Inverted L Antenna For 80 Meters

I wanted to test a temporary / portable setup to participate in 80 / 160m contests. The center-fed inverted-L has the potential to be a quite satisfactory all-band wire antenna suited to certain environments. Proposed to explain the glaring differences between predicted and observed movements of distant galaxies, dark matter interacts with gravity but not with the EM fields of visible matter, meaning it can’t be observed directly. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. On 3830 for this contest I said about the low bands: 'an inverted L with some radials fed with a SGC-230 coupler for 80/160m. My inverted L 77 feet high and 77 feet top section from 77 feet down to 45 feet and 3000 feet copperwires as radials is a serious DX antenna on 160/80/40/20 with the low angle of radiation and the MFJ 998 legal limit autotuner at the feedpoint. The Inverted "L" is a 1/4-wave Marconi, fed against ground or a counterpoise such as radials. Switch the bottom right hand toggle switch up to Slopers The rotatable switch selects the direction on 80/75 meters. Vertical Inverted L for the 160, 80 and 40- meter bands. Antennas, 80 Meter Yagi, How To Build A Relatively Small 2-Element, CQ 1998, Jun. 40 is good off the ends; 80 is good broadsides and vertical at the same time (more so than on 160). The higher you get it the better, as in just about ANY antenna installation, but keep in mind when going from a flat-top dipole to a 90° Inverted V, you're losing 3dB in the broadside direction to pick up performance in the perpendicular directions. Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. Propagation NCJ September/October 2012 Carl Luetzelschwab K9LA Another Simple 160-Meter Antenna The March/April 2011 issue of the ARRL™s National Contest Journal had a great article on a simple 160-Meter antenna. Shorter antennas--down to about 90' overall wire length can be built and used on 80 meters. The electrical lineage of the inverted-L is from the dipole by way of the inverted-Vee. Well, almost all, people forget that when the G5RV was designed the ONLY bands it was meant to be used on was 80, 40, 20, and 10. 82 - 300ohm-Ribbon Dual Band Dipole. The small mast through the roof on the left supports the top wire to the house. A 160 meter inverted L can be used quite successfully on 80 and 40. Dipole or Vertical? Tom Thompson WØIVJ Note: This posting uses hyper links extensively. I use a SGC autotuner to match it because the L is also my 80, 40 and 30 Meter antenna. Radioddity QB25 Pro Quad Band Mobile Car Radio Transceiver V/UHF 25W +Antenna US Radioddity QB25 Pro: $94. length (L), with several inches added for tuning and for securing to insulators. It consists of two crossed inverted "V" dipoles positioned at right angles to each other and is supported at the center by a 15-foot mast. How to build a mono band 80 meter 1/2 wave wire antenna. 80m Inverted-L Antenna (Base-loaded for 160m) Click here to jump to latest news on this antenna My coaxial-dipole would just about tune up on 160m but its replacement, a standard 40m half-wave dipole wouldn’t. 5 m sections of the aluminum tubing, and the radiator is easily removed from the coil core. for 75/80 and 160 Meters. The large diameter yields broadbanded coverage of the 80 Meter Band. The designs make use of coaxial traps, one for the 80m version, two if you want to add a. This gives me the possibility to work on the 80-meter and 160-meter band, using a CG-3000 tuner. This link is listed in our web site directory since Sunday Jul 18 2010, and till today "Inverted L antenna for 160 and 80 meters" has been followed. The main category is Antenna for 160 meters band that is about 160 meters band antenna. I went back through the notes I made when I put up my inverted L, it is part of my HyGain 18HT vertical and the L transitions from vertical to horizontal at the 45' level via an added 40 meter trap (to avoid detuning the basic 18HT system) and a metal stub for additional vertical height. This simplified arrangement has several advantages, including a shorter ground distance between the ends. The main category is Homemade projects for 80 meter Antennas that is about Antenna projects for 80 meters band. Although the radial system is far from ideal, the inverted "L" has been able to gather both local and DX contacts on 80, 40, 20, 15, and 10 meters. Since you want to work locally, a low dipole is fine. The 80 meter inverted vee is a common and classic antenna. The full details were printed in the Practical Wireless magazine several years ago and PDFs are available for download from Len's website. -An antenna that I have used frequently is a horizontal 5 band trap dipole. what a 1/4 wave would provide. My only reason to operate 80 meters is to contact hams on the west coast; stations I might not run into when operating the higher bands. I'm busy building an inverted L antenna. I guess if it was not cut to resonance it would be considered an Inverted-L. Dark jacketed wire is virtually invis-ible -- Don`t let antenna restric- tions keep you off the air!. Government. ANTÉNY PRO 80 m. But I have easy access to the antenna, I had two 2. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. Place a 1:1 Balun on the Antenna end of the Feedline. However driving the inverted L against one or more elevated radials might result in higher radiation efficiency from the antenna system than when driving it against a collection of randomly-placed, random length, buried conductors. This could be a useful feature for an inverted "L. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range. The length of wire required at 1. 22 Different Wire Antennas. Total Wire Optimum Number Optimum Length Peak Gain. Think of it as an inverted L fed against an L. That placement just happened to give the best match. An inverted vee with a 40-foot (12 m) apex elevation requires only 115 feet (35 m). Of course, it is easy to raise an antenna 1 to several wavelengths over the ground at these frequencies. Grounded Loop Antenna with an option for configuration as an Inverted U. Twenty meters is up and down so it's hard to say much about how they compare for operating. I asked him about the antenna and was told that it was a 160 meter 3/8th wave, inverted ‘L’ antenna. 3:1) on 80m and 40m, and below 3:1 on 20, 15 and 10m. And due to thee characteristics and interaction with ground, this is a very good antenna for 40 and 80 meter communications. K5LAD's Assorted Ham Stuff "I can't work 80 meters, I don't have a good 80 meter antenna" How many hams have made a statement like the title of this piece? Quite a few, I'd be willing to bet. Because of yard constraints, I only use 1 radial for 160, 2 for 80, 2 for 40 and none for 30 meters. Antennas for 160 meters on a standard half acre (~100 x 200 ft) suburban house lot pose quite a problem. The antenna looks like a squared-off letter C fed in the middle of the vertical part. It's best to find resonance on any antenna, but I've also found that there are sweet spots that work for different other ham bands. For transmitting, it's best to place the transformer at the actual feed point, up, and away, from possible contact by humans and pets. However, Beverage antennas are generally about 500 ft long. This worked OK, but meant taking along some additional gear. See text for details. All Band Sloping Inverted L Antenna by LA1IC. I decided to hoist an 80 meter inverted vee to the top of my tower, and use it for local ragchewing communication, and, it would also provide a comparison antenna for the vertical array. ground plane antenna with radials. As the mast now will probably bend to the direction of the 80 meter wire 1 (or better 2) wires could be used to keep the mast straight. Short antennas are typically "narrow-bandwidth". The grounded loop antenna (non-resonant, unbalanced), works well on the HF Bands. Here's a bonus!. The inverted L is actually my favorite way to deploy the end fed half wave because it is a great performer ! It's alittle harder to put up, but it does a much better job than the inverted V. I used one of the pulleys on my tower to raise the vertical section to the top of the tower, then ran the rest of the wire horizontally to the top of a tree. The resource is currently listed in dxzone. In late 2004, I had replaced the two parallel mica capacitors with a single doorknob cap, and it had been causing the SWR to drift with temperature. This wire is an inverted L with about 25feet hanging vertical and the rest horizontal. The large diameter yields broadbanded coverage of the 80 Meter Band. I used one of the pulleys on my tower to raise the vertical section to the top of the tower, then ran the rest of the wire horizontally to the top of a tree. A peculiar antenna situation occurs on the low bands starting at 40 meters and heading toward 160 meters. No long counterpoise, radials or feedline required. I'll admit. The 160 m Inverted -L tied to tree came down often. The utility pole was