I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. Welcome to the G6OHM Website - Antenna Designs - Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites,Card Making, Recipes,BNOS,Flowerpot Antenna, Angela's Page,EXPMR Radio,Raised Bed Gardeningsion,Fusion Radio. We all know that VHF antennas are vulnerable. If the length of the conductor is a certain ratio or multiple of the. This is the newest way the cutting edge designers are looking at Ham R. Quick Link to Calculators. The 2MAX and 4MAX antennas are basically loop designs. com offers 39 vhf loop antenna products. The most fascinating subject within Amateur Radio has to be Antennas. The loop antenna comes in an amazing number of configurations. Currently, the best vhf marine antenna is the Shakespeare Galaxy 5225XT. Active loop antenna for HF I've got an ever increasing noise floor at my QTH so I thought I would try an active HF loop to see if I can null out the worst of the noise. It worked as expected and now I receive both channels without issue on the TV furthest from the antennas. DIY TV Antennas. With this antenna, you can experiment and learn, while making many contacts. We've compiled a list of what we think are the Best Outdoor HDTV Antennas of 2018. by Graham Maynard. AntennaJunkies. Indoor VHF Antennas. These antennas are great for expanding your wireless network and improving your broadcasting or receiving stations. 569-in), 18. gain design is the reason that array type antennas are more often used in the higher frequencies rather than a simple dipole. 38 minutes ago · 2. more Mobile HF Antenna Codan 9350. ClearStream 4-Loop Outdoor HDTV Antenna receives free HD 1080 programming from TV networks such as ABC, PBS, CBS, FOX, etc. If your antenna specification says 6 dBd, it provides main lobe gain 4X that of a dipole antenna. Calderon (DU1ANV) Makiling Amateur Radio Society (MARS) Before indulging directly to the design of VHF collinear antennas, it is worthwhile to review our antenna theory and practice of antenna home brewing. The range is a theoretical optimum, actual range is less due to transmitter power, receiver sensitivity, antenna cable losses and efficiency of the antennas. · Loop Antenna. The lower-band antenna looks like a large object to the higher-band antenna - "large" in terms of the wavelength, that is - and will seriously disturb its performance. Shop, read reviews, or ask questions about VHF Antennas at the official West Marine online store. The formula used to find a full wave loop antenna is 1005 / FMhz. All of our antennas are designed and manufactured in the UK and are renowned to be high in quality and performance; responsive in the most challenging environments. schemas/on6muvhf58verticalantenna. It is always a pleasure to peer into the working mind of another homebrewer and scrounger. One of these is a design for a fractal antenna. The recent third edition3, Antennas for All Applications, has significant additional information. Tame the predictable mast currents found in any j-pole antenna grounding conductive mast using a simple stub. Most often used with a parasitic loop direct or and a parasitic loop. Which choice is the best can vary based on your location. Click Here to see more on transmitting Loop Antennas from AA5TB. Cubical quad antenna basics Quad beam antenna with reflector & director 2 metre cubical quad design The cubical quad antenna lends itself to use at VHF and UHF, and a 2 metre quad or two meter quad is easy to make using a few items that are easy to obtain or may even be available anyway. Anyone making acursory investigation into the subject of -small antennas electrically exemplified by the magnetic loop antenna using the Google internet search engine will readily find an overwhelming and perplexing abundance of material. This design goal was achieved in the Pennyloop by having a second loop installed on the original feed point. It was based on an old antenna that they posted the measurements on the digital home Canada forums. And antennas for the new portable MH digital TV receivers are quite small – only 5 inches is needed for a quarter-wave antenna @ 600 MHz, right around channel 35. Antenna Arrays. The DF Loop is NOT a resonant antenna. Development of VHF Collinear Antennas, Matching and Feeding Techniques Jose I. A portable 2-element VHF yagi May, 1997 Here's a simple Saturday project: build a portable VHF yagi antenna for 2 meters. The formula used to find a full wave loop antenna is 1005 / FMhz. This is where products, such as the W2LI Magnetic Loop Antenna, enter the antenna arena. The 3-ring loop has about 12. