Ocf Dipole Installation

A half wave. Understanding Antennas For the Non-technical Ham by - An online Book! Ham Radio Antenna Adam Resurrected Walkie Talkie Radios Adam Resurrected Walkie Talkie Radios. After cutting the coax pieces, I simply connected them together and set off to the antenna's location for installation and measurement. Q:My antenna operates well but I am getting RF on the feedline, what can be done? First thing, make sure your feedline is not parallel to the legs of the antenna. theory and construction of a novel trapless center loaded off center fed cl ocf dipole or windom antenna for the 80 40 30 20 15 and 10m hf amateur radio bands. Otherwise, a center-fed dipole or inverted-V (coax fed, with a 1:1 current-mode balun right at the feedpoint) is hard to beat. com FREE DELIVERY possible on eligible purchases. Also a few shots of the roping, feedpoint and a few other things. 67 feet long at 60 meters), the T2FD provides signal gain, wide frequency coverage, and exceptionally low noise characteristics. You can install a loading inductor in each leg of the dipole with some loss. Sloping Dipole Antenna 11 16. I am installing a Carolina Windom Short 80 and am not sure which way to orient it. Fayetteville St. The antenna can be mounted as a simple dipole or inverted veeThe OCF-3K40 is complete and ready to install. SWR will be high. com **Also, feel free to provide any info you like: such as DX worked, performance, and your opinion of the antenna!** Thanks again for your business!. The OCF-3K80 dipole will work well on the 80, 40 ,20, 17,12, and 10 meter ham bands with no need for tuning. Discover ideas about Morse Code. This antenna, cut to exactly the same measurements as the tape version, also worked as well, with an acceptable VSWR on both bands. No counterpoise or ground lead is required. One or more copper rods or pipes driven, at least, 4 feet into the earth near the dwelling entry point (2 or 3, is better, being spaced about 4 feet apart). Extended double Zepp is: 89. simplest form, a dipole is an antenna made of wire and fed at its center as shown in Fig 1. 2x10 M (2x33 FT) MID-LOADED DIPOLE. 5 over the frequency range of interest. That’s right… an all-band link dipole! Since my dipole will be at ‘lower than optimal’ heights, I’ve decided to construct a 1:1 guanella current balun for this task. An ideal installation will have the balun 30 ft. See the figure below. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. Yes I realize my current dipole resonates at 3. It is an off centre fed dipole, with 10 feet of vertical radiator. The interesting thing is that it is multi banded with no traps. (house eave height) - blue 25 ft. This morning I put my Mini VNA Tiny on the dipole and was surprised to see that the SWR was a lot worse than the rig had showed me at around 2. There have been many manufactures over the years that built half wave vertical antennas that had only a few short radials. 333 feet long. Measure dipole SWR at design frequency. Whether needing an HOA Antenna or a very low loss, high-performance DX vertical dipole for all bands, our OCF antenna line does it. All antennas are completely assembled and ready to install. Software reviews for Amateur radio software packages, services, and hardware. Also, with the limited trees and their positioning, I am restricted on the usage of dipoles or other wire antennas. The 135ft 7-band Buckmaster OCF Dipole being installed using the Max Gain Systems fiberglass push up mast system (MK-8-HD). Can be used as a off center fed shortwave antenna to provide continuous coverage from 500 kHz to 60 MHz. Since 2005 my HF antenna is the Buckmaster 7-band OCF dipole. 40 M to 6 M OCF Spiral Dipole building Instructions The mechanical details of this antenna are must be followed to yield a ready to use antenna. This inspired author Belrose, VE2CV, to reopen his files on the "Windom antenna," or, more properly, the off-center-fed dipole. Definitely better than any quarter wavelength vertical, no matter how good its radial network. 80-6 meter OCF Dipole & Antenna Tuner Demo Part 2 Back. 25+ unique dipole antenna ideas on Pinterest. by Gene Preston, K5GP I read Rick Littlefield's article in the June 2008 issue of QST on off center fed dipoles and was intrigued by the idea that the antenna could be extended to cover 80 meters. You can write your own review of the Buckmaster Ban 3KW, OCF Dipole Antenna. The OCF-3K80 dipole will work well on the 80, 40 ,20, 17,12, and 10 meter ham bands with no need for tuning. Instead of connecting the feedline to the wire at the end, connect it to the middle. 