Mag Loop Antenna Review

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. Magnetic Loop Antennas can easily communicate with stations over hundreds and thousands kilometer distant. There is a very detailed description of some antenna examples in the Active Antenna Amplifier technical documentation. 5 ft diameter loop for 40m vs the same conductor length in two turns with a diameter of 3. It is well known that whistler waves can scatter electrons in velocity space, which is relevant to radiation belts and possible remedial of energetic electrons produced by high. I haven't seen reviews, but this antenna is too expensive for me. He has the F Loop , the P Loop, and newer 2. Loop antenna calculators suggest that a loop of that size can be tune from 40 to 10 mtrs with a variable capacitor of 10-180 pF. Cannot stress how narrow-band this antenna is. There is a general lack of measured data comparing small transmitting loop antennas to some sort of standard antenna. An RF current carrying coil is given a single turn into a loop, can be used as an antenna called as loop antenna. This type of antenna is called a magnetic dipole antenna. A loop antenna is actually sensitive to the magnetic field and not the electric field (it is also called a magnetic loop). 3 band wire. · The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs - particularly for those with space and/or budget limitations. Finally, on the top in picture shown above, is welded a variable tuning capacitor, a butterfly capacitor (it's important to avoid sliding contacts in the perspective to use an ATU in the future, to avoid sparks due to the high voltage generated). The loop antenna element is constructed from 22mm high conductive copper pipe. 7m AMA 8 Loop to a 20ft marine whip and against predicted data for an optimized 20ft center loaded whip. 172), simplified by noting the magnetization and charge density. It is also the lowest cost high quality complete small magnetic loop antenna currently available, but quality is not compromised. While most wire antennas are sensitive to the electric field, the magnetic loop antenna is configured to reject the electric field and respond only to the magnetic field. Also standard is a no-mar clamp for affixing the antenna to a table or railing. A small current is transduced on the antenna and the reciever amplifies it and converts it to audio. The Mini-Kits EME234 HF Magnetic Loop Antenna module has been designed to be easy to install, and covers a usable wide frequency range from 0. The MLA-V (V as „veranda“ or a patio) is a new antenna of the series of magnetic loop antennas from the workshop of OK2ER. , amateur and professional markets, claimed to be a major technological breakthrough "rendering skyscraper antennas as archaic relics of the past". Mag loop vs. the antenna takes about 2 days to complete assembly. Walls tend to block or weaken the electrical component of the signal but their effect on the mangetic component is very little. 6-160M Base antennas, VHF UHF Beams, 6-80M Portable antennas. Shielded Active Broadband Magnetic Loop architecture provides enhanced noise rejection over standard antennas. The adapter mounts with the same 10-32 red thumbscrews that are used for the stabilizer feet. 2-1x1 meter and 70X70cm) Fractal shape make antenna much broader bandwidth up to 120 KHz on 10 meters band Easy tuning slow motion power dc motor with double gears electrically insulated Capacitor Butterfly type 7mm gap between plates make them up to 9KV insulation allowed use up to 400watts power Ridged design easy assembling with size suitable for portable installation also balcony or loft. in co pan in meds. what it's like to use this antenna without a lot of technical information. patented design. The antenna is built to last. The radiating wire was a 30…. by: Jenny List. I show some use cases for which this antenna is particularly suited. The loop is formed from 1. Tuning Meter. The Barrett 2018 Mobile magnetic loop HF antenna is an autotuning antenna consisting of a hinged arm (the loop) mounted to an aluminum vehicle roof rack. Great for travel!. LW, MW and 160- m Antennas. W5KV Ham Member QRZ Page Greetings Radio Ops, Presenting the PreciseRF HG-1 Magnetic Loop Antenna by W1RMS. K30 Magnet Mount CB Antenna - 35". The Small 3 foot diameter loop is naturally stealthy for HOA challenges and a perfect complement for vertical and small wire transmit antennas. 15 ANNA UNIVERSITY CHENNAI : : CHENNAI – 600 025 AFFILIATED INSTITUTIONS B. kanga-products. Pixel Technologies RF PRO-1 By Ned Mountain, WC4X 5/1/2010. In general, I'm not really fond of magnetic loop antennas, but Peter has made his work. The primary is the small inner loop that is 1/5 of the size of the main loop. (Bob) Leschyna. Check Best Price Hustler / New-Tronics Antenna Corp. 3 MHz to 29. 1: Calculator results for a loop with a diameter of 1 m (3. Loop antennas for outstanding directional radio listening and reception monitoring of medium wave, long wave, short wave and HF DX. The ease of a magnetic installation without sacrificing performance at 58" tall. The Mini-Kits EME234 HF Magnetic Loop Antenna module has been designed to be easy to install, and covers a usable wide frequency range from 0. This article provides all the details needed to build your own. 2-1x1 meter and 70X70cm) Fractal shape make antenna much broader bandwidth up to 120 KHz on 10 meters band Easy tuning slow motion power dc motor with double gears electrically insulated Capacitor Butterfly type 7mm gap between plates make them up to 9KV insulation allowed use up to 400watts power Ridged design easy assembling with size suitable for portable installation also balcony or loft. This entry was posted in Antennas, News, Shortwave Radio and tagged Mag Loop Antennas, Magnetic Loop Antennas, MLA-30 on September 17, 2019 by Thomas. in diameter at the same height (about 12 feet) be a significant improvement?. To counter this I have been looking at magnetic loop antennas (magloop). As with any loop antenna they are directional. I haven't seen reviews, but this antenna is too expensive for me. The video provides lots of info about the antenna. Multipole moments are given by (9. 