Inverted Ls for 160 and 80 meters Pros and Cons of the Dual Band Inverted L Antenna. The DOUBLE BAZOOKA INVERTED-L antenna will handle full legal limit power with no effect to performance. (typically in average condx) The inverted L does not show this characteristic and is a better DX antenna. Two of the biggest challenges are the physical size of efficient antennas and noise when receiving. (3/2 λ) doublet with 31 (1/4 λ) ft of ladder line, then fed with coax. It is a full size antenna on 40 meters and a shortened 80 meter antenna. I find the antenna simple, inexpensive, and easily concealed. The resource is currently listed in dxzone. Antennas, W4TWW Coaxial Inverted “L” Antenna For 160 Meters (Rowland & MCQueen), CQ 1984, Aug pg 72. This makes it very convenient to throw the antenna up in a tree and connect the bottom of it to your radio. Until recently, my tower supported a pair of phased 40 meter delta loops. An insulator at the end should be used. Stealth Antennas •K2AMV dual-bander K8YC Spiderbeam. The radiating element is 28ft 10in long. Making of a antenna for 160m and 80mHopefully. It is a resonate antenna on the lower part of 40, 80, and 160. I have used my 160 inverted L on 40 to good affect. 5 feet? That works out to being a 5/8 wavelength on 15 meters and just a bit short of a ¼ wavelength on 40 meters. End Fed Inverted L for 40 & 80 Meters. Inverted L is the top line. For example: - a wire length of 128' (39m) will be resonant on 15m, 12m and 10m. Delta Fed Dipole Antenna 13 18. A vertical seemed the obvious answer, a naturally low-angle radiator. Although Rin may not be equal to the 50 ohms needed by the transmitter it is at least purely resistive. I operate a Yaesu FTDX-1200 with AT and a Kenwood TS-440SAT and received great reports with both radios on the EFHW-8010. Inverted-L for 80m & 160m. Sloping Dipole Antenna 11 16. This 40 and 80 meter inverted V antenna is made with loading coils. 80/40 Loaded Dipole (inverted V, center at 21 feet, ends at 5 feet) 80/40 Resonant End Fed (sloper, loaded end at 25 feet, feedpoint at 3 feet) Test Procedure. (03/07/1998) An archive of articles from QRP-L discussing the W3EDP, with comparisons to a dipole and a vertical. 140' long) BOGs show they can often significantly improve the S/N ratio on 40, 80, 160, and the AM broadcast band —as compared to an inverted-L with a good ground radial system— by greatly reducing local RFI from power line noise, etc. for 75/80 and 160 Meters. Sometimes however, the centre feed is not ideal, for example when you want to use it as a vertical. It is a full size antenna on 40 meters and a shortened 80 meter antenna. 79 - Wire Ground Plane Antenna. The optimum length of this part of the antenna will vary with frequency, the surrounding environment, and height above ground. I wanted to test a temporary / portable setup to participate in 80 / 160m contests. The feedline and antenna seemed to be in good shape. 2017 80 Through 10 Meters All HF Band Antenna, Motorized Inverted L, 2017 Antenna Design Competition, QST May 2018. Varying antenna wire lengths and/or frequency changes feedpoint Resistance. I used up two quarter mile rolls of electric fence wire. If you listen to the DX activity on the Low bands, you'd be forgiven for thinking that you're wasting your time unless you have a 4 Square Array, 20 acres of Beverage antennae, a huge Amplifier, and a neck like an anvil. 7-7 A Reduced-Size Half Sloper for 160 Meters 7-10 The Inverted-L Antenna 7-13 A Simple, Effective Dual-Band Inverted-L Antenna Our Friend The Tree 8-1 The Care and Feeding of an Amateur's Favorite Antenna Support - The Tree 8-5 The EZY Launcher 8-7 A New Way To Tree A Wire 8-9 A Tree-Mounted 30-Meter Ground-Plane Antenna 8-12 Trees and Verticals. The purpose of this. 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. 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. Antennas, Weekender, The: A 60-10-meter inexpensive vertical antenna. you should find that the SWR on 15,10 and 6 will be low. No tuner was used to obtain above results. The Inverted L My 160 meter antenna is an Inverted L. Akhirnya saya beranikan untuk membuat antenna vertikal yang kompromised di 80m. Recent tests by other hams using even short (approx. As it is insulated it can be placed in trees, under eaves or next to house trim even in attics. On 80 meters, the L-shape reduces the signal strength almost half, to 3. It will quit trying after a while. 