# Am Loop Antenna Calculator

This indoor small magnetic loop antenna was an interesting antenna to build and use. Enhancing Omnidirectional NVIS and DX for the Alpha HD-FMJ and ProMaster Antenna. Horizontal positioning into a TRIANGLE shape, makes it a DELTA loop, If you put it into a square, or rectangle shape, you have a BOX loop antenna. Mar 8, 2013 5:01 PM, By Doug Irwin CPBE DRB AMD. MLA-M Magnetic Loop Antenna. Most of the tomes used by the last generation of AM consulting engineers date back to the 1940s and are no longer in print. The circumference of a true magnetic loop should be less than 1/10th wavelength and the coupling loop at 1/5 ratio to the main loop. This forms a parallel resonant circuit which, if the component values are correctly chosen, can be tuned across the band of frequencies we are interested in. _____ AM Loop Antenna Calculator UMR EMC Lab Formula Version 1, 7-8-2004 by Bruce Carter _____ Inserendo l'altezza e la larghezza del ciclo (36 o 48 pollici ciascuno se la costruzione di cui al precedente) e il numero di giri e la distanza tra una svolta (1 uso 0,5 nel mio disegno in modo modifiche che, se necessario) si otterrà la frequenza gamma del design dell'antenna. Above: Screen shots from several EZNEC v. DX Engineering receive antenna systems feature the best designs available for HF DXing, as well as for “AM DXing” on the MW Broadcast Band and for the Short Wave Listening bands (SWL). Overview of Loop The Horizontal Loop Antenna is one full wavelength at the lowest frequency used. 7/ Measure the loop inductor (4. Long-wire antennas and arrays ultimately rest on the basic performance properties of a single end-fed long wire. It works fine when they are similar in size but I'm having difficulty if the receive loop is significantly larger or smaller than the transmit loop. 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'. Loop antennas can work on other frequencies also but need some modification because of the frequency property differences. The attainment of a high-Q tells us that the loop antenna is not lossy and inefficient. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. (It does not calculate inductance, impedance, or even "Q" factor values since it is assumed that. i home-brewed a GP using a maco type tuning ring. TG39 WOODEN INDOOR MEDIUMWAVE LOOP ANTENNA SPECIAL DESIGNED FOR MW BAND Great news! We have the new item - TG39 wooden indoor MW loop antenna available in our eBay Store (the eBay item number are 370000079325 and 370000079240)! This TG39 antenna is special designed by the designer of DE1103 radio. Below you will find plans to build a three or four foot box loop for the AM broadcast band. Welcome to Cecil's Amateur Radio Home Page Cecil Moore W5DXP, ex WN5DXP, of Tyler TX, has a page on antennas. find a coil calculator on web input wire gauge, number of turn s, form. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. A Small, Portable HF Loop Antenna John Wagner, N8CD - September 2014 AA5TB's Loop Calculator spreadsheet. 144MHZ , 144 Mhz , 2 meter , Loop , Antenna - $47. 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. Wouldn’t use anything else now. Parts List: R1 = 1M; C1 = 470pF; C2 = 470pF; L1 = 20uH to. org Log Periodic Dipole Array - arcticpeak. The other area of loop design not addressed in your calculator is ground. The magnetic field will be perpendicular to the whole loop carrying the current. About AM Loop Antenna Calculator The resource is currently listed in dxzone. 45 inches deep (0. Matt Heere 151,789 views. Fast & Free shipping on many items!. G5RV Multi Band HF Dipole Antenna. As you may remember, back in May, I picked up a beautiful home-made loop antenna. Ferrite Rod Coil Calculator - 5. These antennas are fundamentally different from the large loop types, and are very often the antenna of choice for low frequency work. If the doughnut is standing on the ground with its axis horizontal, there will be a null through its center (on its axis). 1 1 1 1 1 Rating 5. The average power at the antenna: In watts The antenna gain in dBi: Enter 2. _____ AM Loop Antenna Calculator UMR EMC Lab Formula Version 1, 7-8-2004 by Bruce Carter _____ Inserendo l'altezza e la larghezza del ciclo (36 o 48 pollici ciascuno se la costruzione di cui al precedente) e il numero di giri e la distanza tra una svolta (1 uso 0,5 nel mio disegno in modo modifiche che, se necessario) si otterrà la frequenza gamma del design dell'antenna. Medium Wave AM Broadcast Band Resonant Loop Antenna. Antenna Loop, Verona, Italia, VHF. It was a leftover from a contruction site, but still a good 9m long. The most common application of loop antennas is for the reception of broadcast signals in the mediumwave (AM) and longwave bands. Those whose passion lies in using portable receivers, including the popular Ultralights, rely on the ferrite loop inside the receiver. Here's a circuit for a simple Loop set. Antenna Theory - K9ERG Antenna Theory - Analysis & Design Antenna Theory - DX Zone Antenna Theory - NVIS in pdf. Date published: 2020-04-03 Rated 5 out of 5 by katycruiser from Best Sound Ever!. Magnetic Loop Antenna Question. i made mine out of 1 inch x 1/8 inch thick aluminum strip from lowes. LFA Yagi Antenna. It was based on an old antenna that they posted the measurements on the digital home Canada forums. Antenna and Techniques for Low-Band DXing, by John Devoldere, ON4UN (the Third Edition is titled ON4UN's Low-Band DXing). An AM loop antenna is one of the true marvels of electronics. Multi-band with antenna tuner. In the case of the MFJ-259B, that's easy to do. Been looking at two different loop calculators to work out capacitor values over a range of frequencies. STL's (Small Transmitting Loops) are a type of antenna that I had never experimented with in all my years of hamming, and I decided it was time to change that. A A & A sold the same antennas to Her Majesty's Navy. Focus is chiefly on tuning capacitor. Interest in the electromagnetic properties of loop structures has surged with the recent appearance of split-ring resonator meta-materials (SRRs) and nano-antennas. The loops for the antennas were embedded in the fibreglass hulls of some vessels and the capacitors could be remotely tuned from the radio room. Presuming that "18 inch" refers to the embroidery hoop's diameter, 15 closely spaced turns should be about right. 500 to 1700 Khz is my primary objective. This AM/FM antenna kit designed for improve the AM/FM signal, help you get more stable am/fm signal and stations for stereo receiver radios. The average power at the antenna: In watts The antenna gain in dBi: Enter 2. Maximize your signal and minimize noise with antenna accessories such as antenna switches, vertical add-on kits, variable phasing controllers, baluns, radial. I have checked the loop with my antenna analyzer , and actually it will cover 80 meter band from 3. Loop Antennas -- Discussion Group - from Yahoo Forums Loops for AM BC Band - From Dave's Antenna Loop page PAR High-Performance Shortwave Antenna HF End Fed SWL antenna Quantum QX Loops-- From DX Tools Random Wire Antenna and Improved Random Wire Antenna-- From CW's Radio Pages Understanding SWL And Antenna Design/Construction-by Harold Melton. FM, SSB, AM etc. Those whose passion lies in using portable receivers, including the popular Ultralights, rely on the ferrite loop inside the receiver. EDIT: I've just looked at the original AM loop antenna, and it may actually be two or three windings of wire - rather than a single loop as I previously thought - but it can't be many - the wire used is quite thick - and the frame itself is very thin. My initial tests were disappointing. Problem, when trying to build a loop antenna at 3. The (untuned) loop antenna can be modeled by a voltage source Uo, the radiation resistance Rr, the loop's conductor loss resistance Rl and the loop's inductance L in series. I built this antenna when I lived in an apartment complex which does not allow antennas and where I had no real estate to play with. Satcom Resources is single source destination for satellite equipment. Within this physical description there are two very distinct antenna designs: the small loop (or magnetic loop) with a size much smaller than a wavelength, and the resonant loop antenna with a circumference approximately equal. The example I loaded was the 3 foot ribbon cable loop, and with 9 turns on 0. Magnetic Loop Calculator - IW5EDI Simone - Ham-Radio Small Transmitting Loop Antenna Calculator • 66pacific. The loop is tuned with a variable 30-365 pF capacitor in parallel. 