Ocf vertical dipole antenna. 80-10 meter OCF antenna layout.
2 to have stable directional properties far from the antenna (the antenna far field), and different directional properties closer than ~/2λπ (the antenna near field). Comparing Greyline Performance HF vertical antenna & HOA Flagpole Antenna to the famed 43-foot vertical I hope someone may find my experience between the two antenna types, or the two antenna companies, helpful. I ordered the OCF-3K80 Multi-Band Dipole based on recommendations from other HF stations and observing their The “Micro Series” Off Center Fed antenna is made using #18 stranded insulated wire and a BNC for connection your coaxial cable. No other antenna (Vertical Dipol, etc) can reach this results!!! Also not my R9 vertical! And the OCF is 10m (30 ft) only mounted over ground between two House. OCF Vertical Dipole Antennas mean No Radials, Stealthy Elegant Design. Includes bonus NVIS pattern useful for disaster prep & emcomm operations. 99; Description: The multiband vertical dipoles come in 24 ,28 and 33 foot long models. They are omnidirectional, meaning they transmit and receive Folded dipole antenna basics. RESULTS Nov 1, 2013 · Vertical HF antennas still remain useful. No Radials, OCF design for lower angle, low loss, low noise, high performance for Real DX plus the important NVIS pattern for disaster prep & emcomm. We also used the simple wavelength formula: Wavelength = c / f. In most cases, no antenna tuner is needed and switching bands is as easy as changing the band on the radio. wish i build it alot earlier. All-Band OCFD. Need a NVIS solution How about taking a DX80 OCF and putting it up on an inverted V only about 20'. In the 1990s, the trend migrated to 4:1 Guanella (current) baluns. May 5, 2023 · The half-wave dipole is primarily a monoband antenna, since it is one-half wavelength long at only one frequency. Double Doublet. They are designed to give you years of trouble-free service! Buckmaster antennas are shipped fully assembled, ready to deploy with no tuning or trimming I hope someone may find my experience between the two antenna types, or the two antenna companies, helpful. If you must hang the antenna from a tower, use a non-conductive 5 foot or longer horizontal standoff to keep the antenna away from the tower. Greyline 24-foot DX Flagpole Antenna, a real Flagpole approved for ham radio in HOA, smart design for Stealth, No Radials, OCF vertical antenna, a vertical dipole, for multiband HF operation, 160-6M. A windom antenna is a single-wire-fed antenna which is worked against ground. This offset gives the antenna the multi band capability. Antenna Projects for the 10 MHz - 30 meter Band category is a curation of 23 web resources on , Portable Magnetic Loop Antenna Version 2, Bobtail Curtain for 30 meters, The flower pot antenna. MATERIALS The antenna behaves more like a horizontal dipole where the strongest signal is to the sides. NVIS dipole. It's the best antenna for the money and easy to build. 10 placed somewhere between 40 and 20 percent from one end of a an antenna, instead of in the center. Gain: better than a 1/4 wave vertical. Antenna Static Bleeders; Broad Band Terminated Dipoles (BBTD, T2FD) Bullet Antenna Products; Coax Feed Line Common Mode Chokes (1:1) Dipole Antennas; End Fed Half Wave Antennas; End Fed Long Wire Antennas; End Fed OCF Antennas; G5RV/ZS6BKW Antennas; Loop Antennas; Off Center Fed (OCF) Antennas; Vertical Antennas; Kurt Sterba The RadioWavz DX80 Off Center Fed Windom Dipole Antenna is a high-performance antenna designed to provide excellent reception and transmission capabilities for amateur radio enthusiasts. com www. This antenna is great. See Figure 2. For this study the long arm is fixed vertically and the angle of the shorter side arm is adjusted upwards in 15 increments starting from a vertical OCF dipole. The disadvantages of feeding off-center are thought to be well known but in fact I have not seen much real life test data on real antennas. 