1 MHz, it is between the 40 and 20 meter bands. The inverted-L is a compromise vertical that works pretty fair if you dont have the ability to get the entire antenna vertical. If you listen to the DX activity on the Low bands, you'd be forgiven for thinking that you're wasting your time unless you have a 4 Square Array, 20 acres of Beverage antennae, a huge Amplifier, and a neck like an anvil. The capacitor between the antenna and radial junction is replaced with a tapped coil. A second advantage of lowering the antenna to near 1/20th wavelength is a lowering of the background noise level. The antenna is resonate on both bands and does not require an antenna tuner. The main category is Antenna for 160 meters band that is about 160 meters band antenna. Azimuth and elevation plots for the lowest Inverted L (V15+H29) - bearing 90 degrees Azimuth and elevation plots for the highest Inverted L (V27+H17) - bearing 90 degrees Inverted L vs. An Indoor HF Stealth Antenna For 80 meters, I connect the opposing walls giving me 2 “L” shaped legs of the dipole. My snake is a 135-foot wire laid on the ground, fed with cheap audio shielded cable. The land-. FO8RZ - 6-Inverted L 160-80 M. As the trees sway in the wind, a system of pulleys and weights provide tension relief for the solid copperweld wire. 20 meters may be slightly higher but hopefully below 1. Order #4825 List Price: $99. 95 Amateur Wire Antennas The MFJ-17758 is a two band, 80 and 40 Meter center-fed dipole antenna capable of handling 1500 watts. 40 is good off the ends; 80 is good broadsides and vertical at the same time (more so than on 160). For those of you that use the Inverted L antenna on 160 meters, a couple of questions. The Inverted L My 160 meter antenna is an Inverted L. The 'virtual boom' is about 170 feet long and the height of the elements averages about 160 feet, or so. 160 Meters:. Bow-Tie Dipole Antenna 14 20. 52 one side. Delta Fed Dipole Antenna 13 18. The 160 m Inverted -L tied to tree came down often. An inverted "L" is a form of bent. This calculator is designed to give the total length of a particular dipole (inverted Vees) antenna, or one side of it, for the frequency chosen. 80/40 Loaded Dipole (inverted V, center at 21 feet, ends at 5 feet) 80/40 Resonant End Fed (sloper, loaded end at 25 feet, feedpoint at 3 feet) Test Procedure. The 80 meter inverted vee is a common and classic antenna. 90 MHz: This antenna is tuned by the following procedure: 1) Put up the entire length of wire and the 4:1 balun and resonate it to the upper end of 80 meters by lengthening or shortening it. I wanted high efficiency 40 Meter antenna with low-angle radiation. Does a 160 antenna (Inverted L) also work well on 80 meters and 40 meters for working DX?. The Wire Size can range from 16 AWG to 12 AWG. My snake is a 135-foot wire laid on the ground, fed with cheap audio shielded cable. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. This antenna is 58 ft tall and is mounted on a hinged base. 80 Meters was actually 1. ham radio antenna. and intend to use it to make a 2 element quad for 20 meters and a 2 element quad for 10 meters ( which my dad can use. Double-L Inverted L antenna for 160 meters | OM0A The ever-popular inverted L antenna - Ham Radio Library M0EZP 80m/160m Inverted-L Antenna for small gardens Inverted L Antenna for Shortwave Radio Broadcasting 6 Band Inverted L Antenna Double L antenna for 160 and 80 m Engineering Antenna Terms and Definitions "I" File:Wire inverted L antenna. Vertical or Horizontal Loop: The best balun for operation moderately far from resonance or on harmonics is a 4:1 ratio current Tuner. This simplified arrangement has several advantages, including a shorter ground distance between the ends. The 8 radials in that antenna are 30 meters long, which is approximately the same as 15 meter radials on 80 meters, relative to wavelength. It works best when attached to your tower/pole at about the 45-50' level. The wire is exactly 66ft long. With the solar cycle waning now, I would not want to be without a wire on. Antenna Optimization •Adding an optimizer to an antenna modeling program allows the computer to design the antenna with the designer’s goals in mind. A multi-band end fed wire antenna presents a potential problem in that a ¼ wave length antenna cut for say the 80 metre band will present a feed impedance of about 70 ohms however when the same antenna is used on the 40 metre band the feed point impendence will be several thousand ohms and therefore difficult to achieve a match even with a. Shown here is an Inverted-L with its long leg sloping to the ground. Rain Gutter Antenna with SG-230 : 41 Countries in 5 Hours with 100 Watts into a Rain Gutter! by Jack Ciaccia, WMØG. I > would like to build one for 160 meters and have a few questions: Here is. This HF multi band antenna for small gardens that works well on 80 meters Main bands (@~50 ohm) are 80m / 40m / 30m / 17m / 15m / 12m. The Performance Secret It's the Vertical Radiator. 