20 Meter Circular Magnetic Loop by IW6DFW. A new antenna was in order if we wanted to continue to enjoy 6 meters, which has many different propagation opportunities. Loop Base Gsm Omni Whip 3db Terminal Magnetic Antenna , Find Complete Details about Loop Base Gsm Omni Whip 3db Terminal Magnetic Antenna,Magnetic Loop Base Antenna,Gsm Omni Whip Magnetic Antenna,3db Terminal Magnetic Base Antenna from Communication Antenna Supplier or Manufacturer-Shenzhen Hongsense Technology Co. EB3FFP Marc - Spain - Midi loop. It can be used to build a tuner box by using a 3D printer. The best source I've found is a cell phone company. Enter stage right - Chameleon's P-Loop 2. Have you ever wondered where different modes should be operated, what frequencies to avoid as a courtesy like SSTV etc?. I have looked all over the internet to try to find drawings on how to build a magnetic loop antenna that will cover at least 40-10 meters I know mfj makes one but you must understand when you live on 751. Portable Magnetic Loop Antennas Ham Radio's Best Kept Secret Eric Norris WD6DBM v2. Check Best Price Hustler / New-Tronics Antenna Corp. 0 In the effort of improving my ultra-portable HF antenna setup, I first looked into a Capacitively Coupled Magnetic Loop , better known as the Army Loop (or Patterson Loop). It is safe enough a foot or two away from the operator. i can tune the mag loop antenna to get max sound and I hear stations well. Tuning the Alpha Loop is critical but easy. Testing was performed on 20 meters WSPR by sending 3 frames on each antenna starting at 7PM local time. The magnetic loop is different from typical antennas because it emphasizes the magnetic part of the radio wave (H field) rather than the electric part (E field) of the radio wave. Besides, as a MagLoop Insider, should you decide to purchase one, if your email has been on file with me, you will qualify for a meaningful discount coupon. The overall consensus from the reviews was that it worked decently for the price, but of course could never live up to the high end loops that cost hundreds of dollars. K40 Magnet CB Antenna. 5mm, the Unifier GGBLA. To achieve this smaller breakdown size, and to make the magnetic loop easier to assemble, is the telescopic mast. Field trials of the CHA F-LOOP 2. The directional loop design in combination with the receiver's high pass filtering, greatly reduces unwanted noise and hum. The magnetic field will be perpendicular to the whole loop carrying the current. It is designed for portability, and can be assembled or disassembled in about a minute. The radiating wire was a 30…. There is a general lack of measured data comparing small transmitting loop antennas to some sort of standard antenna. ) Wellbrook Communications (links to reviews are found on the bottom of this page) Wellbrook ALA-1530 Active Magnetic Loop Antenna Product Reviews Wellbrook ALA-330 active magnetic loop antenna Product. The antenna consist from two loops 1 meter in diameter. The Magnetic Loop antenna works with the magnetic component of the signal. Otherwise a typical 1m diameter loop will become self-resonant below 30MHz and / or the excessive loop inductance will result in the reactive part of the loop impedance. The adapter mounts with the same 10-32 red thumbscrews that are used for the stabilizer feet. 0 Magnetic Loop Antenna. All Antennas, Magnetic Loops, Portable. I have been looking at these for years, and have always been fascinated by mag loops. Kaito AN200 antenna review AN 200 AM loop antenna and my story Loop antennas is one compact type of antennas that offers a high selectivity on a determined band. 0 was designed with portability, ease of use simplicity, ruggedness and high performance in mind. The magnetic loop design leads to antenna which is tuned to a very narrow frequency range, giving good selectivity. The overall consensus from the reviews was that it worked decently for the price, but of course could never live up to the high end loops that cost hundreds of dollars. Indoor Antenna Construction Tips. The ALA 1530 displays a relatively flat response in the frequency ranging from 500 kHz to 30 MHz and matches directly to the receiver without having to adjust the impedance. Being in a situation where I can't install any external antennas, I've been experimenting with a lot of different indoor antennas but was never really satisfied with the results. The loop is formed from 1. 0, and also makes the accessories compatible across both Loop antennas. A magnetic loop antenna is a winding of copper wire around a frame (for air-core loops) or around ferromagnetic material (for ferrite loops). Combining several specials (10% off first order and a 30% OFF sale from Chameleon) I was able to order this model for just a little over $250. Review Summary For : MFJ-1788 Super Hi-Q Loop; Reviews: 58 MSRP: 429. magnetic loop antennas. It’s their enhanced S/N ratio that makes these magnetic loops superior receiving antennas. W5KV Ham Member QRZ Page Greetings Radio Ops, Presenting the PreciseRF HG-1 Magnetic Loop Antenna by W1RMS. 2016/10/05 - Portable Magnetic Loop Antenna for 11 Metre 27Mhz CB Band - YouTube Stay safe and healthy. Finally, on the top in picture shown above, is welded a variable tuning capacitor, a butterfly capacitor (it's important to avoid sliding contacts in the perspective to use an ATU in the future, to avoid sparks due to the high voltage generated). Pixel Technologies RF PRO-1 By Ned Mountain, WC4X 5/1/2010. vertical magnetic loop antenna model The 4nec2 modeling program 1 contains a model of an 18-sided vertical magnetic loop with an 18-sided coupling loop in the sample file named "models\HFshort\ Magnetic. Today I tested out my new wonder loop antenna on the window sill inside my house using my Ft817ND,, The bands were pretty good today and decided to have a go in a contest on 10 metres, I found VE3PN operatng on 28. There are probably some discoveries to be made in the future with loop antenna research. How To Obtain A Ham License. 5 MHz 160cm x 120cm. For operation of the AMA loop antennas a DC voltage of 13. The controller uses a very low-power DDS oscillator to tune the loop so it will tune right through your amplifier. 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. The other is an interesting low-to-the-ground/limited space option. ; power divides between R rad and R loss. Tuning Meter. However, the. Unfortunately we do not offer such a cable at the moment. The antenna consist from two loops 1 meter in diameter. Hey, I am beginner at HFSS. The F-LOOP was designed with weight, durability, portability, versatility and cost in mind. i can tune the mag loop antenna to get max sound and I hear stations well. But what if one would like to receive (well, let's start looking at RX only at this point) on an additional frequency at the same band or maybe even in another band, such a simple magnetic loop antenna. I have only found a small bit of recent data [ 2 ] comparing an 1. Review of the MFJ-1835 Cobweb Antenna (#71) → Review of Chameleon P-Loop Magnetic Antenna (#70) Posted on May 29, 2017 by. Pixel RF PRO-1A & 1B Shortwave Magnetic Loop Antenna Product Reviews (Note: there are some significant changes between the earlier PRO-1A and 1B. I am a low profile radio amateur. These are manual tuners designed to tune small loop antennas, and are particularly useful for antenna restricted and/or portable operation. It is safe enough a foot or two away from the operator. A 145MHz 2m loop. Magnetic Loop Antenna - New Theory - Patent No GB 2285712. The Alexloop walkham loop, the Caras HF 315 loop, Alpha loop antennas and finally Chameleons CHA P loop antenna. Low-profile & modern pre-tuned magnetic antenna with an adjustable antenna angle. The AEA IsoLoop is a small loop transmitting antenna that covers 14 Mhz to 30 Mhz continuously tunable. MFJ-1786 Loop Antenna - My Stealth Antenna Installations. 