5 The author also found that a 1:1 balun / choke following the 4:1 balun was needed to get the expected 40-meter resonance. The Sloper. net Mar 8, 2024 · this 7-Band OCF Off Center Fed HF Dipole Antenna 1 KW PEP wire WORKS GREAT on the 7 bands advertised. Can be use for field operation or where a no radial vertical is required The OCF dipole is a compromise design HF antenna which allows operation on several bands without using an antenna matching unit (ATU). No Radials for Higher Performance, Lower Angles, Lower Noise and Lower Loss, for DX 80-6M. In its basic form the folded dipole antenna consists of a basic dipole with an added conductor connecting the two ends together to make a complete loop of wire or other conductor. Antenna Systems. Uses hybrid balun containing wide band 4:1 transformer + 1:1 common mode feed line choke to keep This Digital HF Military Vertical Dipole Antenna provides 0-2500km of Digital mode coverage from 7MHz to 30MHz, which is 36 inches x 4 inches x 1. Mar 24, 2021 · However, any OCF dipole easily outperforms aforementioned obtrusive antenna arrangements. Switched over to another DX80 OCF up at about 80' flat. This placement is believed to hit the 100-ohm point on the antenna wire, where a 2:1 balun will reduce the impedance to 50 ohms for coaxial feed on the fundamental and even harmonics. 5 inches in size and weighs 22 ounces. Performance was better that I expected!!! Even worked on 80m and 160m at reduced power. COVERAGE: 80/40/30/20/15/12/10m This antenna was built just in time for CQWW CW in 2011. This off-center fed dipole antenna is ruggedly built with 14 awg stranded copper wire,and is weather-resistant for outdoor use in permanent installations--- external hardware is stainless steel. The Greyline HOA DX Flagpole Antenna is an electrical-half-wavelength vertical dipole Most verticals work against ground radials and are fed unbalanced at the base. Nov 15, 2018 · Okay, so I modeled this antenna and found it to be a regular end fed half wave vertical with the bottom acting as a short counterpoise of sorts. Apr 21, 2021 · Like most HF antennas, the OCF is based on the dipole. 66 feett (20 m) long. Dipole Antenna, Off Center Fed, 160, 80, 40, 20, 17, 12, 10, 6 meters, 300 Watt, 270 ft. 20' HF Vertical Antenna, No Radials, OCF vertical dipole for 160-6M. OCF (Off Center Fed) Dipole antennas are two calculated element lengths that are balanced with a BALUN. Secondly, the bottom of a half-wavelength dipole must be insulated from ground. 1. (OCF) Antennas; Vertical Antennas; Kurt Sterba’s Korner Nov 1, 2019 · An OCF Dipole with Homebrew 4:1 Balun; Have used an OCF dipole for about 10 years, SWR between is 1. We want to work 160-6M, right? This is assisted by an elevated feed point, a different style of antenna that does not require radials, traps or stubs to match the antenna to a Dec 12, 2017 · Review Summary For : Buckmaster 7 Band, 3KW, OCF Dipole Antenna; Reviews: 92 MSRP: 324. From antenna basics, we know that a standard dipole has an impedance of about 70 Ohms when it is about a half wavelength above normal ground. My 20 ft Greyline flagpole ocf dipole is excellent! It was easy to install, surviving Michigan winters and really works! The installation here in the HOA looks great too! I operated in the CQWW CW event casually and only did S&P. Antenna Static Bleeders; Broad Band Terminated Dipoles (BBTD, T2FD) Bullet Antenna Products; Coax Feed Line Common Mode Chokes (1:1) Dipole Antennas; End Fed Half Wave Antennas; End Fed Long Wire Antennas; End Fed OCF Antennas; G5RV/ZS6BKW Antennas; Loop Antennas; Off Center Fed (OCF) Antennas; Vertical Antennas; Kurt Sterba Using the basic expressions for radiation derived in Section 10. FT8 & QRP ops enjoy more dBs. Ham Radio is fun again. 1 to 1. 44 SWR in free space) Greyline 16-foot DX Flagpole Antenna, a real Flagpole approved for ham radio in HOA, smart design for Stealth, No Radials, OCF vertical antenna, a vertical dipole, for 160-6M. This type of antenna is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. No Radials. I made one for 10 meters, even though the Review Summary For : ZEROFIVE-ANTENNAS MULTIBAND VERTICAL DIPOLES; Reviews: 9 MSRP: 285. The OCF dipole does require a balun. To buy a vertical antenna equal to this would cost several hundred. For the OCF, the goal is to determine a point where the impedance is low enough to be useable on multiple bands. (my opinion) Have build them from scratch using junk parts and small gauge wire for temporary use, always worked well. 5 across 4 bands . The antenna I ordered Greyline’ 28’ OCF Vertical Dipole October 25,2018 (Order #FP-55221014) I erected antenna in Happy Valley, Oregon (there is pix on their website). It’s higher, though not necessarily exactly in the middle. Jul 30, 2024 · The antenna length formulas used in our dipole length calculator are as follows: L = 468 / f. The OCF Antenna Wire kits are for 80 meters (95 feet + 40 feet) that covers 80-40-20-17-15-12-10-6 meters or 40 meters (12 feet and 53 feet) that Greyline 12-foot DX Vertical Antenna, an OCF vertical dipole for all band HF radio operation. Use on WARC bands or 15m can I will not quote the whole section covering this antenna but I will pick a simple tuned dipole over an EFHW every single day. Dec 17, 2018 · Okay, consider elevating 4-16 radials a 3 to 6-inches above the ground. A Smarter, Stronger, and more Elegant all-band ham radio antenna option. 