I got the idea from the W1FB Antenna Notebook. Am I working any DX with ityes! thank you for bringing this to our attention. Ask ElmerAbout BatteriesCode PracticeComputer HelpElectronicsFCC 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. See the manual for more details. EZNEC also takes different soil conditions, construction height and wire gauge into account, so that I trust the program more than the usual simple calculation formulas c, f and k. EZNEC now requires that the suspension points be entered in a three-dimensional coordinate system. The latter also had a rope, which I once shot with the bow of a tail over the tip of a pine for the suspension of a long-wire. https://bigislandarrlnews.com. On 80 meters it equals or better every other antenna mentioned. Directivity? My question, essentially, is whether the feedline and balun choice can be optimized for not just one, but two bands 80m and 40m. Don't let deed-restricted properties (HOA/CC&R) stop you from enjoying Amateur Radio. For KW I have an 18m Versa-Tower and 3-Element-Beam for 20/15/10 m, with which I was active mostly on 20 m, because lately on 10 and 15 m relatively little was going on. Length of a full-wave 80-meter loop is about 270 feet long (1005 divided by frequency in MHz) or about 67 feet per side. We use cookies to ensure that our website runs as smoothly as possible. circular loop is "ideal", but impractical for most hams. enamelled copper wire, 2x stainless Steel (A4) M6 eye (Strain relief), 2x heat shrink tube for antenna connection. For example why not feed with 450ohm line, then a 9:1 balun into coax? I have read much about impedance, SWR, quarter wavelengths, and I simply do not have the background to make sense of it. In fact you can find this triangle or Delta configuration, in the ARRL antenna handbook 19th Edition . tower and three masts, each 35 to 40 feet long, made from 2 inch Feed point is approx 18-20' AGL and the Loop is mostly a square box. 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. The main reason for using a BalUn is to make sure that the coax cable is not part of the antenna system and that it will radiate undesirable. The 80 meter Deltaloop antenna kit contains all the components to create the ideal Deltaloop antenna. use, (October through December), 75 percentof my QSOs on 10 and 20 Then I cranked the mast at nominal height about 16 m high, and performed a new measurement. 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. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? The site will stand above all other ham radio sites by employing the latest technology and professional design/programming standards, developed by a team of community programmers who contribute their skills to the effort. Not the greatest, but it works. A Practical Antenna for 160 Metres. the loop as compared to the Carolina Windom. Once I re-build the horizontal loop I do intend to do some comparisons. Which was the first Sci-Fi story to predict obnoxious "robo calls"? While I could get it to load it naturally was only a half wave long on 160 and radiated as such. 80 meters, SWR 1.7:1, 6.7 dBi gain at 87, 0 dBi gain at 22, 40 meters, SWR 1.7:1, 7.1 dBi gain at 32, 0 dBi gain at 9, 20 meters, SWR 1.6:1, 9.6 dBi gain at 16, 0 dBi gain at 4. Opinions please? and Canada, including: KL7, KH6, JY4, V47, KH0, WP2, WP3, HP1, FO, PA2, watt manual tuners (MFJ and Vectronics) that I used took some time to tune and adding my own twist, the antenna would either work or be a I quickly found a suitable BNC adapter on PL, and off we went. I'm a FCC-licensed Amateur/Ham Radio Operator holding the Extra Class License (KH6JRM). This means that if the base wire of the antenna goes from north to south, the direction of gain will be east and west. economical and easy to build and install, works on all HF bands and Click here for the order form: Order Form, Telephone: (610) 317-9779 Address: 1843 Renwick Street Bethlehem, PA 18017. That's what I really like about this They are quieter than a dipole or a vertical, have a broader bandwidth and will usually out perform a dipole antenna.To determine the approximate circumference in feet of a full wave loop antenna use the formula: The feed point impedance of a full wave loop antenna is theoretically in the vicinity of 120 ohms and requires a 2:1 impedance transformer (for single band loops or a 4:1 balun to match on multiple bands) with 50 ohm line. Cebik W4RNL goes into Finally, I found the best description in the ARRL Handbook. It is resonant at the fundamental frequency 3.5 MHz and at any multiple, including 40, 30, 20, 15 and 10 m. The Handbook goes on to say that an ideal radiation pattern could be achieved with a circular loop, but due to the necessary suspension points it would be difficult to achieve. Anyone gauge the performance difference with this vertical Delta-loop using coax vs. ladder-line? The antenna is completely symmetrical, in short there is no earth or counter capacity required. The next step was a site survey through my garden. I will redo the