Ocf Dipole Inverted V

Aug 24, 2018- Explore kevinpinscoe's board "Dipole and Wire Antennas", followed by 288 people on Pinterest. Easy ton install and set up. Hard to beat an inverted V. This 40 and 80 meter inverted V antenna is made with loading coils. A Broadband 80/160 Meter Dipole An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band. It can be installed as an inverted V or as a straight dipole. The FF velocity remains significantly lower than the shear velocity, even at the highest impact velocity tested, about 2. Length approximately 135 feet. Fed at 34% from the end, it uses a single feed wire and can be resonant on more than one band. MFJ-1778 G5RV Multiband Antenna 1 MFJ-1778 G5RV 160 through 10m Antenna Introduction The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. Used mainly 20M and lower. Right now I have a off-center fed dipole at 28ft. But for gen­er­al pur­pose work at longer dis­tances, it is not a good choice. into a small container equipped with a ring). 45MHz) bands at my previous residence in Melbourne, Victoria in 2004 For my first HF antenna I selection a basic 40m band dipole primarily as a simple antenna that provided access to one the most versatile amateur HF bands. They also have an omnidirectional radiation pattern. A dipole can also be installed as an inverted-V. Use as inverted vee or sloper to be more compact. OK, 40 and 15 m from one dipole doing a little better, but not good enough. A Broadband 80/160 Meter Dipole An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band. They're easy to put up, work pretty well, tune easily with an internal tuner (TS-440SAT, FT-991A and IC-7300) and I'm generally happy with their performance. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1 current balun. Background. I plan to take down the DX-LB sometime in 2014 and replace with OCF 80m dipole, or possibly a short vertical. Matching Transformer is 300 Ohm to 50 Ohm (6:1). Just take the antenna out of the box and hang it up and you are ready to go on four Ham bands. OCF Manual ver. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to change the length of wire also. 8% for one side and 62. "Hello Hidehiko JA9MAT. You can build the antenna in inverted V but it will be less efficient and narrow bandwidth on lower bands. com 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. 9 MHz in the SSB portion of the band. The antenna is a BuckMaster OCF-7, inverted V dipole and for 10M I use a Moxon. The NFARL SIG Antenna Discussion on Horizontal Wire Antennas Flat dipole and Doublet 2. moved to VK1HW. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to change the length of wire also. Off Center Fed Inverted V Dipole. For an inverted V with a 900 included angle (legs that slope downward at 45 0), you'll. Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. I too use an OCF dipole with the top 1/2 wave long on 75m. Again, this is based on a feed point height of around 40 feet, inverted V configuration, normal soil conditions and no large nearby structures. This antenna worked remarkably well, was easy to build, and easy to tune to the center of the band. But for gen­er­al pur­pose work at longer dis­tances, it is not a good choice. This was an investigation into whether an inverted V dipole, notionally cut for 20m, could be fed offcenter to work on 20, 17, 15, 12, AND 10. The Frizel OCF Windom with added coil and 30 feet of wire works on 160 centered at 1. Total length is = 33 + 20+20 + 35, then 30 feet down the pole. 8SØC (SMØMPV) Rig TS-590S, PA Expert 1K-FA, Ant KT36XA, OCF Dipole 40 & 80M, Dipole inverted V 160M. MFJ-1778 G5RV Multiband Antenna 1 MFJ-1778 G5RV 160 through 10m Antenna Introduction The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. Parts and Accessories and get Free Standard Shipping on orders over $99 at DX Engineering! Buckmaster OCF Dipole Antennas are made from the best quality materials. Participants: Operators of original QRP rig, commercial or homebrew, including QRP rig exceeding 5w output like IC-703, SG 2020, FT-7, K2 e. The folded dipole needs a 4:1 balun to match coax, but is a good match for 300 ohm twin lead. , the other 55 ft. The next leg goes over the roof ridge and down the other side, (Inverted V) and then horizontally to a pole 30 feet high. "How sharp are the lobes on a dipole? Does it really make a difference which way the antenna is pointing? " I looked to EZNEC for an answer. Input Impedance of off center fed dipoles dipole or as an inverted V. ZS6BKW / G5RV Optimized Multi Band Dipole Antenna Unlike the original G5RV that requires an antenna tuner on all bands, the ZS6BKW / G5RV is capable of operating on 10, 12, 17, 20 & 40m bands generally without a tuner, with SWR readings usually 1. 