However, they can also be very useful as antenna supports. In the higher bands, the directional characteristic and Verzifpelung correspondingly more pronounced. Then I cranked the mast at nominal height about 16 m high, and performed a new measurement. this antenna. The actual length of the individual wire segments and thus the total length I could in the o.a. I fed it with 300ohm TV twin lead at one of the bottom corners. In terms of my property, the Y-axis is a parallel line to my eastern property boundary and the X-axis to the northern boundary. 40 Meters with a Phased Delta Loop QST May 1984, pp. I know it tunes 40 and 80 meters quite fast! //-->. It is extremely easy to build and only requires 136 rev2023.5.1.43405. 80-meter loop is about 270 feet long (1005 divided by frequency in MHz) or fromPaul -KB4GYT 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. What is the symbol (which looks similar to an equals sign) called? It was perched on a 2.5 inch OD, 1/4 inch thick wall, moly steel mast and turned by a Tailtwister. According to Rich, this antenna is resonant at 3.650 MHz. If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=aeNHIQ_j4Dk This well-produced and richly illustrated tutorial on the classic G5RV HF Dipole Antenna was presented to the Brandon Amateur Radio Society in Brandon, Florida in 2017 by Bernie Huth (W4BGH). A Practical Antenna for 160 Metres. 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. Ask ElmerAbout BatteriesCode PracticeComputer HelpElectronicsFCC Length of a full-wave 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 Loop Skywire QST November 1985, pp. 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. Dimension "B" is the length of antenna wire called the base (width) of the antenna. meters were either 5x7 or 5x9 reports "both ways". An In-Room, 80-Meter Transmitting Multiturn Loop Antenna QST February 1996, pp. If there are any problems please let me know. space! At the spruce, I pulled the wire to target height. The 80 meter loop is really designed for 80M and 40M. https://www.youtube.com/watch?v=TqE_W_0Le0k&ab_channel=RichRodgers. Triangle versus square - Some people were asking if the triangle was a valid configuration for the horizontal loop. As feared, unfortunately, the previously perfect resonance point moved a bit, to 3.7 MHz, see Dieagrams below. 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. 43-45. But not 102 MPH, for sure!!! Maybe it has to do with the unequal sides and tilt? http://www.arrl.org/arrl-audio-news (a weekly podcast which is updated each Friday afternoon). That has left me with the last minute idea 80 meter delta loop as my only antenna. Yes I am mostly interested in data and CW. - when I tire of this antenna that is!I highly recommend http://www.arrl.org/arrl-audio-news (a wee, If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=MXTYTytR56A. Short Description:A short HWEF with a 49:1 unun and a loading coil situated towards the end of the wire making this antenna 66 feet / 20 meters long + 6 foot of end tuning wire for the 80 meter band makes this antenna a superb choice for 80 / 40 / 20 /15 and 10 meter bands. Bernie does an excellent job of explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV). Questions. search. L.B. The diagram nicely shows the resonances at 3.6 MHz and their multiples. Except for the delta loop all of the antennas had been up in our brutal weather for years. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. It always handles full legal limit power with no problems. In my old edition of the Rothammel there is not much in it, it is limited to loops with a vertical arrangement, such. As expected, the antenna radiates flatter with increasing frequency. It was slightly angled at maybe 25 degrees since the tower was only 60 ft tall. versions, say 75% of a wavelength may also work fine if you don't have the The decreasing SWR values with increasing frequency measured with the miniVNA, which could not be seen in the EZNEC diagram, are certainly due to the cable losses of the 30m long RG58 / U. 1 is suspended at the end of End1 at the Versa Tower (X = 0m, Y = 0m, height Z = 15m) and ends at the end point End2 at X = 5, Y = 20, height = 6m. easy it is to build and how well it performs. I recently had great results with a delta antennas". By "tuned for 3.55MHz" I meant trimmed. The base of the Delta Loop is only 10 feet above average ground. If tuned for 3.55MHz, I anticipate having a good SWR on 80m, 40m, and 20m. summary.." I LOVED MY LOOP"73, John it has out-performed my OCF dipole, dipole and inverted L, when ALL bands from 10-160 are taken into account. 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. At 3.6 MHz I actually have excellent values with 56 ohms and SWR 1: 1.5. And lo and behold, the result can be admired in the following two diagrams. loop on 10 meters and a rectangular loop on 20 meters, (50+ countries in 3 https://hamradiohawaii.wordpress.com. is above the horizontal base wire of the antenna. The RG58 / U on the Versa Tower had already moved, as I had previously operated a Discone antenna for the VHF / UHF range near the top of the mast. The characteristic impedance of a delta loop or quad-loop antenna is about 100 Ohm. 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. Here, the red curve is the SWR, the green curve is the impedance. Op woensdag is HF Kits gesloten. In the Handbook, the antenna is referred to as a Loop Skywire, and presented by the radio operator community as a completely undervalued secret tip in terms of cost / benefit ratio. If you need any help, we are glad to assist you with writing your article based on the information you supply. Good luck with your antenna experimenting! Many Ws and VEs were also How to choose antenna "pigtail" pragmatically? Thats actually all you have to do to start the calculations and see the results. download from ARRL website, do "search" for "constructing loop There are several ways to solve this problem. 7,95 Germany rope to whatever was handy (i.e.- nearby barn roof, tree etc.). Learn more about Stack Overflow the company, and our products. With EZNEC I had calculated the values directly at the feed-in point of the antenna. After a week I decided to feed it from the Tuning the 40/80 meter coil loaded inverted v dipo EFHW 49:1 Transformer Construction and Deployment, Four Element Yagi Antenna for Ham Radio 70cm Band, HF Indoor Loop Antenna DIY-Simple & Easy to Build.