40 80 Meter Inverted V Dipole Antenna



The Russians have always had a special love for 41 meter AM broadcasting. Total set-up time for the antenna and radio this second time was less than twenty minutes. A half-wave dipole is strictly speaking a monoband antenna, although a. Dipole or Vertical? Tom Thompson WØIVJ Note: This posting uses hyper links extensively. Covers all bands, 160-10 Meters with antenna tuner. The noise floor was at 0-super quiet so I figured it's because you have no 40 meter antenna dummy. Remember as with all antennas, be safe and use your head. Yes, I have a trapped V that I can use on 80, 40 and up to even 6 metres but I didn't really like the concept of multiple antennas and switching coax feeders. ELEMENTS MAY BE ADJUSTED FOR OPTIMUM RESINENCE FOR EACH BAND. He mentioned that they needed a similar antenna to get them on the air on 75/80 meters at the CBS Studio Center. Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. Dipole begin with sections for 20m. Buckmaster 7-Band 300 Watt OCF Dipole Antenna (Click for larger image) Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters , with no tuner required! Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. Each version of the antenna deserves its own data so that we do not inadvertently introduce misleading performance ideas. I haven't heard of any that can make that boast. Dipole antenna projects for the 40 meter band is a curation of 42 resources about , Shortened Dipole for 40m, W5VMs Shorty 40 Antenna, The 40 Meter Inverted V Antenna, 40 meter cage dipole, Simple 20-40 m Dipole Antenna. For the last 35 years or so I have been a 40 meter CW specialist for Field Day. The inverted-V works quite well considering that I have a single story ranch style home and the center feedpoint is only about 15 feet above ground. Everyone in the local area was very surprised that a 4 watt radio and dipole antenna could perform so well locally. The center insulator is two-part PVC with a top eyelet for hanging the antenna (as in an inverted-V configuration) and has an SO-239 for connecting any PL-259 equipped coaxial cable. Buckmaster 7-Band 300 Watt OCF Dipole Antenna (Click for larger image) Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters , with no tuner required! Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. The basic formula for determining the wire length of a center fed, 1/2 wave wire dipole or inverted Vee antenna is: 143 ÷ freq(mhz) = Length(metres). Anyway, I guess the 20 meter dipole will be used only for 20 meters. The 40 meter gain is now 13. perpendicular to the dipole for at least 1/4 wavelength • Avoid running the dipole parallel to long conducting objects such as aluminum gutters. I was also concerned about what the neighbors might say if I installed too. Here's an easy, inexpensive way to add the 80 meter amateur radio band to your existing 40 meter dipole antenna. Another well-produced, easy-to-follow antenna tutorial from Dave Tadlock (KG0ZZ). A second, lighter, multi-band invert-ed-V covering 10m. It's a great HF antenna for the ham radio operator with a smaller backyard! The. The MFJ-1778 (G5RV) consists of a 102 foot flat top fed with a 32. Can be hung Flat or inverted V configuration. If you compare a flat top 80 meter dipole at 50 feet with an inverted vee with top at 50 ft and ends at 10 feet, the flat top dipole will be 2 to 3 dB better at all elevation angles, broadside to the antennas. Here's another great antenna idea for the upcoming 2017 ARRL Field Day Event on 24-25 June 2017. Ver2cal'Wire'Antenna' • Actually'a'ver2cally'orientated' resonate'1/2'wave'dipole'with' the'earth'being'the' return ' half' • Due'to'poor'ground' conduc2vity'a. 1kw CW/PEP remaining bands. For 17, 20 and 30 meters I set up at the inner feedpoint. Obviously this should not have been a surprise, hihi. *For this article a vertical refers to a 1/4 wavelength, ground mounted antenna with 1/4 wavelength radials. 160m Inverted Delta Loop. Rig is an Elecraft K3; using Bencher paddles. 84 - Mini-Horse Yagi Antenna. I used the antenna in this configuration for a couple of months and also experimented with an inverted V configuration with good results as well. A Portable 75/40* Meter NVIS Antenna - with 3/2/'09 updates - by David B. How to make a ham radio coil-loaded meter inverted V dipole hf wire antenna. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. 16 feet over all. Dipole or Vertical? Tom Thompson WØIVJ Note: This posting uses hyper links extensively. The antenna apex was about 25′ above the ground and the legs in a sloping inverted V configuration coming down to about 10′ above the ground. It is good for medium range contacts. I now have individual 80 and 40 meter NVIS antennas. Until recently, my tower supported a pair of phased 40 meter delta loops. HF 160 +80 + 40 METER HAM RADIO DIPOLE WIRE ANTENNA w/ WA1FFL LADDER LINE LOCK. Inverted V dipoles (or any dipole for that matter) work well as a DX antenna when they are 1/2 a wavelength or more high. A typical horizonal dipole for 40 meters would look like this;. Hf Radio Dipole Antenna Radios Long Distance Radio Amateur Ham Radio Antenna Radio Stations Diy V-U Antenna J-pole. The other thing is that the Low Bands Challenge is only for 40, 80 and 160 metres. Just as a starting point, NEC2 was used to calculate the feed point impedance of an inverted V antenna, with a 30 degree droop, with the apex 10 meters above finite ground (epsilon=15, sigma =. Trimming a dipole antenna refers to the adjustment of antenna length to operating frequency. As with any flat half wave dipole, the feed point is about 72 Ohms. 468 ÷ freq (mHz) = Length (feet). The V-beam antenna is the first part of a rhombic antenna. As the photo below shows, with nearly 5½ meter (18 ft) span, the dipole is a "little" wide for my terrace. Dipole, Inverted V and Ground Plane Antenna Calculators Online and downloadable Dipole, Inverted V and Ground Plane Calculators. This time, Dave designs, builds, and uses a coil loaded 40/80/160 meter inverted V antenna. The inverted V dipole antenna has a number of advantages. Dipole Antenna. Since I now have a resonate antenna for 40 20 and 10 meters I shortened up the lenght of the inverted L until i found a resonate spot in the lower portion of 80/75 meters that would allow me to bypass the tuner when operating within that window of the band. So I don't have alot of time in the hobby. After several very windy days here the antenna still is a great performer. 80-40m loaded dipole. Everyone in the local area was very surprised that a 4 watt radio and dipole antenna could perform so well locally. Since an 80 meter dipole is approximately 130 feet long, and a 160 meter dipole is approximately 250 feet long, this space reduction can be critical in getting the antenna to fit into our. The noise floor was at 0-super quiet so I figured it's because you have no 40 meter antenna dummy. 78 - Fan Dipole Antenna for 80m to 6m. Length is 100 feet. No antenna switches are needed, the RF knows where to go. My other antenna is an Inverted 'T' (A Suspended Quarter Wave 40 Meter Wire Vertical Monopole. 40 Meter Ham Radio Dipole Inverted V Complete Wire Antenna Kit 1500 Watt RW-DP40 ALPHA DELTA DX-DD "No Trap" 80 and 40 Meter Dipole or Inverted V Antenna. In order to show the connection of the dipole antennas of the legs 51 and 52, a four row dipole antenna configuration 65 is singled out for purposes of description. When set up as an inverted-V the center of the dipole is lifted up and the wires of the dipole are sloping downwards. It uses #14 7/22 stranded hard-drawn copper wires to meet the requirements of the National Electrical Code and have the best radiation efficiency. Inverted V Dipole feed point impedance. You could also use it as a sloper or in an Inverted-V formation if you have limited space. Total length 66. The elements are full dipoles with a 1:1 BALUN. BUILD THIS MULTIBAND FAN DIPOLE FOR ALL BAND HF ANTENNA EXCITEMENT Here is a fairly simple and easy to build multi band horizontal fan type dipole that can be constructed for all band operation from 160 meters up thru 6 meters or even higher. Monoband HF Dipole Antenna (89,852 bytes, PDF file) QST April 1993, p. 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. I have the radio, power supply, and antenna tuner (if required) mostly narrowed down but am uncertain about antennas. 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. This coil-loaded inverted V dipole antenna is a resonate antenna that does not require the use of an antenna tuner. the antenna, which acts as a resonant λ/2 inverted-V dipole on each of the 20m, 40m and 80m bands. You can mount them high and away from the trees for better performance than a wire dipole. 