Its resonant frequency was around 1.7 MHz! 160m Twisted Loop Antenna. On 160M our antenna is a quarterwave fed against poor earth, which in turn raises the feedpoint impedance somewhat. for the 160m L to the coax switch at the base. Pretty big signal. Found inside – Page 134Design - in BASIC ; Novice Guide To Watts ; The Hybrid Quad - low windload , you have a big one ; Antenna Magictures ... The Amazing Inverted L Making Your Own PC Boards - part I Anfor the good old HW - 101 : Ham Radio Is 41 more . To prevent common mode RF from traveling back on the coax shield of the transmission line, I feed the antenna through a homemade RF choke made of 22 turns of RG-58X on a plastic form cut out of a Folgers coffee container. The junction box which I picked up at a big box hardware store has 4 holes it in, one on the bottom for the feedline to enter, one on each side to which the center conductor and shield is connected to use 1/4 inch stainless hardware with a neoprene washer on the inside. My most recent antenna for top band was an odd shaped 160 meter full wave length loop. Below are the details of my antenna which is a new twist on a well established antenna. Of the bunch 7 are buried in areas where vehicles and horses roam. 64-65. du ck si ar owf l tb -h ge … 80, there was Chuck on 80, big as life, running Europeans. The radials in the ground were from my previous 160m Inv L antenna. The Low Band DX'ing book by ON4UN is another valuable resource, particularly for Top Band (160M). 160 meters - Super Linear-Loaded inverted V. Semi-Vertical Trap antenna for 1.8 mhz, 3.5 mhz and 7.0 mhz. I can run the L's . Practical Antenna Handbook - J. Carr. VO1JQB's channel: https://www.youtube.com/. How to build an Inverted L for the low-bands (40m, 80m and 160m) An inverted L is just like a vertical apart from the fact that instead of going straight up (like a tuned quarter-wave), it turns 90 degrees somewhere. HI3/KL7JR First 3 weeks of operating: 75 foot long "Inverted L" at 30 feet high in coconut trees sloping to 20 feet w/15 ft coil on end facing north/south of ocean. 160m Inverted-L. 160m Inductance-Loaded Shortened Dipole. through the matching coil. with its long leg going up vertically, then away horizontally - and with its short leg lying . This portion becomes an inverted "L" ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7x22) copper-clad antenna wire. Again, some research indicated that 65′ was a reasonable length and that after 32 you started running into diminishing returns unless your soil has really poor conductivity properties. There are several variations of Potato Guns out there in the ham world. Found inside – Page 92W1GV N6JSX WB5ZDP , KG50A WASZIB Antennas 10 GHz 1269 Helix 12 and 17m 2m / 440 MHZ 30m Trap 3/4 Inverted " U " 80m ... L , My Way polarization QRP SWR Bridge quads & yagis Satari Special satellites Slingshot Three - in - One Antenna ... Once that was accomplished and we got our intermediate pull string in place I stayed in the woods feeding the Dacron rope while Glenn pulled from the other side. This shot sailed directly over the top of the tree. Certain text links and image ads on this website contain affiliate links.I will receive a small commission - at no extra cost to you - if you make a purchase after clicking on them. If you look closely in the left photo above you can see our first attempt. The 70′ tree we were tackling would easily be reached with 40 or so pounds. But at this point in the process the rope was still fairly slack with both ends of the wire still on the ground below the pulley. With winter approaching it is time to make improvements to my antenna setup for 160m. The DOUBLE BAZOOKA INVERTED-L antenna combines the features of a horizontal and a vertical antenna to provide constant signal levels to stations from near-in to more than 1,000 miles. Even without core saturation, you would be burning power heating the. November 12, 2016 At full power on 160, there would be several amps of RF current flowing. I have a low inverted L antenna for 160M. 160M Is a Tough Band . you make a purchase via a link on this site, I may receive a small The antenna wire was attached to one side of the balun and a 10-gauge wire ran to a set of fanning wires used as a ground plane on the other. So. The other side of the dipole is a quarter wave "floating" counterpoise for the inverted "L" vertical portion. This antenna was the mark 3, the previous two 17.5 m long and 22 m long were found to be ineffective on 160m. Visible here is the other side of the base, a piece of tinned copper strap connects the ground radials to the the shield of the feedline. It was modified for amateur radio use in the 1950's. Here are some of the SWR readings after final installation (measured in late October): As you can see, my 160 meter antenna can cover at least half the 160 meter band within a 2:1 SWR. Once we had the support rope about pretty close to where we wanted it we secured the feedpoint end of the wire and also attached the end of a 100′ tape measure to the pulley and pulled it up into position so we could check the vertical element height. 