E, to requirement of a friend radio ham, I responded to a question that considered referring to a information of an antenna of reduced dimensions for 80 and 40 Meters, offering him my personal experience in this subject that in principle are, in my opinion, quite extensive. 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. Table 2 shows the results of my Inverted-Vee calculations. Let’s try this first with a 40m inverted V. Most of what I did over the years was Morse - I have log books full of contacts on 80 Meters. Trimmed it using MFJ259, and got it to resonate at 3. 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. The antenna will be used in the Inverted-V configuration. In fact, if you intend to install an inverted V, the antenna calculator above will give you a wire length which will be 5% longer than that of a dipole at the same desired frequency of operation. None of these "fixes" are likely to make an antenna work better, and all will change the resonant length, but they will often make an antenna fit the space available and get you on the air. With my antenna tuner I can tune the inverted L for an acceptable SWR on all bands 80 meters to 30 meters though the radiation angle would be very high. Cebik, W4RNL 80 Meter Inverted Vee From GERRY VE3GK 80/40 Super Loop Antenna 80 Meter Antenna-- Reduced Size For Small Lots: 40 Meter Antennas: 40M Shortened Loop-- By Ben Smith, W4KSY Via Antennex WB0NNI 40 Meter Linear Loaded Vertical. A coil-loaded 40/80/160 meter inverted V dipole antenna. I have the radio, power supply, and antenna tuner (if required) mostly narrowed down but am uncertain about antennas. Each side of the dipole is broken up by a coil that presents a high impedance at. dqwhqqd v\vwhp zrunv zhoo lq krul]rqwdo vorshu dqg yhuwlfdo frqiljxudwlrqv 2evhuyh hvwdeolvkhg vdihw\ sudfwlfhv zkhq zrunlqj zlwk dqwhqqdv dqg dyrlg sur[lplw\ wr srzhu ru xwlolw\ zluhv 3hupdqhqw lqvwdoodwlrqv vkrxog eh htxlsshg zlwk dssursuldwh vwdwlf dqg oljkwlqj surwhfwlrq. Sloping Dipole Antenna 11 16. No change was made to the 80-meter dipole or the transmission line. ALPHA DELTA DX-DD "No Trap" 80 and 40 Meter Dipole or Inverted V Antenna. Several weeks ago I received a message from John Amodeo, NN6JA the Producer for ABC's television show "Last Man Standing. As the elevation pattern shows, most of the radiation is above this angle. Distributed feed bi-square on 80 meters, apex 200 feet:: With the antenna at 200 feet apex height, we now have about the same gain and pattern as a dipole at 150 feet. Many know what to expect from a dipole, I will try to compare this allrounder theoretical and practical with a shorted VERTICAL dipole antenna which can be set from 10-40 meter. 82 - 300ohm-Ribbon. 42 Antennas, 80 Meter Yagi, How To Build A Relatively Small 2-Element, CQ 1998, Jun. Coil Loaded 4080 Meter Inverted V Dipole Antenna This 40 And 80. There are mods for 160m and it might even work on 6m with some tuning. On the ham bands they will handle a full 1500 Watts when trimmed to frequency. Dipoles have a feed point of about 75Ω in free space, and can be fed with 50Ω to 75Ω coax with or without a 1:1 balun. Horizontal Polarization on 80 Metersprovides6 dB of "free" ground gain. I have to shorten it. 93 one side. This antenna is constructed from odd bits of coaxial cable, PVC pipe and assorted hardware from your local CT store, and works very well on 80 metres. The ½ wave Inverted "L" antenna, with Hi-Z feed point requires only a minimum ground to be an effective radiator. Page update of 7 August 2019. 9MHz for example) to find the overall length of the aerial, which is composed of H (Horizontal) + V (Vertical) components. The radiation resistance an inverted V changes depending on its height above the ground. It has been surprisingly efficient. It's an 1/8 wave vertical on 160 meters also. I don't know. The antenna was designed for military use from 2 to 10 MHz (some references say 2 to 30 MHz). 135 feet (45+90) long. 2 DXE-ECL-060 Element Clamp for 3/4 and 7/8 in. The large diameter yields broadbanded coverage of the 80 Meter Band. 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 80m/40m antenna is my own design. On 80m, I have worked across Europe and a station in the USA. Even inverted V's can be sloped. The measurements below are for building a simple Dipole Antenna. For a balanced dipole on 80-meters, G5RV Max (204') is available. Use nylon cable ties to secure the feedline to the insulated supports. Find great deals on eBay for 80 meter antennas. For example, a dipole antenna for the 80 meter band requires a ground length of about 140 feet (43 m) from end to end. The original was for 160 meters and I cannot say a bad word about the antenna. Shown here is an Inverted-L with its long leg sloping to the ground. 