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. From time to time we have written about the small transmitting loop antenna, sometimes called the magnetic loop because its radiation is generated only from its magnetic field (and not any electric field). schemas/on6muvhf58verticalantenna. 3 Printed Circuit Board (PCB) Magnetic Loop Antennas For VHF Operation. Welcome to the G6OHM Website - Antenna Designs - Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites,Card Making, Recipes,BNOS,Flowerpot Antenna, Angela's Page,EXPMR Radio,Raised Bed Gardeningsion,Fusion Radio. The two loop design broadens the SWR bandwidth and helps with impedance matching. The Zenith Indoor Passive VHF/UHF Antenna is HDTV The Zenith Indoor Passive VHF/UHF Antenna is HDTV compatible and provides 1080p or 720p programming. 00 BNC Connector Usable from 1 MHz to 600 MHz. Radio Amateur Radio Shop Hf Radio Qrp Ham Radio Antenna Electronics Projects Design Process Radio Activity Cabinet Making A brief overview and design process for a portable QRP magnetic loop transmitting antenna. It is used in extra-terrestrial. This information is primarily for the Amateur Radio two-meter band. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. The SA-008 COMM antenna is designed for installation in aircraft with larger vertical tails such as the Lancair IV, Glasair, Express and the many versions of Ex's. The overall gain improvement when. Gardner, Jr. The unique low profile design offers a solution for antenna restricted hams and short wave listeners. This chapter provides an overview of antenna radiation, antenna patterns, the symbols used to represent antennas, voltage standing wave ratio (VSWR), impedance, and various methods suitable for constructing wire antennas in the high-frequency (HF) and very high-frequency (VHF) regions of the spectrum. Wire-Beam Antenna for 80m 38 62. RDF Equipment Ideas for VHF Foxhunting and Radio-Orienteering. Can this antenna be miniaturized in any way?. This sketch shows a semi-exploded view of the antenna. This dipole antenna is a full half wavelength which provides the maximum aperture at this frequency. The PVC sections are held in square alignment by the use of a continuous length of sunlight resistant Polyester rope. 84 Comments While experimenting with a resonant loop antenna, he discovered that placing a static loop near the antenna tended to shape the signal away from an. The DF Loop is NOT a resonant antenna. A loop antenna is an antenna primarily for the AM broadcast and the Longwave bands. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. TM11-5820-667-12 states that a pair of PRC-25 (77) radios equipped with these antennas can expect ranges of 17 miles between them. There are a lot of antennas out there claiming to be designed for both VHF and UHF TV reception but perform miserably on the VHF signal frequencies. DIY TV Antennas. I am trying to design a loop antenna for operation at 2. There’s only one problem in my book; the PCB is covered in epoxy potting and you can’t see the design or repair/modify it! Something that I’ll have to fix!. With this antenna, you can experiment and learn, while making many contacts. Antenna Design. Loop Antenna John Stanley, K4ERO This horizontally polarized antenna is an extension of the horizontal loop antenna featured in The ARRL Antenna Book. A loop antenna is an antenna primarily for the AM broadcast and the Longwave bands. Until now, I only offered custom design and build services. Early halo antennas used two or more parallel loops, modeled after a 1943 patent which was a folded dipole bent into a circle. It provides several key advantages over traditional shortwave antennas that are much larger. The antenna current consumption is 150 mA. 8-shapped circular loop antenna in hfss at 145 mhz i m new 8-shapped vhf circular loop antenna How to draw circular arc in ADS layout and design loop. Experimental VHF Magnetic Loop Antenna for 2 Metre Amateur Band by John Winsor, April 2017. 2 Propagation and Coverage 14. Although "some" would consider it unconventional to build and use a Small Transmitting Loop (STL) on the VHF band of 6 meters, it actually serves a unique niche. The mclapp modified bowties are probably the best all around for capturing nearby VHF-HI and long distance UHF. If you prefer, apply RF to the antenna at this point and slide the toroids up and down until minimum SWR is found. Principally an impedance matching is not necessary. Antennas - Search by Platform Harris provides the electronics (RF front end and controls) behind the antenna, saving space and reducing weight on platforms while providing a cost-effective solution to our customers. This will be of interest when connecting the loop directly to the