8 MHz, but eventually I will lengthen it a bit. " all up at the same time" The loop recieved and transmitted almost the same as the vee but with much less noise. Part of substitution window of flexural strength elastic modulus and work of. To compare an OCF Dipole with an end-fed: I bought a well-known EFHW 80-6 M antenna and put it up at the same height almost side-by-side with my 80-6 M OCF dipole. 333 feet long. The Carolina Version. A Simple Dipole with SWR Meter 6. For best efficiency, ladder line. It is an off centre fed dipole, with 10 feet of vertical radiator. Center of the Buckmaster OCF about 35 feet and the ends 10 feet or higher. This is not really a Windom, but that's what many call it. Off Center Fed (OCF) Dipole / Windom Multi-band Antenna. Such is the nature of any OCF dipole. Ham Radio For Dummies Cheat Sheet - For Dummies. OCF 3-D pattern at 14 MHz. Quickly switch bands and eliminate a tuner as one more thing to adjust. This 6 meter dipole is high enough off the ground and away from other structures to be an effective low angle radiator. Dipole antenna gain calculator keyword after analyzing the system lists the list of keywords related and the list of websites with related content, in addition you can see which keywords most interested customers on the this website. SWLing @SWLingDotCom The Ozark Patrol regenerative receiver kit goo. 8% for one side and 62. If your loop antenna is further away from your house, you may want to feed it with ladder to keep feedline losses to a minimum. Aug 24, 2018- Explore kevinpinscoe's board "Dipole and Wire Antennas", followed by 295 people on Pinterest. 40-20-15-10m, no tuner. The longest dipole that I can fit on my terrace, albeit with a dog leg between the dipole halves, is 2 x 10 m (2x 33 ft), i. Add Review ×. The larger the wire, the wider the bandwidth. Jika anda penulis OCF off center fed Dipole Antenna dan tidak berkenan karyanya di tampilan disini silahkan buat komentar, kami akan mnindak. 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. You can write your own review of the Buckmaster Ban 3KW, OCF Dipole Antenna. I pre-gathered all the hardware I needed to put it up. Wideband Dipole for Receiving 16 24. Installation Information The antenna should be at least 10' from any metal objects such as poles, buildings, towers, house wiring, fences, or gutters that may be resonant on a frequency you're trying to work. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. I’m now waiting on a Maxcon OCF dipole which I should get this week. The Wire Size can range from 16 AWG to 12 AWG. Describe your experience with the Buckmaster 7 Band, 300W, OCF Dipole Antenna and tell us why you give it the rating you did (required). This is not really a Windom, but that's what many call it. impedance is easier for the tuner to cope with across multiple bands which are related to even harmonic lengths of the dipole. Between the ATU and the transceiver, install a line isolator (another name for the W2DU choke) at the ATU end of the cable. 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. Troubleshooting a Buckmaster OCF Dipole is much like troubleshooting a standard dipole antenna. 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. After cutting the coax pieces, I simply connected them together and set off to the antenna’s location for installation and measurement. This is a good antenna!! Very well made and strong enough to last through ice storms (unlike my HB wire antenna below). Horizontal Dipole The most used configuration for the Buddipole™ is the Horizontal Dipole. 5 - 50 MHz (yes, really!) Very Low Losses owing to the feed system and antenna design; Lower Angles than ground mounted verticals (see performance specs!). In order to select the better. Dipole Antenna. However the dipole length is not exactly the same as the wavelength in free space - it is slightly shorter. It can be fed with standard 50 ohm coax. Multi-Band Horizontal "dipole" Antennas. Extended double Zepp is: 89. AI4JI OCF Dipole Mounting, Connecting and Tips These antennas do not have to be high off the ground. Ham Radio For Dummies Cheat. --- short leg = 22 ft. Straight Horizontal For the best in DX (Distant Communications) we suggest these Antennas be installed in a straight Horizontal Mode. Ni4L Antennas & Electronics, Ham Radio Antenna, Amateur Radio Antennas, Shop with confidence, Amateur Radio, Homebrew Antennas,. or higher (for safety so no one can touch the antenna while you are transmitting) and “in the clear" away from any metal objects. The