2 for antennas rated in dBd The distance to the area of interest: From the centre of the antenna, in feet The frequency of operation: In MHz. 050 centers it would be 0. zip HF wire ant & trans line design v1. EST (770) 614-7443 Phone (678) 731-7681 Fax E-Mail 312 Swanson Drive Suite B Lawrenceville, GA 30043. Construction Tips zIf Building "Loop Up" Can Cheaply. The “really field expedient” Jungle Antenna: You can also make the antenna and feedline from “assault wire”, WD-1/TT, WD-1A/TT, whatever you have and little else. Within this physical description there are two very distinct antenna designs: the small loop (or magnetic loop) with a size much smaller than a wavelength, and the much larger resonant loop antenna with a. AM Loop Antenna Calculator. I used the outer screen from the coax and the results of the loop where good. electrical antennas. org The Problem with listening to distant medium wave radio stations Radio stations on the "Medium Wave" (MW), or AM band, are can be difficult to hear clearly. The length of wire used in a delta loop antenna is determined using 1005/[frequency in Mhz. Within this physical description there are two distinct antenna types. The radiating element is a quarter wave (λ/4) and the radials are 12% longer. The impedance at the loop […]. A program that lets you see what the polar diagram of your relatable beam antenna actually looks like. One of the advantages of using a ferrite in the antenna is that it brings the radiation resistance of the overall antenna to a reasonable level. The receiver is a DX-398 portable. Here's a circuit for a simple Loop set. PA3GZK did the test with a Kenwood TS-480 tuned to the 80 meter band and the noise signal from a farm about 500 meters away. You can easily construct this ca- INotes appear on page 32. Dark blue figures are adjustable; red figures are the answers. 00mF capacitance, 0. This is an easy antenna to build and the materials cost about$15-20. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor connected in parallel to receive weak AM stations. • To be a magnetic loop, the loop circumfrence must be less than 0. Because of the low value of Rr in a small loop antenna the conductor loss is a significant part of the total resistance. Antennas for RFIC Transmitter and Receiver Part I : Loop Antennas Efficiency of Small Loop Antenna Small size printed loop antenna is widely used in many applications for RFIC transmitters and receivers. loop antenna can be additionally improved by inserting a ferromagnetic core. KI6GD also appears to follow the ARRL formulas and therefore produces some incorrect results. Larger than that, and you have matching issues with self-resonance. The loop really surprised me as I discovered that it had sufficient gain in order to resolve full RDS from meteor scattered signals. This will be of interest when connecting the loop directly to the input of an field effect transistor (FET) head-amplifier. Need a really simple antenna for better indoor 2 meter operation? Try this vhf delta loop you can hang in any window. I’ve chosen to modify my build, preferring a double turn loop for 80, 60, 40M, with a switch to optionally use a single turn 40-10m loop like the Chameleon P-LOOP. It is a full size antenna on 40 meters and a shortened 80 meter antenna. I'm attempting to do some theoretical analysis of the antenna, to see if our results match up with the theory. Shop for am radio antenna at Best Buy. The MFJ magnetic loops are about 36 inches in diameter, made of aluminium, which is welded to the tuning capacitor to minimize losses. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. WIKIPEDIA, The Last Word on zUse Online Mag Loop Calculators for. auxiliary antenna. Load the loop antenna with a very high Q capacitor (should be higher than the coil itself), such that it resonates near the frequency of interest. The VHF Loop kits offered here are an excellent antennas in their own right, providing for a very small antenna with very respectable performance. The antenna has a broad coverage angle with a deep null when the antenna is broadside to the signal. The design is based on the principle known to all amateur radio operators that the most important part of a transmitting or receiving system is a good antenna and a well matched transmission line. I tried an AM loop antenna from a Teak AG-780 receiver and also tried a tunable AM ring antenna from Radio Shack that works on a Panasonic mini-receiver. This indoor small magnetic loop antenna was an interesting antenna to build and use. I am basically looking for an omnidirectional 2 meter antenna with 6-8 dbi gain. Update Jan 30: The large performance chart above (as previously mentioned) compresses the gain figures since these numbers are much smaller than those for the F/B. Now the loop is larger than 1/10th of a wavelength, and you null directions will change, may not be as deep, etc. 93 HP 4342A Utilities. RF Engineering Training, also known as Radio Frequency Engineering, is a subset of electrical engineering that deals with devices which are designed to operate in the Radio Frequency spectrum: range of about 3 kHz up to 300 GHz. 5 with no velocity factor. G5RV Multi Band HF Dipole Antenna. In a large dipole or vertical antenna the feed-point resistance may be almost equal to the high value of radiation resistance. 2 Home Made HIGH POWER Magnetic Loop. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line (possibly via a balun). Indeed there are two different types of loop antennas, The first of these is the ferrite bar as build into practically every portable radio, the other is wound on an air-core form, and is far less popular with radio. Loop Antennas -- Discussion Group - from Yahoo Forums Loops for AM BC Band - From Dave's Antenna Loop page PAR High-Performance Shortwave Antenna HF End Fed SWL antenna Quantum QX Loops-- From DX Tools Random Wire Antenna and Improved Random Wire Antenna-- From CW's Radio Pages Understanding SWL And Antenna Design/Construction-by Harold Melton. Antennas, ground systems. The inductance was found to be about 3 mH. 5 ft diameter loop for 40m vs the same conductor length in two turns with a diameter of 3. Will the 2:1 balun work? it said "loop antenna matcher" on the description. 