26 feet from one end. This antenna has resonant points within 160-80-40 meter bands at < 2:1 swr. I decided to hoist an 80 meter inverted vee to the top of my tower, and use it for local ragchewing communication, and, it would also provide a comparison antenna for the vertical array. Based out of Moscow Idaho we proudly serve the local community and regions EMS and Hams. The center connection is an old Carolina Windom 4:1 current balun fed with RG-8X. MFJ-2982 Feather Lite HF Vertical Wire Antennas are 31 ft. moved to VK1HW. The OCF dipole should also give good results if setup properly. How to build a Dipole Antenna by AA5TB. It makes about a 30 degree angle with vertical. Today I built and put up a OCF inverted-v dipole using with a 133 foot total length of #14 insulated THNN with the short leg cut to 44 feet. A wire half-wave dipole trimmed for the frequency of use is very effective and also the most common type of antenna used for NVIS. Tuning the 40/80 Meter Inverted V Dipole Antenna - Duration: 48. Always a fun evening. I use a 40m OCF (Pic on Profile) I call it a 40m OCF because that is what it is closest to. Buckmaster OCF Dipole Installation Diagram (Courtesy Buckmaster) T2FD Terminated Folded Dipole Inverted V TFD. 102 feet long, shorter than 80 Meter dipole. In many practical situations it is possible to operate the dipole satisfactorily without one, but there may be a slight increased risk of interference if one is not used. It is typically used in areas of limited space as it can significantly reduce the ground foot print of the antenna without significantly impacting. Desiring a multiple band wire antenna and not wanting to gather all of the piece parts. into a small container equipped with a ring). Certainly, most North American radio amateurs have not heard about the German version of this antenna. Length approximately 135 feet. I plan to take down the DX-LB sometime in 2014 and replace with OCF 80m dipole, or possibly a short vertical. The antenna is resonate on both bands and does not require an antenna tuner. • Hang as inverted-V – Raises angle of radiation – Fills in nulls off the ends – Efficiency still good • Center is high, that’s where the current is! • As end(s) get closer to the earth (or trees), a shorter wire will resonate – capacitance to earth 50 Ohm Coax or 75 Ohm Coax? • A Dipole in free space is a 72 ohm antenna!. In some embodiments each of Z and Z' are independently selected from dT and dTdT. Working DX is a pleasure as I hear more stations and have 1+ s-unit lower noise when compared to my prior wire antenna. 4 OCF Wide L-Dipole? To answer this question a generalized OCF antenna model was developed where where any length of wire could be bent at any point and each arm could be set at any angle. 2% for the longest side after determining the half wave length at the lowest operating frequency…. Dipole Antenna Length. The RadioWavz VFTD series terminated folded dipole is a broadband antenna designed for fixed station, multi-frequency applications. 7-m in the 1960s. Fed at 34% from the end, it uses a single feed wire and can be resonant on more than one band. It is (roughly) deployed in the opposite direction from the inverted "L". "The fact is an Inverted L with 20 or more radials at least 50 feet and hopefully 100 feet long will absolutely smoke any normal height loop antenna or dipole antenna at nearly any distance on 160 meters. The Dipole - 6 •Inverted-Vee is a "bent" dipole •Radiation pattern adds the effect of ground gain from reflections -Can add as much as 6 dB over free space -Free-space gain best comparative measure •Ground gain varies with height and with ground conductivity 2013. Wind load is not good but I used one for a vertical triband, and the other 3 are supporting inverted V's and a OCF Dipole. Inverted V vs Dipole????? My primary interests are in DX and contesting. Measure 206 11/16 inches from the end of each wire, and cut the wires to this length. The Spencer Multiband OCF Dipole Rancangan yang mendapatkan ulasan khusus dan dipujikan (recommended) oleh Lew Mc Coy W6ICP di buku McCoy on Antennas adalah rancangan yang dikembangkan oleh. 95 from Ham Radio. 