auch ohne Matchbox betrieben werden kann. Eine Impedanzanpassung ist im Prinzip nicht notwendig. Aufgrund der Schmalbandigkeit ist jedoch eine einfache Matchbox hilfreich, um die ganze Breite des jeweiliges Bandes auch mit Transistor-Endstufen nutzen zu können. Alle OMs, die ein mindestens. Magnetic Loop Antenna Calculator. This model is web-based and easy to use. Diameter of Conductor for LMR-400 coaxial cable is .405 inches. Length and frequency variations will change antenna efficiency shown under Results. The calculator indicates the minimum/maximum circumference length at bottom right. Antenna diameter is calculated which is helpful for forming the conductor into a circle. Amy(AI6ZU) and I build a magnetic loop antenna for 160 and 80 meter amateur radio
VK1SV Small circular loop calculator. Enter loop radius in metres: Enter number of turns: Enter transmitter power in watts: Enter antenna impedance (dominated by loop resistive loss) in ohms: Enter frequency in MHz: Enter loop inductance in uH: (Single turn loop inductance calculator here) The wavelength in metres is: The loop area in square metres is: The loop wire length in metres is: The. Following on from my efforts to produce a low cost, lightweight Magnetic Loop Antenna for 80M, 60M and 40M using low cost materials, I was keen to find out if a SML would perform on Top Band. The main conductor is formed from MDPE irrigation pipe 25mm in diameter and shrouded with 50mm wide adhesive copper tape. The determining issues being the size of the loop and the value of capacitance. Magnetic loop antennas for CB are not commercially available even though MLAs for CB can be more effective than other widely used antennas. MLA-S (MMT) QRP Review. I tested the MLA-S (MMT) QRP antenna from my weekend QTH in Divice with power of 4W, using FT8. I had the antenna set up next to the kitchen window. Although I worked with little power, I managed to make some fairly decent. (Bore them or seem mildly 'creepy' and they'll leave you alone.) A magnetic loop antenna is electrically simple and looks like a two turn transformer with a tuning capacitor in the larger loop. The primary of this transformer is a small loop of wire, fed by standard 50 Ohm coaxial cable (coax) that goes to your HF transceiver
*Magnetic loop antennas having a circumference approaching 1/4 wavelength at the operating frequency begin to behave more like a dipole than a magnetic loop, and the conventional models for magnetic loop antennas fail progressively as the circumference approaches 1/4 wavelength. *For a given area, a circular magnetic loop antenna will be more efficient than a square magnetic loop. You need to. Magnetic Loop Antenna Pattern . Technical Information. A small loop antenna appears as a very large resonant circuit. The loop itself can be viewed as a large single turn inductor of this circuit. Due to the large (relatively speaking) size of this inductor, radiation very easily takes place. Experimenters have noticed that the more turns there are to this inductor, the less efficient it is. Discussion of current loop: Index Magnetic field concepts Currents as magnetic sources . HyperPhysics***** Electricity and Magnetism : R Nave: Go Back: Field on Axis of Current Loop. Show geometric details: The application of the Biot-Savart law on the centerline of a current loop involves integrating the z-component. The symmetry is such that all the terms in this element are constant except. Zur Berechnung des Strahlungswiderstandes wird angenommen, dass der Antennenstrom auf dem Leiter eine konstante Amplitude hat. Rs ergibt sich zu: Da in der Regel Loops mit kreisförmigem Querschnitt gebaut werden, stellt man diese Formel um, indem man F=D2π/4 und U=2πD benutzt, wobei D der Durchmesser des Kreises und U der Umfang des Kreises ist. Damit gilt für eine kreisförmige Loop Well, a Transmitting Magnetic Loop Antenna (TMLA) for the 160 metre band might just be the solution you are looking for! There are some caveats you need to consider before constructing this antenna. 1) This antenna is over three metres in diameter and weighs around 30 kilograms. 2) The antenna must be mounted on a suitable post and guyed for stability. 3) TMLA's exhibit very high voltages.