00; Description: A well-constructed 7 band off-center fed dipole, designed for 75/80, 40, 20, 17, 12, 10 and 6 meters. l = L / 2. At the lower end of the HF spectrum, the λ/2 height requirement for horizontal antennas can become cumbersome (even though a horizontal phased array may weaken this requirement by allowing somewhat lower heights). secure the ends, the 4-Band antennas need at least 60 feet of ground space from end-to-end. This approach to multiband matching provides a dipole that is easier to deploy for more than one band of coverage. 39 (versus 1. Base HF antenna for 10-80 meters that is an off-center fed dipole type vertical and is pre-tuned for 9 bands that deploys in minutes. Order or Call 435-200-4902 Dec 17, 2010 · The OCF-3K80 is an off-center fed multi-band dipole. For this pole, it’s roughly 20% from the bottom. 2 END-FED HALF-WAVE. Building the Vertical Dipole Antenna The center vertical sections and main horizontal support arms are made of one-inch square aluminum tubing from a local hardware store. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Yes, the length matters. HF Mobile Antennas AK4XO Screwdriver •These antennas are shortened versions of vertical antennas •Use loading coils and capacity hats to match and increase efficiency •Screwdriver antennas use a motor to adjust the tap on the coil •Hamsticks are helically wound, single-band antennas Ham Radio's Premium HOA Flagpole Antenna is a multiband stealth HF vertical dipole antenna. It's a dipole fed off center with a 4:1 current balun at the offset feedpoint. 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. 64 (or G=2. Design and Structure: Apart from Alpha’s OCF type vertical dipoles antennas or non-resonant verticals fed at the base with a BALUN or UNUN, HF vertical antennas are typically quarter-wave antennas with a vertical element and a ground plane consisting of radials. The best antenna I have built was a 40m elevated ground plane. That's Smart, Strong, & Elegant. Traditionally, most people used a 4:1 Ruthroff (voltage) balun in their OCFD antennas. " Comparing Greyline HF Vertical Antenna to well-known antennas such as the Hy-gain AV-680 and Cushcraft R9: *The Red inner rings are 80M, blue 40M, green 20M, and orange 10M. The basic format for the folded dipole aerial is shown below. 95; Description: No tuner, multi-band, off-center fed(OCF), 135 ft. Patterns of vertical (red), dipole broadside (blue) and dipole endwise (green) Some of the simplest antennas, like the half wave dipole or inverted vee, and full wavelength loops (either horizontal, or fed for horizontal polarization) work very well for this purpose when they aren’t too high above ground. Building an off-center fed (OCF) Dipole – Loudoun Amateur Radio Group. Since the assembly is done in 6 simple and fast steps, the 27OCFDV dipole is well suited for both base and portable use. vertical. Long-wire Feed using a 4:1 Balun. HF Vertical. 1 CMC affects the shape of the SWR curve, the relative SWR level itself, the “apparent point of resonance” (point of minimum SWR Antenna Systems. This article as well as this one best explain how and why this type of antenna works on multiple bands. A Simple 7-Band Wire Antenna. Call 435-200-4902 The PAL-OCF4010 covers 40-30-20-17-15-12-10 and 6 meters in a length of 66 feet. In every test I have done, the Buckmaster OCF dipole equals the performance of the vertical antennas, and almost always exceeds the performance of these verticals. Routing the feed internally minimizes coupling of the feedline with the antenna. As the ends appear to be folded back, the antenna is called a folded dipole. 95. OCF DIPOLE ANTENNA BALUN. Super convenient and quick – great for contest operation! Buckmaster OCF Dipole Antennas. This version of the OCF assumes that there is RF on the outside of the coax forming a supplemental vertical radiator of about 10' length on the 40-meter model. " THIS IS WRONG! THIS ANTENNA CAN WORK ON 15m! Oct 15, 2014 · RadioWavz DX Off Center Fed Windom dipole antenna - DX40 40 meter DX (OCFD) Windom The Radiowavz DX (OCF) Windom is a off center fed dipole antenna that exhibits outstanding performance on multiple bands typically without a tuner. PVC coated wire, with EVERY copper strand tinned to prevent corrosion. As it is a dipole, no ground radials are needed. But before we bend it, let us first take a look at the OCF vertical dipole in Figure 2. This article discusses suitable first HF antenna options for amateur radio operators with limited space. The center lead of the coax forms one half of the dipole and the braid forms the other. For a conventional antenna I would normally split this wire in half and place a feed point in the center. Antenna e-Books. Jul 7, 2020 · The OCF or Off Center Fed Dipole antenna is much like a conventional dipole antenna in that the formula you use to calculate the length of it is the same. The OCF dipole antennas from Alpha use a modified UnUn to match impedance. 