11 –Sept 23 2016 2. In the evening when most of us have time to relax and enjoy a little time on the radio, the higher frequency bands are either dead or very crowded. It's different from its antennas. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to change the length of wire also. 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. When I arrived home this afternoon, knowing that I’d have enough daylight left to install the traps in my 80 meter V. , the other 55 ft. Shop with confidence. Halfwave Reflector is: 34. other experienced Amateur's, I added, at my house, a 40m Dipole in inverted V format about 35' off the ground at center and about 9' at ends. About the Buckmaster OCF Dipole. It is similar to a halfwave dipole antenna. I basically lengthened each side of a 40m dipole to the max size for my lot and use a tuner. I have been having problems with a high noise floor for over 10 years, in fact it was why i gave up radio 5 years ago. Matching Transformer is 300 Ohm to 50 Ohm (6:1). The advantage of a 1/2 wave OCF dipole fed 1/3 of the way from one end is that it can be used on the fundamental frequency and its even harmonics. Attach twine to end of wires then use them to also be the guy wires to hold the mast vertical. Z and Z' can independently comprise one or more covalently linked modified or non-modified nucleotides, for example inverted dT or dA; dT, LNA, mirror nucleotide and the like. A travelling wave antenna, used in high-frequency band is an inverted V-antenna. Take a look at the following image. Good idea? Ham Radio Antennas; How to build an Inverted L for the low-bands (40m, 80m and 160m) How to make a quarter-wave vertical mono-bander; How high should my dipole be?. The SWR plot for an 80 meter broadband dipole is shown below. The OCF dipole can be put up in a straight horizontal configuration - some times called flat top, inverted 'V', or inverted 'V' with drooped ends to fit on the smallest of city lots. 8% for one side and 62. The inverted-L In order to make sense of what we say about each type of antenna, we need a point of reference. Simple baluns can be bought from antenna suppliers, or made. The picture above on the left shows the classical Dipole, which is usually fed with 50 Ohm coax, through a 1:1 balun. The ultimate achievement, the status flag, the pinnacle of being a HAM is when you operate from your own tower. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. The most important difference is the high power matching unit. This dipole was built to replace my single-band 40m Linear-Loaded Dipole. The inverted-V just gives a better non-directive radiation pattern than a horiz. Half wave dipole - inverted V configuration (approximately -4. Various installations such as horizontal, vertical, sloper,inverted V etc. This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. Fanned dipoles 4. All of the components (except the UHF connector) are American made. Used mainly 20M and lower. The OCF inverted V has a noise level that is 2 to 3 db higher than the hex beam and produces signal levels that are between equal and 4 db lower. 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. moved to VK1HW. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. In this case the radiation pattern of the dipole is a little bit rounder when compared to a dipole which is mounted horizontally. It’s 12 gauge wire and I’m using 450 Ohm ladder line (the heavy duty stuff). But, as the dipole is brought close to the earth, the radiation pattern changes, and the feed point impedance also changes. Thus, the off-center-fed dipole deserves an update. 