To my delight, however, the SWR improved to an acceptable 1: 1.7 at 40m. The 600 Watt 1:2 BalUn is made up of two FT240-43 ferrite ring cores. First of all, I made myself smart in Rothammel, ARRL Handbook and Internet. This 1:2 BalUn scores very well both in terms of common mode current attenuation and impedance matching. enamelled copper wire, 2x stainless Steel (A4) M6 eye (Strain relief), 2x heat shrink tube for antenna connection. is a favorite pastime for me. It is fed at the top (90 feet) with RG 213 (200 foot run to the shack) through a 4:1 current balun. In fact, the performance of this 80 meter horizontal loop antenna, well it's almost unbelievable. About 75 The rogue wind of 12/17/12 bent the moly steel mast 90 degrees to the east and that resulted in the boom of the C 31 XR being parallel to the tower. Opinions please? right.For the feedpoint connection I used a 1-1/2" PVC pipe T Copy the n-largest files from a certain directory to the current one, A boy can regenerate, so demons eat him for years. This allows us to adapt an unbalanced system (coax cable) to a balanced antenna system (delta loop or quad-loop antenna). 80 meters 133-j50 40 meters 272-j105 20 meters 279-j80 Since you specified that you need to run coax into your shack, it is best to transform the impedance at the antenna in this case and run coax all the way into the shack. Antenna covers all bands 80-10 meters + 30, 17, 12 meter WARC Bands This antenna works as a Full Wave Loop on 80 Meters and also works as a 2 wavelength open loop or Bi-Square on the 40 Meter band. Also, a wonderful DX antenna, as I have worked as far away as Australia, on 20 meters, and as close in as 50-300 miles at night during our 80 meter rag chew. Dimension "B" is the length of antenna wire called the base (width) of the antenna. 5-16.2. It would have to be over the thumb so somewhere between 80 and 90 meters. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. BD4.DX worked on 17 meters was KL7 and OH1. the loop as compared to the Carolina Windom. A Practical Antenna for 160 Metres. Hosting. With the SWR button you can now display the resonances of the antenna structure over any frequency range, as shown below. Since a few months ago in our OV G25 the antenna analyzer fever broke out, I wanted to not only simply set up the intended antenna, but also theoretically calculate with antenna programs, measure the antenna after the set up with the Anlaysator and thus compare theory and practice. 10 and 20 meters, I was also pleased with a weekend of experimenting on 15 Learn more about Stack Overflow the company, and our products. Give a dela loop a try, you won't be sorry! The goals of the project were to provide an optimized antenna for 40m, 80m, 20m, and all other HF ham bands, in that order of priority. It can't compete with a beam on 20m, but support it between light poles in a parking lot and only stations running amps will compete with your signal on 80 and 40m. As expected, the antenna radiates flatter with increasing frequency. The direction of fire is broadside to the antenna. copper-clad steel and not all that easy to work with, but the price was Use a 4:1 balun for all delta loops, and for the larger 80 and 160m loops, no balun is required). circular loop is "ideal", but impractical for most hams. The impedance at the loop resonant frequency is approximately 100 ohms but will very slightly on harmonics. That has left me with the last minute idea 80 meter delta loop as my only antenna. Here is a sample of stuff worked with the K3 and 75w:PY2 15m cwOH3 40m cw4K9 20m cwRA4 20m cwZP6 20m cw9K2 20m cwE7 15m cwKH6 20m RTTYVK2 30m And all since July 12th, 2014Thanks for the idea - my first loop since I got my license in I can use it on 160 with a tuner though I run low power when doing so. Loops are quiet antennas compared to verticals and dipoles and are omni-directional. Canadian of Polish descent travel to Poland with Canadian passport. I've built many NVIS, OCF, and other long wires to 600 feet, but keep coming back to the loop. So I let the antenna down from the spruce side (less fron work than the crankshaft at the Versa Tower) and lengthened the wire by 2.70. Loop antennas may be constructed in many forms including horizontal full wave loops in square, rectangle or triangle (delta) shapes. Hams!About HamuniverseAntenna DesignAntenna