0 In the effort of improving my ultra-portable HF antenna setup, I first looked into a Capacitively Coupled Magnetic Loop , better known as the Army Loop (or Patterson Loop). 2016/10/05 - Portable Magnetic Loop Antenna for 11 Metre 27Mhz CB Band - YouTube Stay safe and healthy. Hi is there any possibility to tune a magnetic loop ,made by Ciro Mazzoni with DDutil or directly by the USB port from my 6500. A New Homebrew Magnetic Receive Loop at VE1ZAC. Some antennas do this by enclosing the loop windings inside an aluminium tube. The Alex loop antenna is inside this bag ! 🙂 Before there were two versions of the AlexLoop (a kit using copper tube for the radiating element with the cost of $199 US. March 2011) Wideband Active Small Magnetic Loop Antenna (Last Rev. 5km Coverage Range Waterproof 14dBi WiFi Antenna Wireless Extender Repeater USB Adapter Signal Booster with Magnetic Loop Average rating: 0 out of 5 stars, based on 0 reviews Write a review Generic. Honey, I Shrunk the Antenna QST July 1993, pp. I haven't seen reviews, but this antenna is too expensive for me. ) The other and now definitive version is the so called “ WalkHam “, which uses stout coaxial cable (RG 213) for the main loop and comes ready built in its own custom made. 4 GHz loop antenna will only need to be about 12 centimeters in perimeter. Antenna covers range: 13 MHz to 30MHz. It operates in three amateur short wavelength ranges of 20-40-80m (3. It seems one of the best kept secrets in the amateur radio community is how well a small diminutive magnetic loop antenna can really perform in practice compared with large traditional HF antennas. This magnetic loop antenna was used indoors on 7, 10 and 14 Mhz. 7 MHz (80 - 10 meter ham bands)!. When I saw a video of the new F-Loop 2. However, you will find that a basic "resonant" dipole will out perform a magnetic loop, you will also find that a decent mag loop will need re-tuning every 10/20KHz. Low-profile & modern pre-tuned magnetic antenna with an adjustable antenna angle. It is a great complement to vertical or wire transmit antennas. For more information contact: https://www. At only 18 inches, and 1½ pounds, it’s an excellent choice for restricted space and portable field operations. W6LVP amplified receive-only magnetic loop antenna (boy is that mouthful): The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs - particularly for those with space and/or budget limitations. This loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts. LW, MW and 160- m Antennas. I also have a shielded magnetic loop antenna. No installation is needed: you can put THE STEALTH LOOP on the ground, on a balcony, on a table, on the roof of your stationary car, etc. To begin with I shopped around for a loop antenna and looked at the following brands. If you decide to feed your loop with coax, I'd suggest using RG-8X or RG-213 and a high power, high performance 1:1 or 4:1 Current-type balun. August 2013) Wideband Active Small Magnetic Loop Antenna. Please practice hand-washing and social distancing, and check out our resources for adapting to these times. It operates in three amateur short wavelength ranges of 20-40-80m (3. In spite of its high Q and sharp tuning characteristics, this type of antenna can perform quite well indoors. Apparently the non accessible area would exist out from the center point of the vertical antenna body on each side. 48 + AU $468. genuine sony am / mw / lw loop aerial antenna. Saw a brief writeup on the YouLoop Passive Magnetic Loop Antenna that recently became available. 6pf, and around a 50% efficiency. This is very similar to the latest P-LOOP 2. Magnetic loop antenna projects category is a curation of 149 web resources on , Magnetic Loop Antennas, CT1ETT Magnetic loop antenna, Magnetic Loop Antennas by M0UKD. I configured the magnetic loop antenna for operation between 15 and 20m. Ferrite Magnetic Antenna for the 160, 80 and 40- meter Bands. 2-1x1 meter and 70X70cm) Fractal shape make antenna much broader bandwidth up to 120 KHz on 10 meters band Easy tuning slow motion power dc motor with double gears electrically insulated Capacitor Butterfly type 7mm gap between plates make them up to 9KV insulation allowed use up to 400watts. The type and the size of the specific antenna depends from the sensitivity requirements and environmental restrictions. add your review MFJs tiny 36 inch diameter loop antenna lets you operate 10 through 30 MHz continuously -- including the WARC bands! Ideal for limited space -- apartments, small lots, motor homes, attics, or mobile homes. ; power divides between R rad and R loss. LNR is pleased to announce that the PAR EndfedZ line of wire antennas has been acquired by Vibroplex. The magnetic field will be perpendicular to the whole loop carrying the current. 7 MHz (60 - 10 meter ham bands)! The magnetic loop is different than typical antennas. Hey All, Looking for anyone who has had experience with either antenna. K40 Magnet CB Antenna. Post navigation ← C. It is a great complement to vertical or wire transmit antennas. 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. Shielded Active Broadband Magnetic Loop architecture provides enhanced noise rejection over standard antennas. Covering AM broadcast through 30 MHz and beyond, its superbly directive element and bullet-proof low-noise preamplifier dig out buried signals normally lost when using wire antennas. 0 demonstrated that an indoor magnetic loop antenna was only around one to two S-units lower, on both transmit and receive, than an outdoor full size quarter wave vertical antenna. 