2(a): You can. The dipole-doublet(s) 3. Today I built and put up a OCF inverted-v dipole using with a 133 foot total length of #14 insulated THNN with the short leg cut to 44 feet. The picture on the right above shows an OCF Dipole with the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. The maximum radiation for an inverted V-antenna is at its center. The SWR is better than 1:2. Wire Antennas that Work. The primary advantage of an EFHW is that it is naturally resonant on all integer multiples of the fundamental frequency, not just odd multiples like a dipole. About a month ago, I decided to hop up on my roof, and do the ole' switcheroo changing the orientation of my Buckmaster OCF to see if I could possibly make contacts in areas of the world I hadn't yet before. How do you aim a dipole? This is a question that was asked by Larry KC7CKO who has recently upgraded and is going to install a commercial dipole on his property. Variable Folded Terminated Dipole. Ham Radio 40/80 Meter Inverted V Dipole Antenna - Duration: 1 hour, 17 minutes. Enter your search keyword. Building A Homebrewed Off-Center Fed Dipole Scanner Antenna. The larger the wire, the wider the bandwidth. I use an ATU to match. It is a full size antenna on 40 meters and a shortened 80 meter antenna. Resources listed under OCF Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. Mine has a single fire feed like the old fashion Windom worked against some insulated radials, some ground rods, and the cold water pipe. Right now I have a off-center fed dipole at 28ft. "How sharp are the lobes on a dipole? Does it really make a difference which way the antenna is pointing? " I looked to EZNEC for an answer. 8% for one side and 62. It's the optimal solution for who has little space. Please subscribe to my channel to get automatic notification of new videos. (OCF) Dipole •Based on the Windom antenna. No trimming - fully assembled, complete and ready to go with end insulators and crimped center and end connections. Buckmaster 7-band OCF Dipole Antenna, 300 Watts 135 feet long, 80 meters through 6 meters Ships Free quantity Usually works best as an "inverted-V. Participants: Operators of original QRP rig, commercial or homebrew, including QRP rig exceeding 5w output like IC-703, SG 2020, FT-7, K2 e. Variable Folded Terminated Dipole. Shop with confidence. Windom – Similar to the OCFD. I use a 40m OCF (Pic on Profile) I call it a 40m OCF because that is what it is closest to. How well and antenna works is a difficult question to answer. The Moxon is up around 9 meters. Shop by category. So technically the OCF in the drawing (or any other wire antenna I used) would be an inverted V if installed as I've drawn. Dipole Antenna Length. 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. OCF Dipole 7 band 80 -6 Rick on 27th Mar 2018 You are not going to find a better antenna than this one. The picture above on the left shows the classical Dipole, which is usually fed with 50 Ohm coax, through a 1:1 balun. DX-B - 1/4-wave DX sloper-A single wire with high performance on 160, 80, 40 & 30 meters. Azimuth radiation pattern Guanella 4:1 Dual Core Current Balun. OCF 4 BANDS 40-6 HF WINDOM ANTENNA Ni4L Dipole. Full 135 foot antenna. A 40 m center fed dipole will not work 20 m or 10 m. Soapbox from 3830. 5db below the "saggy" dipole above!) Random length wire "Dual Ham-stick" dipole Antenna below 4 feet high. Land is not an issue for wire antennas (almost 2 acres to play with). An inverted vee antenna is a type of antenna similar to a horizontal dipole, but with the two sides bent down towards the ground, typically creating a 120 or 90 degree angle between the dipole legs. The balun transforms the 50 Ohm coax feedline impedance to 200 Ohm at the dipole offset feed point. Use 75 or 50 ohm cable to feed the centre of the dipole. Typically no tuner is required for 40, 20, 17, 12, lower 10, and lower 6 Meter bands. Antenna analysis software by Roy Lewallen. Luckly, we had a break in the cold with a warm day, so I took the dipole out of the attic, grabed my 12' painters pole, 50' of the coax I got with the swr/power meter from Ebay, some old line from my sailboat, and put my dipole up in an inverted-v. Normal DIY shop nylon cord fails