set 5 feet into the ground and has. 80 Meter Shortened Inverted-L Bazooka Antenna (0) Sale. It is a further development of the 80m full size GPA described on another page of my site, allowing dual band operation. PREVIOUS ATTEMPTS: 1; 80 meter dipole, coax fed. If you're like me, you don't have enough real estate for that amount of wire!. ANTÉNY PRO 80 m. He es-tablished a field strength reference point at 100 W to the antenna using. " Radiation resistance for inverted "L" antennas is often lower than 35 ohms, and lengthening the antenna to raise radiation resistance and then using a series capacitor to tune out the resulting inductance is one common solution. Chapter 2 Why an Antenna Coupler? 4 Chapter 3 Basic Antenna Theory 6 Long Antenna Short Antenna Antenna Radiation Patterns Antenna Height and Radiation Angle Chapter 4 Antenna Types - Theory 10 Vertical End Fed Wire, or Marconi Inverted L Center Fed Loop Chapter 5 Practical Installations 14 Ground Systems Flag Pole Vertical Tree Mounted Verticle. Fortunately I have access to two pine trees that are well positioned as antenna. 00 On sale: $107. Inverted L Antenna 40m band. I used one of the pulleys on my tower to raise the vertical section to the top of the tower, then ran the rest of the wire horizontally to the top of a tree. A Modest 45-Foot DX Vertical for 160, 80, 40 and 30 Meters If it's you want, this low-angle radiator will put it in your lap! Build it now and collect dividends is nearly 60 ft high. On the left is a nylon line with a weight. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. It is a resonate antenna on the lower part of 40, 80, and 160. Going about 10 meters up and 10 meters horizontal. Inverted Vs and L antennas can offer you decent performance at a reasonable cost. Rated for use in an inverted-L 100W continuous or 200W peak power, or as a pair in a dipole running 200W continuous or 400W peak SSB. The more the antenna resembles an inverted-L the better the match, and the worse the yagi interactions and DX performance. 87 - Capacity Tuned Folded Loop Antenna for 20m. Most of us have always considered 160 meters to be limited to those with miles of open range and super tall towers. too short to shunt feed and a 160-meter inverted L was out of the question. Because I live in a condo, I can only put up the antennas after dark. Maximum-Gain Radial Ground Systems for Vertical Antennas Al Christman, K3LC Table I Optimum number and length of radials for a vertical antenna on 40 meters (7. (typically in average condx) The inverted L does not show this characteristic and is a better DX antenna. 85 - Backpack J-Pole Antenna for 10m, 6m, 2m. END FED INVERTED “L” ANTENNA FOR 160 – 80 – 40 METRES 1. The 160 m Inverted -L tied to tree came down often. BE SURE to add the height above ground of the end supports. A 130 foot length of 12 gauge PVC covered stranded wire slopes up from the ground system to the 40 foot level of the 45 foot tall fiberglass flagpole (about 60 feet of wire length) and then proceeds about 70 […]. Radioddity QB25 Pro Quad Band Mobile Car Radio Transceiver V/UHF 25W +Antenna US Radioddity QB25 Pro: $94. I have another general purpose antenna to cover Eastern Canada and Europe - an inverted "L" end-fed wire - which I can use on 160 meters to 10 meters, using an LDG automatic antenna tuner. The vertical section should be as high as possible, with the remainder of the antenna run horizontally to a support, such as a tree or a mast. A such low loop will be a cloudburner on 160 and 80, but will work multiband. Feed-point Connector for Inverted V Dipole Antenna Click here to get the instructions off his website. See 65+ Tower L Bend for this special circumstance. org Page- 18. END FED INVERTED "L" ANTENNA FOR 160 - 80 - 40 METRES 1. Vertical Inverted L for the 160, 80 and 40- meter Bands: by Nikolay Kudryavchenko, UR0GT. 06 dBi when straight. The full details were printed in the Practical Wireless magazine several years ago and PDFs are available for download from Len's website. Use a vertically polarized antenna if you cannot install a dipole or inverted-V dipole at least 70 feet high. Contents for AntenTop 02- 2010. KN2G - It was very busy on the band with another contest going. ground plane antenna with radials. I find the antenna simple, inexpensive, and easily concealed. The conclusion was that the antenna efficiency was poor. This antenna has a fairly low radiation angle (typically 20-35° which makes it useful for all-around communications. Home