80 Meter CW was pretty reliable. It's an ideal antenna for those of you who do not wish to use a tower and beam. This feature is not available right now. 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. Gerben Ruessink. The 40/80/160 Meter Coil-loaded Inverted V Dipole Antenna See all details: Link. At my QTH i use this antenna in a flat top configuration, you have seen this above. Horizontal dipole or inverted-V dipole 50-70 feet high. • Inverted L (Good) –Go straight up as high as you can with a wire, then bend the remaining wire to run horizontal to resonate it • Tee vertical (A bit better than L) –Like an inverted L, but the top is extended in opposite directions. I installed the 80 meter double bazooka as per the instructions and instantly noticed a huge improvement over my Alpha Delta DX LB. An Inverted-Vee antenna is typically defined as having an included angle of 120 degrees or less, down to. Notice: Undefined index: HTTP_REFERER in /home/forge/theedmon. I don't know. A low frequency dipole (80/40 meters) can be put up to within 10 feet or so under a higher frequency (20/15/10 meters) beam with little if any problems. Distributed feed bi-square on 80 meters, apex 200 feet:: With the antenna at 200 feet apex height, we now have about the same gain and pattern as a dipole at 150 feet. Dipoles have a feed point of about 75Ω in free space, and can be fed with 50Ω to 75Ω coax with or without a 1:1 balun. The thicker a dipole wire is (relative to its length), the wider the bandwidth. The military uses a dual band NVIS antenna known as the AS-2259/GR. The solution : build an antenna for 40 and 80. It may be even harder on 80 meters because everyone has a strong signal. Extended double Zepp is: 349. Random Wire Antenna Lengths. The center is high in the air with both ends or legs of the Dipole heading towards the ground on a 45 degree from center. port for the pushup mast, I pur-chased a portable antenna tripod. The antenna I use is rather simple. The 160-meter coil plus an 80-meter mobile antenna were placed at the far end opposite the feed point. 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. 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. We had great weather, a good turn out of Club members, and lots of visitors. In this paper, we present an experimental and simulation based study to evaluate the use of full-duplex as a mode in practical IEEE 802. On HF, one of the factors that determine how far your signal goes is the takeoff angle. Only at eHam. The antenna works on the bands as advertised with low SWR. , extreme low or high impedances) at the tuner end, on all bands. Several weeks ago I received a message from John Amodeo, NN6JA the Producer for ABC's television show "Last Man Standing. Since we now have a new NVIS inverted Vee antenna based on the Buddipole, we call it the Buddipole N-Vee!. 80/75 Meter Wire Antennas Halfwave inverted V is: 134. This is a good antenna for limited space and height. 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. 9MHz for example) to find the overall length of the aerial, which is composed of H (Horizontal) + V (Vertical) components. Radiation Pattern 80 Mx @ 35 feet 90 deg - Inverted V. Although this is not a DX antenna, there is plenty of useful radiation for all kinds of excellent 80-meter QSOs. Horizontal, Vertical, Slope, Inverted V etc. that would put the Inverted-Vee configuration at a disadvantage on 160 meters. This of course is ideal for matching the antenna to standard 50 ohm impedance coaxial cable. 80/160 instructions follow Ham Radio Pair of Antenna Traps 80/160m Low Swr. “SAFARI” INVERTED V ANTENNA - G3RWF Text in italics were summarised from Mercury No. You can spend about $25 to turn the Jackite 31′ pole into an all-band HF Antenna that will give you all bands between 80 and 10 meters, without a tuner. complete kit antenna in stock and ready for shipping now on the internet. The military uses a dual band NVIS antenna known as the AS-2259/GR. Horizontal dipole or inverted-V dipole 50-70 feet high. com/public/mz47/ecb. The 80 meter inverted vee is a common and classic antenna. 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. Innovative Wideband Techniques in Antennas 80 Meter OWA Dipole 1 1. Table 2 shows the results of my Inverted-Vee calculations. HF 2 band Fan dipole multiband antenna 80-40 meters with 1:1 Balun This antenna can be hung either in a Flat-Top or Inverted V configuration. DUAL BAND DOUBLE BAZOOKA. This 40 and 80 meter inverted V antenna is made with loading coils. 55; Save 80 meter dipole to get e-mail alerts and updates on your eBay Feed. 87 feet 174. Ensure it works in the Inverted V configuration. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. I wanted high efficiency 40 Meter antenna with low-angle radiation. 