input of an field effect transistor (FET) head-amplifier. In general, I'm not really fond of magnetic loop antennas, but Peter has made his. For example, if the antenna. ) The UHF Model is 11 inches in circumference. All the basic construction details are included, and you can design an antenna for any frequency. HOMEMADE ELECTRONICAL CIRCUITS AND ANTENNAS homebrew projects Home made No frames supported page. As I was setting up my amateur radio station, one requirement was for 2M and 70cm antennas in two locations. Anyone making acursory investigation into the subject of -small antennas electrically exemplified by the magnetic loop antenna using the Google internet search engine will readily find an overwhelming and perplexing abundance of material. Hi-VHF 4-Element Yagi Antennas - based on Dave47's antenna, designed per K7MEM (DL6WU. 2 Home Made HIGH POWER Magnetic Loop. After much ado I settled on some plans I found on the web, added my own modifications & took some photos along the way. com is pleased to bring you this comprehensive one-stop-shopping list so you don't have to spend days or weeks researching. The dimensions and the wire wounds do not have strict tolerances. The above is a 4nec2 3D render of the antenna including reflector elements. Tame the predictable mast currents found in any j-pole antenna grounding conductive mast using a simple stub. Fig- 3: Normal design loop antenna. MA5B, Cushcraft’s multiband HF antenna provides 5-Band operation in a package small enough to mount to a tripod. SWR adjustment with a plastic screw at gamma match feed. Extended Double Zepp – Longer than a dipole. This is the third edition of the. (If ladder line, then there is no distinction between pin and shield. Wire versions are usually the answer. The mclapp modified bowties are probably the best all around for capturing nearby VHF-HI and long distance UHF. Parts list for the long yagi antenna RE-A50Y3. You may feed this antenna with a 4:1 balun. The antenna is aesthetic and has unobtrusive profile allowing it to blend in easily with any environment. The effects of salt water on vertical antenna performance designs in a series of articles called verticals by the sea. Now it's time to step it up (just a little bit) and fabricate a bigger antenna. It is always a pleasure to peer into the working mind of another homebrewer and scrounger. Here is a high performance radio receiver antenna amplifier for the entire VHF broadcast and PMR band (100-175. Antennas, Trans. Excellent off air reception of local analog and digital/hi-definition broadcast signals with 12 position fine tuning control for improved signal reception, adjustable VHF dipoles and pivoting UHF loop for increased signal reception. This page contain electronic circuits about Electronic Loop Antennas. Some TIPS on measuring VSWR and troubleshooting M2 … Antenna Gain: dBi vs. This chapter provides an overview of antenna radiation, antenna patterns, the symbols used to represent antennas, voltage standing wave ratio (VSWR), impedance, and various methods suitable for constructing wire antennas in the high-frequency (HF) and very high-frequency (VHF) regions of the spectrum. Every year since 1968, during the last weekend in July, the Central States VHF Society hosts an annual technical conference. It is displacement of the dual electrical/magnetic equilibrium that transfers energy, not a tangible flow, and this is why radio signals are almost all pervasive. Fig- 4: Modified design of loop antenna. The reason I built a loop antenna back in the 90s was because I had just moved into a property and did not have an outdoor antenna at the time. 1 It provides useful gain with very simple construction. 2 to 39 Wavelengths). It will not compete with a good high-gain directional antenna, but it sure beats rabbit ears. It was mounted so that the bottom of the loop was 2m above ground. It was replaced by an 8-element log period dipole array antenna described here. A remotely-tuned loop receiving antenna for LW and MW If your only knowledge of suburban Maryland comes from seeing the movie The Blair Witch Project, you probably think Maryland is a vast wilderness where it would be easy to pick up longwave broadcasts without interference. My guess is that your “rabbit ears” have the loop antenna as well (most do, or an snap on loop or butterfly). Full-wave loop antennas can be large at lower frequencies, but they are quieter than dipoles and have more gain broadside to the plane of the loop. Here is a great article on building your own 3 foot diameter loop from copper pipe that will fit in the attic of a single story home. Please be patient while I move some of the pages