160m and 80m Morgain-Dipole Antenna. The main category is Antenna for 160 meters band that is about 160 meters band antenna. This was fairly encouraging to us so we continued adding radials with checks along the way. That many RF chokes is probably overkill too! Article One - The plan. As an avid antenna experimenter, I have spent approximately 10 years in the field experimenting with this antenna design and it's variants (1/4, 3/8, 1/2 wave L/Tee Vertical), between 1993 and 2002 and have also done extensive modeling using EZNEC 5.0. The geometry actually resembles an inverted L that has partially fallen over - in other words, a "lazy L". This authoritative handbook covers the design, construction, installation, and operation of 52 vertical antennas. Addition of two . BOGs need not be really long and good results can be had with just 200' of wire. We then took down the tape measure and I brought up the rope attached to the horizontal end of the L up the tower and ran it through the pulley I had up there and then down to the tower base. If you have a question, a comment or a topic you would like me to cover, please do not hesitate to ask here. Found inside – Page 2HI - PERFORMANCE DIPOLES208-852-0830 http://www.rossdist.com MPO - 5 ICOM Under = $ 73 Antennas that work ! Custom assembled to your center freq , ea , band . advise ht , of center and each end - hang as Inverted " V " . horizontal ... 132ft inverted L. This worked quite well when fed with a 4:1 balun at the base and the remote auto-atu. The rest are held down every 5 feet or so with handmade staples from #12 fence wire. It uses 4 top-hat The goals of the project were to provide an optimized antenna for 40m, 80m, 20m, and all . Spiderbeam 160m Vertical Model 160-18-4WTH 5 160-18-4WTH Manual, Ver. Thank you for your contribution. . About Inverted L for 160m The resource is currently listed in dxzone.com in a single category. Any broad range 'L' network tuner will easily handle the higher SWR values at each end of the band. I decided to keep a 1/4 wave of wire up in the air as the 'active' part of the antenna. Site Design & Content By Claude Jollet - VE2DPE. "The first edition of Stealth Antennas quickly became the 'must have' antenna book for everyone who wasn't living on acres of land. In October 2012 I changed my 160 meter transmitting antenna to an Inverted L with FCP (folded counter poise). The top two photos shows the readings with the L wire set to the SSB point and lower two photos show the full length L wire cut for CW. not bad for 160M DX'ing in suburbia I worked 213 QSO's in total incl. Many BOG users employ a simple preamp to boost the low level of signal but often the switchable 'preamp' built into a receiver or transceiver will be enough to overcome the . Each of the radials are 37.5 meters long and laid down in a pattern that will be fairly easy to fit in the woods behind my house, without having to go into the lawn. The pine in the center of the left photo above was our choice. I would like to increase the vertical component of the L however my attempts to date has resulted in an unacceptable SWR. It is . The bottom middle photo shows the results of that. 75 - 160m Inverted Delta Loop. I don't like this name, and would prefer to call it a "shunt match" because it . inverted L only about 35 ft tall designed for 80M, adding just enough coil at the base that his K2 auto tuner could load it! Based on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields through the ground. You can faintly see the fishing line coming from the reel. The AA-30 is a little difficult to read but the low SWR point was about 1992 kHz at 1.1:1. 160m Feed 160m Inverted-L L = ~170-feet H = ~60-feet NOTE: 160m feed line to be disconnected when using 630m Measurements w\ AA-54 Fr = 1.05:1 @ 475.7 KHz Z = 48.7 - j2.0 630 m Transmit Antenna Figure-6, 630m Transmit Antenna System The procedure I used for making initial adjustments was to start with the lowest tap settings for both If In fact K2FF/W5UE and our partner in crime, John, W4II (now K0XX) had combined for a #2 finish worldwide in . The following weekend Glenn came by and we soldered small terminal rings on each end of the radials to make it a little cleaner to attach to the the ground plate in the box and staple down at the ends in the ground using 10″ ground staples to help keep them in place. Vertical Radiator (More on NVIS here.). For the G7FEK tests the 40m & 160m wire antennas used at the QTH were de-tuned by removing about 2m of wire from each. commission on the transaction, at no extra cost to you. If you have a suitably located tree or two and/or a flagpole or like, then go for it. Even the use of L networks to match the 30+ ohms to 50 ohms. Let's look at a very simple solution that I think is the most useful and most elegant solution to use. Antenna? K1ZM has written this book as a fond dedication to one of the true pioneers on 160 meters, Stew Perry, W1BB, who is lovingly remembered by many people still on the air. In total 1600 ft of 14 gauge solid was used in the radial system, resulting in 16 radials each 100ft in length. It’s about 30 turns of 12AWG solid copper wire (stripped from a piece of Romex). Top Band Magic: The Inverted L on 160M, Part II. automatic antenna tuner to behave erratically and run the risk of being damaged or even damaging your transceiver's final amplification stage! As a bonus all of the 60m channels have a usable SWR, and performance has been wonderful. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's. for use by the U.S. Government. This book contains the papers that were accepted for presentation at the 1988 NATO Advanced Study Institute on Underwater Acoustic Data Processing, held at the Royal Military College of Canada from 18 to 29 July, 1988. My inverted L is larger than a quarter wavelength at 160M. 70m diameter Loop. In place of an active tuner, a 10 turn 4 inch diameter tapped coil wound of 0.250 inch diameter copper wire is used to tune the 1.8 to 2.0 MHz band in three segments. HI3/KL7JR. (But this longer length gives me a better match to 50 Ohm coax.) 160m inverted L structure 160m inverted L gain The radiator of this antenna consists of 15 meters vertical wire with another 21.5 meters horizontally at the top. 160m inverted L Antenna. Back in 2011 when I built the W3DZZ trap antenna for 40 and 30 meters Len Paget GM0ONX who originally came up this particular way the W3DZZ is designed also came up with an inverted L antenna based on another W3DZZ design, I described it earlier in my blog (see the "my Blog" link below). The one in the photo to the left above was designed and constructed by one of our club members and great friend, George, N5GH. A near-fatal experience! Double-L For 80/160m. Learn how your comment data is processed. In the case of, that we use only 2 - 3 radials lying . 160m/80m Broadband Antenna by K5GP A presentation to CTDXCC September 22, 2008 The 160m/80m broadband antenna design objectives were to have: 160 and 80 m antennas since I had no antennas for these bands, the antennas had to be hidden because of covenant restrictions, open wire feeders would be too visible to be allowed, From here I just had to cut each wire at the pipe and carport post and I was left with my 65′ radials. you make a purchase via a link on this site, I may receive a small Now, of course, the counterpoise was laid on the ground, in its final 'tuned' state, late in the month of October. 73! Before 2005 I had never operated on 160m. 77 - Capacitance Loaded Vertical Antenna for 160m. Instead, it's a 'hybrid' design because, depending on how you look at it... For the counterpoise, I started with a 130-foot (39.624 m) length of insulated antenna wire.On my first attempt, I had the entire length of counterpoise wire laid out on the ground, snug against the house foundations, and running all around the house to the opposite side.But, working with a RigExpert antenna analyzer I soon found out that the antenna was resonant way below the 160 meter band. The dimensions of the inverted L antenna for 160 meters. At 4 radials we had a pretty good match at the feedpoint but with the L wire length cut for about 1830 kHz it was apparent something was still a little off, especially as we added the additional radials. This link is listed in our web site directory since Tuesday Apr 1 2014, and till today "Inverted L for 160m" has been followed for a total of 1234 times.So far received 3 votes for a total score of 4.00/10 Ham Radio antennas. Please keep in mind this design is a compromise antenna and intended primarily for use by those . Now, the above-mentioned dimensions of the aerial part, and its counterpoise, might be slightly different at your QTH because they will depend on: Anyway, you should be able to 'tune' the antenna to resonance easily enough by simply adjusting the length of the counterpoise, like I did, and thus, adapt it to its given environment. Expect conditions to start getting a little crazy at least by the night of the 25th https://t.co/CbYaGGVuEs. Operating in last years 160m phone contest I experienced . 2. More than that and we would have been looking for the tennis ball for hours in the woods behind the tree. Glenn had recently installed a 160M inverted L at his QTH in Ocean Springs and it was performing quite well. The main HF antenna is an All Band Doublet fed with ladder line and matched with a T-Match antenna tuner including a 1:4 current balun . The number of turns is probably overkill, even for a 160 meter antenna! 73. This has the antenna tuned for the SSB sub-band. 160m Inverted-L RESULTS (October 2012) This shows the SWR curve at the feedpoint of the antenna. at the transmitter end of feedline will stop RF from entering your equipment and reduce receiver noise caused by common mode currents. This light line monofilament line would be shot over first and used to then pull up a slightly heavier string. Updated contacts and performance of antenna March 17, 2011. In the article below, I'd like to describe the theory and the mechanical build process for a 160m-long multiband loop antenna, including its support system, tuning, and SWR analysis. Ralph Holland, VK1BRH, includes the L in his computer study of several antennas, including an interesting variant of the L: the 1/2 wl inverted-L. Perhaps the earliest article on the inverted-L as an all-band antenna may have been "The 'Inverted L' Ham Antenna," by Bob See, W5LTD, which appeared in Radio and TV News , January, 1959, pp. 160m problem solved. In an instant, that all changed. The antenna is fed with RG-213 and I made a common mode choke at the feedpoint using two of KF7P’s Biggest Clamp-on #31 mix toroids and about 3 turns of the feedline. My current G5RV antenna runs east/west so the lobes naturally extend south/north. 