Homebrew Ocf Windom Antenna

Windom balun made with surplus ferrite rods. Here is my home HF antenna. While it is usually hung from a pole or in a tree, it works when used in a "grasswire" mode. Its best to do this with the antenna in the position that it will be used. Even though it is a "compromise" antenna, it has good overall performance on most hf ham bands when used with an external tuner, and allows coax as an entry feedline to the radio equipment eliminating the need and hassle of ladder line or twinlead. I am a fan of the OCF dipole, but not of the Windom, which is a completely different type of antenna. A wide range antenna tuner may be needed to operate the other bands between 60 and 10 Meters. Carolina Windom vs. Eko on A Homebrew Poor Man Antenna An… Aries on A Homebrew QRP Pocket Size VSW… Jaybe on Homebrew SWR Meter: Arifin on A Homebrew Poor Man All-Band W… Eko Adi sukiswo on A Homebrew Poor Man Antenna An… Eko Adi sukiswo on A Homebrew Poor Man Antenna An… Rosadi on A 13. Building 1meter windom – Ozaukee Radio Club A Off-Center-Fed Dipole. WINDOM=20 ANTENNA. It can be fed with standard 50 ohm coax. It was too low I think. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end. It will provide years and years of great service and great contacts. The page describes a Windom antenna with a 6:1 homebrew transformer. With a 6:1 Balun transformer is possible to feed easily by using a coaxial cable of 50 Ohms (300/6=50), like BROAD-PRO 50 (www. Overview - This is the 6-40 meter Alpha OCF Dipole Antenna. 136 feet (45. Fritzel FD4 OCF Dipole. 7-Band OCF Antennas Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters, with no tuner required! Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. When 9/11 occured, I figured that one way to help out, (and to have my own emergency communications) was to get my Amateur Radio license (Call sign KG2V, ex KC2IXE), and join NYC ARES. ó , kdyh kdg \rxu pxowledqg hqg ihg dqwhqqd lqvwdoohg khuh lq 6lqjdsruh iru d ihz zhhnv qrz dqg dp yhu\ sohdvhg , xvhg wkh zluh iurp p\ suhylrxv dqwhqqd zklfk lv ihhw orqj ,w zrunv ehdxwlixoo\ , kdyh lw. However, it is up only about 4m height from a metallic roof. By serendipity, it also covers the 17 and 2 meter bands. This antenna is much the same as that shown in figure 2. At 100 watts, typical on HF, your feed line should be able to handle the load presented by the antenna on any band, and a 300-watt tuner would probably suffice. In the total length of this antenna is 41m, height is about 11m, and diameter of element is 2mm. Antenna can be installed: horizontal, vertical, inverted l or sloper. Discover (and save!) your own Pins on Pinterest. It's a dipole, fed 14% off center with a 4:1 balun. Its reputation for excellent performance is so good that it served. The 4-band Fritzel model FD4 is a special version of a Windom antenna. I am sure going to build this 20m vertical dipole. Your configuration should work and not be affected by the slight L shape. The main category is Multiband Antennas that is about Multiband Antennas. The W0BTU antenna covers more bands than either the G5RV or the ZS6BKW. This style windom has a 4:1 balun and is rated for 1500 W. But others say that it radiates best in the direction of the ends. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end. There is no trlbander. It needs no tuner on 40m, 20m and 10m. Performance was better that I expected!!! Even worked on 80m and 160m at reduced power. At 132 feet it is. As a matter of interest, we use the Windom BUXCOMM model 802134 up to 2 meters (146 MHz). The original Windom antenna (devised in 1928-29), named after Loren Windom, W8GZ. Don't know the maths or the theory, but this antenna works as well as a G5RV. VK6AAL - Windom. Antenna hight: 25 ft. However, it is up only about 4m height from a metallic roof. The OCF doublet (which a lot of people call a "Windom" -- even though it's not) is not a balanced antenna, and should not use a balun. 6 m), and was installed at a height of 20 ft (6 m). Delta Loop Antenna. The feed-point of this type of antennas (off center) has an impedance of about 300 Ohms. It needs no tuner on 40m, 20m and 10m. Cebik, W4RNL Off-center-fed (OCF) antennas seem to offer the amateur with limited space a solution to the problem of being able to work many HF bands with a single wire element. Windom balun made with surplus ferrite rods. Over in the United States, interest in the archaic Windom antenna was again revived, lead by the 1978 article in Ham Radio Magazine written by John Nagle, K4KJ (SK) [2]. The Isolated Off-Center-Fed Antenna: Some Less-Explored Facets L. Single wire fed Windom 80m long. Off-center-Fed dipole Antennas is a curation of 13 resources about, OCF Dipole, The Six Meter OCF Sleeve Dipole Vertical, Center-Loaded Off-Center-Fed Dipole - 6 band, 80m OCF Dipole, Windom off center fed antenna 80-10 mt. Discover (and save!) your own Pins on Pinterest. Here is my home HF antenna. 