around and create a couple of new ones. The loop antenna comes in an amazing number of configurations. Its inspirations were derived from HCJB and W6SAI in his book All About Cubical Quads. New coax for masthead VHF antenna be a straight/smooth run without weird routing or loop-arounds. DEGEN DE31MS MW Shortwave Active Loop Antenna DE31 DEGEN 31MS is an active room magnetic antenna for MW&SW reception. The recent third edition3, Antennas for All Applications, has significant additional information. Check out this long-overlooked design that requires no antenna tuner. THE (VHF) DIPOLE ANTENNA At VHF and UHF, most antenna systems are derived from the dipole or its complement, the slot antenna. First, he is a Ham (albeit I have yet to find out what his callsign is). In general, I'm not really fond of magnetic loop antennas, but Peter has made his. If the loop is in the shape of square or large rectangle, the SWR can be below 2:1, but will not get much below 1. One night I saw two beer cans on my workbench, and they remember me at the Floating Solar Receiver by Renato Romero. com Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB Download Practical Antenna Design YAGI -UDA ANTENNA Model YG -23 Quad Rectangular or diamond shaped fullwave loop antenna. The impedance across the tuned loop at resonance is computed. I'd spent some time reading various articles describing the construction of magnetic loop antennas. Magnetic loop antennas are compact and can be moved around as needed. THE B3CKS VLF - ANTENNA PROJECT 15Hz-30kHz reception in grounded or floating mode by Torsten Heer - DKS302 - Germany. Antennas on the market today come in all shapes and sizes. Here are some helpful ideas to improve your success on the upper bands. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Although the Yagi/Corner-Reflector might not be the best antenna, it is the most common UHF TV antenna, mainly because it can be mounted on the front of a VHF antenna without degrading the VHF antenna. Excellent off air reception of local analog and digital/hi-definition broadcast signals with 12 position fine tuning control for improved signal reception, adjustable VHF dipoles and pivoting UHF loop for increased signal reception. This form of matching is more often seen in VHF than HF type antennas, but historically is well represented in VHF dipole configurations. Specifications. There are two days of technical presentations, antenna range gain measurements, noise figure measurements, a flea market, and often times a vendor area. National Radio Club Antenna Reference Manual Volume I [MWDX] National Radio Club Antenna Reference Manual Volume II [MWDX] National Radio Club Antenna Reference Manual Volume III [MWDX] National Radio Club Beverage and Longwire Antennas Design & Theory [MWDX] National Radio Club Loop Antennas Design & Theory [MWDX]. THE (VHF) DIPOLE ANTENNA At VHF and UHF, most antenna systems are derived from the dipole or its complement, the slot antenna. You are eligible for a full refund if no ShippingPass-eligible orders have been placed. The signal pattern from such antennas tends to be disk-like in a horizontal omnidirectional pattern, 360 degrees around the antenna. OCF Dipole Antenna for HF. The Zenith Indoor Passive VHF/UHF Antenna is HDTV The Zenith Indoor Passive VHF/UHF Antenna is HDTV compatible and provides 1080p or 720p programming. TVI fears have encouraged many people to shy away from the HF bands, in favour of VHF, UHF or 160 metres. For example, indoor "rabbit ears" usually need to be augmented with an additional "wire loop" or "bowtie" antenna (see images below) in order to pick up signals on UHF channels. 5" loop is representative of a large class of indoor antennas built around a loop or something similar. Many diagrams and illustrations. The antenna is the most common point of failure in a wireless design. Many antennas are based on half-wave dipoles fabricated from wire or tubing. The loop is mainly designed to pick up UHF. This index has a collection of Loop Antennas, that can be very useful for the enginner or the student who need a circuit / schematic for reference or information for a project that has to contain a Loop Antenna. FM and TV Antenna Selection and Installation Guide TV Translator Antenna Options, Listed By Performance Stellar Labs Deep Fringe Directional High VHF Band Antenna. D eciding to put up a loop antenna can be more of a logistical problem than an engineering problem in the initial phases of your project planning. by Al Peter, AC8GY. With the loop aerial, the signal pickup is much lower, and when the atmospheric noise level is low, the minimum discernible signal level can be set by