6 Meter Square Loop 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. Great antenna. It can also be modified to work on the FM portion of the 6-meter band by shortening the length of the 2 main elements a little at a time. The modeled Loop Fed Array delivers an. It is important to note that …. Inverted-V Beam Antenna for 30m 40 64. Right now I have about 60 meters of wire strung across my property and fed from a tuner. This model calculates greater antenna efficiency at 10 meters than at 20 meters with the loop circumference at 10 feet. 3 dBi! Physically the HO Loop is 29. The plan was to put up a one wavelength square loop for 20 meters in the diamond configuration, and a delta loop for 40 meters with a common feedpoint. and has a wind load of just 2 square feet. The inductor and capacitor values will compensate for the loss of length. However it’s hardly an event antennal, more suited to permanent installs. Post #222 Having built a series of verticals, inverted vees, half squares, and loops for my amateur radio activities, I decided to "thin the heard" of my less than successful antenna efforts and concentrate on a few antennas that have given me the most contacts and overall satisfaction. The idea of s circularly-polarized omnidirectional antenna is a bit hard for some folks to wrap their heads around, but they are quite common: Antennas used on GPS receivers are circularly-polarized and have a more-or-less hemispherical response so that they "see" the sky, but not as much of the ground. 40 METER LOOP ANTENNA. You never quite know when the band will open and where it will take you. The brass plate to hold them form an "L" 1-3/4" tall with a 1/2" lip. Issue, 56 February 1998. It uses #14 stranded hard-drawn copper wires to meet the requirements of the National Electrical Code and have the best radiation efficiency. I have no space on my city lot for a K9AY Loop or a Beverage antenna. Add you loop wire of choice and your coax cable for rig connection, and enjoy DXIt consists of: Custom designed Air core transformer using 14g stranded wire. Looking to find other HAM / CB radio operators on-line? You found us! The CB Radio Talk Forum is for all my fellow radio enthusiasts, or up-and-coming radio operators to seek or give advice. In other words to increase radiation resistance, the loop has to be made spatially larger. (cloud warmer) To calculate the length of wire needed for a Full Wave 11 Meter Loop Antenna, we divide 1005 by Frequency in Mhz, giving us the length in feet. > But I have the space for a 1 wavelength Square Loop or even a Bi-Square > Antenna for 20 meters. The gain is around 4 dBd on 40 mtrs, but it will seem much higher due to the very low angle, radiation pattern. Since I like to tinker and build things I thought building an antenna would be a good idea. Here I will only present the dimensions and information on how to build a 4 stack for 70cm. Ham radio antenna projects by Dave Tadlock. The first goal was to be able to talk to some of my friends on a 6 meter link that is within easy radio reach of my home. This is an antenna that has become the "standard" for competitive stations on 80 and 160 meters. After working three years with a homemade DL6WU type 6-element-antenna, I was intended to build something new as the old antenna decided to fall apart. The feedpoint of a full wave length (1 × λ) loop or cubical quad (QQ) has an characteristic impedance of approximately 115 Ω. In order to get an idea of the right place to start, certain formulas are generally accepted. K0FF's 6 -meter SLOOP. 7 in our example). Just like the two meter version, there are no moving parts and all materials can be easily obtained at a hardware store. 15 λ, installed 0. Schematic fig1. 00 each, add $5 for P&H. 40m-10m DELTA LOOP ANTENNA - GU3WHN The variety of one wave length loop shapes that can be deployed to suit the QTH. This had 4 x 2 inch coils in each corner of the loop with 30 turns of 1mm wire and I stretched the loop all around the garden and even inside the attic to make the loop as big as I could. Cross members of the 2 metre cubical quad antenna. One side of the antenna (wire) goes up the 11 meter fiberglass pole and from the top towards the house. As the late spring and summer months heat up, six meters comes alive. Like any antenna indoors, you have to use your imagination. A 6 meter version might almost fit in the attic. Each end of the loop was soldered to an SO-239 connector. Coupling Loop Configurations for Small Magnetic Loop Antennas. It