135' dipole w/ladder line? 13. (Half Size) Ham Radio Antenna: This project gives instruction on how to build my version of the G5RV wire antenna that is used on the 10-40 Meter Ham Radio bands (28MHZ to 7MHZ). What ever length you go with (experiment), siting the feedpoint away from the house, or any source of interference, makes a big difference. But others say that it radiates best in the direction of the ends. Current type 4:1 (200:50 Ohms) BALUN is another product designed for OCF antennas (Off Center Fed) also known as Windom antenna. com Free Ham Radio Classified Ads from QTH. All the power goes up to thefeedpoint with coax and very little comes back because we will CHOKEit ! For this design we look at a resonant dipole for the lowest band desired and feed it off center with a balun. 5 across both bands. Operation on 12,15,17,30,60,80m will be tuner dependent. 3-band OCF wire antenna 2KW. I do need to make a correction in calling the EFHW a non resonant antenna. The antenna can be mounted as a simple dipole or inverted veeThe OCF-3K40 is complete and ready to install. This time we join Gil in building the slop bucket 2. Now, how was a Windom antenna developed? It began with a center-fed, half-wave dipole. Click Votes Antennas Windom * 6 band windom anten 80-40-20-17-12-10m, TA1CD. They are well made to withstand the sun and weathering for many years and the 40-6 OCF antenna will fit nicely in my limited space application. Wire antennas are a great simple way to work 40M and 80M rather than a noisy vertical antenna that requires horizontal radials. They are designed to give you years of trouble-free service! Find Buckmaster OCF Dipole Antennas DX-OCF-40 and get Free Standard Shipping on orders over $99 at DX Engineering!. So one leg is 44. Multiband Dipole Antenna 10 14. Current type 4:1 (200:50 Ohms) BALUN is another product designed for OCF antennas (Off Center Fed) also known as Windom antenna. Off-Center Fed Dipoles Recent addition 2feet long (located at abt feet Fed feet from one end 4:homebrew balun 2on 160M and 1on 80M at resonance 2:BW). 270 feet (90+180) long. 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. Design and antenna modeling. The Windom (or OCF Dipole if you prefer), offers a true multi-band, experience without much use of a tuner. A 9:1 Balun For Your End Fed Antenna End-Fed antennas do have their place in radio and other communications work. However,=20 it is up only about 4m height from a metallic roof. Hello Operators. placed somewhere between 40 and 20 percent from one end of a an antenna, instead of in the center. The Windom antenna has been around forever it seems. Alpha Delta Communications: wire antennas, traps, dx-ocf, -Openfos - OPENFOS is a leading Business search and directory serving the US B2B community. Made in the USA. The correct lengths for the various models will be displayed in the chart. Its reputation for excellent performance is so good that it served. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. It's a dipole fed off center with a 4:1 current balun at the offset feedpoint. We specialize in wire antenna systems. MyAntennas produce quality HAM radio antennas and accessories such as BALUNs, UNUNs, Common Mode Filter Choke / Line Isolators, End Fed Antennas etc. If you make the length the same as recommended by G5RV (about 27m in total), it will probably present more favorable loads to your matchbox than a full-size 80m dipole fed with the open wire. Antenna hight: 25 ft. OCF, Windom, New Carolina Windom) Estonia on 30m, Update on New Carolina Windom. 73 m Total 38. Historically all began with the Windom, a multi-band antenna first described in 1929 by Loren G. Operation on 12,15,17,30,60,80m will be tuner dependent. WINDOM=20 ANTENNA. If you mean an OCF doublet and not a real "Windom," the problem of course is the matching transformer. 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. Most transmitting antennas link from the top of this page. Windom Antenna 6 7. Random Length Radiator Wire Antenna 6 6. Find many great new & used options and get the best deals for Off Center Fed Dipole/ Windom Antenna OCF8010E-3K 80-10 Meters Rated at 3KW at the best online prices at eBay!. The Fritzel FD4 antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Home; Antennas; Homebrew; Radios; Others. Used a G5RV for years then had a break of some 20 years. Background. The homebrew beam design was optimized with AutoEZ. I use this formula, 468 divided by 3. Or is there a better attic antenna for maximizing a Flexradio? I'm liking the OCF/Windom so I don't have to have traps and can get the multi-band out of a dipole since it's unbalanced. Last updated on October 14, 2019. Banyak sekali all-band atau multiband antenna dari kawat yang bisa kita jumpai dan memungkinkan untuk dibuat, diantaranya yang cukup termashyur adalah Windom Antenna (OCF Dipole = Offset Centre Feed Dipole), G5RV, G7FEK, Loaded Dipole, dll. Add to cart. All the power goes up to thefeedpoint with coax and very little comes back because we will CHOKEit ! For this design we look at a resonant dipole for the lowest band desired and feed it off center with a balun. 