Safety! It only takes a minute to sign up. The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists 20.000+ links organized into 600+ categories and subcategories. Remember to add at least 8 feet to dimension "A". ), then I decided to take the plunge and put up Ham Radio operators review new sites every day since 1998, for potential inclusion in the Directory, and to evaluate the best place to list them. percentof them being with stations outside North America *(about 10% Anyone gauge the performance difference with this vertical Delta-loop using coax vs. ladder-line? is above the horizontal base wire of the antenna. post hanging off near the top of tower for one of the four required The 80 meter Delta Loop is mounted in a vertical plane. https://amateurradionewsinformation.com (Amateur Radio News &, I'm the retired news director for Pacific Radio Group (Hawaii Island), with over 40 years experience in the commercial broadcast field. Nice and simple and it works good enough for me. Will try to get it in the air! (I realize the software may provide a better answer, but it does not explain things). 20-21 At 7 MHz I have theoretical 128 ohms and SWR of 1: 2.8. It is made from 12-gauge insulated wire. my portable outings! If necessary, both bands could also be operated without additional adaptation. You will also need a feed line choke or better yet, just get the Hybrid 4:1+1:1 in a single box. If the loop is going to be used as a single-band antenna (meaning that it will provide a feedpoint impedance of around 50 Ohms) then using coax for the feedline will work well. I should add to my previous comment that I feed my loop antenna with balanced feed ladder line required for the tuner mentioned here. Not the best antenna, but it works. I lived down Morello Ave a few blocks from (just past Viano) you years ago and never had any ugly wind problems there! KL7JR, 1. This configuration is best suited for working long haul DX. i have a VERTICAL delta loop cut for 80 meters.Fed at the corner. were 5x9 +20! 80 Meter Full Wave Loop Ham Radio Antenna or Amateur Radio Antenna. What are some drawbacks to delta loop antennas? bands.After gleaning all the info in the articles referenced below, I did learn however, both 300 The 80 meter loop is really designed for 80M and 40M. Once the wire was in the At the relatively low antenna height, the antenna at 80m is naturally a steep spot in the direction of 90 degrees upwards, at 45 degrees elevation it has 3 dB less. 20m.I am primarily a cw op but I do get on phone as I hope this article helps other hams to try this antenna. If you attempt to use it on other bands, the SWR will be relatively high and there will be significant loss in the feedline. But since my main interest is in 80 / 40m operation, I have then made me to connect the cable at the feed point without impedance matching. drops 30 feet straight down into my shack. also "the longer the wire the better" may also fit some loops.Since I I'm a FCC-licensed Amateur/Ham Radio Operator holding the Extra Class License (KH6JRM). ),I used my 50-foot tall This added height will be how high the base of the antenna will be above ground. The two above pictures show the radiation pattern of the Delta Loop fed in the bottom corner of the antenna. As it turned out, I was not so far off with my guessed values. This Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. SWR and impedances in the frequency range 1 31 MHz. I add "pigtails" to both ends to make it easier to connect, otherwise, it is great to use and cheap. That's what I really like about this Ideally you would want to run the balanced line all the way to your antenna tuner. into that here. According to Rich, this antenna is resonant at 3.650 MHz. Hamuniverse.com uses Green Geeks Web easy it is to build and how well it performs. Don't let deed-restricted properties (HOA/CC&R) stop you from enjoying Amateur Radio. /* Ad banner 160 x 600 */ This antenna normally has about a 3 DB gain over a 1/2 wave center fed dipole. 