2) Check to see that a good SWR can be obtained in or near 160 m. The trap is placed at approximately the 31. It's an 1/8 wave vertical on 160 meters also. 7J4AAL's Full-Size, 5-Element, 80-Meter, Rotary Beam Antenna This amazing antenna is located near Hiroshima, Japan. October 2011. FO8RZ - 6-Inverted L 160-80 M. Comparison to an inverted-vee The simplest alternative to this antenna is a loaded inverted-vee with leg configuration similar to that of the half-sloper wire element. An inverted L is a bent quarter-wave Marconi vertical fed against a system of surface, buried, or elevated radials. 80 and 160m. My minimum is roughly 1. Order #4825 List Price: $99. Both antennas can be constructed just about anywhere using any type of wire you may have and can be used with 50-75 ohm coax or open wire ladder. The purpose of this. I > would like to build one for 160 meters and have a few questions: Here is. This will vary based on the construction of your 43-foot vertical, its proximity to other objects, etc. Remember you have to do the same amount to both sides ! Once the SWR is good for the 40 meter band, you can test 20, 15, 10 and 6 Meters. The second rack has a cathode driven (grounded grid) 3CX1200D7 amplifier on 160 meters on the bottom, a pair of cathode driven 3-500Zs in a bandswitching amplifier that is used on 80 meters and pairs of push pull cathode driven 4-400As on 20 and 15 meters. The W7LPN version of the Inverted L Multi-Band 10-80m Antenna (See latest update 03-30-09) Electric Fence Wire- I prefer electric fence wire for all my latest antenna experiments. Varying antenna wire lengths and/or frequency changes feedpoint Resistance. Put that 4:1 balun, a couple of insulators and some extra wire to good use! If your major antenna problem is deciding whether your new rotary beam will be a yagi or a quad, this article is not for you. 2) Check to see that a good SWR can be obtained in or near 160 m. A second advantage of lowering the antenna to near 1/20th wavelength is a lowering of the background noise level. Using a tuner near the transceiver with a coax fed too short antenna is not the solution. Antenna pertama adalah w3edp yang kompromi, yang ditekuk-tekuk mengikuti kondisi space yang ada. Patterns vary per band if actually cut for 160, then used also on 40 or 80. KDØCA INVERTED L ANTENNA My low band Inverted "L" wire (a form of bent vertical) has about 12 radials buried under ground, and they are NOT resonant quarter wave radials, but this antenna works very well on 160 through 30 meters. It’s a great HF antenna for the ham radio operator with a smaller backyard! The. The antenna is resonate on both bands. ON4UN, but average stations will only be heard when you have great openings! Only a few a year!. Boleh dibilang sebagai inverted-L yang ujungnya diberi whip. 5 meters horizontally at the top. Here's a bonus!. This could be a useful feature for an inverted "L. This antenna has a fairly low radiation angle (typically 20-35° which makes it useful for all-around communications. The “Wolf” Folded Dipole antenna is designed as a regional coverage antenna intended for near and midrange HF communications in environmental disasters and military tactical scenarios. As it is insulated it can be placed in trees, under eaves or next to house trim even in attics. While this certainly was a huge improvement over my humble Butternut multiband vertical, my new tower had a major shortcoming a lack of antennas for the low. It has worked well for QPR camping, outings, and emergency preparedness, as well as fixed base antennas. Unlike a dipole, the NB6Zep will operate on all ham bands 40-10 meters (including the WARC bands) with no strain on the antenna tuner, transmission line or operator. 