2016/10/05 - Portable Magnetic Loop Antenna for 11 Metre 27Mhz CB Band - YouTube Stay safe and healthy. Finally, on the top in picture shown above, is welded a variable tuning capacitor, a butterfly capacitor (it's important to avoid sliding contacts in the perspective to use an ATU in the future, to avoid sparks due to the high voltage generated). The Alpha Loop is a 10-40 Meter transmit/receive antenna, which handles 100 Watts PEP SSB, 50 Watts CW, and 25 Watts Digital. Taoglas have developed a unique ceramic miniature loop antenna series for GPS-GLONASS-GALILEO-BEIDOU applications. A magnetic loop antenna is a winding of copper wire around a frame (for air-core loops) or around ferromagnetic material (for ferrite loops). TOP QUALITY ENGINEERING AND RUGGED CONSTRUCTION - Enjoy the Citizens Band via Mosley antennas! Designed by engineers with over 120 years of practical engineering experience, backed by decades of antenna manufacturing skill. vertical magnetic loop antenna model The 4nec2 modeling program 1 contains a model of an 18-sided vertical magnetic loop with an 18-sided coupling loop in the sample file named "models\HFshort\ Magnetic. Description. uk or https://www. An RF current carrying coil is given a single turn into a loop, can be used as an antenna called as loop antenna. 10 thoughts on " David reviews and compares the MLA-30 magnetic loop antenna " Martin - G8JNJ September 21, 2019 at 11:43 am. The 2 meter full wave loop is so light, it can even be attached to most any non-conductive support with good tape. 167) and (9. Experimental Comparison of Small Wideband Magnetic Loops (Last Rev. It is a great complement to vertical or wire transmit antennas. The second column of numbers is a commercial loop for relative comparison. Copper Loop tunes 20,30 & 40m bands, and Smaller aluminium loop tunes 17m , 20, & 30m bands. Active Elements - working to improve accessibility for radio amateurs with disabilities Review of MFJ-1786 Magnetic Loop By Ian DJ0HF March 2013 Hi, my name is Ian, my callsign is DJ0HF/G3ULO and this is a review of the MFJ-1786 Magnetic Loop antenna for the Active-Elements web-site. February 9, 2017 Julian OH8STN DIY Antenna Projects, Ham Radio, Magnetic Loop Antenna 4. vertical antenna I'm starting to feel like my short HF vertical antenna (an MFJ 1795) is a bit constraining, especially on receive. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. I also tested an MFJ Hi-Q loop indoors and found it worked decently, especially when located next to my glass patio doors. Out of stock. even though the price tag may possibly seem high, it is possible to get your DEGEN DE31MS MW Shortwave Active Loop Antenna DE31 on. 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'. The loop comes with 4 machined, powder coated stabilizing feet that attach by custom locking thumb screws. 75mm² is sufficient. Mag loop vs. i can tune the mag loop antenna to get max sound and I hear stations well. The RF-PRO-1B® can be mounted to a pole, mast or any flat surface. Field topologies of magnetic loop antennas at oblique angles in vacuum We start by reviewing the field topologies of a tilted loop antenna in a uniform background field in vacuum sketched in Fig. net 21 September 2008. The assembly is then cemented at the feed point onto a magnetic mount for mobile use. You can use a full-wave loop on frequencies higher. NMO Magnet Mounts with Mini UHF. make offer - hlp6 6m halo loop antenna folded dipole unity gain small compact and easy to use MFJ-9232 HF QRP Mini Loop Antenna Tuner 25W Multi Band Transmitting System NEW £97. I also tested an MFJ Hi-Q loop indoors and found it worked decently, especially when located next to my glass patio doors. This loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts. In the meantime it has obtained acceptance, but has both a good and a bad reputation. Comparison of Electric Dipole Antennas and Magnetic Loop Antennas The excitation of whistler waves is a topic of great interest in space plasmas and laboratory plasmas. The nulls may or may not be useful for you. Healthy dinner recipes under 500 calories per mile 2 mile See more. An SO-239 connector on the smaller loop, which also consists of LMR-400, couples to your feeder. An RF current carrying coil is given a single turn into a loop, can be used as an antenna called as loop antenna. 5 MHz and Below. 060 - so the bandwidth will be very limited. WIKIPEDIA, The Last Word on Antenna Design z"Small loops have a poor efficiency and are mainly used as receiving antennas at. The small loop antenna does have a mostly magnetic response, very close to the antenna during transmission. 0 on YouTube, I immediately ordered this antenna. Loop antennas are primarily used to measure the magnetic field strength at lower frequencies. It is a great complement to vertical or wire transmit antennas. Finally, on the top in picture shown above, is welded a variable tuning capacitor, a butterfly capacitor (it's important to avoid sliding contacts in the perspective to use an ATU in the future, to avoid sparks due to the high voltage generated). air core loop) were to be used as a magnetic probe antenna assuming the loop was well balanced. I also tested an MFJ Hi-Q loop indoors and found it worked decently, especially when located next to my glass patio doors. 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. Finally, on the top in picture shown above, is welded a variable tuning capacitor, a butterfly capacitor (it's important to avoid sliding contacts in the perspective to use an ATU in the future, to avoid sparks due to the high voltage generated). Since its introduction in mid 2015, the HF-319 has become a popular antenna and is used in a variety of situations. The ease of a magnetic installation without sacrificing performance at 58" tall. Out of stock. So what I really needed was a "Steppir-like rotateable magnetic antenna" to reduce the near electric field. Keep in mind that an air gap of 1mm equates to a breakdown voltage of about 1KV, which can be encountered when as little as 20 watts is used. Most magnetic loops have the capacitor at the top of the main loop and the gamma match or matching loop at the bottom, this arrangement avoids running the feed-line through the center of the antenna. Ferrite Magnetic Antenna for the 160, 80 and 40- meter Bands. It is a great complement to vertical or wire transmit antennas. DX Engineering RF-PRO-1B® Active Magnetic Loop Antennas.  Like in the $250 or higher range. Physically unable to install or maintain an outdoor antenna, I was fortunate to discover the Alpha 10-40 Meter Magnetic Loop Antenna Not only is it lightweight and portable, but it works well indoors: I worked Ca,Id,Mi,Ma,Cuba,Mexico,Brazil,and Aruba using 5 watts output. Chameleon P-Loop 2. 0: Yes, you most definitely need an RFI choke to use a magnetic loop antenna, and a good one. The F-LOOP was designed with weight, durability, portability, versatility and cost in mind. The loop antenna element is constructed from 22mm high conductive copper pipe. Anyone tried MFJ's QRM eliminators ? 