80/40M Loaded Dipole, 90 Ft Long Compared to Full Size Half Wave Dipole • 40 Meters - No significant difference in gain or pattern - Slightly less SWR bandwidth • 80 Meters - No significant difference in pattern - Gain about 0. On 160 meters you should see about 110 kHz bandwidth. 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. Wide Band 40, 75, & 80 Meter Antenna The 80m/75m antenna and the 40m antenna are now down to a two wire "cage" each. and 10 meters, and the other covering 80, 40, 17 Trap operation, all turns are used, in the con- ventional manner for a trap. I gather I would use a tuner to get that dipole to work on all the bands down to 10 meters. I am use to using a external tuner for these bands, but my Yeasu FT450D had no problems with it's internal tuner to match any of the eight bands. My tower is in the center of my lot and is 60 feet at the peak, and is 40 feet to both ends of the lot. I read a nice article by A. Dipole or Vertical? Tom Thompson WØIVJ Note: This posting uses hyper links extensively. The half-wave dipole is very simple to construct. Use as a dipole, inverted V or upright V antenna configuration. For the 10- through 40-meter bands, you will have less than a 2:1 SWR across the entire 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 Sloper Antenna Explained The classic sloper antenna is a top-fed 1/4 wave vertical antenna sloping down and away from a tower. I wanted high efficiency 40 Meter antenna with low-angle radiation. Antenna Theory - Full-Wave Dipole - If the length of the dipole, i. For this reason the 40 meter section was left a little long so that when the 80 meter section is the correct length, the 40 meter section resonates on the desired frequency. The antenna was created for the 40 meter band and above. Using a tuner near the transceiver with a coax fed too short antenna is not the solution. It shows an inverted V-antenna mounted on a roof top. The total length of the dipole should be just under one-half wavelength for the operating band. The capacitor between the antenna and radial junction is replaced with a tapped coil. inverted-V installation, you may have to 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. This is a simple dipole built for two-band operation that I made for portable use with my 20 and 40 meter QRP rigs. 80-40-20 M dipole 80 40 20 Meter Dipole Array By KJ4EX October 2008 Recently I have installed three of these systems, all untuned, requiring the use of a tuner, but capable of operating on 80 through 6 meters. This antenna works as advertised. 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. Rig is an Elecraft K3; using Bencher paddles. Use 75 or 50 ohm cable to feed the centre of the dipole. 3:1 and under. Your noise levels seem to be excessively high. An antenna tuner is strongly suggested. *For this article a vertical refers to a 1/4 wavelength, ground mounted antenna with 1/4 wavelength radials. The direction of radiation is the Blue trace on the polar graphs. Obviously this should not have been a surprise, hihi. 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 ULTIMAX-8040 broadband dual band double bazooka for 40 & 80 meters is a fantastic antenna using a newly designed "HY-Q" coax coils that gives outstanding broadband performance on both bands requiring only 103' feet of space. The bread and butter antenna is a dipole at about 30’. So I don't have alot of time in the hobby. I could go with an inverted V cut for 40 with the top about 30 feet from ground, and each sloping along the side of the house, again about a foot or so away from the house. Loading coils make this a full size antenna on 40 meters and a shortened 80 meter antenna. *For this article a vertical refers to a 1/4 wavelength, ground mounted antenna with 1/4 wavelength radials. After several very windy days here the antenna still is a great performer. If you are searching for a master choice, for what it costs, you cannot beat a dipole or an OCF antenna. Your noise levels seem to be excessively high. Consequently, through all this my wife (N8YZI of 27 years) now thinks I have totally lost my mind, but I think I'll leave my 30 meter inverted vee antenna