2" dia wire, 72' circumference, 3. Wire Antennas UK receive antenna systems feature the best designs available for HF DXing, as well as for “AM DXing” and for the Short Wave Listening bands (SWL). So far my activities today. This antenna works great on the AM band because of the properties of these frequencies. 2 for dipoles; add 2. My own (as in yet another) calculator for small-loop transmitting antennas functions differently from all others. Especially if yiu can get tge active antenna outside and away from buildings. The loop is Based on Don Moman's famous loop his drawing is at the bottom of the page. The receiver is a DX-398 portable. I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. This calculator uses a "K" multiplying factor value of. About AM Loop Antenna Calculator The resource is currently listed in dxzone. 26/09/06 - 13:39 in Radio #1. AM Broadcast Band Loop Antenna, Very Effective. RG-8 Length not critical. Here is a great calculator for sorting out lengths, values, etc. The AM antenna has 2 pin tin-plating twin lead bare wire to connect the AM antenna jack of stereo receiver audio video av receiver home theater amplifier system etc. Alpha Antenna offers four optional 35 foot NVIS Elements, which enhance the performance of Near Vertical Incidence (NVIS) and DX for either the HD-FMJ and ProMaster systems when either is[…]. In general, the longer the antenna, the better. Most designs of active loop antenna use an amplifier with an input impedance in the region of 1 to 100 Ohms. 500 to 1700 Khz is my primary objective. It is a full size antenna on 40 meters and a shortened 80 meter antenna. Loop antennas For low frequencies below 30 MHz, loop antennas are ideal for magnetic field strength measurements. This antenna works great on the AM band because of the properties of these frequencies. Having a turntable made it possible to solidly mount the hoop to the base. Enter the Frequency in MHz. ( 2 meters ) Omni-directional Heavy Duty Loop Antenna. Ferrite Rod Coil Calculator - 5. 9 feet length with an push-in F connector, Very easy to install, just plug it into the back of the stereo or radio. But if you are designing your own loop antenna, please read on. A great antenna giving an immediately notice the great difference between the two gains which reaches 6. It appears that you are using AdBlocking software. I have checked the loop with my antenna analyzer , and actually it will cover 80 meter band from 3. Antenna bandwidth: 10. However I highly recommend to follow my instructions , which are based on computer antenna simulation software 4nec2, to maximize performance. This is the loop aerial my dad built in 1958. I used 24 gauge wire and had to wrap 18 turns to get an inductance of about 250 uH. Here's some quick tips and tricks that may help you get on the HF bands with an indoor antenna. There is also another form available to compute the. then the maximum voltage across the capacitor is. ) Remember the AM Loop Antenna you have just constructed works best from the front and back of the picture. Need a really simple antenna for better indoor 2 meter operation? Try this vhf delta loop you can hang in any window. I have checked the loop with my antenna analyzer , and actually it will cover 80 meter band from 3. I liked the way the antenna worked so I built a second one and stacked them for some additional gain using a phasing harness with impedance matching. It exhibits 1. Aim the "edge" of the loop toward the AM station you want to receive. Here is a summary of my conclusions: • A better formula for determining the inductance of loop antennas is needed. Loop Antenna for AM Radio A loop antenna can greatly improve medium wave reception. The directional quality improves signal to noise ratio of the desired signal while rejecting signals perpendular to the plane of the windings. AM Antenna：4. 00 Quantity: The AM BC active broadband coaxial wound loop is used in conjunction with an AM broadcast Receiver. Limited space doesn’t have to mean limited HAM radio performance. Сomments from anonymous guests are enabled with moderation. If you need to use it for both the 40 and 60 kHz JJY signals, simply resonate the loop on frequency of the weaker of the two time signals. The output voltage U for an electrical field strength E is then given by U = heff $E The effective height of a loop antenna is heff = , 2onAcos w k where n is the number of turns, A is the loop area, λ is the wavelength, and ϕ is the angle between loop plane and transmitter. It gives you the appproximate length of, for instance, 75Ω RG-11/U coax or whatever you want to use; again, make the initial cut a bit longer than you need, and shorten it after an initial test with an antenna analyzer. Comparison of active magnetic loop antennas, DD1US: Costruzione di un'antenna loop magnetica, IK2SXX: Compact VLF / LF air-core loop antenna, DL4YHF: Experience with Loop Antennas for LF and VLF, G4CNN: Experiences with Loop antennas at, G3YMC: Five Band Indoor Magnetic Loop Aerial, G4IZHC: Introduction To Magnetic Loop Antennas: Les Loop en LF. This all caused higher efficiency on all bands, especially on 40M band which was missing in the 3th version of UltraLight MLA. Since closed loops are not subject to "end-effect" the calculated physical lengths with this formula are longer than corresponding dipole dimensions and are close to free space dimensions. A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line (possibly via a balun). Notebook showing Small Magnetic Loop antenna results by cutting and testing method. The AM antenna has 2 pin tin-plating twin lead bare wire to connect the AM antenna jack of stereo receiver audio video av receiver home theater amplifier system etc. Article from This loop antenna can be used as the LC circuit of Crystal Radio or Regen radio. Antenna modeling software produced by Roy Lewallen, W7EL. It couples to the magnetic field of the radio wave in the region near the antenna, in contrast to monopole and dipole antennas which couple to the electric field of the wave. zip Yagi Design prg for 144 MHz and up - WA2TIF ariel15. There are usually four radials, three being a minimum, but you could use up to six. Loop-Antenna Operation. It can be made unidirec-tional by adding a 5% longer second loop behind it, as in a quad antenna, or by placing it in front of a flat con-ductive screen. All you need is a loop antenna with a variable capacitor. The impedance across the tuned loop at resonance is computed. Active HF Antenna AMPLIFIER project. 7, 494, and 983. I've used this calculator to build a 2 turn loop for 40m using LMR400 coax and an MFJ-19 butterfly cap. Most of the tomes used by the last generation of AM consulting engineers date back to the 1940s and are no longer in print. Neither work with the TX-8011 receiver. 1 1 1 1 1 Rating 5. Many hobbyists have build round loop antennas. The directional quality improves signal to noise ratio of the desired signal while rejecting signals perpendular to the plane of the windings. Indoor VHF Antennas. com in a single category. However, before you have any signals to notch out, you must first, of course, have some signal to begin with. The magnetic field will be perpendicular to the whole loop carrying the current. • To be a magnetic loop, the loop circumfrence must be less than 0. When I was younger and dumber, used to think loops were old timey and outdated, you always saw them with antique stuff. The calculator program available for download to design this antenna is in xls spread sheet format and requires that you have a program that will read xls spread sheet files. 