10. He recently sent me this writeup, and I found it interesting, so I asked him if I could post it here. A magnetic loop antenna may be the answer and they are not as difficult to build as you might think. Description. all metal rugged variable. 20 Meter Circular Magnetic Loop by IW6DFW. MagLoop, Founder & Owner. 34-35, 39 Three and a half to four foot loop antennas for several of the HF bands from 160- to 10-meters. The BABY loop at TOKYO Hamufea 2015 the first day, had been parked near the smoking area at the back hall, Hammer with a loop antenna. MagLoop, Founder & Owner. The build utilises the DIY Magnetic Loop Starter Kit from Chamaeleon Antenna. However, their signal to noise ratio far exceeds that of a dipole. If you are a radio amateur, you may be familiar with the magnetic loop antenna. MLA-30 Magnetic Loop Antenna Review and Comparison by David Day (N1DAY) In this review David compares the MLA-30 against a 30-ft ground loop and a Wellbrook ALA1530-LF. A 145MHz 2m loop.  There are a few options of which one of the best is a Magnetic Loop antenna. Combining several specials (10% off first order and a 30% OFF sale from Chameleon) I was able to order this model for just a little over $250. When using the antenna you must tune to the frequency or band of interest and then adjust the loop’s capacitor to tune the loop to the same frequency. As a result, in most cases a Mangetic Loop antenna will work a lot better indoors than a dipole. It can be used to build a tuner box by using a 3D printer. chamelon p-loop mag loop magnetic loop antenna portable antenna qrp antenna About Michael Martens A licensed amateur radio operator since 1999 and earning his Extra Class license in 2002, Michael is the Owner of KB9VBR antennas and regularly writes his blog on antennas, emergency communication, amateur radio technology, and operating. The objective of this article is to disseminate some practical. October 2013 (Edits Nov 26, 2013). The antenna can be used inside the house by suspending it with cord, heavy string, etc from the ceiling or attach it to a wall stud, the higher off the ground the better the performance. The actual loop tuner circuitry is identical in the three tuners. It can cover six HF amateur bands in one three-foot antenna, but the loop will also cover all the shortwave broadcast and utility bands in between as well. Active magnetic loop antenna Wellbrook Communicati. Included in shipment of the AMA magnetic loop antennas. Low-profile & modern pre-tuned magnetic antenna with an adjustable antenna angle. Magnetic Loop Antennas With Yaesu FT-817 QRP HF Marcus Jenkins; 27 videos; 8,032 views; Tuning a Magnetic Loop Antenna using an Arduino-controlled Vacuum Variable Capacitor - Dennis Brown, 6 Meter/50 MHZ Magnetic Loop 6M-F Review Magic Band Antenna by HamRadioConcepts. ance so that the loop antenna is seen as a cur-rent source. THE STEALTH LOOP is a small HF antenna with continuous coverage from 40 to 10 m. This version of the Alpha Loop has been designed to enable micro-tuning between the top outer and inner loops. View as Grid List. What is a magnetic loop? • Radio waves travel by a wave of electric and magnetic fields at 90 degrees to each other. patented design. Output is via a BNC jack. F-LOOP2 Portable Magnetic Loop Antenna. However, thanks to other hams like Steve AA5TB. net 21 September 2008. 2 Home Made HIGH POWER Magnetic Loop. 0 is Review of Chameleon P-Loop Magnetic Antenna CHA P-LOOP 2. Shielded Active Broadband Magnetic Loop architecture provides enhanced noise rejection over standard antennas. PK's Loop Antennas bring clear & long range AM radio reception for homes and commercial use. The Small Transmitting Loop Antenna-AKA-Magnetic Loop. lnrprecision. The "baby" with its controller looks like it can be integrated into an automatic station. High Performance DX when used with a low noise preamplifier. At the Mosley factory, trained, skilled personnel produce a full line of antennas made here in. There is no need to have special skills since these antennas usually are simple and small. 172), simplified by noting the magnetization and charge density. No installation is needed: you can put THE STEALTH LOOP on the ground, on a balcony, on a table, on the roof of your stationary car, etc. W6LVP loops cover 2200 through 10 meters (135 kHz through 30 MHz) with no tuning or adjustment. At this time it will be rockbound on 20 meters, centered around 14. Most receivers have a UHF noise figure somewhere in the range 3-10 dB, with 5 dB being typical. The "baby" with its controller looks like it can be integrated into an automatic station. You can Get special offers Terk Advantage Indoor AM Radio Loop Antenna with best price get it click Link!. Ferrite Magnetic Antennas by RN3DEK. When disassembled the antenna easily fits in a suitcase or backpack. 6 feet) transmission line included. The true gain for a loop antenna is what is shown in the net gain graph, not what the maker claims. Serway Chapter 33 Problem 50CP. Comparison of Electric Dipole Antennas and Magnetic Loop Antennas The excitation of whistler waves is a topic of great interest in space plasmas and laboratory plasmas. No antenna matching unit was necessary with a good match obtained on all three bands. You may find them to be excellent multiband antennas. Active HF Ffrequency Loop for Portable Scanner via eBay; Alpha Antennas Magnetic Loop. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. There is a folk wisdom, among amateur radio operators, that if you have a lot of noise on HF, such as in an urban location, then using a shielded magnetic loop antenna for receiving is really great for rejecting that noise. So what I really needed was a "Steppir-like rotateable magnetic antenna" to reduce the near electric field. Physically unable to install or maintain an outdoor antenna, I was fortunate to discover the Alpha 10-40 Meter Magnetic Loop Antenna Not only is it lightweight and portable, but it works well indoors: I worked Ca,Id,Mi,Ma,Cuba,Mexico,Brazil,and Aruba using 5 watts output. 4 GHz loop antenna will only need to be about 12 centimeters in perimeter. Receiving Field HF Loop Antenna. Such a field can serve as a reference standard for calibrating field-strength meters employing small receiving loop antennas in the frequency range 30 Hz to 30 MHz. DX Engineering RF-PRO-1B Active Magnetic Loop Antennas are designed for low-noise reception of signals within the frequency range of 100-kHz to 30-MHz. Mag loops couple to the H-component. I show some use cases for which this antenna is particularly suited. You can use a full-wave loop on frequencies higher. The moments are related to the multipole coefficients in (9. 