5 foot level off at a 90° angle to form the flat portion of the inverted L. I haven't tried it but I have used an inverted V in a fairly classic configuration hanging from a tree with an ugly-balun in the middle and that worked really well. 80 meters of fiber would need to be incorporated. With my antenna tuner I can tune the inverted L for an acceptable SWR on all bands 80 meters to 30 meters though the radiation angle would be very high. Covers all bands, 160-10 Meters with antenna tuner. 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. The 40 meter length that I used is 33' 3-1/2" (10. I used my old trusty aluminium push up mast to get to a height of 10 or 11 meter. One separate dipole for each band. I then proceeded to make several contacts and received outstanding signal reports. Any full length wire will enhance. 5 inch tubing. Fig 6 shows the result of adding a 40-meter dipole to the Fig 1 antenna. Use nylon cable ties to secure the feedline to the insulated supports. If an antenna performs like an inverted-L, then it belongs to the same family of antennas, whatever family name we might concoct. I have no illusions about the feasibility of DX antenna. Results from SWR analysis done by EZNEC. 88) should also work well. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. Bandwidth: An inverted-V dipole antenna has a higher Q than a simple dipole so it tends to have a narrower bandwidth. With this I can tune to any band from 10 meter to 80 meters. Note that the SWR on 80 meters changes very little compared to Fig 2. 82 - 300ohm-Ribbon. 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. In this paper, we present an experimental and simulation based study to evaluate the use of full-duplex as a mode in practical IEEE 802. Gerben Ruessink. The inverted-V was made of #18 AWG teflon insulated wire, and I used miniature RG-174 coaxial cable for the feedline. Dipoles have a feed point of about 75Ω in free space, and can be fed with 50Ω to 75Ω coax with or without a 1:1 balun. I spread the tripod legs to about 40 inches apart and locked them in place. This system is generally good on 80, 40, 20, 15 and 12 meters. 9MHz for example) to find the overall length of the aerial, which is composed of H (Horizontal) + V (Vertical) components. Does anyone know if a fan type dipole in an inverted vee configuration can be made for 80, 40 and 30 meters? And, if so, how the addition of other bands affects the performance over a single dipole. For a while, I was blessed with living at a home where I could raise the parallel dipole about 70-75 feet and stretch out a full length 80 meter dipole. nl 1 HyEndFedAntenna Thank you for purchasing the 200 Watt HyEndFed multiband 80-40-20-(15)-10 meters band antenna. As a first try, I ran some 17 gauge aluminum electric fence wire from the side of the house closest to the "hamshack" out to a handy tree about 20 meters or so away from the house. EFHW-8010 Multi-Band End Fed Half Wave Antenna. Dipoles have a feed point of about 75Ω in free space, and can be fed with 50Ω to 75Ω coax with or without a 1:1 balun. Background:. Half wave dipole - inverted V configuration (approximately -4. 20/40 Dual Band Dipole This is a simple dipole built for two-band operation that I made for portable use with my 20 and 40 meter QRP rigs. The trap is placed at approximately the 31. On 160 meters you should see about 110 kHz bandwidth. In the first two columns, the antenna's height above ground is given in wavelengths and in feet. 87 feet 174. A coil loaded 40/80/160 Meter Inverted V Dipole. Description. 142 article My efforts are all about minimum weight since I need to get it on a plane fro my Safaris. Download the Ground Plane/Dipole/Inverted V Calculator by N2IMF. The superior Full Size G5RV comes fully assembled & ready to go. and 10 meters, and the other covering 80, 40, 17 Trap operation, all turns are used, in the con- ventional manner for a trap. The Wire Size can range from 16 AWG to 12 AWG. Dimension "A" is the height of the antenna from the base to the apex, not the length of each of the vertical wires. Brand New. 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. 