analysis and update the answer this weekend. I can use it on 160 with a tuner though I run low power when doing so. It outperforms dipoles and OCF antennas. Then the spruce side was raised again and a new measurement was made. with the other three supports. What differentiates living as mere roommates from living in a marriage-like relationship? That has left me with the last minute idea 80 meter delta loop as my only antenna. i have a horiz loop 280ft of wire fed with ladder line and up 70ft.does not tune up great on 160m but works great on 80m to 10m.signals equally as good on 17m as a 12element log at 90ft.great antenna and simple, i have a horiz loop 280ft of wire fed with ladder line and up 70ft.does not tune up great on 160m but works great on 80m to 10m.signals equally as good on 17m as a 12element log at 90ft.great antenna and sim ple. google_ad_client = "ca-pub-9377297764300878"; about 67 feet per side. (This includes any inappropriate posts on a topic, as I cannot monitor every topic.) Post #1554. http://www.arrl.org. The result is to be admired in picture below. https://hamradiohawaii.wordpress.com. 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. percentof them being with stations outside North America *(about 10% diagram. Feedback QST May 1996, p. 48. 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. Next, the total length of the wire was to be determined. https://amateurradionewsinformation.com (Amateur Radio News & Information). wire to the top of masts (Figure A below). Which is better in my situation: Balanced dipole, or as much wire as possible in the air? night.It is amazing how much louder some stations are on Well, the I'm a substitute teacher at the Laupahoehoe Community Public Charter School, 80 Meter Full Wave Loop Ham Radio Antenna. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Questions. antennas, not only is the old saying "the higher the better" true, but rev2023.5.1.43405. The 80m delta loop is a field day team's secret weapon to run 80 and 40m frequencies. Easy Delta Loop for 50MHz Build your own delta loop antenna for 6 meters band The GM3VLB 5 Band mini delta beam In the following, the construction of a simple multiband delta-loop antenna for the bands 80-10m is described. I did not try weatherproofing.For antenna insulators, I used porcelain electric 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. Until Monday, 12/17/12,when a 102 MPH windstorm hit my QTH I had four HF antennas at my QTH in Eastern Oregon. When the tribander went vertical it took out the OCFD pinning it between the yagi and the tower. eHam.net provides recognition and enjoyment to the people who use, contribute, and build the site. The Delta Loop is not only a great transmitting antenna but a low noise receiving antenna. And lo and behold, the result can be admired in the following two diagrams. This was designed for 80 meters, not 160. They have worked very well. up each mast one-by-one with the rope and pulley. As it turned out, I was not so far off with my guessed values. In the following picture the SWR can be seen again for the range 3-4 MHz in high resolution. The part wire no. Use a TV coax and balun for a poor-man's OCFD? Many BalUn manufacturers only look at the impedance matching but forget to look at the common mode current attenuation. 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. This antenna normally has about a 3 DB gain over a 1/2 wave center fed dipole. On 80 meters it equals or better every other antenna mentioned. I know it tunes 40 and 80 meters quite fast! nets I was 20 over S9 to otherWA and OR stations who were 100-200 According to Rich, this antenna is resonant at 3.650 MHz. TricksHam SatellitesShortwave ListeningSSTVSupport The SiteSTOREVhf and UpContactSite MapPrivacy PolicyLegal StuffAdvertising Info According to Rich, this antenna is resonant at 3.650 MHz. The project is straight forward, simple, and gives you emergency communications while you peddle down the road. TrackBack URI. I'm considering putting up a horizontal delta loop of the type mentioned here, and am curious about the placement of the 4:1 balun some have mentioned. fromPaul -KB4GYT I had great results with it from Alaska and the Yukon on I recently had great results with a delta 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. KL7JR, 1. Delta Loop antennas features particular triangular shape with equal length sides, and characteristics that make these antennas suitable for portable and fixed use. This length I had in wise foresight already off, i. I had a bit diverted as a possible reserve. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. By "tuned for 3.55MHz" I meant trimmed. I've seen strong recommendations for using 300 ohm twinlead and a balun near the ground, but others still say the longer coax run isn't a problem. Hi Jerry, I had a similar antenna up for a while. on signals mentioned above over the two-day period of tests.I am The opposite end of the feed point is approximately 35' AGL. This allows us to adapt an unbalanced system (coax cable) to a balanced antenna system (delta loop or quad-loop antenna). 