5 and 7Mhz) My goal is to optimise this antenna it in the real world for 160 - 80 - 40 and 30 M's Today I will make a big 12V relais with hugh contacts to short out the coils for 160M when I want to use it as a 3,5 and 7MHz antenna. An insulator at the end should be used. ON4UN, but average stations will only be heard when you have great openings! Only a few a year!. The antenna displays a low feed impedance, which allow you to feed it directly with 50-ohm coax cable. by Gene Preston, K5GP I read Rick Littlefield’s article in the June 2008 issue of QST on off center fed dipoles and was intrigued by the idea that the antenna could be extended to cover 80 meters. Well, fear not, as there is a compact solution to your MF antler woes, and it is an Inverted "L". Adding 80m to DX Commander - Inverted L. 2) Check to see that a good SWR can be obtained in or near 160 m. This will vary based on the construction of your 43-foot vertical, its proximity to other objects, etc. Like all inverted vees, it requires a single center support, which is often times a tower which is topped with a Yagi or quad for the upper bands. Multiband Vertical Stub Antennas. what a 1/4 wave would provide. N5ESE's 87 ft Inverted "L" Portable Antenna. 301 Moved Permanently. Going about 10 meters up and 10 meters horizontal. In fact, some have warned against attempting the antenna due to the trap alone. 1 MHz, it is between the 40 and 20 meter bands. This antenna can be configured as a Flat Top NVIS antenna, Inverted “V” for medium to long ranges, or a Sloping directional antenna. Install as a flat top, an inverted vee, or as a sloper, etc. antenna will give six bands, including 80 meters as a resonant band with a full size 1/4 wave element. So, I decided that for this winter, the vertical would become a dedicated 80m antenna. This makes it very convenient to throw the antenna up in a tree and connect the bottom of it to your radio. ANTENNAS FROM THE GROUND UP 26. This gives me the possibility to work on the 80-meter and 160-meter band, using a CG-3000 tuner. The Center-Fed Inverted-L Doublet We may feed an inverted L almost anywhere, but the most common places are at the end or the center. Inverted V Antenna 40-80-160. I have antenna design that requires a capacitor at the feedpoint of 120 pF. For an efficient antenna, 3 or 4 elevated radials are required for each band. Two of the biggest challenges are the physical size of efficient antennas and noise when receiving. Inverted Ls for 160 and 80 meters Pros and Cons of the Dual Band Inverted L Antenna. Full or near full size inverted L antennas for 160 meters are well accepted by top banders and even serious DX expeditions. If you listen to the DX activity on the Low bands, you'd be forgiven for thinking that you're wasting your time unless you have a 4 Square Array, 20 acres of Beverage antennae, a huge Amplifier, and a neck like an anvil. 500' 3/16" 100% Dacron Polyester Antenna Support Rope, Dipole Inverted V, L Wire. Posted on March 11, 2017 April 11, 2017 Categories Antennas - Inverted-L, Antennas - Vertical, Tech - Impedance Matching, Tech - QRP Leave a comment on 80 Meters and Up – Portable Base Matching Unit for 42 to 48 Foot Verticals and Inverted-Ls – QRP Version Why we use a Base Matching Unit (BMU) with End/Base-Fed Verticals and Inverted-Ls. 7-7 A Reduced-Size Half Sloper for 160 Meters 7-10 The Inverted-L Antenna 7-13 A Simple, Effective Dual-Band Inverted-L Antenna Our Friend The Tree 8-1 The Care and Feeding of an Amateur's Favorite Antenna Support - The Tree 8-5 The EZY Launcher 8-7 A New Way To Tree A Wire 8-9 A Tree-Mounted 30-Meter Ground-Plane Antenna 8-12 Trees and Verticals. Antennas, Weekender, The: A 60-10-meter inexpensive vertical antenna. 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. The antenna was designed for military use from 2 to 10 MHz (some references say 2 to 30 MHz). in effect, will give you an inverted "L" antenna (of sorts), depending on the length of the vertical element. Shop with confidence. Government. Butternut HF9V as a ham radio ALE HF antenna. Just need to get some coax to it and make it weather proof. My TX Antennae. Antennas, W5GI Multiband Mystery Antenna, Basilotto (W5GI), CQ 2003, July, pg 18. In each case, the KX3 measured an SWR of 1. Use Your Tower as a Dual -Band DX Antenna. For transmitting, it's best to place the transformer at the actual feed point, up, and away, from possible contact by humans and pets. Only the 80-meter antenna will be broadband, but such broadbanding is not required on the other bands. Inverted-L for 80m & 160m. This tower supports ropes for 80-meter