shall be easy to adjust (i. "Welcome to the ARRL's portal for Amateur Radio technology! This page provides links to some of the technical facets of Amateur or "Ham" Radio. ANTENNA THEORY ANALYSIS AND DESIGN THIRD EDITION. They avoid the potential pitfalls of typical antennas and build the best, most reliable antenna systems for your amateur communication needs. > But I have the space for a 1 wavelength Square Loop or even a Bi-Square > Antenna for 20 meters. Printed Loop Antenna. murat aslan. Cable Corporation in Twinsburg, Ohio Ham Radio Above 50 MHz June1996 CQ VHF 25. Can be fed on anywhere along the loop. The loop described is just under 1 meter square. There will be a SWR meter, and an impedance meter. The delta loop was an average of 2 S-units worse. 65 for the example) and then take the square root. Full Size Quad Loop 2. The Half Square antenna is a great wire antenna for the DX edge. Wire Antenna Calculator. THE MOXON ADVANTAGE: A Moxon beam can be expected to provide approximately 5. It is designed for portability, and can be assembled or disassembled in about a minute. I also could not tell an audio or measured signal difference between the two feeds. It uses parasitic coupling between the 10 Meter dipole and the 6 Meter dipole to allow the antenna to work on 6 Meters. EZ Hang Square Shot Kit Choose Options Ni4L Delta Loop Full-Wave $0. The previous circular loop antenna example would have a diameter equal to 0. The following program will calculate the lengths needed to construct several popular wire antennas. VHF/UHF Antenna Mounting Ideas (for those of us without 120 foot towers). have the same radiation pattern as a short horizontal dipole, except that, unlike a horizontal dipole, a vertical loop is vertically polarized. The Moxon antenna is popular with amateur radio enthusiasts for its simplicity of construction. Dual-band Loop Antenna for 30m - 40m 37 61. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range. excluding VAT price is only valid for customers outside the EU zone. CALCULATION OF LOOP PARAMETERS EXAMPLE 1: Suppose a designer is constrained by PCB loop antenna dimensions of 34 mm x 12 mm. com Six Meter Monster Beam-- 8 element, 41 foot boom, 14. 0 dBi gain, By N6CA Six Metre Long-wire Aerial-- By Brian D. A standard "Mag Loop" STL antenna is a 1-turn air-core inductor. The larger the area of the loop the better it will work. Revised: June 6, 2007 I. This allows the antenna to be lowered and adjusted for maintenance and tuning. This reduction factor of around 1:10 means a loop sensitivity loss of around 1:10, but this can be partly compensated by increasing the number of turns. A single wire feed is the clue. ) capacitively shielded loop antenna that I developed for two meters. Constructed and designed primarily to be most efficient on the 6 meter band, this antenna will also tune all the way up to 20 meters with reasonably good results when used with an antenna tuner. 89 - Indoor Loop Antenna for 80m. This is an antenna that started out as a 2 element phased array, and grew up to be a 4 square in the Summer 2000 station rebuild. Lengths are given in feet, inches and fractions of inches, and in meters. The EA5AVL 40M Compact 4-Square Antenna was designed to provide excellent DX communications on the 40m band, utilising readily available components and be relatively easy to construct. "An Improved Feed network For Loop-Type Receiving Antennas" Unloaded PC boards for NCJ loop antenna $25. have the same radiation pattern as a short horizontal dipole, except that, unlike a horizontal dipole, a vertical loop is vertically polarized. This 2 element Yagi easily breaks down for portable operation. Mounting the 20 metre delta loop The balun is attached to the top of the house using Para-cord and a pulley, the cord is tied off on a cleat. An exceptionally well-made tutorial on how to build a simple delta loop antenna for the 6 meter Amateur Radio band. With this arrangement, the antenna will work well on all bands 40 through 10 but it will only works as a EDZ on ten. One of the greatest problems encountered when one likes DXing on the lower frequencies such as 1. Coupling Loop Configurations for Small Magnetic Loop Antennas. Loop antennas have always fascinated me. Change to get equal sides of 9’6”. In order to get an idea of the right place to start, certain formulas are generally accepted. I only had to lengthen the outer 5/8-inch diameter tube one time after erection to resonate the antenna at the 6-Meter design center frequency. 