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. Recommended height is 40 feet or more at highest point, but higher is better. Believe me when I say, it was the best all This configuration is best suited for working long haul DX. At the spruce, I pulled the wire to target height. great time with it.When I first built it, I fed it from the (I realize the software may provide a better answer, but it does not explain things). BD4.DX worked on 17 meters was KL7 and OH1. 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 80m 2 element Yagi antenna 2 elements short boom yagi for 80 meters Receiving antenna for low bands K9AY loop antenna installed at PA6Z Contest group. On 75 and 80 meters, you should have about a 220 kHz bandwidth. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); 7,25 The Netherlands Loop antennas may be constructed in many forms including horizontal full wave loops in square, rectangle or triangle (delta) shapes. Length of an impedance matching section made with 75-ohm cable with a cable velocity factor of 0.80 (foam dielectric): Formulas The formulas for calculating the approximate length of a full-wave loop antenna are: Full-wave loop in feet = 1005 / frequency in MHz Full-wave in meters = 306 / frequency in MHz Do you already have specific dimensions in mind? On the other hand, the SWR, to my delight at 40m, improved to an acceptable 1: 1.7. Contact the site with comments or questions. Debugging SM0VPO's spiral loop antenna build. is above the horizontal base wire of the antenna. 5-16.2. 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. There are several ways to solve this problem. Thanks for your support! 573. mechanical build process for a 160m-long multiband loop antenna, including its support system, tuning, and SWR analysis. It did however work as an awesome 160 receive antenna option. The G5RV is an excellent choice for the 20 meter band. The 3 suspension points were already there: the Versa Tower, the TV antenna mast on the roof, and the spruce. 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). found to be so appealing about this antenna was that it was fairly (www.cebik.com) Do a If tuned for 3.55MHz, I anticipate having a good SWR on 80m, 40m, and 20m. my time and effort putting the tribander back up. In my old edition of the Rothammel there is not much in it, it is limited to loops with a vertical arrangement, such. Experimental Wire, Copper/Kevlar Wire, Copper/Stainless steel Wire, Your email address will not be published. I found a 60 meter resonance for this 160 loop (third harmonic) and it did not work as well as a low dipole cut for 60 meters. WOW! 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? fence insulators.Once the support mastsare complete with guy I'm considering putting up a horizontal delta loop of the type mentioned here, and am curious about the placement of the 4:1 balun some have mentioned. Amateur Radio Bicycle Mobile Setup. For Amateur Radio Antenna Topics and Discussions, stay here. The chart below will give you the actual dimensions per band so you can see if you can fit this type of antenna at your location. The following analysis is for a horizontal, equilateral triangle loop with all three corners at 60 feet. Join Amazon Prime - Watch Over 40,000 Movies & TV Shows Anytime - Start Free Trial Now, HDMI To RCA Composite Enables Users To Stream With Old TVs, Live Police Scanner Feeds On Your Computer, The Guide to Setting Up Google Chromecast, These Bluetooth Headphones Live Up To The Hype, JBL Charge 3: The Ultimate Bluetooth Speaker, More Audiophiles Using The Transcontinental Studio Microphone. Will try to get it in the air! But not 102 MPH, for sure!!! https://hamradiohawaii.wordpress.com. I had played with the delta loop a bit before the wreck but now that it is my only antenna I checked it out further. The 1:2 BalUn is built around two FT240-43 ferrite toroidal cores. 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. As a compromise would then be a square arrangement in question, which was also described here. Ham Radio-A 40 meter folded dipole antenna using w 2 meter VHF Halo Antenna Assembly and Testing. A "One-Masted Sloop" for 40 . It was slightly angled at maybe 25 degrees since the tower was only 60 ft tall. Theoretical considerations and preparations. Now with a handy mounting plate for the toroidal cores, so gluing is no longer necessary. They can also be in the vertical plane and are most often in the same shapes with the delta being very popular as it has both vertical and horizontal polarization. Even up on the hill in Martinez it wasn't bad. Loop Antennas and Calculator. I'd like to put up an 80m delta loop. On the internet I got some tips, partly with contradictory legends, which made me curious. The feed point insulator has a SO-239 connector. I lived down Morello Ave a few blocks from (just past Viano) you years ago and never had any ugly wind problems there! miles away. The transceiver is an Icom 7300 which tunes SWR 3:1 or less. top (apex about 50 feet or so). HF & ShortwaveLicense StudyLinksMidi MusicReading RoomRepeater Basics My antenna has an apex at 60 ft, and is fed with 300 ohm ladder line, and I use a Palstar tuner which has absolutely no problems finding a match on ALL bands 10-160. weeks of casual operating! 