0 feet at the specified frequency of 7 MHz). 5 MHz and Below. Tested up to 1000 watts SSB. calculate the inductance of circular wire loop. That length can be divided by 3 for a delta loop or 4 for a quad style loop. There are probably some discoveries to be made in the future with loop antenna research. How to Make the Ultimate AM Antenna Carver Corporation of Lynnwood, Washington once made the ultimate AM Stereo/FM Stereo tuner, the Carver TX-11b. Matt Heere 151,789 views. The air coil technology isolates AM and FM elements for increased radio reception, less static and noise. Wire Antennas UK receive antenna systems feature the best designs available for HF DXing, as well as for “AM DXing” and for the Short Wave Listening bands (SWL). About AM Loop Antenna Calculator The resource is currently listed in dxzone. Unless otherwise indicated, I used EZNEC to prepare all antenna analysis information contained in my pages. I started thinking about magloops as they are called when looking for an alternative to tall, lengthy verticals for both indoor and mostly outdoor use. Been looking at two different loop calculators to work out capacitor values over a range of frequencies. The MFJ magnetic loops are about 36 inches in diameter, made of aluminium, which is welded to the tuning capacitor to minimize losses. Find low everyday prices and buy online for delivery or in-store pick-up. While I was familiar with loop antennas, I had never tried using one. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. You can find information here from vertical antennas to loops and from Moxons/Yagis to Quads. The antenna is about 30 metres from the shack and at the highest point of the garden. Our specialists will help you choose the best antenna for your home or office. com Inputting the same information, the first one gives the values as about half that of the other. However, a small indoor loop will not pick up as much signal as a large outside Antenna and Earth, so your hope for a "great" result may be somewhat limited. The results are conveniently displayed in inches, centimeters, feet and meters. find a coil calculator on web input wire gauge, number of turn s, form. Figure 2 — Vertical (blue) and azimuthal (red) radiation patterns for the hourglass antenna. A magnetic loop is essentially a small loop antenna whose circumference is less than 1/10 of the wavelength. The Terk Advantage AM antenna has exclusive, adjustable tuning allowing you to tune to your favorite AM radio station. Hence here is the Double BiQuad Antenna and BiQuad Antenna calculators for handmade antenna based on average data. The attainment of a high-Q tells us that the loop antenna is not lossy and inefficient. Implantable loop antenna have a loading effect due to the Dk =80 of water so the capacitance of fluid has 80 times more than air and this reduces the self resonant frequency of any tiny coil inductance by sqrt (80) or almost f/9. As a result, these antennas are most often used as receive antennas, where impedance mismatch loss can be tolerated. steve1024 Posts: 139. my vertical was taller though. Using an open-wire parallel feedline (commonly called "ladder line") with an antenna tuner, it tunes up on the 10m band as a 5/8-wave loop as well. Full-Wave Loop Antenna Length Calculator. The more rigid self supporting version better suits. For that article, I bought the very popular AlexLoop "WalkHam" antenna. 45 inches deep (0. This calculator uses a "K" multiplying factor value of. This indoor small magnetic loop antenna was an interesting antenna to build and use. [Jeri] Builds A Magnetic Loop Antenna November 2017 Most new hams quickly learn that the high-frequency bands are where the action is, and getting on the air somewhere between 40- and 160-meters is the way to make those coveted globe-hopping contact…. This formula to obtain the length of a half-wave dipole antenna will give a good ballpark value to start with. 5 ft diameter loop for 40m vs the same conductor length in two turns with a diameter of 3. 1uF capacitors from the supply line to the collector resistors of the two transistors and 100K resistors to dissipate any static on the loop. Hello Operators Last month I published the teaser video for the Ultimate Man Portable Magnetic Loop antenna build. Check out the KI6GD Loop Calculator available for download here; it's very useful tool in figuring out what you need for a particular loop build:. How to build your own Frame-Antenna! KainkaLabs. My first 20 meter delta loop was mounted kind of low to the ground, but it did okay. Frequency response is 530 kHz to 1720 kHz (broadband). The loop was positioned right next to the receiver. Will the 2:1 balun work? it said "loop antenna matcher" on the description. Amateur applications of the small loop include direction finding, low-noise directional receiving an-. Although they can also be used as transmit antennas, loop antennas have low radiation resistance and high reactance which makes it difficult to match them with the impedance of transmitters. Description. In a small loop the feed-point resistance must include the significant value of conductor loss. 10-80 Meter Alpha Loop antenna (100W 10-40M, 20W 40-80M) 500. Loop antennas can work on other frequencies also but need some modification because of the frequency property differences. NEC 2 model AM receive loop. I can say enough about the performance of these antennas. However, a small indoor loop will not pick up as much signal as a large outside Antenna and Earth, so your hope for a "great" result may be somewhat limited. Comparison of the 190' double extended zepp vs. 5 feet length with 2 Pin Bare Wire, just plug it into the back of the stereo or radio. You set frequency range with hula-loop diameter and 5K tuning potentiometer. Best to have 2 antennas to compare signals! Devote at least a year to test antenna before giving up on an antenna. Plug in all the factors for the loop that you want to build and follow my rule for length of conductor. Generating the Correct Antenna Pattern - Optimum Height The correct antenna pattern, shown in Figure 1, is surprisingly easy to generate. What follows is a very inexpensive indoor receiving loop which covers both 80/75 and 160 meters. Delta Loop Antenna 10m-11m + Balun 4:1. Beverage Antenna Analyzers -- Manufacturers Antenna Discussions -- Lots Of Antenna Info From the CQ Contest Archives Antenna Discussions -- Tons of Antenna &…. The build utilises the DIY Magnetic Loop Starter Kit from Chamaeleon Antenna. Our line of TV antennas are the world's most comprehensive and powerful antennas you can find. I am in the process of designing a small receiving loop antenna for the lower HF bands. Magnetic loop receive antennas are a great weapon in the fight against natural and man-made noise. The "loop" part of the antenna is the inductor, and the tuning capacitor makes it resonate at a desired frequency. 5 ft diameter loop for 40m vs the same conductor length in two turns with a diameter of 3. Portable Magnetic Loop Antennas Ham Radio's Best Kept Secret Eric Norris WD6DBM v2. Sheet 1 (2) is used for building the antenna with a PVC housing covering the antenna. i had 108 inch sloped ground elements on it. You could use a very specific capacitor and not have it variable if you were. There are tons of instructional websites out there to assist in making one. Loop inductors are also found inside metal detectors. The efficiency of a loop antenna becomes a key issue for the performance of the radio, and the antenna design has become more and more important.