8 The Double Bazooka antenna’s 2:1 bandwidth is only 14% greater than that of a simple dipole, according to the Antenna Book, which calls the antenna “controversial,”9 probably because it has been questioned whether the antenna’s bandwidth comes at the expense of low efficiency. The OCF dipole is constructed using top quality, Poly-STEALTH 13 Breaking strength 370 lbs. The OCF dipole presents a reasonably good match to the transmitter across multiple bands which are EVEN harmonics of the fundamental frequency, including 80, 40, 20, 10 and 6 m bands. In fact the only difficult part of an OCF dipole is the balun and I will be explaining how the balun works and also how you can make your own. It’s a dipole fed off center with a 4:1 balun at the offset feed point. Order 7-Band 100 Watt QRP (low power) OCF Dipole Antenna: $256 Order 7-Band 300 Watt OCF Dipole Antenna: $307 Order 7-Band 3,000 Watt OCF Dipole Antenna: $398 Order 7-Band 3,000 Watt STEALTH (balun enclosure painted olive green Making this antenna especially useful if you have a disability such as being mobility or sight impaired. No Radials for Higher Performance, Lower Angles, Lower Noise and Lower Loss, for DX 160-6M. The BULLET-4006 uses the same dimensions but the wire section is 55 feet as in the OCF and the coax outer braid is used for the “other” part of the OCF dipole. Since 10 meters and cb (sometimes refered as 11meter) are so close in bandwidth often a cb antenna can be tuned for 10 meter. SPECIFICATIONS Deployable with digital quantum and/or spread-spectrum equipment. The GU4-HF-250-M balun, used on this antenna, uses the same cores that are used in the standard QRP OCF baluns. Product is in production Jun 23, 2014 · 8 Band 160-6 270 feet 180/90 each side. Over the last four years of using these antennas and over 10K QSO's what else is there to say. This model should NOT be used for a traditional Windom dipole that has a vertical coaxial radiator. You really do need 100+ to make a real difference. The off-center fed dipole works well with most HF Vertical Antenna, stealth and elegant, 160-6M, No Radials, No Guy ropes. Using EZNEC, the design of an OCF dipole allows many variations in overall antenna length, height and feed point to achieve the desired result. The big advantage of this design is that you can make an antenna that does not require an antenna tuner by utilizing the constant impedance of the happy convergence that happens at 120 degrees. Super convenient and quick – great for contest operation! Choose 500, 1500 or 5000 watts PEP power levels. So, power rating can be also remarkable. Homemade Ant . Like any other antenna system that involves high SWR, use the shortest length and best quality coaxial cable possible. There are even variations of the dipole that can cover multiple bands, like trap dipoles , parallel dipoles and off-center-fed (OCF) dipoles. The reasons for this selection as the first antenna to be installed are that. What antennas are available? There are Once this tough and ultra-lite vertical antenna is deployed, a horizontally sloping active wire element is attached at the base of the vertical antenna. Buckmaster OCF Dipole Antennas. I have also installed a Butternut 80/75 - 40 meter vertical and a Gap mono band 20 meter vertical. For the PAL8010OCF, the impedance is very well behaved in a limited, easy to match range throughout the 1-54 MHz range and, in fact, that antenna also works very well on 6 meters with very good gain. Compared to a single-band resonant dipole with equal length legs, the OCF Dipole offers the advantage of HF Multi-Band operation at the "cost" of slightly to somewhat elevated SWR. Antenna Calculator. They are typically half-wave antennas and are the simplest and most widely used type of antenna. 73 KI6GEA. 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. The Classic Dipole. Small Mag Bullet Hybrid (4:1) HF Balun + 1:1 Choke, 1. On 17 meters to 40 meters at 40 watts I have QSO with Japan, Spain, Ukraine, Portugal, Brazil, Canary Islands. Made with Stranded 14 awg UV insulated wire. The Palomar Engineers 4010 OCF is a very popular antenna and consists of an off center fed dipole with sides of 55 feet and 11 feet and it will work all bands from 40-6 meters. Vertical HF antennas do have their merit though. 