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. duty, I could pull it tight. This project involves a management team of volunteers who each take a topic of interest and manage it with passion. . feet of wire and a tuner. The former, barely used long wire was used for the loop, for the other half I took another type of insulated copper strand. Definitely! Moving to any angle is easy with EZNEC. from the tower I used an electric service entrance insulator fastened by - all I had in the garage at the time of the build!All 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. 11,25 France. By varying the location of the feeding point within the triangle changes the radiation angle of the antenna. cw4X4 20m cwTF3 20m cwKH2 20m Read the coordinate image if I moved the mouse pointer over the respective segment. requires no special feed networks, only a transmatch, coax and some (Note: #1 is available to Vertical delta loops can be oriented several way but the most popular is to have the pointy end at the top (usually a single support) and the lower horizontal ends just out of reach of humans and animals. If you continue to use the website, we assume that you agree. /* Ad banner 160 x 600 */ 7 Delta Loops for 7 MHz. In fact, the upper band values improve here, but the SWR gets worse at 80 meters. For the latest Amateur/Ham Radio news and information, please visit these web sites: http://www.HawaiiARRL.info. If necessary, both bands could also be operated without additional adaptation. i have a VERTICAL delta loop cut for 80 meters.Fed at the corner. Thank you for visiting my Amateur Radio Blog. longer to start with to better fit my backyard. corner.I have used it on most bands but my favorite is An 80 Meter Horizontally Polarized Full Wave Loop Antenna Where I live, there are many trees that often get in the way of antennas and antenna towers. How high off the ground? At 7 MHz I have theoretical 128 ohms and SWR of 1: 2.8. It will be about equilateral. Now we're in Folsom and get all kinds of strange weather! Thanks again Glenn, that all makes sense. 73, Paul KB4GYT in South Carolina. Thanks for the feedback and thanks for your service in the USN. Due to the possible suspension points, a triangle of about 20x30x30m would be suitable, fed by a coaxial cable in one corner of the triangle, i. at the suspension point Versa Tower. After we had the Delta loop of our OV home G25 back in the gears (see action Nobel laureates ) and I was very pleased with the send / receive properties, I wanted to build this type of antenna at home. What parts of the bands will you use? Please submit any Amateur Radio related news or stories that you would like to see, here on eHam.net. Likewise, the advantages of a coaxial cable compared to a chicken ladder with Matchbox for this type of antenna are practically and metrologically documented. 80 meter loop structure displayThis 80 meter loop is actually 86 meters, or 282 feet of wire. W5E2 into column 1, i. so wire1 / end1 meets wire5 / end2. Maybe it has to do with the unequal sides and tilt? It is fed at the top (90 feet) with RG 213 (200 foot run to the shack) through a 4:1 current balun. From my Balun to my tuner with a short piece of low loss 50 ohm coax. The antenna is a multiband antenna without traps, which can be fed with normal RG58 coax, and costs almost nothing. 20-21 few! Originally, I had inserted the Y-axis with 30m in the Wires table described above, so without first calculating the actual theoretical resonance length. 20 meters is kind of odd, I've worked DX there, but it seems like it doesn't do well to the west. Very quiet receive antenna. Never will Go back to a dipole or G5RV again. This is because not only does the coaxial cables sheath radiate while transmitting, but the sheath also acts as a receiving antenna. my portable outings! With the SWR button you can now display the resonances of the antenna structure over any frequency range, as shown below. What are some drawbacks to delta loop antennas? "Loop Antennas", ARRL Antenna Book, 16th edition, pages Nice and simple and it works good enough for me. I am using a home brew tuner, however old Johnson/Viking match Boxes are made of this type.There is no electrical connection between the TX output and antenna, only magnetic coupling. 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. In the column Conn, the connection points automatically enter, e.g. loop seemed to work just fine equally in all directions (I'm still 1: 1 balun, wire strand, insulators for the bracing and rope clamps I had too. This added height will be how high the base of the antenna will be above ground. "HO-HO-HOHPLs" by W4RNL But not 102 MPH, for sure!!!

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