80/40m Dipole. Carolina Windom vs. It will provide years and years of great service and great contacts. To achieve this the Windom uses a 4:1 voltage balun, which matches the antenna's leg voltages and then uses a separate 1:1 choke balun to isolate the feed line from the vertical radiator. This style windom has a 4:1 balun and is rated for 1500 W. 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. Here is my home HF antenna. Resources listed under OCF Antenna category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. I modified this antenna originally used as Inverted-V type of 80m band Dipole a little. The New Carolina Windom Antenna As with all ham stations QRO or QRP, ten percent of a station’s success in quality QSOs is the equipment and the operator. Такива антени се наричат още OCF (out center feeding) антени. 160m, 80m, 40m, 20m,10m It's also ideal for those who want a high performance antenna with world class DX coverage. Does anyone have a MHz plot of a 160m OCF dipole please? Other ideas for wire antennas could include an off center fed dipole. I wouldn't be embarrassed to admit to using one. Here is my home HF antenna. 8% for one side and 62. It therefore made sense to have an OCF antenna. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. The Carolina Windom, however, wants the feed line to radiate (at least a portion of it) in order to gain the vertical radiation and some performance. The term off-center-fed (OCF) dipole is preferred. With the middle at 30 feet and the ends at 10 feet the 7-Band antenna requires about 120 feet of ground space. This is a 4-1 made from a wire speaker, it seems easy drilling works are quite difficult because the hole accuracy is important, the other material is cable lug, pvc pipe 11/4'. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. It is also installed horizontally, but at an angle with respect to the walls. Place a 1:1 Balun on the Antenna end of the Feedline. You also need to consider the power ratings of the feed line and antenna tuner. The OCF Spiral Dipole can be matched with a small tuner. The antenna was matched directly to the transmitter ( = no feedline) with a parallel-resonant transformer circuit (a Fuchs-circuit, as described in the Introduction section). This antenna wil be resonate on 6,10, 20 & 40m. A quick fun through the bands showed almost no need for a tuner, and great reception on 75, 40, 20, 17, and 15. One of the antennas I found was the Windom. Windom OCF DIPOLE 80- 6 meters 7 Band HF Antenna. The Handbook of Antenna Technologies aims to present the rapid development of NEW: Springer Rentals + + + Offer: Save 50% on Books in Life Sciences. 2(b): But when erected as an inverted-V you gain a couple of S-points (10 - 12dB) in the. to try some multi-band wire antennas and compare performance. In the total length of this antenna is 41m, height is about 11m, and diameter of element is 2mm. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. EWE Antenna 9 12. I basically lengthened each side of a 40m dipole to the max size for my lot and use a tuner. This is how OCF antennas gained an unfair reputation of being provokers of RFI. FD4 (80/40/20/10 m). Fritzel FD4 OCF Dipole. Historically all began with the Windom, a multi-band antenna first described in 1929 by Loren G. 99 shipping. The antenna is in place, optimized, and operational. So the measurements are based on a 40 meter 1/2 wave dipole. Transmitting: Pictures of some transmitting antennas at my station. It will provide years and years of great service and great contacts. always appreciate your input @k8md. "Nearly all especially successful stations on 160 use a vertically polarized antenna of some type for transmitting. Your configuration should work and not be affected by the slight L shape. It will work 80-10 with the built in tuners found in most radios today. The antenna was created for the 40 meter band and above. It is an off centre fed dipole, with 10 feet of vertical radiator. These antennas are ready to go and built to last. Danny is a former Cushcraft antenna engineer and was responsible for many of their verticals and yagis. Antenna can be installed: horizontal, vertical, inverted l or sloper. If "Yes" to #1, what did you use to "defeat" the pitch of the roof to get the entire Windom off the shingles? If "No", any suggestion for what to use to accomplish this? Is longer PVC (perhaps thicker) sufficient?. All the products are designed and built by me, Danny Horvat, an antenna design engineer, also know as N4EXA and E73M, licensed amateur radio operator. When I travel, I take one of these made of #22 insulated hookup wire. OCF, Windom, New Carolina Windom) Estonia on 30m, Update on New Carolina Windom. Off-Center-Fed Dipole, OCFD, Windom. Ever since I got active again, the commercial multi band dipole that I had been using for many years was no longer working optimally. 