After many requests by Ben W4KSY*, someone I consider to be my loop mentor, I decided to post a page about my 80 meter magnetic loop. The idea for this loop began with my purchase of a new vertical antenna. Now when you think of 26 feet of antenna, it doesn't seem that large until you put it together. Now add a couple of 1/4 wavelength 80 meter radials, and the vertical antenna solution. That means a magnetic loop is actually electric field dominant at a very modest distance in the near field area. If the noise source is coupled to the antenna within a distance of about 1/2 wl or so, you might find a difference in noise coupling between the short dipole and small loop systems. At larger distances, only directivity and polarization would make a difference. So much for the myth. I decided to experiment with Magnetic Loops. First, I tried something simple. A 145MHz 2m loop. Using the software at the bottom of this page, I worked out that a 36cm length of wire, will need a capacitance of around 3.6pf, and around a 50% efficiency The first simple change I've seen to really make a difference in magnetic loop performance.If you like my videos, please subscribe here: http://www.youtube.c..
The magnetic loop OH8STN: On the other side we have the Chameleon P-Loop 2.0. It's tripod-mounted with its capacitor at 2 meters height. It's being powered by the SOTABeams WSPRLite at 200mw. The loop is mounted indoors under the rafters of the attic in my garage. Loop oriented Southwest/Northeast. So not only is it purposely underpowered, it's also indoors (not to worry). The loop. Magnetic Loop Koppelschleifen Beitragsseiten. Magnetic Loop Koppelschleifen Koppelschleifen-Arten bei Magnetic Loops Position der induktiven Koppelschleife Unterschiede der 3 Koppelschleifenarten Alle Seiten Seite 1 von 4. Untersuchungen an Einkoppelschleifen Zurück Weiter >>.
Die Magnetantenne, auch Magnetic Loop oder Magloop, verwendet, anders als etwa ein Dipol, primär die magnetische Komponente des elektromagnetischen Felds zur Erzeugung der elektromagnetischen Wellen. Im Fernfeld sind die Felder beider Antennenformen nicht zu unterscheiden. Zu den Magnetantennen gehören z. B. Ferritantenne und Rahmenantenne. Eine magnetische Antenne im engeren Sinn - eine Rahmenantenne - besteht aus einer, seltener einigen wenigen Windungen mit möglichst großer. Mag Loop calculator is available at That don't leave much left and the mfj antenna cost almost 500.00. I have seen many types of magnetic loop antennas on line only thing is none of them really tell you how to build one or if they do they put in ways not many would understand. I went to technical school got my engineers degree in electronic but its been a long time since I studied. small mag loop antennas produce very high voltages across the capacitor and concentrated electromagnetic radiation Quick and simple way to install the loop . as a manually tuned or fixed frequency . auxiliary antenna . Simple RG213 Mag Loop ( 30m-15m ) - G8ODE. Its amazing what you can do with a bit of spare coax and an old vintage brass 130PF capacitor with 1mm spacing. During the Lighthouse. I want to make a magnetic loop for HF - say 7-28mhz - but i get confused. There are so many designs out there i don't know what is what. Now i do have the 19th edition of the antenna book but for an hf small transmitting loop covering 20-10mtrs it reads that the circumference of the antenna is 8.5 ft and width of 32.4.. is this correct Full-Wave Loop Antenna Length Calculator. Full-wave loop antennas can be large at lower frequencies, but they are quieter than dipoles and have more gain broadside to the plane of the loop. A circular loop is ideal, but squares, triangles, and other shapes can work well; just make the area enclosed by the loop as big as you can. You can use a full-wave loop on frequencies higher than design.
Magnetische Antennen können (wie oben bereits erwähnt) vor allem auf den oberen Bändern durchaus mit Dipolen mithalten. Das gilt im Prinzip auch für die unteren Bänder. Was ich nur immer wieder lese ist das selbgebaute mag-loops aus RG213 mit 80cm Durchmesser im 80m Band betrieben werden. Und die stehen dann womöglich noch im Keller. Das. Be sure to read Leigh's - VK5KLT - paper titled the Underestimated Magnetic Loop Antenna - Helps bring things into perspective. Overview - Looking back. I have used this loop for over six months on nets with around ten or more stations. I have three to four stations within 15km of me and another four within 100km. The result that almost blinds you with its never changing consistency under all.