5 %µµµµ 1 0 obj >>> endobj 2 0 obj > endobj 3 0 obj >/XObject >/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group 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 antenna can be mounted as a dipole or inverted vee. 80-10 meter OCF antenna layout. The OCF-3K80 is complete with a 4 to 1 Balun. If you don’t have enough for a λ/4 vertical. High Strength Aerial Wires are manufactured with high strength, high conductivity Bare Copper-Clad Steel (BCCS) and insulated with a high quality UV Resistant Polyethylene to provide you with one of the strongest and longest lasting antenna wires on the market Most of all the antenna for HF that I use are fed with ladder line 450 ohm. The antenna ground side should be attached to a radial system as with a vertical antenna. The RFI (Radio Frequency Interference) problem can often be traced back to particular antennas. Write or call 435-200-4902 The antenna that I put up first was a vertical dipole for 10, 15, 20 and 40 meters. In field tests run by the author in 2013 comparing the effects of CMC on a 40m dipole to the effects on a 40m OCFD showed huge differences in the way the antennas behave in the presence of high amounts of CMC. Wire Antennas. Space Saving Ant. It is omni directional (in azimuth) and, if it is a half-wavelength long, has a gain of 1. 1,2 Here is why: Placing the feed point away from the center, increases the resistive part of the feed impedance and source load more than the reactive (imaginary) part of the resonant antenna, which is nearly resonant. Carolina Windom. 5 -j1. Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. Greyline 12-foot DX Vertical Antenna, an OCF vertical dipole for all band HF radio operation. Its unique design allows it to work efficiently across multiple frequency bands, making it an ideal choice for those looking for a versatile and reliable for a λ/4 vertical. Feeding the OCF dipole at a point that is one-third of its Apr 30, 2023 · In almost all cases it starts with the antenna and feed line. The bottom of a λ/4 vertical is usually grounded. Skip to content. "By design it has a good SWR only on 40/20/10m. They will tune 6 to 40 meters and handle full legal limit plus. 16' DX Flagpole Antenna, Stealth HOA HF Vertical Short overview of antenna feed points Dipole, OCF, Zepp, Loop overview Popular End Fed Antenna s How to choose an End Fed Antenna that fits your needs Secrets of Non-Resonant End Fed Antennas Typical Configurations that work all the time Feed Line Chokes, Counterpoises and Coax Noise Filters Solving End Fed Antenna RFI Problems Premium HF Vertical Dipole Antenna for 160-6M multiband radio operation. 1x OCF-4010 & 8010 for tuning. HOA HF Vertical. Selecting. The antenna is ideal for local communications within 1000-2000 km of your location or for DX depending on how high the antenna is mounted and in what configuration. com "A dipole antenna in free space exhibits a feed impedance of 72 Ohms, and has a doughnutshaped radiation pattern. Resources listed under 30 Meter Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. We did this and worked over 600 40m contacts all over the US and DX just on that one antenna. %PDF-1. Jan 6, 2018 · DJ0IP 2018-01-03; OCF Dipoles Fed with Ladder-Line; The advantages of feeding the dipole in the center are well known. An NVIS pattern for regional disaster prep & emcomm services. The change in antenna characteristics are very interesting in the Tall L-dipole form. The feed line routes into the lower half of the dipole up to the feed point. By measuring impedance between the center and the ends of the dipole, you may find impedances between 73 and 3,000 ohms. As we lower it, the impedance drops. Nov 8, 2018 · Like a common wire dipole (like a wire dipole in the tree) the flagpole antenna is a balanced antenna. Directionality is significant. OCF-5K80 Multi-Band 5KW Dipole Antennas $ 169. 160M End-Fed. But because it is such a simple and effective antenna for many HF applications, several different methods have been developed to use a single dipole antenna on 2 or more bands. Enjoy secure comms, lower angle, low noise for new license beginners to pros. "If I can hear it, I can work it and this antenna hears well. 34 + 4. On the other hand, an OCF dipole is an ungrounded dipole antenna fed with twin-conductor line, either coaxial or open wire parallel conductors. HOA & XYLs Approve. Length Total, Each See More Specifications The Palomar Engineers 4010 OCF is a very popular antenna and consists of an off center fed dipole with sides of 55 feet and 11 feet and it will work all bands from 40-6 meters. That is: 468 / Frequency Mhz will give you the overall length of the antenna. Sep 5, 2015 · An OCF antenna is similar to a dipole, except that it is not fed at the center but at a point offset from the center. 