up for a while. With propagation favoring the lower HF Amateur Radio bands (160 meters through 40 meters), a combination 40/80 meter coil loaded inverted V dipole would make an ideal antenna for this annual event. It will deliver the same “God-Like” performance some ascribe to the simple AS-2259. Cut it for 20m and get a tuner. My other antenna is an Inverted 'T' (A Suspended Quarter Wave 40 Meter Wire Vertical Monopole. Tuning is carried out in the same way that you would tune a standard 40 meter dipole. BTW, the dipoles are in a sort of inverted V config. Here's another great antenna idea for the upcoming 2017 ARRL Field Day Event on 24-25 June 2017. Anyway, I guess the 20 meter dipole will be used only for 20 meters. VERTICAL ANTENNA if one has no space to put up a dipole or inverted V antenna, don't lose heart. 2 dBi Dipole Antenna in Free Space Use on 80, 40, 20, 17, 15, 12 and 10M with. At least the afternoon Hawaii net on 40 meters was workable. Background:. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled down to a 10 meter dipole with similar results. A dipole requests some place left if you tight it flat-top. An Inverted V dipole is only about 16 feet per side, easily small enough for my back yard. 050MHz, so λ/2 on 40m is 3λ/2 on 15m. You can mount them high and away from the trees for better performance than a wire dipole. Build an HF Ham Radio Dipole Antenna It is easy to build, construct and erect a dipole antenna for the HF bands: 160, 80, 40, 20, 15, 10 metres, etc using a few simple components at a minimal cost and get great results. The 80-meter amateur band covers a very large fractional bandwidth. 80-40m loaded dipole. This will give you the length of each leg of the antenna. The SWR is less than 1. A dipole fed with 300 ohm feeder can be used on all short wave bands. The OCFD is drooped over the 17' peak of the roof with the majority of the middle half of the wire running N/S, while the peak of the roof runs E/W. After trimming, the 80 meter elements were about 4 feet long for a total antenna span of about 76. The Fan dipole for 40/20/6m performs well. "An inverted vee antenna is a modified dipole antenna supported in the center with the ends lower than the center. The direction of radiation is the Blue trace on the polar graphs. No change was made to the 80-meter dipole or the transmission line. At the end of 2002, I was finishing up my 80/40 meter vertical array. This antenna is a full size on 40 and a shortened 80 by KG0ZZ. Antenna was originally a 66 foot (22+44 feet) horizontal with 25 feet of 450 ohm LL vertical. Last night I fired up my little yaesu 450D when everything was dead in 20 meters, I decided to see just what was there on 40 m band. Here's another great antenna idea for the upcoming 2017 ARRL Field Day Event on 24-25 June 2017. This morning couple of ZL's on 30m with good signal reports both sides, KH6 on 20m CW/SSB like a snap. I hope to improve my cw. 22 Different Wire Antennas. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end. I did 24 hour WSPR runs using 5 watts of power with each antenna on successive days. It shows an inverted V-antenna mounted on a roof top. 1kw CW/PEP remaining bands. I gather I would use a tuner to get that dipole to work on all the bands down to 10 meters. Since the antenna, of the Balun to each end of the dipole has 10 Meters I I advise to make with a strong and insulating material separators so that the distance between cables stays homogenous, putting the separators approximately each 50. An antenna tuner is strongly suggested. With propagation favoring the lower HF Amateur Radio bands (160 meters through 40 meters), a combination 40/80 meter coil loaded inverted V dipole would make an ideal antenna for this annual event. (OCF) Dipole •Based on the Windom antenna. Another well-produced, easy-to-follow antenna tutorial from Dave Tadlock (KG0ZZ). Dipole Antenna Calculator. Portable End-Fed 40-6 Meters Dipole Antenna Ni4L Dipole Antenna Description Small enough to fit in your glove box or your bug-out bag. 005), and 5 meter long legs (this happens to resonate around 14. Double Zepp - The Zepp is an end-fed 1/2 wavelength antenna that once was trailed from a Zeppelin airship. For example, a dipole antenna for the 80 meter band requires a ground length of about 140 feet (43 m) from end to end. 