antennas, and very long ropes that support four 1/4 wave tall vertical elements for a 160-meter four square. I did 24 hour WSPR runs using 5 watts of power with each antenna on successive days. The antenna is inspired on the 'Battlecreek Special' design, but then limited to 80 and 160m (no 40m section). The skywire loop is an excellent antenna - they can be a bit of work to get up in the air if you have a lot of obstacles (trees, xyl, etc. I want to make it work the best on average for the 80, 40, 20 ,15 and 10 meter amateur bands. See text for details. Only the 80-meter antenna will be broadband, but such broadbanding is not required on the other bands. To lay out some foundations of inverted-L operation, the center-fed version is a bit more straight forward. 39 dBi as compared with 6. The 80 meter inverted vee is a common and classic antenna. Short antennas are typically "narrow-bandwidth". ) won't tune. This wire is an inverted L with about 25feet hanging vertical and the rest horizontal. 40/80 meter dipole. Tuning is carried out in the same way that you would tune a standard 40 meter dipole. Nice job: a good, basic article. 58 one side. The result was an inv-L with the vertical section that goes up 70′, then across 40′, and across again in a different direction for another 50′. Since I cannot effort half sizes wires, I’ve been forced to look into trapped dipoles antenna and I’ve found an interesting solution on the Inverted L antennas. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's for use by the U. The wire for this part of the antenna is 12 AWG stranded copper with insulated coating. The inverted-vee dipole is a half-wavelength antenna fed in the center like a dipole. The antenna was created for the 40 meter band and above. The DOUBLE BAZOOKA INVERTED-L is recommended to be mounted close to the base of a tower. 80 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. 142 article My efforts are all about minimum weight since I need to get it on a plane fro my Safaris. ham radio antenna. It should also work on 60 and, to a much lesser extent, on 80 as well. The low dipole does a great job for distances up to maybe 500 miles on 160 or 80 meters. Many hams encounter problems in erecting just one antenna, so the thought of needing antennas for five bands seems out of the question. Fig 1 - Example of a 1/4-λ inverted-L antenna. 7-7 A Reduced-Size Half Sloper for 160 Meters 7-10 The Inverted-L Antenna 7-13 A Simple, Effective Dual-Band Inverted-L Antenna Our Friend The Tree 8-1 The Care and Feeding of an Amateur's Favorite Antenna Support - The Tree 8-5 The EZY Launcher 8-7 A New Way To Tree A Wire 8-9 A Tree-Mounted 30-Meter Ground-Plane Antenna 8-12 Trees and Verticals. Adam, in the early 80's Coleman Rowland, W4TWW published an excellent article in CQ on the Coaxial Inverted L For 160 meters. Vertical Inverted L for the 160, 80 and 40- meter Bands: by Nikolay Kudryavchenko, UR0GT. Vertical or Horizontal Loop: The best balun for operation moderately far from resonance or on harmonics is a 4:1 ratio current Tuner. 80 75 Meter Wire Antenna Sizes. will it work okay to have the "horizontal" portion sloping downwards to an attach point say 15-20 feet above the actual ground. Improving the Performance of your 160 and 80 Meter Antennas Inverted-L, T or umbrella antenna is a good alternative to very high 80 meter horizontal antennas. 160 Meter linear loaded Tee vertical doublet antenna aspect of the antenna design on 80-10 meters during the summer of 2002 I can verify that it works very well. So a slightly long inverted L was the winner since it 1) fit into the yard where the trees line up, and 2) lends itself to capacitive matching if made slightly long. Also, the farther away from resonance you try to tune, the harder time the tuner will have. The 'virtual boom' is about 170 feet long and the height of the elements averages about 160 feet, or so. In the fall of 2007, I was able to install my first amateur radio tower. ON4UN, but average stations will only be heard when you have great openings! Only a few a year!. Old feed point. This would become my primary 40 meter antenna, and, I could take down my phased delta loops. If Dx is you main interest on 160m Put up a 170' Inverted L , use an auto tuner at the base , make the vertical section as high as possible and but alot of radials on on just under the ground. The Inverted L My 160 meter antenna is an Inverted L. I have picked up the skeleton of a 4 element 10 meter quad ( cheers Dave M5 AFD) and intend to use it to make a 2 element quad for 20 meters and a 2 element quad for 10 meters ( which my dad can use ). Build a Space-Efficient dipole Antenna for 40, 80, and 160 Meters by ARRL. Multiband operation is an option. This is without a doubt my most useful and successful antenna. Contents for AntenTop 02- 2010. 