160 meter linear loaded tee vertical/doublet antenna. The photo on the right shows the L in its fully raised height. for Coverage of 160m through 10m 53 59 72 88.5 98.5 124.5 146 162 175 Values in color are best overall lengths to use for optimum HF . Also a proud member of an international community of. Inverted-L for 80m & 160m. I asked him about the antenna and was told that it was a 160 meter 3/8th wave, inverted 'L' antenna. Our scheme involved shooting a line over one of the pines as high as we could get it and then tied off at the ground. That™s quite a bit of a horizontal span for those on small lots. Modded 160m design. If you look closely in the photo in the box in the previous photo set above you can see the excess wire hanging in the box. Well, if you have the space, time and money for that, go for it! Trapped dipone for 40-80-160 meters. Using an antenna analyzer simplifies this process considerably.On the other hand, you could tune the counterpoise to make the antenna resonate in the middle of the band at 1.9 MHz. Any antenna tuner should be able to easily handle the higher SWR over the other half of the band.Remember that you can choose to have the antenna resonate in the portion of the 160 meter band that you prefer - simply by adjusting the length of the counterpoise. With the L in-place Glenn and I started laying out the radials. The mark 3 antenna is electrically identical to the design I published in Practical Wireless in February 2004 and January 2005 and is designed to work on 160m, 80m, 40m, 20m, 15m and 10m and is basically half a W3DZZ tuned against earth with an . We have incorporated the M0CVO 9:1 UNUN at the feed point and removed both these problems, creating an antenna that exceeds expectations and provides excellent performance with a small footprint. The mark 3 antenna is electrically identical to the design I published in Practical Wireless in February 2004 and January 2005 and is designed to work on 160m, 80m, 40m, 20m, 15m and 10m and is basically half a W3DZZ tuned against earth with an . 74 - Collinear Array Antenna for 40m, 30m, 20m. Not ideal for 160M, but a workable height. Hopefully, the frequency of resonance will not shift prohibitively. You'll also see them on the roofs, towers and vehicles from Altoona to Australia. And for good reason! Here are some top-notch performers from ARRL publications, brought together in one book. So, we reloaded and Glenn lined up for another shot… you can still see the first string that appears to be coming out of my head on the right. I wanted to test a temporary / portable setup to participate in 80 / 160m contests. I then proceeded to shorten the counterpoise to bring the resonant frequency up above 1.8 MHz.To do so easily, without wasting precious antenna wire by repeated pruning, I wound the end of the counterpoise back on itself in a rough coil about 6 inches in diameter. My Inverted L also goes over the roof as in the picture . 160M Inverted L . I had listened some, but never keyed the transmitter other than to experiment with arcing capacitors and high levels of SWR. I feed my Hy Gain HT as a modified inverted L on 160 and use capacitors made from RG-11U switched by a BC-375 tap switch. If you're looking for construction projects for QRP transmitters, receivers and accessories, look no further. Experience first-hand the thrill of making contacts using equipment that you built! Charlie, K4OTV. Get in on the action! EH antenna for 160 mts by IZ7ATH. More Antenna Classics - C. Hutchinson. First order of business was to get a line over the pine we had selected. Both of the "Inverted L" radiators are even multiples of a half wave on 20m and . When building Low Band Vertical antennas, or even Inverted-L antennas for 160/80m, you will often find that the feedpoint impedence is much lower than the theoretical value of 36 Ohms. . Thank you! First let's look at my ¼ WL 160m vertical. References: Antenna Toolkit - J. Carr. I also have provisions inside the box for a bleed resistor once I gather up the parts. The back edge of my property has several large pines and my Rohn 25G tower with Tennadyne T8 is about 120′ away. My feeling is that the coil losses and tricky matching problems with top loaded wire antennas make the inverted L the way to go for simplicity of construction and . This series of photos shows the process of attaching the pulley at the approximate distance from the tree that the feedpoint box was going to sit and stringing the 135′ of 10AWG stranded wire for the active portion of the antenna through the pulley. The antenna is based on a design from NE0U which appeared in the March/April 2017 issue of the "National Contest Journal." Here's a look at the NE0U 160 meter EZ-L antenna that I installed on December 2, 2017. I wanted to put the feedpoint in an area I didn’t keep mowed so that I could simply lay the radials on top of the ground rather than having to bury. Learn the secrets of compact design for top band. Please contribute [ $0.99 ] - [ $3.99 ] - [ $4.99 ] - [ $5.99 ] by way of thanks. Design Configuration Inverted-L with a 6-wire cage for the vertical radiator. The final chapter deals with the primary components of a complete VLF radio system. This book is a valuable resource for radio engineers, scientists, and researchers. It lies on the ground and is insulated from it (#14 insulated multi strand wire).
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