the amplifier noise floor rather than the atmospheric noise level. THE (VHF) DIPOLE ANTENNA At VHF and UHF, most antenna systems are derived from the dipole or its complement, the slot antenna. With 100 watts out from the Icom, this was a great combo for 2m SSB work. 1 System Design Basics 14. At MVG, we design our antennas with outstanding performance in mind. I have edited this page for correctness. It worked as expected and now I receive both channels without issue on the TV furthest from the antennas. Several members of the Nashua Area Radio Club recently got together to help one of our members, Ralph N1UH, put up a 40m Delta Loop antenna. An Indoor HF Stealth Antenna. This is where products, such as the W2LI Magnetic Loop Antenna, enter the antenna arena. It has a nominal 3 dB gain over an isotropic source and is directional, tending to favor signals broadside to the wire. VHF-UHF Log Periodic Antenna VHF-UHF Log Periodic Antenna-North Yagi Antenna. 2 practical antenna design 140 -150 mhz vhf transceivers online edition elpidio latorilla ledf media. loop antennas, there are a few new ideas to grasp. These may include units with amplifiers or switched "tuning circuits", and frequently VHF rabbit ears are included. Specializing in Broadband HF/VHF Antennas & Masts/Towers. ) Conclusions. Basically there are 4 different kinds of loop antennas interesting to the amateur radio operator:. There are two basic types of antennas, directional antennas and omnidirectional antennas. This antenna also contains a pair of rabbit ears. 1 System Design Basics 14. 1 It provides useful gain with very simple construction. I have several VHF ground plane and discone antennas in my attic. 5-inches for 1/4-in Copper Tubing and 16. THIS IS A NEW CHAPTER ON MY WEB. However this is a tall order, as strong signal handling is the main issue with low noise amplifiers, especially when used in a broadband configuration in the presence of strong local signals (usually broadcast stations). One night I saw two beer cans on my workbench, and they remember me at the Floating Solar Receiver by Renato Romero. However, things have now changed. Design optimization and applications, Loop antenna characteristics • Get bearing then walk to source using VHF gear to get actual pole • Remote loop away. 5 MHz, and small transmitting antennas. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. VHF bands are difficult because the frequencies above 144 MHz are usually "line of sight"; meaning hills, trees, buildings, and whatever else there is between you and the receiving station has an affect of the antennas performance. Antenna projects for 144 MHz is a curation of 146 resources about , Feed line Dipole for 2 Meters, Simple VHF Antenna, Dish antenna for 2 meters band, OCF 2 Meter Sleeve Dipole Antenna, The Tiny 3. Here is a description:. It was a copper loop antenna with a capacitive fed gamma match. The ferrite loop is a unique design that provides repeated bearing accuracy. My workshop under the garage needed to have a separate antenna, preferably hung from a nearby tree. radio-astronomy. Dual-Band Sloper Antenna 39 63. The old system consisted of separate VHF and UHF antennas mounted on west gable with a mast-mounted preamp. If these factors can be overcome. The Patented Loop design of this antenna responds to a wide range of frequencies and also has a. A Word About Loop Antenna Design. This feature is not available right now. The antenna is a triangular loop antenna 2m (78") wide with a built-in low noise high dynamic range RF amplifier. Butterfly • Bowtie Antenna • Batwing Antenna Designer. There are two days of technical presentations, antenna range gain measurements, noise figure measurements, a flea market, and often times a vendor area. Will these antennas pick up VHF-Lo stations Channels 2 - 6 or FM radio? A. This antenna just performs. Comparing a Yagi/Corner-Reflector to an 8-Dipole-Reflector. A dipole is basically a length of conductor (wire) split into two portions and signal is taken off at the split. Includes element mounting corrections. The original Hi-Par came with a matching box built-on to the antenna (that's the box with the UHF/SO-239 connector on it). To my fellow low bands operators who have found the K3KY Flags and Pennants page useful, my heartfelt thanks. It is easily installed and highly recommended as an outstanding logistic solution for Outdoor as well as In-building installations. and it really impressive. This past week I built up a second VHF Loop antenna and tonight I installed it in the attic. SWR adjustment with a plastic screw at gamma match feed. So the conventional RFID antenna design at LF and HF bands is to use multiturn loop. Excellent off air reception of local analog and digital/hi-definition broadcast signals with 12 position fine tuning control for improved signal reception, adjustable VHF dipoles and pivoting UHF loop for increased signal reception. Here are the intimate details on the construction of wideband folded dipole VHF and UHF antenna arrays of a style popularized in Canada by Sinclair Radio Labs. We all owe a debt of gratitude to Earl Cunningham, K6SE (SK), for his outstanding work promoting these antennas. 