balun enclosure is much smaller, 3" x 2" x 1". This article looks at whether or not these claims are valid in a real life installation. The ½-wave dipole, even quite near the body (which you can use as a reflector if needed), works so much better than the H-T’s duck - there’s just no comparison. We suspended the 4:1 current balun at about. The CB Radio Talk Forum. A classic dipole impedance changes, and the user must intervene with different antenna tuner values, which takes time. Holding true to the original Windom formulas, I used a ratio of 37. Squelch Tale ”Antennas Springing” March 2010 MY 40M Off Center Fed antenna OCF (Jim k1jaw/qrp) My favorite antenna is, and has always been, a doublet. 40 M to 6 M OCF Spiral Dipole building Instructions The mechanical details of this antenna are must be followed to yield a ready to use antenna. This is the compact dipole used for HF communications on the set of the ABC Television show “Last Man Standing” with Tim Allen. These enclosures are purchased in large quantities to help maintain low pricing for our products and movement in the boxes sometimes cause minor scratches and scrapes. netGoogle Translate: Shopping CartProductsAuctions HamCall DVD Owner Benefits Software Features Subscriptions HamCall FAQ Third-party support User Opinions Order HamCall HamCall Member Benefits HamCall Gold Passwords HCLog OCF Dipole Antennas 7-Band OCF 4-Band OCF 8-Band OCF Features Installation Ordering Reviews FAQ PL259 Connectors Antenna Support Rope Stainless Pulleys Line-Grip. A simple multi-band dipole may be constructed by first choosing the lowest band on which operation is desired. Yes I realize my current dipole resonates at 3. OCF 3-D pattern at 18. Also, designs that did better on 80 m, lack 15 m. how you plan to operate with it. The RadioWavz VFTD series terminated folded dipole is a broadband antenna designed for fixed station, multi-frequency applications. design a 40m dipole and then load the dipole to make the antenna resonant on 80m. To summarized accounts and before exposing everything what I am related to this antenna I must clarify several things: This antenna, at least in its modality Base HF See-band, 160-80, 80-40, etc, etc, IS. This antenna, I erected on a 15 foot conduit mast at the back of my home and it is still in use as my primary dual band antenna. Probably use at least 2 or 3 clamps of some sort to the 4x4 to hold the mast up. Jika anda penulis OCF off center fed Dipole Antenna dan tidak berkenan karyanya di tampilan disini silahkan buat komentar, kami akan mnindak. Dipole resonance is lower in frequency (dipole too long). The OCF-3K80 dipole will work well on the 80 40 ,20, 17,12 and 6 meter ham bands without an antenna tuner. current balun in this design? Does the OCF dipole require feeding with balanced voltage as opposed to balanced current? Also, I've read things about voltage baluns indicating they can't handle a mismatch well - is that true? Thanks, Scott, WU2X. Typically a dipole is an electrical half wavelength long, or a multiple of half wavelengths. long overall (the size of a single band 40 meter dipole), covering 40, 20, 10 and the low end of 6 meters. We will post them here on our page and on our website www. He also offers a few suggestions for those wanting to try this dipole antenna variant. (ground level) - red 10 ft. One million US manufacturers, wholesale, resellers, contractors, and service companies lists within 30,000 product & service supply categories. I'm sure this statement will meet with a lot of opposition, especially from many of the life-long users of openwire-fed dipoles (like me), but In My Honest Opinion, it is true. 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. net Abstract A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. hoc "DX-fishing-pole" installation. A feed line is attached to an optimum point along the dipole by a BALUN. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. It can be fine tuned for lowest SWR just like a dipole antenna can. "This Old Dipole" or Dipole 101 An antenna construction workshop conducted at Marshall N1FN's QTH on Sunday, 8/2/98 Mission: Replace an old co-ax fed 40M dipole with a new one, fed with 300 Ohm ladder line and in doing so provide a "workshop" for the necessary techniques, and document the process for "posterity. This year we built an 80/40/20/10 and we suspended a 15m double-bazooka below it. 