13 square meter in area. antenna ham radio. The antenna was a quad loop built from 2 fishing sticks, one was 6. If they are this poor in response to a query I wonder how they will be if/when you place an order with them? Perhaps you would not receive your antenna in time. A project log for HF Short loop antennas: managing expectations. I removed one of the two. I'm feeding the loop via RG-8 coax, about a 30' run. Â I have not done this. JA1OYY Mori's all band wire Yagi Home Made Antennas-JA1VKV Hide's 2el. One may view the far-field of a small loop antenna as dual to that of a small dipole antenna. Even though I might not build any of them, still opting for a full-sized delta loop, the exercise is useful in understanding what is gained or lost when attempting to squeeze a low-band antenna into a smaller space. EEE 171 Lab #6 2 The far-field electric and magnetic field of a dipole antenna is determined by integrating the fields for an infinitesimal dipole of length dz at a distance r from the antenna 2 jZI oo sindz dE q r q pl = (2) and 2 jI o sindz dH f r q pl =. The Quickie version to the below uses the common "T" adapter from the old coax cable PC networks, which can be found almost anywhere. Although my version of this loop is resonated for 90 meters, it has been helpful on the 75 meterband foreign broadcasters, too, such as RRI Pontianak on 3976. 5 in 17 ft, 11. It is easy to detect the change in background noise when rotating the antenna towards the sun. Free Online Engineering Calculator to find the Dimensions of a yagi Uda Antenna for a given Frequency Range and Length. A magnetic loop antenna for 160 to 15m - amateur radio construction projects. "Spring inside" yeppers, not really acting like a loop, tuned or un-tuned. The stub in the top leg of the antenna opens the loop when operating on 20 meters and selected other bands. Home Made Antennas-JA1YPA Contest Club's Home Made Antennas-JA2JSF Mac's Home Made Antenna-JA5CJZ Aki's 4el. A loop antenna will be resonant (with a purely real impedance) as the perimeter of the loop approaches one wavelength in size. 5 1996 N6LF discusses a simple way to broadband the classic half-square antenna to operate in both the CW and SSB "DX windows" on 80/75 meters. The possible exception is between 20 and 200 miles. Each leg is 1/2 wavelength (WL). Figure 1: EZ-NEC 3D Wire Model. If one is interested mostly only on 40 meter working, he can think of a loop antenna. A much better type of antenna then a simple quatre wave and that has more gain is the 1/2 wavelength vertical. A single wire feed is the clue. 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. 6 & 2 Meter Square Copper Dipoles: 6 Meter 5/8 Wave Vertical Antenna, G3JVL: 6 Meter rotable delta loop, KK5ID: 6 meterband klapstoelantenne: 6m Delta Loop antenna: 6m Deltaloop, PE1MWB: 6m-Half-wave-vertical, DK7ZB: 6 inches -15. antenna dipole fm new zealand. A few go further and show that the loop antenna imped-ance can be seen as a shorted transmission line. The 300 foot length of RG-6 for the north-south loop has been out there for over 20 years and it still works fine! At any rate, these loops are very cheap and easy to make and give me options when the station transmitting antenna is picking up more noise than I wish to tolerate. Ferrite loops. The simple calculator below uses the well-known standard formula for determining the total wire length in feet for a single element (single turn), full wave loop antenna, (length = 1005/MHz). For receiving on 80 meters it performs about the same as my 80 meter inverted Vee. 5 GHz, single polarized, included - standard 9V battery included. Previous attempts to create omnis have centered around shortening a half wave dipole and shaping it into a circle or square. It is very important to notice the dependence on Sr. Then measure an additional 3/4 wavelength, and create the second loop. And, the impedance and reactance are perfect! Below is a quarter wave ground plane antenna I made for 23cm, 1296MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box. Right now I have about 60 meters of wire strung across my property and fed from a tuner. 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. 