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. 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. 9 feet 40-Meter Inverted V 45 deg at 40 feet. Connected to the same feedpoint is the 20. and moderate gain over the entire 75/80- meter band. I do wonder though why the 20 meter dipole isn't being affected but the 40 meter ones are. The first online Dipole and Inverted V calculator on the page below has been around for many years and is designed as a simple "shortcut" so you will not have to do the math using the standard formulas for designing a horizontal dipole or inverted V dipole. Time will tell how this effects local Tx/Rx on 80/75 meters however DX should improve some. It's an inverted V dipole, 2x13 meter for 40 and 80 meter. Each side of the dipole is broken up by a coil that presents a high impedance at. NO3J - My first sprint. I have a 20 meter only inverted V in my backyard. First, I used a perfectly tuned 80 meter dipole to add the 40 meter antenna under. Ground ½ WL High Gain = 7. Overall length is 82 ft 1982MP End Fed, 1/2 Wave, 80-10M, 300W, Wire Antenna. A Crappie Pole 20 Meter Dipole. "Bguys I put this up but had site problems to install the 40 m section So I just put a 40 m trap 33 ft from the feed point and thereby incorporated the 40 meter section into the 80 meter length. Baluns: Choosing the Correct Balun. perpendicular to the dipole for at least 1/4 wavelength • Avoid running the dipole parallel to long conducting objects such as aluminum gutters. Handles power up to 100W of RF. 150MHz is 3 x 7. This antenna can serve as a backup antenna for the 2017 ARRL Field Day Event, set for 24-25 June 2017. End-fed horizontal wire, an EFHW. Remember as with all antennas, be safe and use your head. 5 across both bands. Connected to the same feedpoint is the 20. The ends and the supply. A good example of this would be a standard 40- and 160-meter dual-band dipole (2B4016) and an 80-meter full-size. Its best to do this with the antenna in the position that it will be used. 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… Video Rating: 4 / 5. The antenna is resonate on both bands. That R5 vertical had a nice sweet spot on 3. No-Trap 80 and 40 meter dipole or inverted-V. An antenna tuner can of course be used to increase bandwidth. 40 Meter Ham Radio Dipole Inverted V Complete Wire Antenna Kit 1500 Watt RW-DP40 ALPHA DELTA DX-DD "No Trap" 80 and 40 Meter Dipole or Inverted V Antenna. It works and it works quite well. I am interested in operation primarily on 160, 80, and 40. 8:1, followed by the 40 m wires then the 80 m wires. Also covers 30-17 & 12 meters with an antenna tuner. 1kw CW/PEP remaining bands. This antenna can serve as a backup antenna for the 2017 ARRL Field Day Event, set for 24-25 June 2017. 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. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled down to a 10 meter dipole with similar results. The antenna works fairly well on 30, 15, and 10 meters. HF Antennas for Small Gardens Modelling of my inverted L comparing with Inv V and Dipole to about 900 miles on 80 m. I haven't heard of any that can make that boast. Murray, KD1BL Author's Note: This article describes a 75/40 meter NVIS, but one could use the construction techniques to build just a 75 meter or a 40 meter version. 5 feet (including the coils). Whatever the book say, in practice the inverted V does not come up to the standard of a dipole antenna. Buxton, W8NX in QST July 1992 Issue. Since all antenna elements are resonant for their designed bands, no antenna transmatch (i. Antenna is working very good on 40/30m despite is only about 7 meters. A horizontal dipole or inverted-V dipole for 80 meters 35 - 70 feet high produces competitive results at 500 miles or more 100 feet or higher produces competitive results at 1000 miles or more A dipole 70 to 100 feet high is a very competitive single antenna A horizontal dipole and a small 2 element Yagi for 40 meters. Dave Tadlock. 80 meters at the high end around 3. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands with the exception of the lowest part of 80m. Then follows a trap and band 40m. By John Portune W6NBC. It utilizes an internal 9:1 UnUn and a BNC female antenna connector. This antenna is half as long as it should be for 80 meters, besides being handicapped by. At the least, a dipole should clear any sur- rounding buildings, and other large obsta- cles, for good performance. Find great deals on eBay for 80 meter antenna and 80 meter vertical antenna. version for 40 to 10 meters, the 67-70' version for the same coverage, the short 88' version for 80-10-meter coverage, and the 120-140' longer version for the same set of HF bands. It was fun even with not real great conditions. Place a 1:1 Balun on the Antenna end of the Feedline. For the last 35 years or so I have been a 40 meter CW specialist for Field Day. Coil-loaded 40/80 Meter Inverted V Dipole Antenna The loading coils used in making this antenna are from a diagram by IK1ZOY based on a project by I2CN. That meant building up a new portable antenna just for 160, 80 and 40 metres with frequencies around. 8 MHz, dividing 3. how high for a inverted v dipole for 10 meter. Oh…you can use the 40-meter dipole on 15-meters without modification. Inverted V is a popular and effective antenna and amateurs use it for 20, 40 and 80 meter working. 83 - Tri-Band Beam for 20m, 15m, 10m. Dodging AM heterodynes is what 40 meter Novice Operation is all about. the antenna, which acts as a resonant λ/2 inverted-V dipole on each of the 20m, 40m and 80m bands. 953 ohms Flat dipole length 33. Consequently, through all this my wife (N8YZI of 27 years) now thinks I have totally lost my mind, but I think I’ll leave my 30 meter inverted vee antenna up for a while. That meant building up a new portable antenna just for 160, 80 and 40 metres with frequencies around. A Portable 75/40* Meter NVIS Antenna - with 3/2/'09 updates - by David B. Inverted V dipoles (or any dipole for that matter) work well as a DX antenna when they are 1/2 a wavelength or more high. The total length of the dipole should be just under one-half wavelength for the operating band. The 80m/40m antenna is my own design. This would become my primary 40 meter antenna, and, I could take down my phased delta loops. The antenna was only about 6. Not worth the change; you’ll be disappointed. 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. A dipole fed with 300 ohm feeder can be used on all short wave bands. Dipole, Inverted V and Ground Plane Antenna Calculators Online and downloadable Dipole, Inverted V and Ground Plane Calculators. The following data are for the far field radiation patterns and 3D color views of an End Fed Half Wave Inverted-V antenna with the high point in the center at 40 feet and the ends about 10 feet over ground. Optimize antenna for use in a particular Amateur Radio Contest called the Virginia QSO Party. 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. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands only available with an antenna. How do we get back the 160 meter resonance? By placing a series. The DOUBLE BAZOOKA is 98% efficient and typically provides S. To support an antenna, I have no tower, and only two trees that aren’t too close to a house. for the 160 Meter Band. This will give you the length of each leg of the antenna. As the photo below shows, with nearly 5½ meter (18 ft) span, the dipole is a "little" wide for my terrace. Close proximity to ground causes significant loss. 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. Alpha Delta tests antennas, in the clear (no surrounding objects), at a height of 35 ft. "An inverted vee antenna is a modified dipole antenna supported in the center with the ends lower than the center. “Safari” Inverted V Antenna Project for a multi-band antenna for the 80, 40, 20, 17, 12, 10 and 6 meter bands, including a 1:4 impedance transformer and a. You can mount them high and away from the trees for better performance than a wire dipole. Depending on available trees/supports I can arange my antenna as an inverted vee, a sloper or a horizontal 1/2 wave. DUAL BAND DOUBLE BAZOOKA. This 40 and 80 meter inverted V antenna is made with loading coils. No-Trap 80 and 40 meter dipole or inverted-V. •20 meters and above or 80 meters and above W5GI Mystery Antenna All band dipole type antenna TV antenna 20 mtr 40 mtr 80 mtr. With a span of only 26m the antenna should fit into the smallest of suburban block. I've had good luck with endfed antennas on 20, 30 and 40 meters. If you look closely at