11,25 France. Best feed point is 1/4 wavelength (246/f(mhz)) from the top point down one side. Full wave HF loop antennas are ideal NVIS (near vertical incident skywave) antennas for local, state, and regional communications. The left picture is identical to the right one, but I have moved the diagram so that you can see the triangle from above as a two-dimensional structure. In fact you can find this triangle or Delta configuration, in the ARRL antenna handbook 19th Edition . If matched properly with the suggested quarter wavelength of 75-ohm transmission line, you should see the following SWR curves. Since the property boundaries are covered by tall trees, a square loop, as described in the handbook, was out of the question for me, but only a triangular arrangement. Maybe it has to do with the unequal sides and tilt? I also have a home grown horizontal Loop up. https://hamradiohawaii.wordpress.com. If we make the loop much longer or shorter, we would end up with the antenna being unsuitable for some of the bands. It was an 80 meter delta loop, apex up, with the top attached to the top of a 60 foot tower. google_ad_client = "ca-pub-9377297764300878"; The actual length of the individual wire segments and thus the total length I could in the o.a. Triangle versus square - Some people were asking if the triangle was a valid configuration for the horizontal loop. air and about a foot or two away from the masts, I merely tied off the By "tuned for 3.55MHz" I meant trimmed. antenna and feedline connections were made up on the ground then hoisted diagram. 40 Meters with a Phased Delta Loop QST May 1984, pp. This antenna will present an acceptable SWR over a relatively small portion of the 80M band (see below). nets I was 20 over S9 to otherWA and OR stations who were 100-200 percentsplit equally either 3x3 signals or simply "no contact at It worked just fine 80 10. In this video from AC2RJ, we see how some well-placed trees, a camera tripod, a telescoping fiberglass mast, and a "V" antenna can get you on the air without a lot of effort. It can't compete with a beam on 20m, but support it between light poles in a parking lot and only stations running amps will compete with your signal on 80 and 40m. This means that if the base wire of the antenna goes from north to south, the direction of gain will be east and west. fromPaul -KB4GYT If you need any help, we are glad to assist you with writing your article based on the information you supply. Should I re-do this cinched PEX connection? The result is to be admired in picture below. Each of the three sides is a shade over 88 feet long. It may even have loaded on 160 meters but I forgot to try. 80 meter full wave square horizontal loop feed by 600 ohm ladder line from link coupled balanced tuner. All information, images, product configurations, and documents on this website are the sole property of Palomar Engineers, Inc. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from Palomar Engineers, Inc. 1-3/4" Nylon Pulley and 1/4" Spring Hook Set for antenna wire installation, 160-10 Meter Loop Antenna System with 4:1 Balun and Choke Combo, 1.8-30 MHz, 1.5KW/5KW PEP, 40-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (40, 20, 17, 15, 12, 10, 6 meters) 500/1.5KW/5KW PEP Options, 50:100 (2:1) CUBE Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop Antennas, 50:112 (2.25:1) CUBE Balun 3-30 MHz, 1.5KW/3KW/5KW, 50:200 (4:1) CUBE Balun, 1.8-61 MHz, 1.5KW - Loop, OCF, Folded Dipole useful to 200 MHz, 80-10 Meter Loop Antenna System with 4:1 Balun and Choke Combo, 3-30 MHz, 500/1500/5000 PEP Option, Bullet 50:100 (2:1) HF Balun, .1-61 MHz, 500/1500 Watts PEP, Loop Antenna, Bullet 50:200 (4:1) HF Balun, 1.8-61 MHz, 500/1500 Watts PEP, Loop, OCF, ZEPP, Bullet Hybrid (4:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas, HF Loop Antenna Wire Kits (160-10 meters), Hybrid 1.5:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop Antenna, Hybrid 2:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop Antenna, MAXI-CHOKER Coax Line Isolator/Choke, 1-61 MHz, 3KW/5KW, up to -60 Db Common Mode Rejection, Static Bleeder Option, Maxi-Choker, 1:1 Line Isolator 3KW, 7-54 MHz Optimized for Wide Band Log Periodic, HF & 6M Beams. Add an antenna "tuner", a sturdy rig, such as the Yaesu FT-817, a microphone/cw key, and a simple grounding system, and you have a fully functional, nearly invisible ham station in your backyard. and is installed between 30 to 40 feet in the air.Scaled-down Once you try a loop antenna you will know why they are so popular with old timers but still a secret to newcomers. On the internet I got some tips, partly with contradictory legends, which made me curious. RG 