$419 for the MFJ 1786 is a lot of money in the context of looking at numerous web sites where people have built their own loops – at considerably less cost. Terminated Loop Basics The K9AY Loop is one of several published designs that use a terminated loop to get a directional pattern in a small space. The results are conveniently displayed in inches, centimeters, feet and meters. The loop is tuned with a variable 30-365 pF capacitor in parallel. The small loops, regardless of their shape, have a far-field pattern very similar to that of a small dipole (normal to the plane of the. Latin America Probably doesn’t need listening antenna. There are many kinds of loops, ranging from simple, passive loops for AM/LW or SW reception to expensive amplified loops of both the tunable and broadband variety such as the Wellbrooks, Pixel, AOR, Belar and others. AM Loop Antenna Calculator. Having a turntable made it possible to solidly mount the hoop to the base. The loop was positioned right next to the receiver. The station is over 150 miles away. CRYSTAL SET RADIO Make a working portable AM radio without batteries Crystal Radio with Loop Antenna, Make a working portable AM radio without batteries. 5 mhz because it is now a different animal so to speak. After owning the IsoLoop and doing some research on the Internet on small transmitting loop antennas there is quite a large (and cult-ish – in a good way) community of loop builders. An antenna mounted up high can “see” farther over the horizon. The average power at the antenna: In watts The antenna gain in dBi: Enter 2. Loop Antennas and Calculator KA1FSB loop calculator give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. I use dipoles or end fed random wires when. The antenna is simply a PCB track (35micron x 2mm, 12mm diameter loop) with a short transmission line (track) to it. The advantage of this antenna over passive version is an additional boost about db in signal strength. Shielded-Loop Receiving Antenna Schematics, mechanical drawings and picture of a Receiving loop antenna by N5ESE - N5FC. Useful links. The larger the wire, the wider the bandwidth. Comparison of the 190' double extended zepp vs. Loop Antenna Basics and Regulatory Compliance for Short-Range Radio the basics of loop antenna design for Short-Range Radio using integrated PLL transmitters, pdf file: Loop antenna resonant frequency calculator: Loop antenna calculator Loop Antenna Dimensions, A square or diamond loop shape, A rectangular shape with a 2:1 ratio, (where the. If you are using one of my designs shown on these pages, you are all set to go ahead. The antenna tunes from 10 through 20 meters and is rated for 100 W input. Requiring no power, it takes advantage of the resonant properties of an inductor and a capacitor connected in parallel to receive weak AM stations. In other words to increase radiation resistance, the loop has to be made spatially larger. Joined: Jan Thu 01, 1970 1:00 am Posts: 366 Location: Woodland Park, N. Obtained from simulations. Loop antennas have been widely used for many years in direction finding systems particularly aboard aircraft and vessels. I have no space on my city lot for a K9AY Loop or a Beverage antenna. The radio is a Fairbanks Morse that my dad bought new in 1936, when he was a teenager. Ahh, the good old quarter wave ground plane! This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. 90 - Double-Delta Antenna 80m and 40m. The strongest signal will be received when the antenna end or edge is pointing to the signal source. Receiving antennas can be characterised by their “effective height” heff. 1uF capacitors from the supply line to the collector resistors of the two transistors and 100K resistors to dissipate any static on the loop. So here's a modernized metric version of the Joe Carr and UMR EMC Lab formulas, with an implementation. about calculators!) If the input power is increased by a factor of. Mar 8, 2013 5:01 PM, By Doug Irwin CPBE DRB AMD. Building and experimenting with antennas can be an interesting part of the radio hobby. The air coil technology isolates AM and FM elements for increased radio reception, less static and noise. AM Broadcast Band Loop Antenna, Very Effective. I am in the process of designing a small receiving loop antenna for the lower HF bands. Limited space doesn't have to mean limited HAM radio performance. I liked the way the antenna worked so I built a second one and stacked them for some additional gain using a phasing harness with impedance matching. A loop antenna is actually sensitive to the magnetic field and not the electric field (it is also called a magnetic. A loop delivers approximately 1. Won't beat a circular loop for sure, but you have to do what you have to do. It works even better if you add reflectors below the V-dipole: six of the same rods you used for the antenna, each rod 54. The loop was wound with 36 turns and centre tapped. Joe Wysochanski Antenna's. Figure 2 — Vertical (blue) and azimuthal (red) radiation patterns for the hourglass antenna. Magnetic loop receive antennas are a great weapon in the fight against natural and man-made noise. If one considers all of the above factors, the three loop design shown left, offers the best overall performance. The free end of that rope is tied off near the ground. I am thinking about building a portable/indoor mag-loop antenna using aluminum flashing, because it is both cheaper and lighter than copper pipe and easier to bend / work with. Full Wave Loop Antenna Calculator. • To be a magnetic loop, the loop circumfrence must be less than 0. Limited space doesn't have to mean limited HAM radio performance. The station is over 150 miles away. Loop and pre-matching circuit Uses a ladder line as impedance transformer The length of the ladder line is approx. Most designs of active loop antenna use an amplifier with an input impedance in the region of 1 to 100 Ohms. I am basically looking for an omnidirectional 2 meter antenna with 6-8 dbi gain. All antennas discussed are made of wire, have a design frequency of 29 Mhz since this is where most of the AM activity occurs on 10 meters, and are shown with antenna patterns modeledusing EZNEC, with the antenna 30 feet above ground. The capacitor tunes the inductor to the AM frequency of interest so that it resonates and becomes a functioning antenna. I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. 4: Calculated antenna characteristics for the given copper loop (AA5TB calculator, ref. A tiger tail antenna is a short piece of wire you connect to the antenna post on your HT. about loop antenna calculators!!!) Fig. 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'. I am more concerned with noise reduction and maintaining at least the bi-directional quality of a loop antenna. The calculator yields a reasonable approximation of dimensions, to within 5% over the amateur bands, using typical wire gauges ranging from #12-18 AWG. My Loop Antenna November 20, 2013 15 Transmit Properties of Electrically-Small Loops •Small size achieved by virtue of construction •High efficiency achieved by proper loop design. We will see that a vertically polarized loop is really an array of. I am adding a modern aftermarket power antenna into my 1968 Firebird. Indeed there are two different types of loop antennas, The first of these is the ferrite bar as build into practically every portable radio, the other is wound on an air-core form, and is far less popular with radio. 