Magnetic loop antenna for 160 - 15 metres. Another item on this website discussed antennas that amateurs use to operate from confined locations. The smallest antenna described for 80 metres was a magnetic loop. This article provides details needed to build your own. Description. Below is a diagram and some construction details. Note that the element is continuous except for a gap at the top. A magnetic loop antenna may be the answer and they are not as difficult to build as you might think. 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. However, thanks to other hams like Steve AA5TB there are tried and tested designs, calculators. A short explanation for the type of mag loop I wanted to build: It's made from few basic components: Main Loop; Small Loop; Capacitor; The small loop is wired to the radio with coax cable and coupled to the main loop which is connected to the capacitor. My goal was to get an antenna for 40m-10m that can handle 100 Watts. The Capacito Sep 10, 2016 - Magnetic Loop Calculator v.1.6 by KI6GD It's 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. Works either in Standard and Metric units, and let you choose on material, and loopRead More..
Loop Area = ft² m² Radiation Resistance = mΩ Total Loss Resistance = Loop Circumference = ft Wavelength Percentage = % λ Loop Inductance = μH Distributed Capacitance = pF Q (Quality Factor) = Tuning Capacitor = Capacitor Voltage = V Minimum Plate Spacing = mils (1/1000 in) Notes: 1. To truly be considered a small loop, the Loop Circumference should be les Magnetic flux (ΦB) is the number of magnetic field lines (also called magnetic flux density) passing through a surface (such as a loop of wire) is calculated using magnetic_flux = Magnetic Field * Length * Breadth * cos (θ).To calculate Magnetic Flux, you need Magnetic Field (B), Length (l), Breadth (b) and θ (θ).With our tool, you need to enter the respective value for Magnetic Field. A wire loop creates inductance. Inductance is the ability to store energy in a magnetic field. Wire Loop Inductance Description. The inductance of a wire loop is a common textbook example of a circuit with inductance. The variables used in this tool are the diameter of the wire conductor and the diameter of the wire loop. This calculation is for loop and self inductance they are the same for this example Design: There is nothing original about this 20 meter magnetic loop antenna project. I used the calculator at http://www.66pacific.com/calculators/small_tx_loop_calc.aspx to compute dimensions. According to this convenient on-line calculator, 1-inch copper pipe is slightly more efficient than 3/4 inch. However, the latter is easier to work with, and 3/4 inch fittings are more commonly available than larger diameter ones
Small Transmitting Loop Antenna Calculator. 2002 - 2021 i1wqrlinkradio.com Home Mapsite Add Link. Contact. Hits . Small Transmitting Loop Antenna Calculator. Reg, G4FGQ has written programs for calculating the efficiency of magnetic loops. The zip file here extracts to two exe files, rjeloop1.exe and rjeloop2.exe. They both work in a similar way but loop1 does regular square, circular and triangular loops and loop2 does rectangular loops. G4FGQ loop calculators
A magnetic loop is nothing more than a loop of wire or other conducting material connected across the terminals of a variable capacitor. The capacitor resonates the loop to the frequency you require. To get RF into and out of the loop a coupling loop one fifth the diameter of the main loop is made, with its ends connected to the braid and centre of the coaxial feeder. The coupling loop is insulated, and placed so that the mid-point (opposite the feedpoint) is next to the mid-point of the. Just make a saw cut at the end of the loop (inside loop) over a distance of 2 cm. At the end of the groove cut the tube from the inside to the outside for 2/3 of the diameter. Then bend the lips open and align. You 'll have the same or even better results. You need a stepper or dc motor to drive the capacitor The coupling loop I use on my 10-20M loop only needs to be moved down closer to the loop (from the higher 20M position on the mast) when I'm on 17 and all the other bands---in other words, two positions between five bands. I'm hoping that the coupling loop will suffice in one place where it ends up for both 40 and 80 but that remains to be seen. If it needs to be adjusted I don't expect to have a problem with that as this big loop will be just outside my shack (and I don't expect.