04 feet 162. The idea was to test each antenna in as equivalent band conditions as possible. The wire for this part of the antenna is 12 AWG stranded copper with insulated coating. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's for use by the U. For a compromised antenna system, it performed as well as my 80 meter inverted vee. 160 Meter Folded Counterpoise Inverted L Antenna Steve Ellington The NE0U 160m EZ-L antenna at WX0V Steve Ellington 97,232 views. This antenna has a fairly low radiation angle (typically 20-35° which makes it useful for all-around communications. So, the antenna radiation is predominantly vertical in polarization. The CAROLINA WINDOM® is also ideal for those of you who want a high performance antenna to cover the bands not covered by your beam antenna. 00 80 Meter Shortened Inverted-L Bazooka Antenna (0) Your Price: $122. 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. On 80 meters, the L-shape reduces the signal strength almost half, to 3. However, Beverage antennas are generally about 500 ft long. With difficulty, it could tune 15 and 17 meters, and my LDG tuner could force it to work on 80 meters, but the amount of energy actually going out the antenna was pitifully small. inverted-L and an erect L. AI4JI Radio Repair, Antenna Sales and Amateur Radio Web Site. I wanted high efficiency 40 Meter antenna with low-angle radiation. My minimum is roughly 1. K4TR 160/80 METER INVERTED "L" ANTENNA (MADE TO ORDER) Great way to get on the 160 meter band (or 80 meters) and start working the Dx. My K9AY RX Antenna. 4 with 100khz bandwidth at or below a SWR of 2. The Wire Size can range from 16 AWG to 12 AWG. 40/80/160 Meter Inverted V Coil-loaded Dipole Antenna. So the measurements are based on a 40 meter 1/2 wave dipole. With about 65 ft, (50 up and 15 over) you would have a nice dx antenna for 80 meters. I made the trap from RG400 coax and PVC pipe. K4TR 160/80 METER INVERTED "L" ANTENNA (MADE TO ORDER) Great way to get on the 160 meter band (or 80 meters) and start working the Dx. " 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. I decided to build a 80 meter, half wave wire antenna that takes full advantage of the phone portion of the band known as 75 meters, also this antenna will not need a tuner. This link is listed in our web site directory since Thursday Feb 20 2014, and till today "Inverted L for 40/80m " has been. Follow the instructions exactly like in this video and it will work. Our popular 80m and 160m Inverted-L Bazooka Antennas are now available in a "shortened" version for space-restricted locations, while our flagship Standard Double Bazooka is now packaged as part of a Phased Array System for 80 and 40 meters. Below are presented the results of EZNec modeling of a 45 ft long End/Base-Fed Inverted-L, 23 ft high and 22 ft across. Comes complete with installation guide !!! Guaranteed Satisfaction. I operate a Yaesu FTDX-1200 with AT and a Kenwood TS-440SAT and received great reports with both radios on the EFHW-8010. This portion becomes an inverted "L" ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7x22) copper-clad antenna wire. com in 3 categories. To give ourselves a better grasp on inverted L's we will compare an L over an FCP with a better understood vertical over an FCP. Plug your coax right into this antenna ; External tuner may be needed to tune all HF bands 80-10 meters ; NOTE: your radios internal tuner will tune some of the HF bands; Use for home station, Field Day, Portable Ops, etc. The Center-Fed Inverted-L Doublet We may feed an inverted L almost anywhere, but the most common places are at the end or the center. So if I assume the popular dipole formula 468/F(Mhz) is correct then on 80 meters and applied also to a quarterwave then I would see resonance at F(Mhz) = (468/66)/2 = 3545Mhz. What happens if we make the same 60 and 30 foot radials close together, with 2 foot open-end spacing?. This 40 and 80 meter inverted V antenna is made with loading coils. See text for details. Archived from the original PDF on 10 September 2005. Because the amateur bands are related harmonically it is possible to produce an inverted L antenna that is resonant or almost resonant on a number of bands. Theodore (Ted) S. However, gain is reduced. Improving the Performance of your 160 and 80 Meter Antennas Inverted-L, T or umbrella antenna is a good alternative to very high 80 meter horizontal antennas. The new ~200-foot Rohn 45G tower in the center foreground is the new main omni-directional 160-meter antenna. 