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!. Gerben Ruessink. ANTENNA MORGAIN 40/80M Hello to all. NVIS was most certainly the rule for 80 and 40 this contest. Add coax feedline -- get on the air! The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. DX-A - 160-80-40 Meter 1/4-wave Twin Sloper - A top low frequency DX antenna. Don't forget about 60 meters and 17 meters or the WARC bands. Courtesy of and designed by N2IMF Joseph R Mielko This downloadable calculator will provide you with good starting measurements for a basic ground plane, Inverted V or standard Dipole antenna. The inverted-L is a compromise vertical that works pretty fair if you dont have the ability to get the entire antenna vertical. This ham radio coil-loaded 40 and 80 meter inverted V dipole HF wire antenna is easy to build! Loading coils make this antenna a full size on 40 meters and a. A dipole can also be strung up in an «Inverted Vee» configuration. With this I can tune to any band from 10 meter to 80 meters. Brand New. While an inverted V is mostly omni-directional, this will allow for the lobes of strongest radiation to be east & west. Note that 44 + 25 equals about a quarter wave for 80 meters if used as an inverted L antenna. To briefly recap, this is 4-band inverted vee with parallel wires for 30, 20, 17 and 15 meters, and that also resonates on 10 and 6 meters. How to build a mono band 80 meter 1/2 wave wire antenna. Wire dimensions supplied. Dipole/ Windom Antenna OCF8010E-3K 80-10 Meters Rated at 3KW DD "No Trap" 80 and 40 Meter Dipole or Inverted V. I don't know. One of the aims of DXers is long distance contacts and they will often go to great lengths to have a low angle of radiation. wavelengths over the ground at these frequencies, but much harder to push an 80-meter wire up that high. Many hams encounter problems in erecting just one antenna, so the thought of needing antennas for five bands seems out of the question. edu is a platform for academics to share research papers. Inverted Vee This is just as it sounds, an inverted or upside down "V" shape. Four basic NVIS antenna configurations: Low Level Inverted “V” One antenna configuration that applies the NVIS strategy is an inverted “V” antenna mounted approximately 15 feet above ground at the center and 8 feet above ground on the ends of commonly feed 40- and 80-meter diploes. Some hams call the relatively low dipole a cloud- burner. 40 Meters Wire Yagi - Inverted Vee Elements A wire yagi made with dipole elements has the disadvantage of requiring multiple supports. An inverted V with an apex at 100ft is a good start but if the ends droop very much towards the ground the efficiency will also start tapering off. Note that the SWR on 80 meters changes very little compared to Fig 2. Time will tell how this effects local Tx/Rx on 80/75 meters however DX should improve some. After operating 80 meters at Frank's place, just about anything else is a disappointment. I am considering the Comtek 40VA 40 Meter vertical antenna, from DX Engineering, for the elements of the two element 40 Meter array. 580 (psk freq. One separate dipole for each band. Overview - This version of our OCF (off-center fed) Dipole Antenna available in either 6-40 or 10-80 meters and is uniquely designed around a specific Alpha Antenna balun, which is based upon the dual core 4:1 Guanella balun. This antenna benefits from being rasied as high as you can get it. Running an inverted V or center fed dipole will place the feed point too far from the house and will present other problems with where the coax would come down. 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. “SAFARI” INVERTED V ANTENNA - G3RWF Text in italics were summarised from Mercury No. Common mode RF chokes are described in detail in another page of this site on the "classic" ham radio dipole. Construction & Working of Inverted V-Antenna. The 20 m folded dipole as a Inverted V. It has now been converted to cover 20m as well as 40m (with 15m on third harmonic of 40m). Total set-up time for the antenna and radio this second time was less than twenty minutes. 95 Amateur Wire Antennas The MFJ-17758 is a two band, 80 and 40 Meter center-fed dipole antenna capable of handling 1500 watts. "An inverted vee antenna is a modified dipole antenna supported in the center with the ends lower than the center. The capacitor between the antenna and radial junction is replaced with a tapped coil. W4RNL Antenna Theory. 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. Use on 160 Meters as Marconi with tuner and ground. I have been wanting to put up an antenna for 160 meters, but have space restrictions. Closer View of the Ogden Receiving Site Tower Shows various antennas mounted on the tower that supports the 80-meter inverted-v dipole normally used by JimAndLeah's Online Tuner. My friend Jerrie - KD5KD has been using an antenna like this with great success on his Navy MARS net which is near the 80 meter band. 8 2 40m Inverted-V Different Line Matching Impedance. The inverted-V is defined by overall antenna length, straight-line distance between wire ends and height of wire ends above ground. The inverted Vee antenna will be shorter by 2 – 5% depending on the angle from horizontal. 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. The inverted-V is defined by overall antenna length, straight-line distance between wire ends and height of wire ends above ground. Common Mode RF Chokes For The Ham Radio HF Antenna. 