6 Meter, "Magic Band" loop antenna Ham Radio Horizontal SSB six meters. Within this physical description there are two distinct antenna types. The experts at M2 Antennas know and understand radio propagation. A full-size Delta Loop, fed in the bottom corner, is a good low angle radiator and is great for working DX. I also could not tell an audio or measured signal difference between the two feeds. It should not be made more rectangular as the efficiency will suffer. Home; Portable QRP Ops; Morse Code; Operating; Mixed Media; NJQRP Skeeter Hunt; Suppliers. Yagi Home Made Antennas JA6HW Sumii's Home Made Tower and Antennas-JA8CMC Tastu's Home Made Antennas-JL8GFB Man's Home Made Antennas farm. Loop Antenna for 10m 35 59. In other words to increase radiation resistance, the loop has to be made spatially larger. Assembling the 20 Meter Antenna Matchbox For the popular 20 meter band, a suitable inductor can be made with 26 turns of enamel coated # 22 copper wire wound on a T80-2 toroid as pictured on the lower left. A project log for HF Short loop antennas: managing expectations. Click on Calculate and the optimum length for that combination will be displayed in feet, inches and fractions of inches, and in meters. One may view the far-field of a small loop antenna as dual to that of a small dipole antenna. Phase three was putting up a second loop; a dedicated 80m antenna. In the following dis- cussion, I depart slightly from the square. I was able to add about nine additional states and eight more countries. The "SQUARE"-Pole Antenna First off, I don't claim this to be an original idea here, in fact, what brought this back up was a roundtable conversation on 2 Meters during my last trip to Allentown, PA, and the station using the "SQUARE"-pole had grabbed the idea from an old antenna book, combined with the now-discontinued Cushcraft `Squalo' antenna. The magnetic > loop is a tiny antenna used primarily to null out strong, highly > localized single-point noise. 569-in), 18. 5 in 34 ft, 6 in 11 ft 5 in These dimensions assume you’re using bare wire. I prefer 31/2 feet high by 41/2 feet wide, sus- pended in the vertical plane, for convenience in my antenna's location. antenna wire extension cable female to male pigtail adapter sirius. Since I’m new to loops and the ARRL antenna book had very little info on actual designs, I needed an expert to answer. This article provides details needed to build your own. Some call it a Skywire Loop Antenna, some call it a W0MHS Loop Skywire Antenna, nowadays it's called a Full Wave Loop Antenna but it still is a force to be reckoned with. The formula used to find a full wave loop antenna is 1005 / FMhz. Below is a small (3" dia. For example, if one of the two. In a pinch, a 2 meter 5/8ʎmobile antenna can be used on 6 meters (I have!) 1/4ʎon 6 meters is 55. The circular and square loops of Figure 9-47. I have been giving thought to setting up a six meter antenna with horizontal polarization. In some ways the slot provides more flexibility because it enables the length of the loop to be altered to tune the 2 metre quad to exact electrical resonance. The antenna (integrated with a balun) has been inkjet-printed on a 3D-printed buoyant cone structure, which acts also as the system package to house the electronics and the battery. One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. Dave Hollander N7RK. Dick described a 6M Halo antenna that was built from the aluminum frame of a 'generic' lawn chair. I have been itching to get on 6 meters for years for many reasons. It is always a pleasure to peer into the working mind of another homebrewer and scrounger. There is a lot of leverage required to tilt this antenna. 160 Meters: 1. org The … K6MYC on Antenna Testing. The wire loop is now the correct length. Squalos are ideal for net-control, monitoring or as a general coverage antenna. Figure 6 U bolt assembly. In fact, the worst antenna from the point of view of parasitic coupling is the square quad loop. pedance of the loop antenna, other than to dem-onstrate that the impedance is dominated by a large series inductance and is a cascade of parallel and series resonances (6). Small Coaxial Loop 4. 6 & 2 Meter Square Copper Dipoles: 6 Meter 5/8 Wave Vertical Antenna, G3JVL: 6 Meter rotable delta loop, KK5ID: 6 meterband klapstoelantenne: 6m Delta Loop antenna: 6m Deltaloop, PE1MWB: 6m-Half-wave-vertical, DK7ZB: 6 inches -15. buick hum from antenna help. Topic: Antennas for 6 Meters? (Read 13887 times) About 10 years ago I bought a KU4AB square loop antenna for 6M local work. While that setup produced results on 6M, I wanted to get more antenna without going to a yagi/rotor. One of my 2008 antenna projects was a square spiral loop antenna for the 80 meter band. Highlighted. The EZ-NEC model of the loop pair is shown in Figure 1. These antennas represent a radical departure from previous attempts to design a horizontally polarized omnidirectional antenna. 