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. Browse our inventory of new, used, and vintage ham radio antennas for sale in addition to a great selection of amateur radio antenna parts and accessories avaiable at auction prices. I just passed my General and am about to install a telescopic mast with a multi-band dipole (10-80m) at 50′. Variable Folded Terminated Dipole. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. The 3 additional feet of wire will be used to fine-tune the OCF after you install it. 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. 18m) of each leg on the matching-section forms a shortened or slightly folded up half-wave dipole. With the six-watt H-T on a full 12. Over all length is 80 ft. other high duty, harsh environment customers. Firearm Discussion and Resources from AR-15, AK-47, Handguns and more! Buy, Sell, and Trade your Firearms and Gear. By the time we complete our analysis of the claims made for the OCF, you will understand why the antenna is not much different than a center-fed dipole, and certainly not significantly better. I will say the. It can be fed with standard 50 ohm coax. Dipole Antenna Calculator. 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. Alpha Antenna 10-80M HF base antenna ProMaster [10-80MProMasterAntenna] - OVERVIEW The ProMaster is a balanced limited space (permanent base or transportable) antenna that maximizes effective radiated power (ERP) while maintaining a SWR on 10-80 meters and Marine HF bands of less than 2. Such is the nature of any OCF dipole. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically without a tuner. Add Review ×. It is a wide band antenna with low SWR over the full designed frequency range: antenna tuner is seldom needed. A Simple Dipole with SWR Meter 6. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. The OCF-3K80 dipole will work well on the 80 40 ,20, 17,12 and 6 meter ham bands without an antenna tuner. With an antenna tuner, you can operate 12, 15, 17, 30 & 60m bands with ease, where most. RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, and 6 Meters the company sent me a link to their web site with very good instructions to install. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. An install that my dad and I thought would take 2 has now. The TZ-OCF-40 is an Off Center Fed wire antenna designed to permit operation on the 40m, 20m and 10m amateur DX bands. To help support the coax and choke. CobWeb Aerial Back in the summer of 2012, I decided that I wanted to build a CobWeb. Generaly speaking, due to the ease of setup, its low profile and its very attracting price, the dipole is the most used antenna, and not only in the field or for portable operations. This is a Custom Built version of the CAROLINA WINDOM® 40. 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. In fact, a half-wave dipole will often outperform many compromise commercial multiband antennas. This is a must for receive purposes too and it can easily compete vs multi-band verticals or beam due to its less sensitivity to QRM and pick-up efficiency. Describe your experience with the Maxcon OCF Dipole and tell us why you give it the rating you did (required). 2 dB gain over an isotropic radiator when the dipole is placed over earth. and a little someth. Please subscribe to my channel to get automatic notification of new videos. It can be fed with standard 50 ohm coax. Using the EFHW for 20m at GB0CMS 3. Over all length is 80 ft. Note: It is not imperative to feed the OCF antenna at the point shown. long the standard of the industry the W2AU baluns are built to last! The W2AU is the preferred Balun of Amateurs worldwide. So as far as I'm concerned the caged dipole works the best along with excellent SWR across the spectrum. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Page 1 of 14. For long term installation, you should also wrap the pl259 in self amalgamating tape. (This may look familiar: You may have received a QSL card with a sketched dipole, resembling Fig 1, to denote the antenna the other station used during your contact. On the bands above 20m it will work, but the performance may be down on what you could expect from a half-wave dipole cut for each particular band. The installation at my home. 