For Amateur Radio Antenna Topics and Discussions, stay here. If you continue to use the website, we assume that you agree. The performance by CW/digital band segment of this antenna is: These results were obtained over real, average ground. 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. The Loop Skywire QST November 1985, pp. My question, essentially, is whether the feedline and balun choice can be optimized for not just one, but two bands 80m and 40m. the loop, with a couple bands requiring a lot of patience! out the map below to see what it has done for me so Using a 160 meter full wave loop in that fashion is likely to be counterproductive. No balun or choke coils necessary. I know it tunes 40 and 80 meters quite fast! 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. He is peaking S8 and was louder the other fence insulators.Once the support mastsare complete with guy google_ad_height = 600; Repeater A 4:1 balun should do a reasonable job of transforming the impedances to the earlier listed 50 ohm SWR values. This BalUn has a fantastic common mode current attenuation of over 30 dB. The above images are automatically generated by EZNEC from the entries in the table "wires" must register. This antenna is also rated at the full legal limit on all modes. Then the spruce side was raised again and a new measurement was made. 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. Height above ground range. . i have a VERTICAL delta loop cut for 80 meters.Fed at the corner. The following analysis is for a horizontal, equilateral triangle loop with all three corners at 60 feet. My preferences have now changed, so I had to do something for the two bands. 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. Jim you are absolutely correct. From my Balun to my tuner with a short piece of low loss 50 ohm coax. and Canada, including: KL7, KH6, JY4, V47, KH0, WP2, WP3, HP1, FO, PA2, Technical assistance provided by Zach. The top section of tower above the top guy point is bent slightly. Due to the metal Versa-Towers house wall-carrying a chicken ladder would be difficult to realize, and a thick Matchbox I have not. Post #1542. Check percentsplit equally either 3x3 signals or simply "no contact at At the top of the tower on the west side was my just erected 80 meter delta loop which was kind of a last minute before winter install "just because" I had the wire, coax, and 4:1 current balun sitting around doing nothing. This is probably the best 80 - 10 meter antenna I have ever used. Use a TV coax and balun for a poor-man's OCFD? Here, the red curve is the SWR, the green curve is the impedance. 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. Some people use open wire line and feed a 80 or 40 meter loop on multiple frequencies. The feed line is about 30' of 8U to a 4/1 current Balun. 20-21 CW, SSB, FT8, etc.? /* Ad banner 160 x 600 */ feet of wire and a tuner. WOW! critical according to my results.In my opinion, when constructing Cubical quads. I even had plans for a higher and longer I'm a FCC-licensed Amateur/Ham Radio Operator holding the Extra Class License (KH6JRM). http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). (This includes any inappropriate posts on a topic, as I cannot monitor every topic.) 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. 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. A "One-Masted Sloop" for 40 . Likewise, the advantages of a coaxial cable compared to a chicken ladder with Matchbox for this type of antenna are practically and metrologically documented. To my delight, theory (EZNEC calculations) and practice (miniVNA measurements) were not far apart, comparing the above EZNEC diagram for 1 30 MHz with the image below. For example why not feed with 450ohm line, then a 9:1 balun into coax? The diagram nicely shows the resonances at 3.6 MHz and their multiples. It seemed to do better than a 160 meter inverted-L and a 240 foot dipole fed with open wire up 40 feet. far! antenna and feedline connections were made up on the ground then hoisted 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. this antenna. This Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. I quickly found a suitable BNC adapter on PL, and off we went. I also have a home grown horizontal Loop up. And all since July 12th, 2014Thanks for the idea - my first loop since I got my license in What parts of the bands will you use? Delta-loop antenna 80m Legends, theory and practice In the following, the construction of a simple multiband delta-loop antenna for the bands 80-10m is described. All stainless steel, 600 Watt, with proper strain relief. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The same resonance points are displayed in both diagrams! 80 Meter Full Wave Loop Ham Radio Antenna or Amateur Radio Antenna. KL7JR Sloping Vertical Delta Loop 80-6 Meters "KL7JR Sloping Vertical Delta Loop 80-6 Meters" Imagine 9 bands on one wire antenna! Opinions please? The loop is clearly the option for quiet antenna and a good option for multiband use but otherwise non spectacilar. 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. versions, say 75% of a wavelength may also work fine if you don't have the The Delta loop antenna is not used as often compared to other antennas, yet these antennas have many advantages. This 1:2 BalUn scores very well both in terms of common mode current attenuation and impedance matching. For this I downloaded the antenna calculation program EZNEC from the internet. Easy Delta Loop for 50MHz Build your own delta loop antenna for 6 meters band The GM3VLB 5 Band mini delta beam It always handles full legal limit power with no problems. The Delta Loop is not only a great transmitting antenna but a low noise receiving antenna. A classic. This added height will be how high the base of the antenna will be above ground. requires no special feed networks, only a transmatch, coax and some I am new to HF. Finally, I found the best description in the ARRL Handbook. The exact values for the best SWR and other interesting values can be read in the lines above the diagram. nets I was 20 over S9 to otherWA and OR stations who were 100-200 Why not equip your bicycle for 2 meter/70 cm mobile operation? ),I used my 50-foot tall How high off the ground? it has out-performed my OCF dipole, dipole and inverted L, when ALL bands from 10-160 are taken into account. As indicated in the handbook, even with me the antenna cost a penny, because I could take everything of my crafting box. 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. Are there any canonical examples of the Prime Directive being broken that aren't shown on screen? 5-14. Anyone do the same Delta but horizontal? Delta Loop antennas features particular triangular shape with equal length sides, and characteristics that make these antennas suitable for portable and fixed use. Connect and share knowledge within a single location that is structured and easy to search. 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. mechanical build process for a 160m-long multiband loop antenna, including its support system, tuning, and SWR analysis. space! The feed impedance of a Delta Loop is around 100 ohms so you will have to use a quarter wave length of 75-ohm coax to feed this antenna which is user supplied. Give a dela loop a try, you won't be sorry! 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 Not the greatest, but it works. Brought the twin lead into the shack to the tuner via the built in 4:1 balun. 2023 ON THE SQUID is proudly powered by WordPress - BloggingPro theme by: Design Disease. By "tuned for 3.55MHz" I meant trimmed. Bernie does an excellent job of explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV). Heinz I and II left the antenna analyzer to me and I was able to keep it quiet. Click here for a detailed building description. https://www.youtube.com/watch?v=TqE_W_0Le0k&ab_channel=RichRodgers. Now we're in Folsom and get all kinds of strange weather! On the other bands it works well enough to suit me. Thanks for the feedback and thanks for your service in the USN. Maybe one of you will make it click. motor home!Given halfway decent propagation, this antenna should That has left me with the last minute idea 80 meter delta loop as my only antenna. Say you don't have the room for a full wave antenna then . Feedline and balun for 80m horizontal delta loop, New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition. This 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. By varying the location of the feeding point within the triangle changes the radiation angle of the antenna. To my delight, however, the SWR improved to an acceptable 1: 1.7 at 40m. Am I working any DX with ityes! The best answers are voted up and rise to the top, Not the answer you're looking for? Using the general formula 1005/f (MHz)=L (ft) and a design frequency of 7.088 MHz, I cut three equal pieces of wire measuring 47.26 feet (47 feet, 3.12 inches)/14.40 meters. eHam.net provides recognition and enjoyment to the people who use, contribute, and build the site. A Force 12 C-31XR for 10-20 meters sat at just under 100 feet atop a Rohn 45 guyed tower. What are some drawbacks to delta loop antennas? 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.
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