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. Fed with a tuner right at the antenna, it is easy to hide the tuner or antenna coupler with foliage or structure. The smallest antenna described for 80 metres was a magnetic loop. Note the total length of the loop is critical, and also is the length of each side. The antenna’s substrate material is used widely in low-cost FR4 (Fibre-Reinforced plastic) with a permittivity of Ɛ FR4 = 4. 5 1996 N6LF discusses a simple way to broadband the classic half-square antenna to operate in both the CW and SSB "DX windows" on 80/75 meters. A much better type of antenna then a simple quatre wave and that has more gain is the 1/2 wavelength vertical. One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. Antenna gain is measured in either dBi or dBd. 24 cm -Tommer Antennen: 8 element 41 foot boom, N6CA: A 6m portable 4 element quad based on a design, VE7CA: Antenna. My SWR testing on the second harmonics showed RF and SWR needles swinging up and down together which usually isn't a good indication of an efficient antenna. 79 ft for a driven element on the 20 meter band) and divide it by 4…. This post relates to the design and build of a 160/80/40 Meter magnetic loop antenna. This normally comes in 12-foot lengths, and may be purchased from aluminum prod- ucts supply houses, such as Metal and Figure I. The hot side of the feed system includes a grounded matching element, allowing for a direct 50-ohm feed with coax. Inverted-V Beam Antenna for 30m 40 64. 3 MHz, dropping to 4. W/m2 = Watts per square meter. A 10/17 Meter Hanging Loop Antenna Loops work! Build a hanging loop for 10 and 17 meters that will give almost 3 dBd of gain. The first goal was to be able to talk to some of my friends on a 6 meter link that is within easy radio reach of my home. The wire loop is now the correct length. The tilt point is one meter form the base of the aerial, leaving one meter on the other side of the tilt point to raise the 4. Talked to a ham friend about how good the reviews were for practically operating tuner free. Built using cheap 4 pair (8 wire) telephone 'ribbon' cable,& (optionally) housed in cheap garden 13mm (~half inch) irrigation plastic hose. The lowest I can find is at 2. In the case of. 160 Meters: 1. Here is a small collection of EZNEC files of antennas I have interest in. Horizontal antennas for 80 through 10 meters 6 dB of useful gain is easily obtained when you install your horizontally polarized antenna at the correct height What if you can't install your 80 meter horizontal antenna at 30 meters high or higher? Use a four-square vertical array, a single vertical or vertically polarized delta loop. How to calculate antenna and matching section lengths for a Delta Loop antenna for use on the Six 6 Meters amateur ham radio band. 86` diameter (9`circumfrence) loop for 20 meters with spiral wrapped 3" diameter pool noodles. The analysis and design of a broadside glideslope antenna array and its shielded loop elements are presented. Since I like to tinker and build things I thought building an antenna would be a good idea. Martin (M0ZMF) does an outstanding job of taking you through each step of the design and building process. This property was built in 1999. Dualband Full-wave Loop Antenna for 80m-40m 34 58. Won't beat a circular loop for sure, but you have to do what you have to do. One 6 – meter “Jungle Antenna” ground plane cut for 51. The modeled Loop Fed Array delivers an. 9” 5/8ʎon 2 meters is 50” and impedance matching is provided by a low inductance coil The above combination provides a base-loaded vertical antenna that works on 6 meters. I have a 5/8th over 5/8th vertical collinear antenna hanging in a tree at some 30 odd feet high, but I never heard anything on it, except on FM. Four 6 ft/3. Note the total length of the loop is critical, and also is the length of each side. On 20 meters the SuperLoop 40™ coverts itself into a 2 wavelength open loop or Bi-Square. I only had to lengthen the outer 5/8-inch diameter tube one time after erection to resonate the antenna at the 6-Meter design center frequency. The patterns will give you a good idea how well the 6M HO LOOP will perform in your system. Its directional and has some gain, but is VERY compact. Martin (M0ZMF) does an outstanding job of taking you through each step of the design and building process. The main lobe of the antenna pattern