The hy power ocf80 80 meter version shows a positive swr dip on the following bands. Getting a big dx signal on 16010 m from one small, low antenna chuck counselman, w1his i live on a small lot in a dense, inner suburb of boston and cambridge. Windom ocf dipole 80 6 meters 7 band hf antenna ebay. On the other hand, an ocf dipole is an ungrounded dipole antenna fed with twin conductor line, either coaxial or open wire parallel conductors. Shop our selection of alpha delta wire antennas, including multiband sloper antennas for limitedspace applications and swl antennas for superior performance through 30 mhz.
This link is listed in our web site directory since sunday oct 20, and till today 80m ocf dipole has been followed for a total of 1700 times. Ocf antennas are very convenient as they will allow multiple bands of operation with a simple wire antenna which is fed off center with a 4. I highly recommend this antenna to anyone who wants a dependable, rugged wire antenna. Update, i have been using this antenna with ft8 software. If you raise the center the 50 you need to raise the ends by the same amount, to 30. One of the first stations worked was in siberia on 20m. Wire antennas are a great simple way to work 40m and 80m rather than a noisy vertical antenna that requires horizontal radials. The radiowavz dx ocf windom is ideal for those of you who do not use a tower and beam. This is a popular antenna design as the performance is very good across the hf bands and requires little or no tuning. Buckmaster 7band 300 watt ocf dipole antenna click for larger image our 7band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters, with no tuner required. Sold by crs communications and ships from amazon fulfillment. Offcenterfed dipole antennas category is a curation of web resources on, ocf dipole, the six meter ocf sleeve dipole vertical, centerloaded offcenterfed dipole 6 band.
Dec 26, 2019 he thinks that the radio and tuner are think it is a ocf and thus is why i cant tune it up on 40 and 75 meters. Its also ideal for those who want a high performance antenna with world class dx coverage 80, 40, 20, and 10 meters. Buckmaster ocf dipole antennas dxocf free shipping on most. It covers 154 mhz with almost perfect vswr terminated. Short wave listeners will love this antenna because of its low noise reception. Please subscribe to my channel to get automatic notification of new videos.
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 id try and find a good ocf dipole for use while in the field. Jun 14, 2019 in a perfect world i would have one dipole wire for the 30m test with two feed positions. Study of g0fah off centre fed dipole ocfd 40m20m15m 10m 40m 20m 10m the g0fah 4band antenna is modelled using mmanagal basic freeware antennal analysis software. I will mount the matching box on a wood pole instead of a metal flower hanging hook. Details about windom ocf dipole 80 6 meters 7 band hf. They are designed to give you years of troublefree service. The main category is homemade projects for 80 meter antennas that is about antenna projects for 80 meters band. If you found this video useful, please share using the share button below. The feedpoint impedance at the offset is at or about. Again you will have a good match for 50 ohms coaxial cable and now have the makings of a long wire antenna with gain. Buckmaster ocf dipole antennas are made from the best quality materials with a completely potted waterproof balun and no external connectors. Offcenterfed ocf antenna faq frequently asked questions q. 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. The magic dimensions of the ocf vary from writer to writer.
Icom ic718 radio and accessory bundle 6 items includes 100w hf base radio, icom sm30 desk mic, samlex 23a psu, ldg autotuner, radiowavz ocf dipole antenna and ham guides tm quick reference card. Offcenterfed dipoles ocfs are 12wavelength wire antennas fed at neither the. Building an offcenter fed ocf dipole loudoun amateur. This antenna is ruggedly built, with strong metal buckle wire connections, waterresistant balun. Buy ocf dipole 7 band 806 meters antenna polystealth 61 core. You need an environment free from long lengths of metal. Works 4, 7, or 8 bands on one length of wire, with no tuner required. The reason behind this is that like a tuning fork an antenna will perform best.