1. Below, we'd like to show you why the HOA Flagpole Antenna is called a high-performance antenna system. 160M Windom. Choose from OCF, Vertical, Loops, Zepps, end feds using Palomar Engineers Over-Engineered to Outperform(TM) impedance transformers and feed line chokes for outstanding antenna performance! Palomar Engineers Antenna Info Sheet The Greyline vertical antennas are modeled to perform well across all bands rather than maximizing performance for one specific frequency band. It competes in popularity with the "Half Size G5RV" from England. Background. 8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas. Jun 23, 2014 · Antenna is in inverted V with balun at 30 feet and ends at 20 feet. This freestanding OCF vertical dipole antenna is designed to provide 160-6M operation and is perfect for limited space applications. Let’s assume you want to focus on 80m and 40m CW. The elevation angle is 16 degrees, making it a decent DX antenna. i used to have a full wave 80 meter vertical diamond shaped wire fed at 100ft that didnt work as well. I ordered Greyline’ 28’ OCF Vertical Dipole October 25,2018 (Order #FP-55221014) I erected antenna in Happy Valley, Oregon (there is pix on their website). The antenna is a half-wavelength dipole fed at one end. Having the Buckmaster OCF close to a metal mast or tower often results in poor SWR on 80 Meters or other bands. The EFHW (End-Fed Half-Wave) antenna has become popular with portable operators because of its mechanical simplicity. Alpha Antenna - portable ocf dipole vertical antenna. Ham-made in USA from quality materials. A feed line is attached to an optimum point along the dipole by a BALUN. For ham radio, NVIS, disaster prep & emergency communications. 54 dBi. The configuration of your Antenna system (graphic) Sep 24, 2020 · You can erect dipole antennas in a variety of configurations to meet your needs: flat-top, inverted-V, sloping dipole, or folded dipole. It will work well on the 80, 40, 20, 17, 12, and 10-meter ham bands with no need for tuning. From the Horizontal and Vertical L-dipole studies it is known that the far field radiation pattern around an L-antenna is not round. 68 ohms in free space) SWR 50: 1. The Off Center Fed dipole (OCF) is made up of two different lengths of antenna wire (dipole legs) for operation on multiple bands. The vertical antenna has many devoted supporters in the ham community who claim to get fantastic results, 2. 9 OCF ½ WL Commercial Trickery Crafty antenna designers came up with the vertical configuration of a ½ wl Off Center Fed (OCF) dipole making the short end of the dipole being an array of multiple, horizontal, 4 foot long metal rods – [Google-- Cushcraft R7 or R-8000 and Hy-Gain AV-640 or 680]. No Radials are needed for high-performance, 160-6M. Here the flagpole vertical dipole clearly stands out compared to my EFHW wire. Order today. Each one is freestanding and is fed with ladder line to your balanced tuner. 00 Sale. Taking one vertical angle and frequency with another, the RadioWavz DX (OCF) Windom is Omni directional. In its simplest form, a dipole is an antenna made of wire and fed at its center as shown in Fig 1. and it works great, i used a 4:1 balun and feed it at the 66 ft level. The wire is 65 strand, 12 Ga. Smart, Strong, Elegant. It recommends an Off-Center Fed (OCF) Dipole and a Vertical Dipole, detailing the installation processes, considerations for stealth and ease of setup, and the characteristics that make them ideal for newcomers. But my old CB base antenna I had is long gone and I had always wanted to see how a vertical dipole antenna would work. I Use an OCF dipole with a 4:1 balun and find it works The Off-Center-Fed Dipole is a Dipole whose feedpoint is at a point removed from the center of the antenna. 10M Antenna. 2 = 8. OCF dipoles use a 4:1 Balun to achieve a lower SWR on bands with similar harmonics. I have 3 OCF antennas (MyAntennas) 1x OCF-8010-3K at home. Update, I have been using this antenna with FT8 software. Design Software. DX Engineering Multi-Band Off Center Fed Dipole Antenna Kits (OCF) take advantage of the practice of feeding two different length wire dipole legs with a 4:1 Balun. May 1, 2021 · Interestingly, there is an online article about a 40-meter OCF antenna by W3AZ (formerly K1POO) with nearly identical dimensions but without the load capacitor. 