in the end, but good for occasional portable use. An 'Inverted-V' antenna for the main HF bands NOTE: I am still working on this page, so sorry about the spelling, english and the science ! Described is a simple inverted-V antenna which, when used with a balanced ATU, can be used on all the main Radio Amateur HF bands (80, 40, 20, 15 and 10m). way to see the things, the gain of this dipole in spiral, with respect to a classic dipole in "inverted V" cut ½ wavelength, must to that the arms of this dipole are longitudinally but short and for this reason but high and are moved away enough of. MY-DP160-10m Single band half wave dipoles with 1:1 BALUN 3kW This is a single band wire dipole with 1:1 Balun /3kW for amateur radio bands 160-10m. A 40 m center fed dipole will work 15 meters with a tuner. 93 one side. However, it does have 4 partial nulls, while the half-wave dipole has only two. 95 from Ham Radio. Covers all bands, 160-10 Meters with antenna tuner. Enter the desired frequency and select the desired calculation from the drop box. Separate the speaker wire into two 18-foot lengths. In this case the radiation pattern of the dipole is a little bit rounder when compared to a dipole which is mounted horizontally. The resource is currently listed in dxzone. The dipole-doublet(s) 3. W1/Chaplin, CT. telescopic fiberglass vertical antennas that set up in minutes, collapse to only 3. The dipole worked pretty well as most resonant antennas do; however, after considering some other alternative wire designs I decided to try a full wave Delta Loop. Resources listed under OCF Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. , where the feedpoint is higher than the ends. Windom, W8GZ who described it in September 1929 QST. Right now I have a off-center fed dipole at 28ft. This antenna has resonant points within 160-80-40 meter bands at < 2:1 swr. Use on 160 Meters as Marconi with tuner and ground. I use an ATU to match. The 4-band Fritzel model FD4 is a special version of a Windom antenna. Typically no tuner is required for 40, 20, lower 10, bands. Used mainly 20M and lower. Similar overall length. Tuning the 40/80 Meter Inverted V Dipole Antenna - Duration: 48. For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! 12 meters may also work on the 4-Band 300 watt model. One leg is 67 ft. Not enough room fo 80 meters. Hard to beat an inverted V. OCF Dipole 7 band 80 -6 Rick on 27th Mar 2018 You are not going to find a better antenna than this one. Furthermore, the "inverted V" dipole does not require a rotor since it's an omnidirectional system. Above right: The red trace is a G5RV inverted V with the apex at 12m and the ends at three metres. The Inverted "L" is a 1/4-wave Marconi, OCF Dipole 7 band 80-6 meters Poly-Stealth Antenna Inverted L 80/6 meter band HF Antenna SWL Dipole Marconi. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to change the length of wire also. "The fact is an Inverted L with 20 or more radials at least 50 feet and hopefully 100 feet long will absolutely smoke any normal height loop antenna or dipole antenna at nearly any distance on 160 meters. SWR is less than 1. Working 160M From a Small Lot (and Larger Ones Too) -Half-wave dipole is 260 Ft, inverted L only about 35 ft tall. The idea was to test each antenna in as equivalent band conditions as possible. 102 feet long, shorter than 80 Meter dipole. The dipole will have more ground loss than the loop. rivals, and it works. fullwave dipole when driven at the center will display a typical ½ wave dipole pattern being directional broadside with null off the ends. NOTE: Do NOT try to add 6 meters to the multiband HF dipole. 05 $ Over 2000 sold with perfect success ujm-150 end fed antenna matcher made by a ham for hams bnc version tiny and light weight but ready and capable to put in work! this unit is encased in a 1"x 2"x 3" abs box! and comes with a bnc. Length approximately 135 feet. The OCF dipole can be put up in a straight horizontal configuration - some times called flat top, inverted 'V', or inverted 'V' with drooped ends to fit on the smallest of city lots. Working DX is a pleasure as I hear more stations and have 1+ s-unit lower noise when compared to my prior wire antenna. Last year on Field Day I was able to use an OCF dipole for the first time, and I enjoyed the quick bandswitching it allowed, so I thought I'd try and find a good OCF dipole for use while in the field. I like to do business with people like you and I will be sure to tell all my friends. 