projects in the direction of the positive X axis. each side of the top [ tip top ] of the loop. M2 offers a large mag-netic mount for the enthusiast who never wants to miss a band opening. If you lack the space for a full-sized dipole or vertical antenna for general shortwave or Ham Radio reception, then this simple, cost effective magnetic loop receiving antenna from "Chappy Happy" may be what you need for your indoor installation. You may have surmised by now that my possibilities for a decent antenna are severely limited. These antennas represent a radical departure from previous attempts to design a horizontally polarized omnidirectional antenna. Radio operators typically want to get the best performance and range out of their antenna systems. Loop Antennas - Chapter 5 - The ARRL Antenna Book, 1988 issue. 4 MHz (6 Meters). My question is the box at the bottom. The radiating pattern of a 6-sided honeycomb antenna is different from a 4-sided square loop antenna. Using the Half-Square Antenna For Low-Band DXing By Rudy Severns, N6LF 32857 Fox Lane PO Box 589 Cottage Grove, OR 97424 This article was orinally published in the ARRL Antenna Compendium Vol. Many decent 5/7 reports with this 11 meter wire loop. The EA5AVL 40M Compact 4-Square Antenna was designed to provide excellent DX communications on the 40m band, utilising readily available components and be relatively easy to construct. 75-inches for AWG24 wire, which would be less visible in a window. The loop is coupled to the feeding coax cable by a #10 AWG insulated stranded wire wound around the main loop over a span of 6 inches on. Gain over a dipole at the same height is said to be 6 dBd or about 2 S units [I can see this effect on 20m with my loop. Only a few lucky hams have room for this type of antenna on 160 or 75 meters but on 10 meters the overall length is just 43 feet long! This is smaller than a 40 meter dipole. This is the 3rd in my series of post on short (and low) 40 meter vertical antennas I am exploring for my new station. Gain for an antenna is expressed in decibels relative to an isotropic radiator (point source that radiates equally in every direction). One 2 – meter twin lead J-Pole and coax feed line with heaving line and fishing weight. Two main types of inductive coupling are the unshielded coupling loop and the shielded coupling loop. 5 cm with 16 cm radius). Physically the HO loop is 29. It makes a diamond shape and a small amount of wire should hang off the end for tuning. All of Cushcraft's Squalo antennas are rated for 200 watts PEP. l was looking for a 2 meter antenna to use for a second rig, and I thought I could adapt this design to 2 meters easily. 5m on each side is placed in the direction that the axis is pointing the top and bottom of the page (therefore, the area of the loop is perpendicular to the page) for calculation. LnR precision had only a few weeks before announced their new portable, self-supporting, magnetic loop antenna: the W4OP loop ($329. I would also suggest that you get an antenna analyzer (or borrow one), these are very helpful. Copper conducts better than gold! Antenna efficiency is the RADIATION RESISTANCE of the antenna, divided by the ELECTRICAL RESISTANCE. A few go further and show that the loop antenna imped-ance can be seen as a shorted transmission line. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Note the gain jumps over 3 dB for a stacked pair with this unique antenna. The correct lengths for the various models will be displayed in the chart. M2 Antennas. Only a few lucky hams have room for this type of antenna on 160 or 75 meters but on 10 meters the overall length is just 43 feet long! This is smaller than a 40 meter dipole. Full Wave Loop Antenna Wire Antenna The DELTA-20HP is a full wave loop designed to operate on 20m (14MHz) and 10m (28MHz) without an ATU and other bands with an ATU. This antenna normally has about a 3 DB gain over a 1/2 wave center fed dipole. This simple delta loop has excellent and proven performance. It’s modeled after the basic delta loop design and is fed with a 1/4 wavelength of 75 ohm coax (RG-59U). The Half Square antenna is a wire antenna with two vertical radiators fed in phase. EZ Hang Square Shot Kit Choose Options Ni4L Delta Loop Full-Wave $0. antenna dipole fm new zealand. LOOP RADIATION An excellent discussion of loop antenna physics can be found in McDonald’s webnotes [1]. Wire-Beam Antenna for 80m 38 62. have the same radiation pattern as a short horizontal dipole, except that, unlike