Brew 160 meter, 3/8 wave, Inverted 'L' Project/Part 2 160-meter, 3/8th wave inverted ‘L’ I will discuss the process of tuning the antenna to 160-meters. The antenna works on the bands as advertised with low SWR. But performance is down about 8-12db on a dipole on. [It can also be cut for 80 or 40]. The antenna has a small footprint, is easy to build and tune, and remains fairly inexpensive. For emergency and field operations, the 1-radial inverted-L may be usable from 80 through 10 meters. I added 9 meter of wire to each end, and cut to resonance. My only reason to operate 80 meters is to contact hams on the west coast; stations I might not run into when operating the higher bands. In the fall of 2007, I was able to install my first amateur radio tower. Both worked much better than I ever expected. nl 1 HyEndFedAntenna Thank you for purchasing the 200 Watt HyEndFed multiband 80-40-20-(15)-10 meters band antenna. ) OK for Europe plus East Coast to Mid west USA during contests. Yagi Home Made Antennas JA6HW Sumii's Home Made Tower and Antennas-JA8CMC Tastu's Home Made Antennas-JL8GFB Man's Home Made Antennas farm. Cebik - W4RNL. Shunt Feed Tower I'm using till 1999 to make place to an one el. Use Your Tower as a Dual -Band DX Antenna. I usually give myself an extra foot on each leg nowadays. Going about 10 meters up and 10 meters horizontal. I cut the antenna for 140ft and adjusted length and mid point to both center the usable SWR valley and too adjust the depth of the SWR valley. The antenna has a full 300kHz bandwidth on 80m between 3:1 SWR points. com in 2 categories. Inverted-L for 80m & 160m. All Band Sloping Inverted L Antenna by The 40/80/160 Meter Coil. By John Portune W6NBC. Pruning helps even more. This 40 and 80 meter inverted V antenna is made with loading coils. Sorry I missed you WB1GYZ N3HEE - Lots of fun working many fine QRP signals on 160 meters !. 06 dBi when straight. But I wanted to cover both 3575-3580 and 3600-3610 kHz. Grounded Loop Antenna with an option for configuration as an Inverted U. But my loop sloper is a blast to work with! It packs a lot more punch albeit only southward. 8:1, followed by the 40 m wires then the 80 m wires. 15 MHz) operating over average soil (conductivity = 0. But we don't want an inverted L. It starts at the center of the yard between two large trees and drapes over one branch about 30 feet up then travels 90 degrees over toward the house. optional kit available 40 meters. Tophat is 80 ft long and the T is connected in the center and should be 40ft long with a 20uH to the feedpoint then the shield to ground. Inverted L Dipole • An antenna that is part vertical and part Hall, Jerry, K1TD, "The Search for a Simple Broadband 80-Meter Dipole,"QST, The_Fabulous. The new antenna even during the DEC 2008-JAN 2009 period’s poor conditions. Previous to the inverted L, I tried a few ideas, some of which I am sure others have attempted also. The length of wire required at 1. Government. “Yesterday I finished mounting the antenna. Height 10 meters Wire 10m. It can be designed for use from 160 thru 10 meters very easily using the standard 1/2 wave dipole formula: 468/freqmhz = total length (ft) end to end The exact length is not critical! If you don't have room for the 160 or 80 meter versionthen design it for 40 meters and up!. ' There you go. Below about 90' overall wire length, the antenna becomes essentially a 40-meter-and-up inverted-L. So on a 40 meter vertical you can have a few radials that are 34 feet (ideal 1/4 wave at 7. This is particularly true at our fairly low 40 foot test height. Grounded Loop Antenna with an option for configuration as an Inverted U. I am hearing your AA1A beacon on 473. Twenty meters is up and down so it's hard to say much about how they compare for operating. This left 30 meters but I had never built or bought an antenna for this band. This is usually done in the form of an inverted L due to the length (unless you have tall wide spaced trees). The ends of both antennas are clear of any tree branches. At a recent S. Nothing new about this, except it seems to have been forgotten by many. 06 dBi when straight. to about 900 miles on 80 m. Height 10 meters Wire 10m. nl 1 HyEndFedAntenna Thank you for purchasing the 200 Watt HyEndFed multiband 80-40-20-(15)-10 meters band antenna. (Updated 02/28/2012 de w4kaz) (Updated 09/26/2016 de w4kaz, current links & match network schematic) (Updated 05/31/2018 de w4kaz, add/edit links to newer K2AV FCP page) TopBand? Wazzat? A