80 and 160m. I find the antenna simple, inexpensive, and easily concealed. The internal tuner of my FT950 tuned this antenna also on the other bands. The 80-meter antenna is a 130-foot dipole, fed in the center with 70 feet vertical and 30 feet horizontal 10 feet off the ground and 80 feet off the ground. I'll admit. During the past few weeks, I've been experimenting with the versatile inverted L antenna for my small house lot. The antenna is inspired on the 'Battlecreek Special' design, but then limited to 80 and 160m (no 40m section). 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. No change was made to the 80-meter dipole or the transmission line. This will vary based on the construction of your 43-foot vertical, its proximity to other objects, etc. The Inverted L My 160 meter antenna is an Inverted L. This system is generally good on 80, 40, 20, 15 and 12 meters. •NECOPT – Developed at Penn State and very general to optimize just about anything on an antenna and the kitchen sink too. This antenna is 58 ft tall and is mounted on a hinged base. Advanced Search 20 meter dipole balun. The 80 meter wire will be used as inverted L and will extend from the top of the mast at around 11 meters away from the mast for the additional length of the wire. I have to shorten it. The antenna displays a low feed impedance, which allow you to feed it directly with 50-ohm coax cable. Like all inverted vees, it requires a single center support, which is often times a tower which is topped with a Yagi or quad for the upper bands. 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. Here's a simple antenna which will get you on the air on top band and 80m (40m as well at a pinch) in a small garden. This simplified arrangement has several advantages, including a shorter ground distance between the ends. Comparison to an inverted-vee The simplest alternative to this antenna is a loaded inverted-vee with leg configuration similar to that of the half-sloper wire element. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. But my loop sloper is a blast to work with! It packs a lot more punch albeit only southward. The inverted Vee antenna will be shorter by 2 - 5% depending on the angle from horizontal. Since I have a small lot a full size 80 meter dipole just will not fit on it. reactance of ~580 ohms on 160 meters. I find the antenna simple, inexpensive, and easily concealed. See updated video. Not having a lot of room for 40 meter beams, I decided to use the space I do have, which is a long wooded fence in the backyard. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] Of course you must keep the end of the antenna high enough above ground, such that humans and animals will not be harmed by the high voltage on the end of the wire. See updated video. Marconi Inverted L G7FEK Design. My L-antenna against the night sky. The Inverted "L" and Sloping Wire configurations are excellent general-purpose antennas and are a good choice when two supports are available (for the Inverted "L") or one support (for the Sloping Wire) and there is sufficient time for site selection and installation. An inverted "L" is a form of bent. It's an ideal antenna for those of you who do not wish to use a tower and beam. The solution was an 80 Meter Inverted L it performes better than the S9 vertical does for 80 meters. Good for local contacts. Electromagne2c' Wave'Polariza2on' • Electric'and'magne2c'waves'are'at' right'angles'to'each'other' • Magne2c'wave'dissipates'within'a' few'wavelengths'of'antenna. Remember you have to do the same amount to both sides ! Once the SWR is good for the 40 meter band, you can test 20, 15, 10 and 6 Meters. The vertical portion of the antenna is about 30. Super Expedient Stealth 160 Meter Antenna. You will love this antenna if you are unable to put down a proper ground system. 88) should also work well. Mike Newland. Designed with corrosion-resistant aluminum tubing, this 32-foot tall antenna is very durable and attractive.