Magnetic Loop Calculator v.1.6 by KI6GD It's 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. Works either in Standard and Metric units, and let you choose on material, and. Magnetic loop for 80m OH7SV OH7SV Magnetic Loop Calculator (Excel file I have run some design iterations on a magnetic loop antenna for EMCOMM use on 40m with an eye for testing it as an easy to deploy NVIS antenna on this band. I plan to build this using RG-213 as before but with a diameter of just under 8 feet. Rather than use a variable capacitor, I will use a length of RG-8X coax and tune for a fixed center frequency of 7.285 Mhz. This should allow me to operate on any of the regular 40m traffic nets run here in Texas. It will be easy enough to. Enter the number of loops, change in magnetic flux, and change in time into the calculator to determine the induced voltage
The efficiency of the loop is η = (Ra / Ra + RL) x100 % where Ra = Radiation Resistance & RL = resistive loses in loop & capacitor. - at 7MHZ η=21.4 % 6. The losses (RL) can be minimised by using large diameter copper tube or aluminium and by using a high quality capacitor designed for loops e.g. butterfly capacitor Due to their simplicity and operating mode, magnetic loops are one of the most used traffic sensors in Intelligent Transportation Systems (ITS). However, at this moment, their potential is not being fully exploited, as neither the speed nor the length of the vehicles can be surely ascertained with the use of a single magnetic loop. In this way, the vast majority of them are only being used to count vehicles on urban and interurban roads. For this reason, in order to contribute to the. This small magnetic loop antenna was designed for installation on the top of the roof and remotely tuned by a small geared DC motor coupled to the variable air capacitor shaft. The motor is controlled by a PWM circuit that precisely sends DC voltage on a train of pulses for fine tuning the antenna to the resonance point. The antenna is made with 2.80 centimeters of Cell Flex cable shorting the.
A solenoid is a coil wound into a tightly packed helix. In physics, the term refers specifically to a long, thin loop of wire, often wrapped around a metallic core, which produces a uniform magnetic field in a volume of space (where some experiment might be carried out) when an electric current is passed through it. Inductance is the property of a conductor by which a change in current flowing. The starter kit includes the Capacitor with a 6:1 reduction gear installed. It's already wired and soldered making this the perfect kit for the beginner. It includes enough LMR-400 for a main loop and pickup loop if building the 40-10M version of the man portable loop. The Magnetic Loop Starter kit includes: 1 X PRE-ASSEMBLED CAPACITOR. 600 Vrms MA A loop system is one method, or technology, for providing assistive listening. There are other methods too, such as FM, Digital, Infrared, and Wi-Fi. So, choosing an effective technology that is appropriate for the venue and the audience is very important. There are several advantages to using a loop system for assistive listening: 1. People with t-coil equipped devices including hearing aids or cochlear implants) are able to hear the audio program without additiona loop1-e. Magnetic Loop Antenna = MagLoop, Small Transmitting Loop. A loop antenna is called magnetic loop if the circumference of the loop is smaller than 0.35 wavelength. The magnetic loop antenna is an extremely efficient short wave antenna for the small size it constitutes. It consists of a loop radiator made of copper or aluminium.
A loop antenna is actually sensitive to the magnetic field and not the electric field (it is also called a magnetic loop). It outputs a voltage proportional to that field. A particularity of this type of antenna is to provide a voltage proportional to the frequency of the signal. The antenna performance is influenced by the number of turns and the area of each loop. For a ferrite antenna, the. K3ZXL - 160 Meter Receiving Loop Project Dan Schaaf 20 January 2010 _____ For several years, I have been struggling with atmospheric noise on the 160 meter band. I have no space on my city lot for a K9AY Loop or a Beverage antenna. On one of the reflectors I saw a comment by N7TK, John, that he uses a coaxial loop on 160 for receive. I asked him about his success and his response was favorable.