saga of switching from raised radials to a version of the K2AV FCP for a 160m inverted-L. For example: - a wire length of 128' (39m) will be resonant on 15m, 12m and 10m. The vertical radiator is about 17 or 18 meters high, and the horizontal portion, which runs diagonally up hill, is somewhere between 25 and 30 meters long (I think). An inverted vee with a 40-foot (12 m) apex elevation requires only 115 feet (35 m). The end result is an end feed broadband shortened Inverted L antenna. In the drawing above, it is shown for just four bands, 80 thru 10. The new ~200-foot Rohn 45G tower in the center foreground is the new main omni-directional 160-meter antenna. The horizontal radiation patterns for the Inverted L Antenna are shown here on A for the 20 meter, B for the 40 meter, and C for the 80 meter bands. Length L(meters) = 142. This article describes how I built a multiband OCF antenna, including the actual dimensions, measurements, and some performance information. I have used inverted-L antennas with great success. A vertical seemed the obvious answer, a naturally low-angle radiator. The main advantage of this antenna is that in most cases it is already up! All you need to do is correctly feed the antenna for 160 meters, and you can get on 160 with a reasonable signal depending on how careful you are in setting things up. I don't know. A Modest 45-Foot DX Vertical for 160, 80, 40 and 30 Meters If it's you want, this low-angle radiator will put it in your lap! Build it now and collect dividends is nearly 60 ft high. Inverted Vee’s present closer to 50Ω due to the effect of the ground being close to the tip of each leg. So, I decided that for this winter, the vertical would become a dedicated 80m antenna. All-Band Doublet L. For example: - a wire length of 128' (39m) will be resonant on 15m, 12m and 10m. The principle construction material was telephone poles, about 40' high. Chapter 2 Why an Antenna Coupler? 4 Chapter 3 Basic Antenna Theory 6 Long Antenna Short Antenna Antenna Radiation Patterns Antenna Height and Radiation Angle Chapter 4 Antenna Types - Theory 10 Vertical End Fed Wire, or Marconi Inverted L Center Fed Loop Chapter 5 Practical Installations 14 Ground Systems Flag Pole Vertical Tree Mounted Verticle. Vertical T models Than I compared three of the inverted L models with the corresponding vertical Tees, with the. The inverted-F antenna was first proposed in 1958 by the group at Harvard led by Ronold W. The radiating element is 28ft 10in long. ON4UN, but average stations will only be heard when you have great openings! Only a few a year!. What would be the simplest matching network to use to produce a flat match. This led to my first 80 meter inverted vee web page. The grounded loop antenna (non-resonant, unbalanced), works well on the HF Bands. I have it up about 50-55 feet between 2 trees, ladder line drop down and makes a turn right into my shack. End-Fed Longwire Antenna with a 9:1 UnUn rated at 700 watts, covering 160 meters through 10 meters, only 124' 6" long. The wire for this part of the antenna is 12 AWG stranded copper with insulated coating. PDF file, 180 KB (ANTENTOP-02-2010, pp: 48- 51) Download PDF File! HTML Version. Vertical portion, top insulator and horizontal run can be seen here. The inverted-L is a compromise vertical that works pretty fair if you dont have the ability to get the entire antenna vertical. Conclusion. 160 Meter Inverted-L Bazooka Antenna A DOUBLE BAZOOKA antenna is an extremely broad-banded Half Wave Antenna that can operate efficiently across an entire Ham band with little change to the SWR. With a 160 ft long 160 meter Inverted-L antenna (5/16 wavelength) about 60 feet high with 100 feet of horizontal wire, the feed point impedance at resonance will be about: Zant = 30 + Rg + 200j where Rg is the ground loss, and + 200j is the inductive reactance caused by making the antenna longer than 1/4 wavelength (resonance). I found the lengths he gave to need some adjusting. A very efficient transmitting antenna in a very difficult environment. And yes you can bend any half wave antenna (dipole or end fed within limits) into a V, Inverted V, vertical or inverted L to name a few. I left the inverted V path earlier than I remembered. Well, almost all, people forget that when the G5RV was designed the ONLY bands it was meant to be used on was 80, 40, 20, and 10. These antennas can be set up as a straight suspended wire or erected in inverted V format. Flipping the Inverted "L" Antenna 