213 coax (chosen for Directivity? Please share to your friends: Using the air conditioner correctly: this is how it gets cool in the car quickly, Air conditioning for the car pleasant coolness inside the vehicle. ), and about 20 percentof the total QSO's were 5x5 to "Signpost" puzzle from Tatham's collection, the Allied commanders were appalled to learn that 300 glider troops had drowned at sea. West Coast the states on the Pacific Coast of the United States, Relaxed holiday home vacation in monopoli, tui villas, Happy birthday coloring, mirrors, cute birthday sayings, Abscess at the po cause, symptoms, therapy, Couple counseling couple counseling marriage counseling 2x in frankfurt psychotherapy. The 80m delta loop is a field day team's secret weapon to run 80 and 40m frequencies. Often a quarter wave coax cable of 75 Ohm is used as impedance match for delta loop antennas, but it is then forgotten that the coax cable in many cases becomes part of the antenna, resulting in a disrupted radiation pattern. I had to realize that after 19.00h also on 20m quite quiet prevailed. As indicated in the handbook, even with me the antenna cost a penny, because I could take everything of my crafting box. If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=2zWb-KnkGdY. I've been running an open loop for the last couple of years and having good results. a 80 meter full-wave horizontal loop which would allow operation on all HF Repeater AND IT IS WORKING DX JUST FINE. I am new to HF. http://www.arrl.org. So, if we want to determine the length of a full wave loop on say 40 meter phone, we'd use 1005 divided by 7.180=140 feet (see chart below). Optimising a small magnetic loop with 1:1 SWR but little radiation, Using LMR400 and RG8x in the same feedline, UHF cubical quad VNA analysis interpretation, Actual Impedance of a folded dipole at resonance. I did not try Could you or anyone add some information on the choice of balun? We ship worldwide. 4,95 The Netherlands (letterbox) Sincerely 73 de Clinton Herbert, AB7RG. I only had The antenna is tied at three locations and insulators are supplied and factory set at the proper location so all you have to do is tie some rope to them and hoist the antenna into place. Hi John,I just wanted to let you and Canada, including: KL7, KH6, JY4, V47, KH0, WP2, WP3, HP1, FO, PA2, https://www.youtube.com/watch?v=TqE_W_0Le0k&ab_channel=RichRodgers. Use a TV coax and balun for a poor-man's OCFD? an antenna that has not been spoken about often enough. Any and all The bottom of the triangle is pulled out to the west from vertical so that the bottom is up about 45 feet. Likewise, the advantages of a coaxial cable compared to a chicken ladder with Matchbox for this type of antenna are practically and metrologically documented. The antenna is fed in the center of the any legs with a 4:1 balun with the 4x side connected to the base and the 1x side connected to 50 ohm coax to your IC-7300. Which is better in my situation: Balanced dipole, or as much wire as possible in the air? Your email address will not be published. However, they can also be very useful as antenna supports. In my old edition of the Rothammel there is not much in it, it is limited to loops with a vertical arrangement, such. The feed line is about 30' of 8U to a 4/1 current Balun. Ham Radio-Comparing a folded dipole to a regular d Building a 9:1 UNUN with FT-140-43 Toroid, Kitchen Foil Hula Hoop Loop for 15 to 10 meters. Shown below are some typical designs: This antenna is horizontally polarized and should be mounted as high as possible but works well at low heights of 10-30 feet. summary.." I LOVED MY LOOP"73, John A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. The feed point insulator has a SO-239 connector. Is it better to run 300 or 450 ohm line down and then place the balun near the entry (with a short run of coax) -- or is it OK in this case to mount the balun in the air with 50 - 60 ft of coax? The Ultimate Guide to Working Ham Radio Satellites, My 3 Favorite Antennas for Portable Ham Radio (HF), Slot Antenna with parabolic dish for 2m and 70cm, Installing a new vertical ham radio antenna, Off Center Fed Dipole (OCF) Antenna-Ham Radio Q & A, Building a copper-tape VHF window antenna. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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