0 demonstrated that an indoor magnetic loop antenna was only around one to two S-units lower, on both transmit and receive, than an outdoor full size quarter wave vertical antenna. 0 In the effort of improving my ultra-portable HF antenna setup, I first looked into a Capacitively Coupled Magnetic Loop , better known as the Army Loop (or Patterson Loop). 0: Yes, you most definitely need an RFI choke to use a magnetic loop antenna, and a good one. Therefore shielded loop antenna is an antenna that does not pick up the electric field component of the noise generated from the vicinity of the antenna. February 9, 2017 Julian OH8STN DIY Antenna Projects, Ham Radio, Magnetic Loop Antenna 4. A loop antenna is actually sensitive to the magnetic field and not the electric field (it is also called a magnetic loop). They provide exciting new capabilities to limited space operations with unparalleled reliability and dramatically higher power handling compared to other transmitting loops. I also have a shielded magnetic loop antenna. Here's one made from 1 inch copper tubing. Dave does a good job of explaining the theory and design behind this loop antenna, which shares some features of more expensive magnetic loop antennas from MFJ and other manufactures. A log-periodic dipole array consists of a number of dipole elements of different lengths in order to obtain a somewhat directional antenna having an extremely wide bandwidth. 5 MHz to 29. com is an archive of Rod/AC6V's webpages, and is no longer being updated. With these controls now on the control box and by using the optional LA400-RCK extension cables (see Options below), it is now possible to tune the antenna while the loop element is setup at the best location possible. First, I tried something simple. In general, I’m not really fond of magnetic loop antennas, but Peter has made his work. The antenna is tested in the field. NMO Magnet Mounts Other. 0: Yes, you most definitely need an RFI choke to use a magnetic loop antenna, and a good one. Unlike any other similar antennas on the market, the CHA F-LOOP 2. So I got a little time over the weekend to make some progress on my magnetic loop antenna. If you are a radio amateur, you may be familiar with the magnetic loop antenna. With 100W on 14 MHz the RF voltage across the capacitor should be 3500 V peak and the RF current in the loop 16. Yeah, but we got about five feet of more snow than we did last time, so if it's not one thing it's the other. Keeping in mind that magnetic loop antennas are compromise antennas, this one works surprisingly well. SMALL HF MAG-LOOP ANTENNA TUNER ( For 40m-17m Bands). Welcome to Efactorantennas. AOR LA400 MAGNETIC LOOP ANTENNA 10KHZ-500MHZ. The small size of these loop antennas has the advantage of convenience in handling, availability of a zero- response orientation, and a simple expression for the voltage produced by a given field strength. The nulls may or may not be useful for you. A great review of a ham Radio aerial that I have used many times. A current flowing into the coil radiates a near-field magnetic field that falls off with r-3. NMO Magnet Mounts with TNC. 3 band wire. For operation of the AMA loop antennas a DC voltage of 13. 2B: AA5TB calculator (Microsoft Excel file - if you don't have MS Excel on your PC, you can download a freeware viewer from Microsoft here) Ref. I have for sale 89. It is a great complement to vertical or wire transmit antennas. MFJ Magnetic Loops. The BABY loop at TOKYO Hamufea 2015 the first day, had been parked near the smoking area at the back hall, Hammer with a loop antenna. A horizontally polarized dipole by comparison would have two nulls off the ends of the antenna. 6 feet) transmission line included. The Magnetic Loop antenna works with the magnetic component of the signal. Comparison of Electric Dipole Antennas and Magnetic Loop Antennas The excitation of whistler waves is a topic of great interest in space plasmas and laboratory plasmas. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. Does anyone know whether the same remote control unit works for both models? In which case, I only need the MFJ-1788 loop and not a second remote control unit, which may save me some cost if I can source just the loop component. A magnetic loop antenna mostly receives the magnetic portion of the wave. 5 MHz 160cm x 120cm. patented design. 20 Meter Circular Magnetic Loop by IW6DFW. Magnetic Loop Antennas With Yaesu FT-817 QRP HF Marcus Jenkins; 27 videos; 8,032 views; Tuning a Magnetic Loop Antenna using an Arduino-controlled Vacuum Variable Capacitor - Dennis Brown, 6 Meter/50 MHZ Magnetic Loop 6M-F Review Magic Band Antenna by HamRadioConcepts. by Peter Parker VK3YE - first appeared in Amateur Radio, December 1997 October 1997's Novice Notes looked at compact antennas that amateurs use to operate from confined locations. But what if one would like to receive (well, let's start looking at RX only at this point) on an additional frequency at the same band or maybe even in another band, such a simple magnetic loop antenna. Walls tend to block or weaken the electrical component of the signal but their effect on the mangetic component is very little. So, a magnetic loop antenna may be preferable in city and suburban environments over other antennas like wires and miniwhips. Here is a photo of W2BRI with his 12 foot square magnetic loop antenna. NMO Magnet Mounts with PL-259. uk or https://www. G0CWT discovered that a 1/4 wave length circumference resonating transmitting loop has far better properties than common loop calculation programs found on Internet do suggest. This move is a positive for both companies and we are excited about the future going forward. W6LVP loops cover 2200 through 10 meters (135 kHz through 30 MHz) with no tuning or adjustment. by: Dan Maloney. TOP QUALITY ENGINEERING AND RUGGED CONSTRUCTION - Enjoy the Citizens Band via Mosley antennas! Designed by engineers with over 120 years of practical engineering experience, backed by decades of antenna manufacturing skill. 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. It’s different from most. This enables the Alpha Loop to be heard and be more Effective than any other manufactured loop. Mag Loop antenna Thank you very much for your reply, it was informative. A tripod option is now available. Being in a situation where I can't install any external antennas, I've been experimenting with a lot of different indoor antennas but was never really satisfied with the results. 