'Back-to-Front' = Better Performance. Now that propagation is favoring the lower HF bands (160 meters through 40 meters), it may be a good idea making an antenna for these bands. DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft. 5 m sections of the aluminum tubing, and the radiator is easily removed from the coil core. The article was titled fiThe Easy Inverted L for 160fl, and was authored by Steve Carr, NEØU. PDF file, 180 KB (ANTENTOP-02-2010, pp: 48- 51) Download PDF File! HTML Version. This worked OK, but meant taking along some additional gear. PS: At 120° or a 60° angle per side, you'll have the flattest SWR when cut to R=52, X=0. The vertical section should be as high as possible, with the remainder of the antenna run horizontally to a support, such as a tree or a mast. After installing the OCF, check the resonant frequency on or lowest SWR for 80 meters. Trapped Inverted L Antenna for 40/80/160m This page describes my home made 'Trapped Inverted L' antenna, which is resonant on the 3 lower frequency HF bands 160m, 80m and 40m. We use this for field day, and it is pretty effective. My antenna has been up for a couple of years and I work European DX on both 40 and 80 with no trouble I have it set up as an inverted V with the center about 35′ above ground on my tower. An inverted L is a bent quarter-wave Marconi vertical fed against a system of surface, buried, or elevated radials. Most hams treat the transmitting antenna and the receiving antenna as separate entities. Contents for AntenTop 02- 2010. Optimize your performance on 80 & 40 meters. Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. Vertical Inverted L for the 160, 80 and 40- meter Bands: by Nikolay Kudryavchenko, UR0GT. SLOPER CONFIGURATION Figure 3 is the end fed half wave antenna deployed as a sloper, and I usually only use this antenna on 20 meters and up. Use Your Tower as a Dual -Band DX Antenna. It will tune all bands 160 - 10 M, but my home brew vertical outperforms the Inverted L on 20 - 10 m. 83 - Tri-Band Beam for 20m, 15m, 10m. Electromagne2c' Wave'Polariza2on' • Electric'and'magne2c'waves'are'at' right'angles'to'each'other' • Magne2c'wave'dissipates'within'a' few'wavelengths'of'antenna. The trapped vertical was a bit of an odd creation. The article was titled fiThe Easy Inverted L for 160fl, and was authored by Steve Carr, NEØU. Getting a Big DX Signal on 160-10 m from One Small, Low Antenna Chuck Counselman, W1HIS I live on a small lot in a dense, inner suburb of Boston and Cambridge. I'll admit. Full or near full size inverted L antennas for 160 meters are well accepted by top banders and even serious DX expeditions. 40M/80M Trap Dipole -- From QRZ ; 80-40 meters vertical +160 meters by EI7BA ; A Hairpin Match for the 5-element Tonna; A Long-wire Aerial for Six Metres; A Practical Low Band Antenna; All-Band Center-Fed Inverted-L by W4RLD ; Antenna combination loop/dipole, by KB9MZ; Antenna design article collection KB4YLY. ter than most hams have on 160 meters. This link is listed in our web site directory since Sunday Jul 18 2010, and till today "Inverted L antenna for 160 and 80 meters" has been followed. This is the second antenna I purchased from them. I love the simple elegance of resonant wire antennas. " Radiation resistance for inverted "L" antennas is often lower than 35 ohms, and lengthening the antenna to raise radiation resistance and then using a series capacitor to tune out the resulting inductance is one common solution. Height 10 meters Wire 10m. for the 160 Meter Band. optional kit available 40 meters. My work for this step began with the construction of 8 custom coax cables to complete all of the connections between the antennas, electronics and hard-line feeders on the tower. See updated video. I usually give myself an extra foot on each leg nowadays. Because I live in a condo, I can only put up the antennas after dark. There's also a 160-meter Inverted-L Bazooka and an LNR EndFedZ EFT-10/20/40 MKII up there. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. A second advantage of lowering the antenna to near 1/20th wavelength is a lowering of the background noise level. Make for 160, 80, 40, or 20 meters with the appropriate single-band L-network. There are numerous reasons why people shy away from trying to put up a good antenna for this band:. com in 3 categories. The design procedure for the L net- work is to estimate (or measure) the im- pedance at the transmitter end of the coax. Vertical Inverted L for the 160, 80 and 40- meter bands. A 14 meters ( 46 ft ) multi band antenna for small gardens that works well on 80 meters Main bands (@~50 ohm) are 80m / 40m / 30m / 17m / 15m / 12m. Understanding Antennas for the Non-Technical Ham ii Preface One reason for writing this book is to educate you so you can make an informed choice concerning the best antenna for you. Random Wire Antenna Lengths. I have also used the antenna with an L-network tuner on 75, 40, and 20 meters with delightful results stateside. Antennas for 160 meters on a standard half acre (~100 x 200 ft) suburban house lot pose quite a problem. long multiband inverted L 160-10 meter antenna using MFJ-998 tuner. The Inverted L over FCP at HC1PF. The lower cost and the fact that this product includes a transmit / receive antenna switch box makes it a better choice. My best DX on 80 with the inverted L was the East coast from Oregon (pretty easy on winter nights) and Hawaii on a 160 meter version. Inverted L at KE14EX Supported by TALL Georgia Pines. 88) should also work well. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. Dave Tadlock, KG0ZZ, has a number of YouTube videos showing how to build antennas. I like to use a home made current choke to keep RF from coming back on the feedline. Overall length is 40 ft. On 80 meters it is an end-fed **half-wave** L with the current max up at the bend and a high voltage feed at the end. It is a full size antenna on 40 meters and a shortened 80 meter antenna. Please try again later. A conventional coax-fed, half-wave dipole doesn't provide a low SWR over the entire 80-meter band - an inconvenience for those of us who like to operate phone and CW on that band. Vertical portion, top insulator and horizontal run can be seen here. It's an 1/8 wave vertical on 160 meters also. 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. It is sort of an inverted L. The resource is currently listed in dxzone. inverted-L and an erect L. It will have a 55 foot vertical element, then run horizontal to the ground for another 90 feet +/-. Details page with the Paypal order form. On 80 meters, the L-shape reduces the signal strength almost half, to 3. Several comments will follow concerning each of these antenna types. • It was used as a multi-band antenna because when fed with ladder line (not coax!) it is easy to match the on any band from 80m to 10m • A G5RV used as a multi-band antenna should be fed with ladder line. C21GC was on the air, couldn't even hear it above the high noise at my location on the inverted L, the AD loop pulled the signal out of the noise and got me a fine new country on 80 meter CW. Full or near full size inverted L antennas for 160 meters are well accepted by top banders and even serious DX expeditions. I went back through the notes I made when I put up my inverted L, it is part of my HyGain 18HT vertical and the L transitions from vertical to horizontal at the 45' level via an added 40 meter trap (to avoid detuning the basic 18HT system) and a metal stub for additional vertical height. The vertical section should be as high as possible, with the remainder of the antenna run horizontally to a support, such as a tree or a mast. Lets just say in radiates. I am hearing your AA1A beacon on 473. Use a vertically polarized antenna if you cannot install a dipole or inverted-V dipole at least 70 feet high. See updated video. The center-fed inverted-L has the potential to be a quite satisfactory all-band wire antenna suited to certain environments. 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. RE: 160 Inverted L, Welcome to Winter; My inverted L is 130 feet in total length, with half going up and the other half horizontal at about 65 feet. Dipole or Vertical? Tom Thompson WØIVJ Note: This posting uses hyper links extensively. I have used this by it self and it worked great. An Inverted V and an Inverted L For 80 meters switch the toggle switch to CW (Off) when operating in the CW band and SSB when operating on 75 meters. The third reason is a desire to teach basic antenna theory to the. The feedline and antenna seemed to be in good shape. This gives me the possibility to work on the 80-meter and 160-meter band, using a CG-3000 tuner. This feature is not available right now. 5 foot level off at a 90° angle to form the flat portion of the inverted L. I also fashioned an OCF 80 Meter inverted-V for comparison. For example, a dipole antenna for the 80 meter band requires a ground length of about 140 feet (43 m) from end to end.