2 Basic Antennas for VHF and UHF 15. Hello from Tommy in Arkansas, just took at your design John. Antenna was designed by Kent Britian, WA5VJB, and full credit (and blame) belongs to him on this design! This antenna is ideal for rovers, and is good for a fixed station on a budget. It is always a pleasure to peer into the working mind of another homebrewer and scrounger. The loop antenna comes in an amazing number of configurations. Obviously of shorter. Full Wave Loops. Related eBooks: Read Full Source. Receives UHF VHF and FM HD digital channels within a range of 25 miles and works with HD or analog TVs. Degen Designs has been around since 2001, starting in the amateur radio market offering a shrunken Quad Antenna called the BBQ101520. However, things have now changed. Small loops are used in radio direction finding, and in. uk) Even on VHF (2 m band), the size of standard antennas such as HB9CV and Quads can still be sizeable or akward for portable operation. This design is small, simple and relatively easy to "hide". Model FHL-VHF Guarantee No hassle refund If you are not completely satisfied with any ARROW ANTENNA Product it can be returned for a FULL refund less shipping and handling within 90 DAYS of purchase date. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. I had a problem with my packet radio station and decided that antenna gain was the solution. There is a lot of things which might destroy the antenna - wires, trees, birds, even its own mast. Full Wave Loops. 42, "The Loop Transmitting Antenna" (Technical Correspondence) - W5QJR. Enter the desired frequency and select the desired calculation from the drop box. This will be of interest when connecting the loop directly to the input of an field effect transistor (FET) head-amplifier. If the VHF signals you are trying to receive are much weaker than the UHF signals, installing the ClearStream 5 or VHF antenna at the top of the mast will usually achieve better results. 2 Propagation and Coverage 14. All the basic construction details are included, and you can design an antenna for any frequency. I just had a $300+ control module in my truck fail because *one* electrolytic capacitor leaked electrolyte all over the board and corroded a bunch of. Signal strength from distant VHF repeaters does not seem to be affected even when the roof is wet. More recent halo antennas have tended to use a single conductor fed with a gamma match. Topics Related to Antenna Theory. I have been experimenting with small (generally less then 1/10 wavelength circumference) transmitting loop antennas in the HF bands since the 1980's. Receiving Field HF Loop Antenna. Here are the original low-noise Loop Fed Array mono-band beams or Optimized Wideband Arrays for VHF and UHF. Fig- 3: Normal design loop antenna. How to Make the Ultimate AM Antenna. Philips Indoor TV Antenna, Modern Loop with 15 inch Extendable Dipoles, Tabletop TV Antenna, Digital HDTV Antenna, Smart TV, 4K 1080P VHF UHF, Compact Design, 4Ft Coaxial Cable, Black, SDV7114A/27 $10. Moonraker Antennas are a designer and manufacturer of complex antenna systems covering MF, HF, VHF and UHF, aerials, antennas, GMDSS, HF radio communications,. There is a lot of things which might destroy the antenna - wires, trees, birds, even its own mast. "This is the long awaited Chameleon F-LOOP vs Chameleon P-LOOP review. Antenna Definitions. Here is a great article on building your own 3 foot diameter loop from copper pipe that will fit in the attic of a single story home. I would like to build a loop antenna for 10 meter but i dont know how to calculate the measurements for it John, hope you could help me. DIY TV Antennas. Cubical quad antenna basics Quad beam antenna with reflector & director 2 metre cubical quad design The cubical quad antenna lends itself to use at VHF and UHF, and a 2 metre quad or two meter quad is easy to make using a few items that are easy to obtain or may even be available anyway. The "rabbit ear" antenna is one of the few electronic designs that your grandparents might still recognize from their past. It can provide high gain on a single band or moderate gain on multiple bands. It worked as expected and now I receive both channels without issue on the TV furthest from the antennas. This page contain electronic circuits about Electronic Loop Antennas. The loop antenna and receiver may be hand held or mast mounted. (The loop element has a width of 30-5/8-inch, measured from the outer walls of the outer element sections. 