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. This is a popular antenna system; many have been built using DX Engineering baluns. 1109/ACCESS. DIPOLE, INVERTED V, LONGWIRE. The MMANA-GAL model of the K1POO antenna at 8m height shows that the antenna has a more complex lobe structure as the frequency increases. I plan to take down the DX-LB sometime in 2014 and replace with OCF 80m dipole, or possibly a short vertical. Add coax feedline -- get on the air! The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. It needs no tuner on 40m, 20m and 10m. G'day, Another antenna experiment I bought a 4:1 Balun and built an OCF dipole. 62 m) of Dacron rope. Being in an inverted V position, this was fairly simple, so I disconnected the balun and swapped positions of the legs. Online and downloadable Dipole, Inverted V and Ground Plane Calculators. I tried using it in a configuration where the apex was about 16 feet off the ground (which flies in the face of Buckmaster's recommendation of 32 feet minimum) and the long element ran out for about 45 feet and then bent at a right angle. Overall length is 40 ft. 5 across both bands. Kit includes 1:1 Balun, 4 End Insulators, 375' 14Awg Wire, 8 Spreaders, and 100' 1/8" Nylon Rope. The Frizel OCF Windom with added coil and 30 feet of wire works on 160 centered at 1. = total 108 feet. This is a little page with lots of pretty pictures and graphs about my dual inverted V antenna for 40m. So far no one has rated yet. If you have less space, consider placing the mask in a corner and making the antenna at right angles. Stealth antennas for the loft Fig 4. DX-B - 1/4-wave DX sloper-A single wire with high performance on 160, 80, 40 & 30 meters. This antenna worked remarkably well, was easy to build, and easy to tune to the center of the band. Typically no tuner is required for 40, 20, 17, 12, lower 10, and lower 6 Meter bands. SOAPBOX: Put a 1/2wave 80m inverted L up to improve on my score. Efficiency is less than a horizontal dipole of similar height, but the radiation pattern is more omni-directional which may be considered to be an advantage. I have the radio, power supply, and antenna tuner (if required) mostly narrowed down but am uncertain about antennas. A feed line is attached to an optimum point along the dipole by a BALUN. Above: Screen shots from several EZNEC v. One separate dipole for each band. The second antenna is an absolutely deadly sloper that is a mere 34' in length and requires just 25 to 30 feet of support height. 05 $ Over 2000 sold with perfect success ujm-150 end fed antenna matcher made by a ham for hams bnc version tiny and light weight but ready and capable to put in work! this unit is encased in a 1"x 2"x 3" abs box! and comes with a bnc. 19 may 2011. 5db below the "saggy" dipole above!) Random length wire "Dual Ham-stick" dipole Antenna below 4 feet high. This is essentially a longer off-center fed (OCF) dipole antenna. HF Base Antennas Beams Verticals Di Poles Inverted V's Call LAMCO on 01226 361700 My favoutite HAM store. Enter the desired frequency and select the desired calculation from the drop box. 4 OCF Wide L-Dipole? To answer this question a generalized OCF antenna model was developed where where any length of wire could be bent at any point and each arm could be set at any angle. Just a Dipole Gary Wescom N0GW July 16, 2007 Often we will hear people describing their antennas as ‘just a dipole’. But I can't find anything on dipoles and such in which the ends are not in the same vertical plane as the center. My property in the back is surrounded by pine trees 40-50ft tall. 7 to 1 across the entire 80 meter band. Steel whip on car 96 " or just a 40m ham stick. Thanks to ladder line, the vast majority of my output power is now radiated at the antenna-- not lost in the feed line. Similar overall length. Excel Worksheet for Building Any 1/2 Wave Dipole (Center-Fed, OCF, Windom, New Carolina Windom) Here is a spreadsheet I designed in Microsoft Excel for calculating the first cut and the final cut (after testing) of a 1/2 wave dipole, whether center-fed, classic off-center-fed, Windom, or New Carolina Windom. " Erecting. This is a simple Two Wire OCF Dipole Antenna using a 6:1 Matching Transformer with a Coax Cable feed-in-line. 2% for the longest side after determining the half wave length at the lowest operating frequency…. IMHO if I was limited in antennas I would put up an 80 meter inverted V (1:1 balun) and use a OCF cut for 40 meters on the same mast (4:1 balun) in a inverted V configuration. Ted's Quad Band Dipole. A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. The picture on the right above shows an OCF Dipolewith the feedpoint positioned at the same feedpint of the classical WINDOM antenna, fed with 50 Ohm coax through a 4:1 or 6:1 balun at a point 1/3 of the distance from one end. Also, designs that did better on 80 m, lack 15 m. Coax fed OCF 'Windom' antenna. Certainly, most North American radio amateurs have not heard about the German version of this antenna. 8% for one side and 62. Overview - This is the 6-40 meter Alpha OCF Dipole Antenna. Horizontal is 90°. Half wave dipole - inverted V configuration (approximately -4. Each is constructed from High quality 300 ohm transmit ladder line NOT the flimsy TV wire that has been commonly used by others in the past. The feeding point of this antenna is located 13. The next figure shows a variation on the original W3EDP, by adding a variable series-capacitor to the transmitter side of the transformer:. 2 MHz, here’s how to make it. 72/73, Walt W5ACM The ATS-3a was doing reasonably well this month. The DOUBLE BAZOOKA antenna design was first conceived as a radar antenna in the early 1940's for use by the U. May 2012 - May 24th 2014. I will be mounting it as a inverted V with the ends at about 10 ft off the ground. Ted's Quad Band Dipole. I think the main plus would be. • Hang as inverted-V – Raises angle of radiation – Fills in nulls off the ends – Efficiency still good • Center is high, that’s where the current is! • As end(s) get closer to the earth (or trees), a shorter wire will resonate – capacitance to earth 50 Ohm Coax or 75 Ohm Coax? • A Dipole in free space is a 72 ohm antenna!. Half wave dipole - inverted V configuration (approximately -4. The same is true of 10 meters; as frequency goes up, multibanding gets more quirky, and SWR curves and efficiency suffer. 05 one side. The OCF-2K75S is only 79 feet long rather than 133 feet on the OCF-3K80. Tuning the 40/80 Meter Inverted V Dipole Antenna - Duration: 48. 45MHz) bands at my previous residence in Melbourne, Victoria in 2004 For my first HF antenna I selection a basic 40m band dipole primarily as a simple antenna that provided access to one the most versatile amateur HF bands. Even zip cord such as what is used for lamp cords will perform quite well. When I arrived home this afternoon, knowing that I’d have enough daylight left to install the traps in my 80 meter V. Covers all bands, 160-10 Meters with antenna tuner. 0 on all these bands. The feeding point of this antenna is located 13. Dipole Cousins Inverted V – Only needs one support. Designed for limited space. Online and downloadable Dipole, Inverted V and Ground Plane Calculators. IMHO if I was limited in antennas I would put up an 80 meter inverted V (1:1 balun) and use a OCF cut for 40 meters on the same mast (4:1 balun) in a inverted V configuration. Carolina Windom 80m long. The maximum radiation for an inverted V-antenna is at its center. Typically no tuner is required for 40, 20, 17, 12, lower 10, and lower 6 Meter bands. A 10/17 Meter Hanging Loop Antenna Loops work! Build a hanging loop for 10 and 17 meters that will give almost 3 dBd of gain. The OCF dipole should also give good results if setup properly. You can build the antenna in inverted V but it will be less efficient and narrow bandwidth on lower bands. Alpha Delta Model DX-OCF Off-Center-Fed (OCF) Dipole 300 Watt antenna (3000 watt Model DX-OCF-HP may vary slightly) Center height 32 feet, end height 8 feet Erected as an inverted "V".