1 Ohm, dependent on the loop's material and section L = 4 µH, Xl = 0,4 Ohm. Using this Cubical Quad Antenna Calculator, it appears that the length of your driven element targets 95MHz operation. N, increased. 96 –j1758 ohms, as determined. The impedance at the loop […]. Aim the “edge” of the loop toward the AM station you want to receive. Since closed loops are not subject to "end-effect" the calculated physical lengths with this formula are longer than corresponding dipole dimensions and are close to free space dimensions. If the target station is audible at all on the radio - it is a simple matter to put an external loop antenna nearby, and tune it until the weak station becomes strong. The length of a full-wave antenna is given by the formula 1005 / frequency in MHz = total length of the loop. The calculators for other antenna types such as parabolic,horn,dipole and patch are also mentioned. Within this physical description there are two very distinct antenna designs: the small loop (or magnetic loop) with a size much smaller than a wavelength, and the resonant loop antenna with a circumference approximately equal. This link is listed in our web site directory since Friday Nov 6 2015, and till today "AM Loop Antenna Calculator" has been followed for a total of 944 times. If your rig has a separate receive antenna input, checkout my antenna for you. ” They work for local VFH signals, but not much else. Use this online calculator to determine the length of a full-wave loop antenna from the frequency. DX Engineering receive antenna systems feature the best designs available for HF DXing, as well as for “AM DXing” on the MW Broadcast Band and for the Short Wave Listening bands (SWL). The component which can restrict a wide operating bandwidth is the choke balun. With this spreadsheet calculator we get the value of the radiation resistance. It is inversely proportional to the frequency which means the wave with higher frequency will have shorter wavelength. This warrants further investigation, but for now I am sticking with textbook expectations of an electrically small antenna such as the loop where 5%, while small, isn’t an unexpected value. Here's a circuit for a simple Loop set. Two formulas exist, and like the cases of square loops they do not produce the same results. Most of the tomes used by the last generation of AM consulting engineers date back to the 1940s and are no longer in print. 25 wavelength at the desired operating frequency. The antenna is resonate on both bands and does not require an antenna tuner. 30 metres of RG58CU has a capacitance of about 3000 pF, so with a pre-amp in the shack the highest frequency it could be tuned to was about 53 kHz. Because once you have either rolled, brazed, or soldered the main loop into a unit whole, there’s no easy way to change that. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. The effective diameter is approximately 5 feet. 5 feet length with 2 Pin Bare Wire, just plug it into the back of the stereo or radio. It's a great time to upgrade your home theater system with the largest selection at eBay. The main category is Antenna design calculators that is about Antenna design calculators. 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. Antenna Loop, Verona, Italia, VHF. _____ AM Loop Antenna Calculator UMR EMC Lab Formula Version 1, 7-8-2004 by Bruce Carter _____ Inserendo l'altezza e la larghezza del ciclo (36 o 48 pollici ciascuno se la costruzione di cui al precedente) e il numero di giri e la distanza tra una svolta (1 uso 0,5 nel mio disegno in modo modifiche che, se necessario) si otterrà la frequenza. Facebook Disqus Comments (0) Add comment. Propagation was not favorable on 17 and 12 meters immediately after construction when testing, but a good match was obtained on both bands. Check out the KI6GD Loop Calculator available for download here; it's very useful tool in figuring out what you need for a particular loop build:. The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. Object near or under the antenna will reduce the radiation resistance and increase the antenna capacitance. If you are going to use antenna this for 40 kHz JJY or 77. That is an example of a good multiturn loop calculator. KR1S Hoop Loop Ultralight Radio Antenna. The stock cap. It is observed that at lower frequencies, the impedance changes rapidly with frequency; a difficult feat of broadband performance is needed. The small loop antenna is almost ideal for DXing the crowded AM broadcast band and low frequency “tropical” bands. 144MHZ , 144 Mhz , 2 meter , Loop , Antenna - $47. _____ AM Loop Antenna Calculator UMR EMC Lab Formula Version 1, 7-8-2004 by Bruce Carter _____ Inserendo l'altezza e la larghezza del ciclo (36 o 48 pollici ciascuno se la costruzione di cui al precedente) e il numero di giri e la distanza tra una svolta (1 uso 0,5 nel mio disegno in modo modifiche che, se necessario) si otterrà la frequenza gamma del design dell'antenna. The loop will tune from 530 to 1710 kHz covering the whole band including the new expanded band. Instead of a ferrite AM loopstick antenna, I use a magnetic loop antenna, and I added an LM386 amplifier stage to drive an 8-ohm speaker. 22a Above is a screen shot from AA5TB’s spreadsheet for the same scenario. This is a 12 second recording of a part of a conversation (QSO) between amateur radio operators in the 20 meter band (14 MHz. Since closed loops are not subject to "end-effect" the calculated physical lengths with this formula are longer than corresponding dipole dimensions and are close to free space dimensions. The lower bands (80 and 40) want around 100 ohm, 30 and 20 want a 200 ohm feedpoint and 17 through 10 meters would be happiest with a 300 ohm feedpoint. EDIT: I've just looked at the original AM loop antenna, and it may actually be two or three windings of wire - rather than a single loop as I previously thought - but it can't be many - the wire used is quite thick - and the frame itself is very thin. My own (as in yet another) calculator for small-loop transmitting antennas functions differently from all others. Facebook Disqus Comments (0) Add comment. Limited Space Small Loop Antennas. Excellent AM loop antenna apply to most av stereo receiver home theater amplifier system tuner etc. I have checked the loop with my antenna analyzer , and actually it will cover 80 meter band from 3. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. 88 ft and 44 ft are popular lengths. Remember that the cell references will be invalidated. So, the loop diameter should not exceed about 1 mtr (≈3. An example on the use of the finite-difference time domain method to predict the performance of a strip loop placed upon a handheld transceiver case appears in Figure 5. The other antenna was made by Antenna Specialist who are still in business and may still produce the Super Scanner. My own (as in yet another) calculator for small-loop transmitting antennas functions differently from all others. 93 - Picnic Vertical Wire Antenna. A long-perimeter horizontal loop antenna normally is used as a multi-band device, otherwise a completely different one- or two-band antenna would be erected. You set frequency range with hula-loop diameter and 5K tuning potentiometer. KI6GD also appears to follow the ARRL formulas and therefore produces some incorrect results. Ferrite Rod Coil Calculator - 5. Choose from a wide range of antenna types, including single-band, dual-band, multi-band, vertical, trap vertical, wire, HF antennas. RF Engineering Training, also known as Radio Frequency Engineering, is a subset of electrical engineering that deals with devices which are designed to operate in the Radio Frequency spectrum: range of about 3 kHz up to 300 GHz. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. 30 metres of RG58CU has a capacitance of about 3000 pF, so with a pre-amp in the shack the highest frequency it could be tuned to was about 53 kHz. This 40 and 80 meter inverted V antenna is made with loading coils. for Horizontal Polarity CW or SSB use. The performance of this tuner was nothing short of spectacular on FM; the AM side was even more impressive, as it was designed to have an audio bandwidth of 20 Hz - 15 KHz -- the same as broadcast FM!. Magnetic Loop Calculator - IW5EDI Simone - Ham-Radio Small Transmitting Loop Antenna Calculator • 66pacific. There is a switch to select whether this amplifier should be used to power the speaker or whether crystal earphone listening is desired. Here is a great calculator for sorting out lengths, values, etc. LFA Yagi Antenna. BEAM HF 3 BAND X7 Cruscraft RP. Here is a photo of W2BRI with his 12 foot square magnetic loop antenna. We will see that a vertically polarized loop is really an array of. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. Usually, the 'antenna support rope' is smaller than the pulley support rope (the one in the tree). At indoor desktop antenna design is special tuning by two knobs without any problems and by use of two variable capacitors which works in similar way as standard Π unit. An AM loop antenna is one of the true marvels of electronics. 300W PEP = approximately 100W of power on SSB however 300W PEP on sideband will have the same peak voltage as 300W of carrier. The L (inductance) and C (capacitance) determine the resonant freq of the loops tank circuit. The loop is tuned with a variable 30-365 pF capacitor in parallel. EST (770) 614-7443 Phone (678) 731-7681 Fax E-Mail 312 Swanson Drive Suite B Lawrenceville, GA 30043. I am now using Version 3. Terminated Loop Basics The K9AY Loop is one of several published designs that use a terminated loop to get a directional pattern in a small space. In the first couple hours of having it up I was able to hear stations I could not hear before. Loop antennas are available in different shapes like circular, elliptical, rectangular, etc. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. If the doughnut is standing on the ground with its axis horizontal, there will be a null through its center (on its axis). As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. the loop using 'homebrew' construction, we also offer the AYL-M kit that includes a mast, wire and all the hardware needed to construct the antenna. Only the 432 MHz antenna is made from bare wire. About AM Loop Antenna Calculator The resource is currently listed in dxzone. The directional quality improves signal to noise ratio of the desired signal while rejecting signals perpendular to the plane of the windings. You lose a bit of performance and a lot of bandwidth (or a lot of performance and a bit of bandwidth) but one is still a good way to get onto a particular band. The AM antenna has 2 pin tin-plating twin lead bare wire to connect the AM antenna jack of stereo receiver audio video av receiver home theater amplifier system etc. This calculator is designed to give the critical information of a particular beam antenna, in this case a seven element Yagi, for the frequency chosen. There is also another form available to compute the. 8 shows the ferrite-core loop-antenna itself. Personally I look for the rare DX where I can find it, and work SSB exclusively right now. Listening antennas for Asia and Pacific Needed!. 64 wave lengths. Antenna analysis software by Roy Lewallen. PK’s Loops A-LOOP-TAM AM Loop Antenna Longtime readers of this website know I am a die-hard fan of loop antennas. • The calculators give you theoretical values, your actual construction will also affect the antenna greatly. Comparison of the 190' double extended zepp vs. For Base or Mobile use. RF Engineering Training, also known as Radio Frequency Engineering, is a subset of electrical engineering that deals with devices which are designed to operate in the Radio Frequency spectrum: range of about 3 kHz up to 300 GHz. There are many kinds of loops, ranging from simple, passive loops for AM/LW or SW reception to expensive amplified loops of both the tunable and broadband variety such as the Wellbrooks, Pixel, AOR, Belar and others. That will probably have to wait a long while since such an antenna is not in my plans for 2014. The loop will tune from 530 to 1710 kHz covering the whole band including the new expanded band. Though as someone commented last year, an active antenna may be simpler than a loop for receiving, at least forbmany uses. Rated 5 out of 5 by alf from cleared up the static ect. Dipole Inverted Vee Antenna Calculator Super J-Pole Antenna Calculator and Plans (Collinear Design) Quarter Wave Ground Plane Vertical 1/8 Thru Full Wave Antenna Calculator Cubical Quad Calculator Yagi 3+ Element with options Yagi Three Element G0KSC High Performance Yagi Plans Yagi Designs / Plans Yagi VHF & UHF Calculator Loop Calculator KA1FSB. 25 wavelength at the desired operating frequency. Mar 8, 2013 5:01 PM, By Doug Irwin CPBE DRB AMD. A Small, Portable HF Loop Antenna John Wagner, N8CD - September 2014 AA5TB's Loop Calculator spreadsheet. Loop antennas can work on other frequencies also but need some modification because of the frequency property differences. AM Broadcast Band Loop Antenna, Very Effective. I am now using Version 3. the loop using 'homebrew' construction, we also offer the AYL-M kit that includes a mast, wire and all the hardware needed to construct the antenna. You lose a bit of performance and a lot of bandwidth (or a lot of performance and a bit of bandwidth) but one is still a good way to get onto a particular band. Use our simple calculator to determine approximate dimensions of materials needed to build a vertical antenna. If we have a loop like this with a high feedpoint resistance, over 10-20 ohms, the antenna has very high loss. The MESSUI Place. Simple receive only loop antenna constructed by Phil VK5SRP - Page 7 I have added 100uH RF chokes bypassed by 0. If the two JJY signals are of similar strength, resonate at 47-49 kHz, a. 000,- (3 Band) 10m/15m/20m Berat 28kg -----. Magnetic Loop Antennas By Jose B Rivera - N2LRB. The free end of that rope is tied off near the ground. The "loop" part of the antenna is the inductor, and the tuning capacitor makes it resonate at a desired frequency. The design consists of a balanced peaked lowpass coaxial design providing exceptional sensitivity and directivity. AM loop antennas AM loop antennas: AM Radio Loop Antenna: A Small Transmitting Loop Antenna for 14MHz and 21MHz By definition, the small transmitting loop is one which has a circumference less than one quarter of a wavelength. The performance of this tuner was nothing short of spectacular on FM; the AM side was even more impressive, as it was designed to have an audio bandwidth of 20 Hz - 15 KHz -- the same as broadcast FM!. RG-8 Length not critical. com AM Loop Antenna Calculator. I have made my own version of their calculator: AM Loop Antenna Calculator based on the UMR EMC formula Round Loops. (a) Perspective drawing of the proposed printed loop antenna integrated into a compact outdoor AP. I found a couple of web sites with a Loop Calculator. Figure 4 shows a theoretical two-element yagi designed for 75m (3. I’ve chosen to modify my build, preferring a double turn loop for 80, 60, 40M, with a switch to optionally use a single turn 40-10m loop like the Chameleon P-LOOP. There is also another form available to compute the. All these loops involve a resonant tuned circuit made up by a multi-turn loop coil and a variable capacitor. 