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!. 468 ÷ freq (mHz) = Length (feet). superb Sweepstakes and Field Day antenna. It really doesn't matter as long as it is longer than 1/2 wavelength on the lowest band I want to use. Brand New. 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. Inverted v From all the available options the inverted v looked the most promising as it requires only one mast (as the end fed does), while you can still operate with a "full size" antenna (1/2L in this case). About a third of the size of the whole US if you lay it over it. It's im- portant to keep the antenna ends high enough above the ground so that people, vehicles and such can't come into acciden- tal contact with them. made from paint can lids. 80m Antenna for small gardens. Use the formula: 492/fMHz (259. Coil Loaded 4080 Meter Inverted V Dipole Antenna This 40 And 80. I did make some changes from the original design to the lengths of the antenna elements. The apex of the antenna was around 400 feet high with legs going up and coming down several hundred feet long. Radiation Pattern 80 Mx @ 35 feet 90 deg - Inverted V. Accommodate coax lines with an L-Network match. An example will serve to illustrate. To briefly recap, this is 4-band inverted vee with parallel wires for 30, 20, 17 and 15 meters, and that also resonates on 10 and 6 meters. No Trap 80 and 40 Meter Dipole or Inverted V Antenna Due to the fact that the Alpha Delta DX-DD antenna approximates a half wave dipole (although greatly reduced in length), the method of mounting or installing it does not present some of the problems associated with other types of antennas. 81 - Inverted-L for 160m. I prefer a 160-meter inverted V to a horizontal dipole at heights less than 100 feet. The Inverted V - Multiband Antenna for for 80, 40, and 30 Meters The inverted V antenna is essentially a dipole antenna that is about 5 percent shorter than a standard dipole, and slopes toward the ground, rather than being parallel to it. Horizontal dipole or inverted-V dipole at least 70 feet high. It is simple to make and cost can be nearly nothing. ARRL Emergency Communications News Letter One of the great benefits of ARRL membership is the ability to receive several informative newsletters, which cover a broad spectrum of interests, ranging from […]. For a compromised antenna system, it performed as well as my 80 meter inverted vee. We will take an inverted V for 40 meters, an antenna which is widely known amoung HAM's as an allround antenna. Horizontal Polarization on 80 Metersprovides6 dB of "free" ground gain. 80/160 instructions follow Ham Radio Pair of Antenna Traps 80/160m Low Swr. The antenna can be installed as a "flat-top" or an inverted "V". I have the radio, power supply, and antenna tuner (if required) mostly narrowed down but am uncertain about antennas. This led to my first 80 meter inverted vee web page. Inverted v From all the available options the inverted v looked the most promising as it requires only one mast (as the end fed does), while you can still operate with a "full size" antenna (1/2L in this case). The inverted v would also be a candidate configuration for an 80m antenna. The 80m/40m antenna is my own design. Dimensions calculated by the program are the height above ground of the triangle's apex and the angle it subtends. Description. On 75 and 80 meters, you should have about a 220 kHz bandwidth. 10-80 Meter Vertical Antenna INSTRUCTION MANUAL General Description The Hy-Gain Model 18V-S is a trapless, vertical antenna which is manually tuned to any band, 10 thru 80 meters, by a simple adjustment of the feed point on the base inductor. DX-A - 160-80-40 Meter 1/4-wave Twin Sloper - A top low frequency DX antenna. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. , the other 55 ft. But none of them were really that much more effective than a plain inverted V at 150'. ANTENNA MORGAIN 40/80M Hello to all. 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. This antenna, the Alpha Delta DX-B, is a trapped, quarter wave single wire sloper for 160, 80, 40 and 30 meters and has been installed at the 55' level and slopes to about 25' off the ground. For the last few years, I have been the 80 meter CW op at W3LPL for the CQWW and ARRL DX contests. 2 Meter Yagi Antenna w/ Gamma Match Dipole and Inverted V Antenna Basics 10/15/20m Trap Vertical Antenna Dave Tadlock helps you build a home brew trapped vertical Inverted V Calculator thanks to k7mem Martin E. Courtesy of and designed by N2IMF Joseph R Mielko This downloadable calculator will provide you with good starting measurements for a basic ground plane, Inverted V or standard Dipole antenna. 81 - Inverted-L for 160m. 80/75 Meter Wire Antennas Halfwave inverted V is: 134. MFJ-17758 80/40 Meter Dipole Instruction Manual 1 The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. 