10kHz-500MHz, Receive only magnetic loop antenna Download LA400 Brochure (909kB) LA400 options: MC-600 Impedance matching transformer brochure (161kB) GT-1 Galvanic isolation transformer brochure (606kB). Honey, I Shrunk the Antenna QST July 1993, pp. Most of the problems were related to ineffective RX antennas that were too sensitive to the surrounding noise, had excessive gain and lack the necessary linearity. The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor.  There are a few options of which one of the best is a Magnetic Loop antenna. Resources listed under Magnetic Loop Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. 7 MHz (80 - 10 meter ham bands)!. The construction of a simple magnetic loop antenna for 7MHz is described that does not require a tuning capacitor. Chiamaci +39 045 8903104. •Very low IMD, 30 dB Low-Noise Preamp insures good performance in both strong and weak signal environments •Up to 30 dB rejection of locally radiated noise compared to whip antennas. Active Elements - working to improve accessibility for radio amateurs with disabilities Review of MFJ-1786 Magnetic Loop By Ian DJ0HF March 2013 Hi, my name is Ian, my callsign is DJ0HF/G3ULO and this is a review of the MFJ-1786 Magnetic Loop antenna for the Active-Elements web-site. eHam reviews of the DoxyTronics Mag loop antenna; A preliminary review of the PK Loop C-LOOP-HDSW6-18. It is safe enough a foot or two away from the operator. However, thanks to other hams like Steve AA5TB. It is particularly useful for those that have antenna restrictions or limited space to install a full size HF receive antenna, or have very high man made noise levels. The Magnetic Loop antenna works with the magnetic component of the signal. 2 dbd on 432, this was verified at the Southeastern VHF Conference in. MFJ 1786 Magnetic Loop Amateur Ham Radio Antenna For SaleThe MFJ 1796 is a 36 inch diameter magneticloop antenna that lets you operate 10 through30 MHz continuously, including the WARC bands!It is ideal for limited space -- apartments, smalllots, motor homes, attics, or mobile homes -- orif you are limited by HOAs. This article provides all the details needed to build your own. Antenna Loop, Verona, Italia, VHF. Co Electronics Ltd. 1 MHz would need to be almost 66 feet in size for a half-wave antenna. ;-) 73 Paul. His antenna is an MFJ1788 magnetic loop antenna mounted inside his garage. 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. It seems one of the best kept secrets in the amateur radio community is how well a small diminutive magnetic loop antenna can really perform in practice compared with large traditional HF antennas. The Express Magnetic Loop Antenna (MLA) is a convenient, lightweight antenna, which can be deployed quickly and is ideal for use in places where HOA restrictions make full size wire antennas impossible, or where there just is not enough room to erect a conventional antenna. A follow up on the PK Loop C-LOOP-HDSW6-18 Antenna; eHam review of PKLoop LW antenna; SW only. This interesting feature makes the ground plane losses very low and generally this antenna has little dimensions. Textbook solution for Physics for Scientists and Engineers with Modern Physics… 10th Edition Raymond A. I was wondering if it was possible to remedy to the extremely high Q of magnetic loop antennas in the case of an analog modulation that requires more bandwidth than the Q can offer, and hence produces distortion) That is for transmission of course at very low power (so as not to breakdown the varicap) To explain it clearly : Imagine an FM modulated carrier. The Magnetic Loop responds primarily to the magnetic-field and this ensures high rejection of nearby electric-fields. Specialists in Broadband Loop Technology. May 8, 2017. 40 Comments. 5 MHz frequency, you would need a 12 foot diameter loop and a 215 pF capacitor to achieve a 40% radiation efficiency. More recently, the Wide - Bander has been developed. 060 - so the bandwidth will be very limited. If you were to scale our 1" tubing model to the 3. The antenna consist from two loops 1 meter in diameter. 5km Coverage Range Waterproof 14dBi WiFi Antenna Wireless Extender Repeater USB Adapter Signal Booster with Magnetic Loop Average rating: 0 out of 5 stars, based on 0 reviews Write a review Generic. 0 Mag-Loop Antenna, It's a little bit warmer today than it was for our last- Well, 35 degrees warmer than the last video. Description. It can cover six HF amateur bands in one three-foot antenna, but the loop will also cover all the shortwave broadcast and utility bands in between as well. Ideal for noisy environments where electric-field sensors like the mini-whip antennas are impracticable. Let me start by saying that I don't have the haughtiness to teach you the "who-knows-what" secrets of a perfect STL (Small Transmitting Loop) construction but that day I came across mag. 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. All of the reviews confirm the performance and ease of assembly of this magnetic loop antenna. i can tune the mag loop antenna to get max sound and I hear stations well. For mono-band QRSS, WSPR or WSJT activity this is not a problem at all. Apparently the non accessible area would exist out from the center point of the vertical antenna body on each side. The AlexLoop Premier is the new and further enhanced version of the original AlexLoop with special manufactured ULTRA LOW LOSS MONO BLOCK GOLD PLATED PL259 CONNECTORS. A 10 foot length of 5/16-inch copper tube gives a 39-inch diameter loop. MFJ-9420 and PSK? Anyone tried it? 11. At only 18 inches, and 1½ pounds, it’s an excellent choice for restricted space and portable field operations. 2 Introduction The DX Engineering rotatable DXE-RF-PRO-1B Active Magnetic Loop Antenna is designed for reception of signals over the range of 100 kHz to 30 MHz. Review Section 9. An axially symmetric field arises when the axis of the loop antenna is aligned along the uniform field B 0. 5 MHz and below are a special case. A New Homebrew Magnetic Receive Loop at VE1ZAC. K40 Magnet CB Antenna. 0, and also makes the accessories compatible across both Loop antennas. This entry was posted in Antennas, News, Shortwave Radio and tagged Mag Loop Antennas, Magnetic Loop Antennas, MLA-30 on September 17, 2019 by Thomas. 7 MHz (60 - 10 meter ham bands)! The magnetic loop is different than typical antennas. It is also the lowest cost high quality complete small magnetic loop antenna currently available, but quality is not compromised. Hey All, Looking for anyone who has had experience with either antenna. You've probably seen the MLA-30 Active Loop Antenna on Ebay. In the meantime it has obtained acceptance, but has both a good and a bad reputation.   