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. Note: It is not imperative to feed the OCF antenna at the point shown. A simple installation; ideally the coax will go directly from the antenna feed point to your transceiver with no grounding, lightning arrestors, tuners, or switches in between. It shouldn't cost much for the materials and if you can get it installed high enough you should get very good performance. Current type 4:1 (200:50 Ohms) BALUN is another product designed for OCF antennas (Off Center Fed) also known as Windom antenna. Schematic, core winding layout, and enclosure drill locations 12 o-clock. These well constructed antennas are excellent performers on which ever band that you choose. The G0KYA EFHW – an end-fed half wave monoband HF antenna, plus two multiband versions (New!) A practical, cheap monoband or multiband (new!) vertical antenna that is great for DX and very cheap to build. It's also ideal for those who want a high performance antenna with world class DX coverage. You can write your own review of the Buckmaster Ban 3KW, OCF Dipole Antenna. Here is my home HF antenna. But for gen­er­al pur­pose work at longer dis­tances, it is not a good choice. With an antenna tuner, you can operate 12, 15, 17, 30 & 60m bands with ease, where most. The center of the antenna should not be higher than λ/4. Ham radio 40-meter dipole: your first antenna. Sloping Dipole Antenna 11 16. A stealth end fed wire for 80 - 10 meters. Generally OCFs work with roughly a 2:1 ratio for the two legs, but looking at the photos, it appears that they've loaded it such that both legs are now equal. May 2012 - May 24th 2014. EFHW featured in "Stealth. RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, and 6 Meters $87. The maximum radiation for an inverted V-antenna is at its center. The transformer/balun is mounted under the eave of my screen rear porch. Pos Installation of an N9SAB OCF Antenna. The OCF/ Windom is an excellent antenna that will perform quite well, both on transmit and also receive. i run into an old dentron super tuner. The CB Radio Talk Forum. Understanding Antennas For the Non-technical Ham by N4JA - An online Book!. 8 based on 16 Reviews "Talk about the best endfed antennas I've. The RadioWavz VFTD series terminated folded dipole is a broadband antenna designed for fixed station, multi-frequency applications. Can be used as a off center fed shortwave antenna to provide continuous coverage from 500 kHz to 60 MHz. 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. A Simple Dipole with SWR Meter 6. Matching to the feed-line is achieved by sliding the connection of the feedline back and forth along the stub until an impedance match is obtained. Quickly switch bands and eliminate a tuner as one more thing to adjust. i run into an old dentron super tuner. It is similar to a halfwave dipole antenna. Post #1676. Just a Dipole Gary Wescom N0GW July 16, 2007 Often we will hear people describing their antennas as ‘just a dipole’. DX-Series - Monoband Dipoles. Also, with the limited trees and their positioning, I am restricted on the usage of dipoles or other wire antennas. W2AU’s operate at a low VSWR from 1. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Stealth installation! Ham radio home-brew DIY stealth antennas, Full ham band coverage from 80m to 23cm. It is a half-wave long on the lowest frequency, and is fed from a coax cable. Current Stock Status At These Ham Radio Outlet Locations. The most simple is a 75 meter dipole fed with open wire or ladder line, tuned up on 160 meters, as shown in Figure 1. ) It should not look like a Christmas tree as viewed from the side. OCF-Dipole 80,40,20 et 10 mètres. The dipole can be straight or bent. The longer leg (90 ft or 27. I have plenty of trees but they're all lodgepole pine, so I'll have to climb up rather than throw the support ropes over the limbs. I did an A/B comparison with them between my station in northern Florida and a ham in Netherlands. DX-OCF Installation Instructions. OCF dipoles have much higher impedance(s) than conventional dipoles. Buckmaster OCF Dipole Antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. This is a Custom Built version of the CAROLINA WINDOM® 40. With an OCF, you want to feed it with balanced input. Steve Yates - AA5TB. As the name suggests, a dipole has two 'poles' or sections to the radiating element. It can be fed with standard 50 ohm coax. Moravian Falls, NC 28654 United States of America (828) 738-6445. The dipole antenna is very well known among the amateur community so this may be old hat to many. The CB Radio Talk Forum. Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. The OCF dipole does require a balun. W8AMZ Windom 6m to 40m OCF dipole Back. Note: It is not imperative to feed the OCF antenna at the point shown. 