software di progettazione per loop magnetico. Questo strumento pratico aiuta a calcolare le dimensioni per costruire un'antenna Loop Magnetica per le varie frequenze. RJELOOP1.exe. Ricetrasmissione, singolo-turn, antenne ad anello di varie forme regolari. dal Reg, G4FGQ This magnetic flux calculator calculates the magnetic flux of an object based on the magnitude of the magnetic field which the object emanates and the area of the object, according to the formula, Φ=BA, if the magnetic field is at a 90° angle (perpendicular) to the area of the object. If the magnetic field is not perpendicular to the object, then use the calculator below, which computes the. Loop conductor length (m) Feeding loop diameter (m) Frequency (MHz) Inductance (uH) Capacitance (pF) Main loop diameter (m) Conductor diameter (mm) Magnetic loop antenna calculator for round copper construction 1.8.2004 OH7SV XL = XC (ohms) Distributed C (pF) Tuning capacitance (pF) Radiation resistance (ohms) Loss resistance (ohms) Efficiency (%) Loaded Q Enter here Compared to ideal loop (dB. Find the total magnetic field when the magnetic flux is 25 and the area is 5. This implies that; φ = Magnetic Flux = 25 A = Area = 5. B = φ / A B = 25 / 5 B = 5. Therefore, the total magnetic field is 5. Nickzom Calculator - The Calculator Encyclopedia is capable of calculating the magnetic flux EMI (Electro Magnetic Interference) deals with unintended transmitted or received signals which trouble your circuit or experiment. Even so circuits developped and used at an university need not to pass all rigid tests for consumer electronics, you mayst shoot yourself in the foot if they do not. Here we present a Magnetic Field Probe and explain how to use it
A Magnetic Loop Antenna is basically just a resonant circuit using an oversized inductor and an adjustable capacitor.. If the inductor has a circumference of much less than, say, 1/10 th of a wavelength, then the efficiency of the antenna will suffer. If the inductor circumference approaches ¼ of a wavelength or more then the antenna would more accurately be characterized as an electrical. The magnetic loop design leads to antenna which is tuned to a very narrow frequency range, giving good selectivity. However, it also requires retuning quite often in order to stay on-band. [Eric. These relationships for a finite current loop extend to the magnetic dipoles of electron orbits and to the intrinsic magnetic moment associated with electron spin. Also important are nuclear magnetic moments. Index Magnetic force applications Magnetic field concepts . HyperPhysics***** Electricity and Magnetism : R Nave : Go Back: Torque on a Current Loop. The torque on a current-carrying coil. The magnetic field generated by the electric current, around a straight wire, is related to the electric current and the distance r from the wire. (The conductor is considered infinite length, when the distance r is very small compared to its length.) Related formulas. Variables . B: Magnetic field (T) μ 0: magnetic constant: π: pi: I: Electric current (A) r: Distance from the wire (m. Home-Made Magnetic Loop Antenna for 30 Meters. A magnetic loop antenna, so named because it responds primarily to the magnetic rather than electrical component of a radio wave, is a very small (relative to wavelength) single-turn loop tuned to resonance with a series capacitor. A second, much smaller loop connected directly to a coax feed line is placed inside the larger loop, near the side.
Small Magnetic Loop Antenna Calculator ver. 1.22a Number of turns= n= Modified for MultiLoop by NO5V Novemeber 5, 2019 Modified for Multi-Loop Analysis 5. Note that Radiation Resistance calculation is using a different formula to account for multiturn 2.00 3.14 60.00 12.00 1.52 0.03 0.76 2.00 0.31 7.98E-03 0.03 3.99E-03 2.00 0.00 0.00 1000.00. Shop magnetic and wire/PVC frame small loop HF antennas and cross loop antenna kits at DX Engineering! 1-800-777-0703 My Account Hello, Log I Homemade Magnetic Loop antenna for 27 MHz. Else known as Small Transmitting Loop or STL, this isn't a traditional electric antenna, because the near field is almost magnetic. This interesting feature makes the ground plane losses very low and generally this antenna has little dimensions. Besides, STL produces little or no TVI and reception is clear from static noises and man made noises.