19. Greyline 28-foot DX Flagpole Antenna, a real Flagpole approved for ham radio in HOA, smart design for Stealth, Free Standing, No Radials, OCF vertical antenna, a vertical dipole for 160-6M. Free Shipping. meters is only 287 kHz, according to the Antenna Book. where: Nov 28, 2023 · Figure 5. This antenna is ideal for those who do not use a tower and beam. Review Summary For : Buckmaster 7 Band, 3KW, OCF Dipole Antenna; Reviews: 92 MSRP: 324. HF Vertical Antennas. Jun 22, 2023 · THIS is what most people get wrong when building their OCFD antennas. If you can not elevate the radials, consider 130 radials on the ground. Introduction. where: L — the length of the total dipole antenna in feet (ft); l — the length of the arm of the dipole antenna in feet (ft); and; f — the desired frequency. Losses on an OCF Dipole do Find Buckmaster OCF Dipole Antennas and get Free Shipping on Most Orders Over $99 at DX Engineering! Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. A vertical HF antenna can get away with Sep 12, 2020 · I haven’t posted an antenna video in a while, and I don’t think I ever covered the 17-meter band in a video. Design och struktur: HF dipole antennas consist of two equal-length horizontal elements. 4-year Warranty. The total length of the 17′ 9″ vertical element and the 25′ 3″ horizontally sloped element equals the magic number of 43 feet that so many excellent systems use for multi-band operation Dipole Antenna Wire Kit for dipoles from 160 meters to 6 meter. Most people believe the 40m OCF cannot work 15m. Regular price $1,200. 79 ohms (versus 71. Below, you'll see why the Greyline Vertical Dipole Antenna is called a high-performance HF antenna system. But I'm getting ready (saving up) to get a 10 meter ham radio and will be needing a base antenna for it. Flat Rate International Shipping >>>> Click for Assistance (888) 482-3249; alphaantenna@gmail. 1, simple short dipole antennas are shown in Section 10. These designs can operate on multiple bands. It should be noted that OCFD antennas were designed to provide low SWR for full power rating on even harmonics only, i. 00 TO 349. The vertical dipole has a very small foot print and requires no radials, 3. See full list on owenduffy. Your friends, family, and DX totals will agree whether a newly licensed amateur or a professional of industry, we guarantee it. These are considered top-notch vertical antennas. Greyline 20-foot DX Flagpole Antenna, a real Flagpole approved for ham radio in HOA, smart design for Stealth, No Radials, OCF vertical antenna, a vertical dipole, for 160-6M. It has been my primary antenna for all bands since then. They are designed to give you years of trouble-free service! Buckmaster antennas are shipped fully assembled, ready to deploy with no tuning or trimming required. The 7-band antennas need at least 120 feet of ground space end-to-end. It is complete, cut, tuned, and ready to hang. This manual will show four versions of the Off Center Fed dipole that can be made from this kit. It's a grounded vertical wire connected to a horizontal portion acting as a top hat capacitance. e. Buckmaster 7-Band OCF Dipole Antennas are 135 feet (41 meters) long and work on 80, 40, 20, 17, 12, 10, and 6 meters. Jul 8, 2015 · This antenna works great also at 15/30m Band. 15 dBi) in the horizontal plane (2). We can group them as follows: harmonic resonances 16-foot DX Vertical Antenna, an OCF vertical dipole for all band HF radio operation. The Standard Vertical Dipole Characteristics Impedance: 69. It is rated to take 2 KW. Vertical dipole antennas offer low noise, low angle, and high performance. YLs & OM of ham radio prefer Greyline. The opportunity presented itself this morning a i built one for 160M using 180/90 ft. Bonus NVIS pattern for regional, emcomm, & disaster prep. Oct 25, 2015 · A commercial antenna system, the Buckmaster 7-band OCF Dipole, exploits this property. To accommodate the four bands, the overall length of the antenna (20. the ocf i purchased is the best working antenna i have ever had wa6nrg john NI5I: I was using a Buckmaster OCF, was given your 500 watt version second hand, then bought your 1500 watt version from HRO last summer. The same thing happens with the Windom. One concern with making a multiband OCF dipole is achieving reasonable impedance on all amateur bands. One 8-inch long, 1 1/4 inch SCH 40 PVC pipe from the hardware store is used as an insulator and support between the top and bottom vertical elements of the dipole. Smarter, stronger, and more elegant all-band ham radio antenna option. Write or Call 435-200-4902 The vertical dipole or its electromagnetic equivalent, the monopole, could be considered one of the best antennas for land mobile radio applications. dipole with 28' Greyline HF Vertical Antenna / DX Flagpole Antenna Parts and Assembly; Power Point: Custom Install, Step-by-Step of Greyline 24' Flagpole Antenna KQ4EXO walks us through his custom install - helpful pictures too. The antenna is completely assembled and no adjustments are necessary, just screw in your coax and raise the antenna as May 15, 2022 · After watching a couple of videos by @timg5tm941 about the T2LT vertical dipole I figured I should make one myself. We shall see how many choose to either use a 4:1 or 6:1 balun for an OCF dipole. HF Military. 