80 meter beam Vic, your three element inverted-vee Yagi-Uda will have gain over a single inverted-vee, even if the Yagi is not very high. Measured VSWR in the gallery are taken with an antenna in an inverted V shape with the center of wire at 20 feet and ends a few feet above ground, your values could vary with way and height of installation. 2 MB) Time Domain Reflectometer (900 kB) 2 Meter Homebrew Mobile Antenna (2. You can build the antenna in inverted V but it will be less efficient. Using a tuner near the transceiver with a coax fed too short antenna is not the solution. If an antenna performs like an inverted-L, then it belongs to the same family of antennas, whatever family name we might concoct. On 20m you may find it radiates best broadside to the wire and less off the ends - this seems to match what I have found. It's Monday (March 11) and this needs to be done by Friday (March 15). Congratulation you QSO with many Ja's from here FL is the longest distance Point within US mainland. 9MHz for example) to find the overall length of the aerial, which is composed of H (Horizontal) + V (Vertical) components. The antenna is resonate on both bands. Inverted Vee : Full Half-Wave Inverted Vee : Over level ground, the minimum height for the apex (feedpoint) of an Inverted Vee is determined by the angle (downward slope) of the Vee legs. 468 ÷ freq (mHz) = Length (feet). Until recently, my tower supported a pair of phased 40 meter delta loops. This simplified arrangement has several advantages, including a shorter ground distance between the ends. Place a 1:1 Balun on the Antenna end of the Feedline. While an inverted V is mostly omni-directional, this will allow for the lobes of strongest radiation to be east & west. Note that the SWR on 80 meters changes very little compared to Fig 2. Equipment for portable HF operations, 2 able to sustain 500 watts PEP between 6 and 80 meters. , the other 55 ft. Order #4825 List Price: $99. The antenna can be installed in an inverted V configuration keeping in mind that this design changes the feedpoint impedance and will tune differently. Table 2 shows the results of my Inverted-Vee calculations. They also have an omnidirectional radiation pattern. net is a Web site dedicated to ham radio (amateur radio). dipoles and inverted Vs are fine for local for 80 meters on top of, or under, a grass The N4GG Array Need a simple, nearly invisible wire antenna with. The antenna is installed and works at three ham station- UR4LRG, UT5UY and Kharkov club station UR4LZZ. I used my old trusty aluminium push up mast to get to a height of 10 or 11 meter. The Wire Size can range from 16 AWG to 12 AWG. 20 meters and 10 meters are mechanically between the 80 meter top and 40 meter bottom. Ogden Remote Receiving Site Antenna JimAndLeah's OnLine Tuner normally uses an 80-meter inverted-v dipole supported by this tower. The problem I ran into in making those calculations was with the size of the antenna. 80 Meter CW was pretty reliable. I made an inverted L for 80 meters. For the 10- through 40-meter bands, you will have less than a 2:1 SWR across the entire band. Any 160 meter mobile antenna will have very poor efficiency, perhaps as low as. The 40/80/160 Meter Coil-loaded Inverted V Dipole Antenna See all details: Link More information Find this Pin and more on Radio antenna by Lewis Burmeister. I have heard dipoles work great at 20 feet in the air. If you like an inverted-vee and you want 6 dB of gain put up the 3 element antenna. The Jackite vs Ebay pole comparison showed you how you can spend a few bucks and get a good single or dual band HF antenna. The antenna is resonate on both bands. 20 meters and 10 meters are mechanically between the 80 meter top and 40 meter bottom. Half wave dipole - inverted V configuration (approximately -4. The antenna is resonate on both bands. This is a little page with lots of pretty pictures and graphs about my dual inverted V antenna for 40m. Using the accepted formula of 468/f, the length of a dipole. ALPHA DELTA DX-DD "No Trap" 80 and 40 Meter Dipole or Inverted V Antenna. It's an 1/8 wave vertical on 160 meters also. It's an inverted V dipole, 2x13 meter for 40 and 80 meter. Horizontal dipole or inverted-V dipole 50-70 feet high. What is the best way to hang an off-center-fed dipole or windom antenna as an inverted-V? Should you hang the feedpoint at the apex, or hang the center of the antenna at the apex? From an electrical standpoint the best way is to hang the center at the apex. 80/40 Meter Vertical From EI7BA 80 Meter Vertical (Half length) Monopole From L. Inverted Vs usually work almost as well as horizontal flat-top dipoles when the dipole's height is the same as the feed-point height of an inverted V.