6 METERS ANTENNA · VE3SQB Ham radio antenna design software programs On vhf you can easily design a single feed 2 and 6 meter antenna. The main advantages of this 80 meter loop are the low takeoff angle on higher bands (good DX antenna) and the fact that it can be easily matched on 8 HF bands. Sounds complicated, but it really isn't. The antenna is a triangular loop antenna 2m (78") wide with a built-in low noise high dynamic range RF amplifier. The first was a plastic film, often used in states such as Florida. The dipole worked pretty well as most resonant antennas do; however, after considering some other alternative wire designs I decided to try a full wave Delta Loop. •Need lots of room, keep them away from metal objects like heaters and ducts •Wire antennas can be run near the peak of the roof inside the attic, bent in odd shapes to match the space available. And one who has been selling the same basic design for many years now. After much ado I settled on some plans I found on the web, added my own modifications & took some photos along the way. org The … K6MYC on Antenna Testing. The main contests are the ARRL June VHF Contest, the ARRL January VHF Sweepstakes, the ARRL September VHF Contest and the CQ Worldwide VHF Contest in July. The circular loop is popular at low radio frequencies and may contain many turns of wire, resulting in a higher, more practical inductance. His antenna is an MFJ1788 magnetic loop antenna mounted inside his garage. An Indoor HF Stealth Antenna. 4; QST, June 1986 p. 5/8 antenna could have about 3. All the basic construction details are included, and you can design an antenna for any frequency. This new design is easy to match in any situation. Loop antennas can be very effective, even if you have limited space and a tight budget. Printed Circuit Board (PCB) Magnetic Loop Antennas For VHF Operation. While this loop antenna will not outperform a yagi or a 4 square, it is a decent all-around antenna. apparentlyapparel. Antenna Measurements. Most people come into the hobby with a Technician Class license and can only work VHF. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Basically there are 4 different kinds of loop antennas interesting to the amateur radio operator:. Then coupled together, 90 degrees out of phase over a horizontal circular reflector. HF Antenna Design Notes. For example, indoor "rabbit ears" usually need to be augmented with an additional "wire loop" or "bowtie" antenna (see images below) in order to pick up signals on UHF channels. We have two Creative Design CLP5130-1N log periodic antennas in service, one north and one south. The most common material for home building small ham radio loop antennas is common copper plumbing pipe. The main problem of most antennas (as well as the matching system) for this band is the ability to achieve a low VSWR over a wide bandwidth while maintaining a high gain. One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. (If ladder line, then there is no distinction between pin and shield. VHF/FM dipoles for expanded reception VHF/FM dipoles, commonly know as "rabbit ears", allow you to receive TV programs broadcast on the VHF spectrum and radio broadcast on the FM spectrum. Later on, around 1980, the walkie talkies went off the CB channels. 2 Basic Antennas for VHF and UHF 15. Its inception was predicated on allowing users to learn the basic concepts of loop design and construction. Unlike any other similar antennas on the market, the CHA F-LOOP 2. 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. ) ( An extended general discussion can be found at Loop Antennas. (If ladder line, then there is no distinction between pin and shield. Receiving Field HF Loop Antenna. I have started my design as shown in the pictures. The ferrite loop is a unique design that provides repeated bearing accuracy. I have several VHF ground plane and discone antennas in my attic. Tuned 1/4 wave elements are provided for improved High Band VHF, UHF and 800/1000 Mhz performance. TVI fears have encouraged many people to shy away from the HF bands, in favour of VHF, UHF or 160 metres. A number of forums have discussed, for example, the CM4228HD's usable Hi-VHF gain, and this comparison aims to establish just how significant that gain is. Loop antennas are relatively easy to build. Yagi Antenna.