Any and all Amateur Radio Stack Exchange is a question and answer site for amateur radio enthusiasts. Cebik W4RNL goes into In fact, the performance of this 80 meter horizontal loop antenna, well it's almost unbelievable. 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. eyebolt nuts with two flat washers.The coax is taped to a ten-inch How high off the ground? The transceiver has an impedance of 50 Ohm, so an impedance transformation must also be made. This antenna normally has about a 3 DB gain over a 1/2 wave center fed dipole. The second toroid is responsible for the impedance matching from 50 Ohm to 100 Ohm. commercially made baluns. The loop loaded easily on all bands 10-80 meters with my new LDG Electronics RT-11 tuner and old FT-840 transceiver. around antenna I ever used.I liked it so much I decided not to waste 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. For 80 m, the shift of the resonance is still ok, but for the higher bands, the resonance frequency wandered outside of the amateur radio ranges. 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. 1). It always handles full legal limit power with no problems. In fact now that I am retired, when I build and install another flavor of the week(an addiction I think) the first test is against this loop. Thanks for your support! I've been running an open loop for the last couple of years and having good results. 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. Please check for current shipping costs the shopping basket or on the checkout page. http://www.arrl.org. By using a good BalUn, Common mode current are prevented, which also reduces interference from your direct environment. Many Ws and VEs were also BD4.DX worked on 17 meters was KL7 and OH1. all" (you can't work them all! That's very interesting that it continues to be a "cloud warmer" at 40m and 20m, contrary to the conventional knowledge of delta loop behavior. The 40m band looks similar, but with a worse but acceptable SWR without impedance matching: Below are the EZNEC calculated directivity diagrams for all shortwave bands. But not 102 MPH, for sure!!! article!) long bottom extension of the PVC T to remove strain on the hanging I wish I had tried this antenna sooner in my ham hobby years. Post #1542. I'm amazed at how a "shorted-out antenna" can even work at all more or less so well! Remember, this loop is above a I'd like to put up an 80m delta loop. 20m.I am primarily a cw op but I do get on phone as Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. about the stories this wire has already told! My question, essentially, is whether the feedline and balun choice can be optimized for not just one, but two bands 80m and 40m. The gain is around 4 dBd on 40 mtrs, but it will seem much higher due to the very low angle, radiation pattern. I value your comments and suggestions. It did however work as an awesome 160 receive antenna option. 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. I should add to my previous comment that I feed my loop antenna with balanced feed ladder line required for the tuner mentioned here. Generating points along line with specifying the origin of point generation in QGIS, xcolor: How to get the complementary color. I don't have 6 meter capability (yet!) Recommended height is 40 feet or more at highest point, but higher is better. It seemed to do better than a 160 meter inverted-L and a 240 foot dipole fed with open wire up 40 feet. The feed line is about 30' of 8U to a 4/1 current Balun. For Amateur Radio News and Trends, please visit my news site at https://bigislandarrlnews.com.Aloha es 73 de Russ (KH6JRM). All these comments are about a vertical Delta-loop. right.For the feedpoint connection I used a 1-1/2" PVC pipe T /* Ad banner 160 x 600 */ 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. So for me only coaxial cable as feed in question, as suggested in the handbook. 20-22 An inexpensive, easy to build full wave wire loop for 80- or 40-meters. It loads on 80-10 meters, but I haven't tried making any QSOs on 80 with it. Experimenting with wire antennas