2% for the longest side after determining the half wave length at the lowest operating frequency…. Remember that our 160M and 80M antennas are actually NVIS because most of us have height limitations under 70 feet. What this really is, is an Offset Center Fed Dipole, or OCFD. We have tested the new FPA-20F-OCF with a LDG AT-200ProII autotuner (rated for 6 to 1,000 Ohm loads) at the end of 40 feet of coax to simulate a typical installation and also with an MFJ-998RT outdoor rated tuner (rated for 12 to 1600 Ohm loads) placed near the antenna. By the time we complete our analysis of the claims made for the OCF, you will understand why the antenna is not much different than a center-fed dipole, and certainly not significantly better. In the drawing above, it is shown for just four bands, 80 thru 10. Attach your coax and radio and you're on the air!. Multiple Wire Dipoles. 2x10 M (2x33 FT) MID-LOADED DIPOLE. OCF 3-D pattern at 18. The OCF Dipole is a MUCH MUCH better multi-band antenna than the G5RV. Radios Radio Amateur Dipole Antenna Hams Ham Radio Antenna Radio Amateur Dipole Antenna. The TZ-OCF-80 is an Off Center Fed wire antenna designed to permit operation on the 80m, 40m, 20m and 10m amateur bands. But wait, a choke is needed?! That wasn't mentioned on the website at all. I use the loop for rag chew I dont chase dx, maby thats why it works so well for me. May 2012 - May 24th 2014. There is a second version of the antenna that has been from time to time popular: an OCF cut essentially for 160 meters as the fundamental frequency. The G0KYA EFHW – an end-fed half wave monoband HF antenna, plus two multiband versions (New!) A practical, cheap monoband or multiband (new!) vertical antenna that is great for DX and very cheap to build. Dipole length variation from free space length. The OCF/ Windom is an excellent antenna that will perform quite well, both on transmit and also receive. MyAntennas produce quality HAM radio antennas and accessories such as BALUNs, UNUNs, Common Mode Filter Choke / Line Isolators, End Fed Antennas etc. The antenna was created for the 40 meter band and above. It needs no tuner on 40m, 20m and 10m. 8 to 40 mHz, and handle powers up to 2 KW PEP (at SWRs of less than 3:1). Halfwave Reflector is: 34. Buckmaster 7 Band, 300W, OCF Dipole Antenna product reviews by real people like you. 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. rfi, Radio Frequency Interference. Any azimuth or elevation slice can be highlighted. Describe your experience with the Maxcon OCF Dipole and tell us why you give it the rating you did (required). So the measurements are based on a 40 meter 1/2 wave dipole. I bought an off-centre fed dipole for 80m to 6m to replace my G5RV Jr and discovered the hard way that it was too big for the yard. discussed aspects of the behavior of off-center-fed (OCF) antennas used for multi-band HF service. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. 5kW OCFD POWERLITE DIPOLE. The center connection is an old Carolina Windom 4:1 current balun fed with RG-8X. We suggest using high test fishing line or rope. The horizontal dipole, however, is most effective when its height above ground is at least 3/8 of a wavelength. design, OCFD antennas work on even harmonics and They are in no way the same antenna. It's also ideal for those who want a high performance antenna with world class DX coverage. I intend to keep both. I’m a brand new ham (general) and my first antenna was an alpha antenna fmj 80-6meter. Yes I realize my current dipole resonates at 3. as well as polar charts of far field radiation patterns and 3D flyover views as a bend point is moved or angle of bend chan ges. you need and it works the same. When I was using the 40m Windom I could tune the 30m band without difficulty but the high impedance nodes occur in different places on the 80m OCF and make 30m over 10:1 SWR. degrees (flat top. The dipole, purple lines, will be run towards the tree out front (25ft leg) and to some point in the back(41ft leg). I have a OCF dipole to install that is approx. OCF Antennas. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Measurements of 80m Dipole with Transmission Line Resonator. 29 one side. DX-OCF Installation Instructions. I also wanted to get a decent antenna for 30 Meters, and I like vertical dipoles because one does not need the huge radial field a monopole does. specification wire antennas in mind for the amateur, commercial, MARS, and. 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. Also, designs that did better on 80 m, lack 15 m. pdf PDF-Dokument [759. This review of the 30 Meter Mono GAP, (see my review of the GAP Challenger), was prompted as a first phase for a test bed for constructing a 30 Meter 4-Square phased array. The Hy Power Off Center Fed Antenna is a very efficient and effective multi band antenna.