the picture above you will see a wire dipole hanging from the tower. a 7-10m center mast and 2 skyhooks of approx. I am impressed with the performance but to be honest with you my 40 meter Inverted-V sometimes does better but then again sometimes it does not. Just click on the appropriate link to see a table or figure and use your back button on your browser to return. Since we now have a new NVIS inverted Vee antenna based on the Buddipole, we call it the Buddipole N-Vee!. 40M Inverted Vee As shown below, this simple antenna can be used in various configurations for 40/80/20 or any WARC band or a combination of them. It is a full size antenna on 40 meters and a shortened 80 meter antenna. No-Trap 80 and 40 meter dipole or inverted-V. The end isolator and spreader shown from a different angle. 1 to 1 on 30, 15, and 10 meters. Don't forget that dipole type antennas can be mounted vertically, or sloping. Ends of dipoles can be bent if necessary. WITHOUT coupler it covers All the band to me with 40 Meters and practically All the band with 80 Meters. Connected to the same feedpoint is the 20. Order #4825 List Price: $99. thelifeofbrian (50) in ham • 2 years ago. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is:. -L to this pole. Stay away from power lines and have a spotter around if you're on the roof or tower. It's worth experimenting if you've got the time. The total length of the dipole should be just under one-half wavelength for the operating band. The Shorty Forty Antenna can be put up in the space required for a 20 meter dipole. Note that 44 + 25 equals about a quarter wave for 80 meters if used as an inverted L antenna. 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… Video Rating: 4 / 5. If you change to an 80-meter dipole for 80-30 you will have very high SWR on the line on 40 (voltage node feedpoint) and just running ladder line down the tower, then retaining 100 feet of coax, will be bad losses, both in the balun and in the remaining coax. The inverted dipole is a very popular antenna. While an inverted V is mostly omni-directional, this will allow for the lobes of strongest radiation to be east & west. you can operate a loop over most of 80 and all of 40 meters. Oh…you can use the 40-meter dipole on 15-meters without modification. 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. So I don't have alot of time in the hobby. Flags and Pennants-- Receive antennas for limited space with good noise rejection. The 40/80/160 Meter Coil-loaded Inverted V Dipole Antenna Radios Tattoo Sister Radio Band Tattoo Thigh Ham Radio Antenna Dipole Antenna Hams Morse Code Bracelet Templates Free More information. The antenna configuration is shown below. Here's an easily made dipole antenna for 40 and 20 meters that could be used for portable, home, or emergency operations. Antenna was originally a 66 foot (22+44 feet) horizontal with 25 feet of 450 ohm LL vertical. And that’s all there is to it! This is a great first antenna! Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. It was a 40 meter Carolina windom. This is a simple dipole built for two-band operation that I made for portable use with my 20 and 40 meter QRP rigs. 22 Different Wire Antennas. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. The components of my KGD-80 antenna - before and after assembly. Homebrew 40/80 Trap Dipole Design This Antenna design was one that I used about 4 years ago, it worked exceptionally well on 80m and 40m. It utilizes an internal 9:1 UnUn and a BNC female antenna connector. This is a little page with lots of pretty pictures and graphs about my dual inverted V antenna for 40m. inverted-V installation, you may have to 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. That worked fine, and I was able to make another 100 or so contacts before quitting for the night. The Sloper Antenna Explained The classic sloper antenna is a top-fed 1/4 wave vertical antenna sloping down and away from a tower. SAFETY NOTICE: Never install this antenna close to or directly under power lines. I have also used the antenna with an L-network tuner on 75, 40, and 20 meters with delightful results stateside. The maximum radiation for an inverted V-antenna is at its center. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands only available with an antenna.