We rate the wattage on our antennas at exactly what we think they will do, so a 300 watt antenna really will support about 300 watts. The ocf fd4 fd3 windom antenna fd4 80402010 m the 4band fritzel model fd4 is a special version of a windom antenna. It is a halfwave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at onethird from one end. The feed line must be within 30 of perpendicular to the dipole and extend a quarterwavelength to minimize the coax from becoming part of the antenna. A windom antenna is a singlewirefed antenna which is worked against ground. This trimming method requires the antenna wire to be intact at its center. Our 7band antennas are ocf offcenterfed, with a 45 foot leg and a 90 foot leg, totaling 5 feet. Offcenterfed dipoles ocfs are 12wavelength wire antennas fed at neither the center. Start with a slightly too long stretch of antenna wire.
A windom antenna is a single wire fed antenna which is worked against ground. The vswr through the stepup transformer for the endfed is. Ocf 4010e3k ocf antenna windom this is ocf dipole wire antenna also known as windom antenna fed at 19% from one end. The shortwave antenna how it works which ones work best. Mogpie is a software development company owned by m0cvo antennas that. We offer a variety of multiband and allband dipoles that provide great receiving performance with low swr. Just hang up a wire or put up a pole and run another adjustable length wire or pole off to the side. Ocf 2meter sleeve dipole antenna a 144 mhz dipole antenna made from coax, pvc pipe, and aluminum foil tape ocf dipole. I built this antenna for a christmas present for another ham who has limited space. The price is about half that of other similar ocf antennas.
Sep 05, 2015 building a simple multiband antenna that works, by the consultant hugh james latimer september 5, 2015 july 29, 2017 i consider the ability to communicate in a teotwawki scenario, and being able to obtain information outside the immediate area, critical. Trying work the bugs out of it before i give it to him. Off center fed dipole antenna for the hf bands and 6 m, from 3 to 54 mhz. By contrast, the alternative trimming method starts off with the dipole cut at the middle. A random length outdoor wire antenna installed as high above ground and as far away from buildings and power lines as possible will generally give quite satisfactory results. We have used an antenna electrically equivalent to this for over 7 years with outstanding results.
Onair testing seemed to indicate that the ocf dipole antenna works quite well. Ocf 8010e3k ocf antenna windom this is ocf dipole antenna also known as windom antenna fed at 19% of one end 1981% ratio. Company website for m0cvo antennas, complete with product background. Buckmaster ocf antennas are made from the best quality materials and are designed to give you years of troublefree service. Our 7band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters, with no tuner required.
Keeping the antenna at least 10 away from resonant lengths of metal. Ver2calwireantenna actuallyaver2callyorientated resonate12wavedipolewith theearthbeingthe return half duetopoorground conduc2vitya. The normal windom is described as having a length leg, and a 23 length leg. By the way, harbor freight tools is a great place to pick up an assortment of shrink tubing. For a coaxial fed, one antenna do all you cant beat the off center fed antenna. Building an offcenter fed ocf dipole 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. Offcenterfed dipole antennas category is a curation of web resources on, ocf dipole, the six meter ocf sleeve dipole vertical, centerloaded. Radios, ham radio antenna, electronics projects, communication, software, survival. The modern common windom antenna is not an original single wire fed windom, but rather an offcenterfed or ocf two wire feed dipole. I run 4nec2 flawlessly on gnulinux using the equally free playon linux software. 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.
Study of the off centre fed dipole antenna g8ode short long feed point the off centre fed halfwave dipole the offcentre fed halfwave dipole, more commonly referred to as the ocfd, is very popular because it offers good performance as a multiband antenna using an antenna matching unit in conjunction with a 4. It all started with the windom antenna windom antenna the windom was once a very popular multiband antenna. However, any ocf dipole easily outperforms aforementioned obtrusive. By the use of antenna modeling software 10, this article is to expand our general knowledge relative to angleofbend and offcenterfeed ocf configurations of the l antenna. An outdoor shortwave antenna will always give better results than an indoor one. Its a grounded vertical wire connected to a horizontal portion acting as a top hat capacitance. Windom, w8gz who first published details of his antenna design in 1929.
Building a simple multiband antenna that works, by the. The windom is just a horizontal halfwave of wire on the lowest frequency of. Hf dipole antenna this antenna software will help you design a simple wire dipole antennas for 1 30 mhz. Jun 06, 2018 my 40m dx dilemma explained using mmana software modelling and realworld experience to cure my problem of achieving dx to both usa and vk, ideally better than 5db gain at 5 degrees off the horizon.