00 Sale price $799. The antenna itself is an off-center fed vertical dipole made by flipping a quarter wavelength of braid back over the outside of the coax. Increased ERP (Effective Radiated Power): The electrically balanced OCF dipole circuit of the system has an increased ERP over the base fed vertical (end-fed) antennas that use lossy matches to force low SWRs. Thanks, Bob! Configuring the Flagpole Antenna & HF Vertical Dipole Antenna. When you rotate this antenna, the difference between the strong points and the back is 4. 100% Guaranteed. In 2020 I replaced it with a similar OCFD having an improved Balun and a different feedpoint. The 40m OCF Dipole, also called FD-3, is one of the most popular multi-band antennas in Germany. Lower angle, lower noise, XYLs appreciate the aesthetics. Or simply leave the radial topic aside as you do not need them with the OCF vertical dipole, aka DX Flagpole Antenna and DXV by Greyline Performance. (This may look familiar: You may have received a QSL card with a sketched Apr 20, 2003 · Dipole Antenna Radiation Patterns Article used with permission and courtesy of John, WB4YJT - Ventenna. The GigaParts DX Flagpole Antenna is an off center fed dipole. ventenna. Antenna Static Bleeders; Broad Band Terminated Dipoles (BBTD, T2FD) Bullet Antenna Products; Coax Feed Line Common Mode Chokes (1:1) Dipole Antennas; End Fed Half Wave Antennas; End Fed Long Wire Antennas; End Fed OCF Antennas; G5RV/ZS6BKW Antennas; Loop Antennas; Off Center Fed (OCF) Antennas; Vertical Antennas; Kurt Sterba The TZ-OCF-40 is an Off Center Fed wire antenna designed to permit operation on the 40m, 20m and 10m amateur DX bands. Notoir are the EndFed, vertical, dipole and its variants like the and the OCF dipole (Windom). ". ) A dipole is a balanced antenna, meaning that the "poles" are symmetrical: They're equal lengths and extend in oppo- site directions from the feed point. dipole with Greyline HOA Flagpole Antenna and HF Vertical Antenna for multiband ham radio, 160-6M. The antenna has 50 ohm resistive impedance and doesn't need impedance adapters. I wanted another. In more familiar terms, this antenna is off-center-fed (OCF). Short Antennas "Loaded" Dipole. Longwire Antenna: The suggested balun is a 4:1 ratio current choke Tuner Balun. With a maximum height of only 20', it requires no radials, making it ideal for easy setup, yet still delivering optimum performance. This antenna I use to compare other multiband antennas. ALPHA MATCH. 80m, 40, 20m and 10m. com; Of course an antenna is an important part of propagation, so I don’t feel too bad about writing about antennas! What brought this on was a question about the OCF antenna, and I did a lot of work to understand how this particular antenna works. 6 -j2. I am sure going to build this 20m vertical dipole. worked alot of dx from africa including libya, jordan etc with 100 w on 17M. Stealth HOA Flagpole Antenna is a multiband hf vertical antenna for Real DX 160-6M. XYL-approved Elegance. Review Summary For : Buckmaster 7 Band, 300W, OCF Dipole Antenna; Reviews: 33 MSRP: 192. I am an 82-year-old Retired Episcopal Priest and did assembly myself which is good for this Extra Class ‘appliance operator’. In the case of the dipole, we were only focusing on one band. We do not recommend hanging the antenna from a metal mast or tower. Instead, use the model 4125et to allow RF to pass to the vertical coax. Includes 2 end insulators, #14 Insulated stranded copper wire and spade lugs and heat shrink for lugs for attachment to an optional balun (use 1:1 balun for most dipole arrangements). Wide bandwidth. 8-band antennas need 239 feet of ground space end-to-end. Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. The resulting antenna has a low radiation pattern and an impedance of 55 - 60 ohms. The most simple and effective solution to tackle RFI is placing a common mode choke. Free shipping. This is the same pattern as a horizontal dipole when bent into the L form. afhvgsoqnyqhwwddavrooutadjgkumzyguxftxzwzpvfpjmvdbsdpdxrnhabb
Ocf vertical dipole antenna. 8-band antennas need 239 feet of ground space end-to-end.