94 - Laid-Back Quad Antenna for 80m. Build a portable crystal radio Click on photo for a larger picture The tangled mess of colored wires pictured above is a radio. This is an easy antenna to build and the materials cost about$15-20. Systems, inc. 30 your The KD7S loop-tuning capacitor used with a 3-foot-diameter loop antenna. 93 HP 4342A Utilities. Enter the length of the antenna conductor, which is the distance around the loop. 53m, $\lambda/4$, which is still unacceptable from size perspective. Within this physical description there are two distinct antenna types: The large self-resonant loop antenna has a circumference close to one wavelength of the operating frequency and so is resonant at that frequency. Propagation was not favorable on 17 and 12 meters immediately after construction when testing, but a good match was obtained on both bands. Its inception was predicated on allowing users to learn the basic concepts of loop design and construction. The antennas used for FM transmitters on my RF Circuits are just a short vertical section of wire, or you can use a telescopic whip antenna. Instructions are included below for building the antenna in an example for 147. Figure 4 shows a theoretical two-element yagi designed for 75m (3. Reference loop, 40-meter full wave loop 36-feet high over medium soil, opened opposite feedpoint to make reasonable feed impedance on 80 meters. The antenna Q is very high because the radiation resistance is small compared to the reactance of the loop and the VSWR bandwidth is very narrow. If you are using one of my designs shown on these pages, you are all set to go ahead. I have looked through many resources and calculators to find out how long my AM radio receiver antenna wire needs to be and I am confused at the conflicting information I am getting. Rated 5 out of 5 by alf from cleared up the static ect. Magnetic Loop Calculator v. find a coil calculator on web input wire gauge, number of turn s, form. The design is based on the principle known to all amateur radio operators that the most important part of a transmitting or receiving system is a good antenna and a well matched transmission line. Loop Antenna for AM Radio A loop antenna can greatly improve medium wave reception. The magnetic field will be perpendicular to the whole loop carrying the current. A loop antenna is actually sensitive to the magnetic field and not the electric field (it is also called a magnetic. The example I loaded was the 3 foot ribbon cable loop, and with 9 turns on 0. Because of its small size, it is possibly an attractive proposition for someone with inadequate space to erect a larger. The loop is a great choice today because of the noise on LW/MW. A so-called random wire antenna is an end fed antenna. Horizontal positioning into a TRIANGLE shape, makes it a DELTA loop, If you put it into a square, or rectangle shape, you have a BOX loop antenna. If you live near an AM or FM broadcast station, or close to a commercial installation, you should check to make sure you do not have BCI. 88 ft and 44 ft are popular lengths. The average power at the antenna: In watts The antenna gain in dBi: Enter 2. If your ferrite loop antenna has three or more wires going to it, you are not going to be able to directly substitute your loop antenna. You never see ADF antennas on airplanes for 3. For 160 meters a full wave loop antenna resonant at 1. The loop is tuned with a variable 30-365 pF capacitor in parallel. The half-wave dipole is very simple to construct. Mounted atop a Scorpion 680, the antenna can be tuned from 80 through 17 meters. Sep 12, 2011 - 1, Log Periodic Calculations for Equations in the ARRL Antenna Book, 22nd to begin designing a Log Periodic Antenna using this calculator. Such antennas are widely used in pagers, too. •Small loop antenna can produce a signal-to-noise ratio that is oftentimes better than a dipole for the same band. The antenna tunes from 10 through 20 meters and is rated for 100 W input. 75 MHz: (click to view full-size version) In the dipole example, the azimuthal pattern when viewed from overhead is nearly omni-directional. Comparison of the 190' double extended zepp vs. One of the authors of an out of print book called "Magnetic Loop Antenna: Slightly Different Each Time" has a website with some key maths and an online calculator. 88 ft and 44 ft are popular lengths. Excellent AM loop antenna apply to most av stereo receiver home theater amplifier system tuner etc. Long-wire antennas and arrays ultimately rest on the basic performance properties of a single end-fed long wire. I have made my own version of their calculator: AM Loop Antenna Calculator based on the UMR EMC formula Round Loops. Generating the Correct Antenna Pattern - Optimum Height The correct antenna pattern, shown in Figure 1, is surprisingly easy to generate. I started over with a square loop in Al made from DIY. (I think I may even have the same identical radio you have. This all caused higher efficiency on all bands, especially on 40M band which was missing in the 3th version of UltraLight MLA. That is why motor driven tuning capacitors are necessary. 30 your The KD7S loop-tuning capacitor used with a 3-foot-diameter loop antenna. The radio is a Fairbanks Morse that my dad bought new in 1936, when he was a teenager. 55 simplex would be: 1005/146. Loop Antenna Fields. PK's Loop Antennas bring clear & long range AM radio reception for homes and commercial use. As you may remember, back in May, I picked up a beautiful home-made loop antenna. The L (inductance) and C (capacitance) determine the resonant freq of the loops tank circuit. 0 out of 5 based on 7 reviews. zip HF wire ant & trans line design v1. Already you have scored a home run. This is in order to maximise the signal to noise performance and help to maintain loop balance. I also saw Tony VK3CAT's AlexLoop and thought it would be fun to try and make my own as an interesting alternative antenna for SOTA. In fact, they differ by almost a factor of 2. Calculator Antenna Duplex Feed Lines Fiberglass tubing Phased Array Projects Homebrew Software Antenna Antennas LOOP : Variation on the Shielded-Loop AM Antenna: VHF Antenna in a Lunchbox The Magnetic Loop on Two: The K9AY loop antenna for 160 and 80m bands, ON7EQ. Variables are number of loops, wire spacing, and variable capacitance range. Cut each of the 8 elements into two equal parts, Now lay all 16 elements out in a circle ( so they almost touch at the center, leaving a 1 -2 mm center hole). Built using cheap 4 pair (8 wire) telephone 'ribbon' cable,&; (optionally) housed in cheap garden 13mm (~half inch) irrigation plastic hose. This post highlights some of the technical and intellectual property points concerning the Loop Fed Array (LFA) high performance Yagi-Uda antenna designs created by Justin Johnson (G0KSC)[1] and his computer technique using NEC and self-refining Particle Swarm Optimization and other Genetic Algorithm techniques. MLA-M Magnetic Loop Antenna.