a horizontal dipole, a vertical loop is vertically polarized. Concept This antenna is made for operating from outdoors, mainly from mobile shack. It is designed for portability, and can be assembled or disassembled in about a minute. Another item on this website discussed antennas that amateurs use to operate from confined locations. λ/2 at 21 MHz. I used a 2m whip with the AA-54 on a wooden step-ladder placed 61 meters (200 feet) from the base of the SAL "legs" I was tuning. By Richard Q. 91 - Inductance-Loaded Shortened Dipole for 160m. The 300 foot length of RG-6 for the north-south loop has been out there for over 20 years and it still works fine! At any rate, these loops are very cheap and easy to make and give me options when the station transmitting antenna is picking up more noise than I wish to tolerate. 5 inches square with a wind area of just 0. 17 meter center frequency to ensure a low SWR across the entire phone band. 13 centimeter antenna. 50MHz antennas plans, homemade antennas for the six meters is a curation of 162 resources about , J-Pole Antenna for your Packet Radio Station, J Pole antenna for 6 meters, The M2 6M7JHV Antenna, Comparison of Commercial 6m Antennas, 50 MHz Coax Dipole. 96 - Loop Antenna for TX for 160m. The 10-meter version of this antenna provides good performance and is just as easy to build. Unshielded Coupling Loop. I use a square untuned single turn loop of 1 square meter. The square shape allows full electrical length in compact dimensions. In fact, the worst antenna from the point of view of parasitic coupling is the square quad loop. 89 - Indoor Loop Antenna for 80m. Martin (M0ZMF) does an outstanding job of taking you through each step of the design and building process. 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. 89 - Indoor Loop Antenna for 80m. The following photos and writeup are the results. thin-wall aluminum antenna tubing. Details on the Halo antenna can be found on my Tree Friendly 2 meter Halo Antenna page. Until now, I only offered custom design and build services. Length L(meters) = 142. The best luck with rectangles has been with no more than a 2:1 width/height ratio difference. Let's consider what would happen if a square magnetic loop antenna could also fit this area and have sides equal to 0. Eventually I'll cough up the $$ for a good HF rig. 24 cm -Tommer Antennen: 8 element 41 foot boom, N6CA: A 6m portable 4 element quad based on a design, VE7CA: Antenna. Like any antenna indoors, you have to use your imagination. The previous circular loop antenna example would have a diameter equal to 0. 6 Meter 7 Element Loop Feed Antenna. The 6m 20" high Loop. The Half Square antenna is a great wire antenna for the DX edge. The characteristic impedance of a loop depends on its shape. It uses #14 stranded hard-drawn copper wires to meet the requirements of the National Electrical Code and have the best radiation efficiency. The first goal was to be able to talk to some of my friends on a 6 meter link that is within easy radio reach of my home. The feedpoint is just in the middle of the bottom horizontal wire. Another option if you can't fit a full sized beam is the Par Electronics Stressed Moxon. Why not benefit from my 35 plus years of antenna building experience, and learn more about the MagLoop brand that I created back in 2005? My magnetic loop offerings were off of most operator's radars, and therefore unknown. Note that the gain jumps over 3 dB for a stacked pair of these unique antenna s, yielding as much as 10. A Five-Element Quad Antenna for 2 Meters By Jim Reynante, KD6GLFPO Box 27856San Diego, CA 92198 If your station is located on the fringe of the repeater’s coverage area, you’ve come to the right place. 10 Meter and 6 Meter Rotatable Half-Wave Dipole Antenna The half-wave center-fed dipole is one of the most popular antennas in use today. Measure out the length of one of the sides of your square. Characteristics: It is more or less omni-directional, and horizontally polarized. Assuming a square loop a meters on a side we. I used a 50pf vacuum variable. It is always a pleasure to peer into the working mind of another homebrewer and scrounger. 40m-10m DELTA LOOP ANTENNA - GU3WHN The variety of one wave length loop shapes that can be deployed to suit the QTH. If you want 75 Meter operation make it 57 ft long. 6 Meter, "Magic Band" loop antenna Ham Radio Horizontal SSB six meters. The most common material for home building small ham radio loop antennas is common copper plumbing pipe.