It’s a good thing as one antenna can go any where between 20 meters and 10 meters – anywhere. magnetic loop antenna was only around one to two S-units lower, on both transmit and receive, than an outside full size quarter wave vertical antenna. Today, we’re highlighting the premier version of the world-famous AlexLoop Walkham Portable Magnetic Loop Antenna by Alex Grimberg, PY1AHD. At this point it's worth noting that the magnetic loop antenna is a resonant tuned circuit and the RF voltages across the capacitor and the RF current flowing through the loop should be very high if the losses are low. Between the big photo shoot (more pics to come, I promise!), post-production work, a class reunion, and Stanley Cup hockey, I haven't had nearly as much time in front of the radios as I would have liked. A New Magnetic Loop Concept The success of our award winning Airspy HF+ series brought us a lot of feedback from hundreds of customers and enthusiasts. No installation is needed: you can put THE STEALTH LOOP on the ground, on a balcony, on a table, on the roof of your stationary car, etc. · The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs - particularly for those with space and/or budget limitations. (I don't have a lot of technical expertise…sorry. 80 meter loop frequency plot The table above makes it fairly easy to choose the feedpoint impedance for the 80 meter loop antenna. My Magnetic Loop Antenna. Page 1 of 2 1 2 Next >. Am very weak on antenna theory, so let me please ask you experts out there. Some plumbing skills are required here as you will need to use a blow torch with plumbers solder paste and solder so do not attempt this part if you do not. MFJ Magnetic Loops. ; power divides between R rad and R loss. 10kHz-500MHz, Receive only magnetic loop antenna Download LA400 Brochure (909kB) LA400 options: MC-600 Impedance matching transformer brochure (161kB) GT-1 Galvanic isolation transformer brochure (606kB). QSO with my Magnetic Loop Antenna and my home-brew ATU with Arduino, IR and Encoder. 0 on YouTube, I immediately ordered this antenna. Experimental Comparison of Small Wideband Magnetic Loops (Last Rev. It is much smaller and therefore much cheaper than your Wellbrook, but it is a very quiet antenna. Would a magnetic loop ~8 ft. It provides several key advantages over traditional shortwave antennas that are much larger. Loop antenna calculators suggest that a loop of that size can be tune from 40 to 10 mtrs with a variable capacitor of 10-180 pF. air core loop) were to be used as a magnetic probe antenna assuming the loop was well balanced. The "baby" with its controller looks like it can be integrated into an automatic station. It is designed for portability, and can be assembled or disassembled in about a minute. vertical antenna I'm starting to feel like my short HF vertical antenna (an MFJ 1795) is a bit constraining, especially on receive. The assembly is then cemented at the feed point onto a magnetic mount for mobile use. They are solid, built to last and very much milspec and built in a state of the art manufacturing facility. The type and the size of the specific antenna depends from the sensitivity requirements and environmental restrictions. make offer - hlp6 6m halo loop antenna folded dipole unity gain small compact and easy to use MFJ-9232 HF QRP Mini Loop Antenna Tuner 25W Multi Band Transmitting System NEW £97. Review Of MFJ-1788 Mag Loop Antenna (#63) - YouTube This video reviews the MFJ-1788 magnetic loop antenna, which purports to cover 40 meters through 15 meters. You've probably seen the MLA-30 Active Loop Antenna on Ebay. GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. 0 In the effort of improving my ultra-portable HF antenna setup, I first looked into a Capacitively Coupled Magnetic Loop , better known as the Army Loop (or Patterson Loop). Field topologies of magnetic loop antennas at oblique angles in vacuum We start by reviewing the field topologies of a tilted loop antenna in a uniform background field in vacuum sketched in Fig. No antenna matching unit was necessary with a good match obtained on all three bands. COM G0BPS G4TPH Mag-Loop antenna How well did these well-packed magnetic loop antennas perform 60 SMALL IS GOOD – BIG IS BAD. NMO Magnet Mounts with 'N' Male. ;-) 73 Paul. A great review of a ham Radio aerial that I have used many times. 00 a month and you pay 300. The adapter mounts with the same 10-32 red thumbscrews that are used for the stabilizer feet. Unlike any other similar antennas on the market, the CHA F-LOOP 2. 5 MHz 160cm x 120cm. , amateur and professional markets, claimed to be a major technological breakthrough "rendering skyscraper antennas as archaic relics of the past". Re: Magnetic Loop Antenna Question On 11/13/2016 4:47 PM, Ken G Kopp wrote: > Two-way radio shops are another source of "hard-line" in short lengths. Thank for sharing John G4YDM. It's for indoor use and it's the best antenna I've used. I have been looking at these for years, and have always been fascinated by mag loops. I’ve worked Peter, VE3SO many times. An improved formula is derived for accurately computing the near-zone magnetic field of a small circular transmitting loop antenna. They are on the expensive side, but the other European-made product is even more pricey. They are solid, built to last and very much milspec and built in a state of the art manufacturing facility. Enter the MFJ-1786X - a small magnetic loop 6-band antenna continuously tuneable from 10MHz to 30MHz (30M to 10M). The best thing about these magnetic antennas is that they are very quiet, and electrical interference can’t affect them. Magnetic Loop Antennas for The Radio Operator with Limited Space pt. I have a MFJ-1786 magnetic loop antenna which covers 10-30 MHZ. It is easy to install and can work with different mobile CB radios, providing drivers with reliable communication while on the road. Constructing a loop that can generate sufficient signal levels, and then combining that with low-loss cable to preserve that signal all the way to the receiver, will provide superior performance to any antenna with a mast-mounted preamplifier, because the preamplifier itself will raise the noise floor, canceling some of the SNR improvement that. NMO Magnet Mounts with PL-259. Mag loop vs. However, they are both expensive and difficult to connect to a transceiver lacking a separate receive-antenna input. What is a magnetic loop? • Radio waves travel by a wave of electric and magnetic fields at 90 degrees to each other. 4 GHz loop antenna will only need to be about 12 centimeters in perimeter. W6LVP AMPLIFIED RECEIVE-ONLY Magnetic Loop Antenna - with T/R Switch - $345.
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