3KW Version Our 7-Band antennas cover 80, 40, 20, 17, 12, 10, and 6 meters, with no tuner required! Our 7-Band antennas are OCF (off-center-fed), with a 45 foot leg and a 90 foot leg, totalling 135 feet. Mpn: FOCFD-80-6. The New Carolina Windom is essentially an off-center-fed (OCF) dipole. In many practical realisations of off-center-fed antennas, the third feed point task of preventing the flow of RF currents on the outer sheath of the coax is often overlooked. Having a 50m fibreglass tape measure is essential when building HF antennas. For most Windom users, we install our BUXCOMM 802134 Windom in the Horizontal or "flat-top" plane as we would with any other Multi-band antenna. Tuning is carried out in the same way that you would tune a standard 40 meter dipole. I've also considered with the doublet or the homebrew. The company which sells the antenna says that because the antenna. A Non-Ideal Way To Install An 80m OCF Dipole Building a "Dirgly Balun" to Make a Windom Antenna from a RadioWavz OCF Dipole Does Antenna Size Matter? 6 inch Dipole. The company which sells the antenna says that because the antenna has a vertical section which radiates; the antenna is omni-directional. This morning however I did make a contact to Topeka, KS so I know it gets out. He has a balcony on the rear (south) side, but high buildings are very close, he has no direct sight in any direction. (Half Size) Ham Radio Antenna: This project gives instruction on how to build my version of the G5RV wire antenna that is used on the 10-40 Meter Ham Radio bands (28MHZ to 7MHZ). It was quite noisy, and leaked a ton of RF into the shack, even with the appropriate counterpoise. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands only available with an antenna. All the products are designed and built by me, Danny Horvat, an antenna design engineer, also know as N4EXA and E73M, licensed amateur radio operator. I am using a home brewed OCF now around that length with a current balun and I plan on staying with an OCF for years to come due to it handling the lower bands. Delta Loop Antenna. They are well made to withstand the sun and weathering for many years and the 40-6 OCF antenna will fit nicely in my limited space application. 99 Toyota Headlight Windom 2002 (Passenger) - HID RH & NBT Bulb w/o Ballast Ballast NBT w/o Bulb Toyota HID RH - Headlight & 2002 Windom (Passenger). It's also ideal for those who want a high performance antenna with world class DX coverage 80, 40, 20, and 10 meters. 667 feet long, and the other leg 91. K1POO 4 Band Off Centre Fed Dipole (40-20-15-10m ) MMANA-GAL K1POO Antenna model's 3D far field results The antenna at 8m height above real ground 5mS/m and dielectric 13, SWR ref 200Ω. The Maple Leaf Studio offers some excellent antennas for those of us with limited mechanical abilities. However, it is up only about 4m height from a metallic roof. Antenna can be installed: horizontal, vertical, inverted l or sloper. FD4 (80/40/20/10 m). This is a Custom Built version of the CAROLINA WINDOM® 40. OCF 4 BANDS 40-6 HF WINDOM ANTENNA Poly-Stealth Ni4L Antennas & Electronics, Ham Radio Antenna, Amateur Radio Antennas, Shop with confidence, Amateur Radio, Homebrew Antennas, Hf Radio Dipole Antenna Ham Radio Antenna Shtf Weave Over Ear Headphones Bob Copper Bands. They are affected by height above the ground and surrounding objects. Here is my home HF antenna. THE OCF FD4 (FD3) WINDOM ANTENNA 19 may 2011. 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 RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. This is a 4-1 made from a wire speaker, it seems easy drilling works are quite difficult because the hole accuracy is important, the other material is cable lug, pvc pipe 11/4'. There is no trlbander. The biggest and best ham radio classifieds on the web! Buy, sell, trade HF and VHF equipment, towers, antennas, rotators and more!. This time we join Gil in building the slop bucket 2. 2(b): But when erected as an inverted-V you gain a couple of S-points (10 - 12dB) in the. This is about the OCFD and not a Windom, Carolina Windom, or End-Fed Zepp. I feed it 44. placed somewhere between 40 and 20 percent from one end of a an antenna, instead of in the center. Windom baluns for kilowatt range OH7SV (See an enhanced 2014 balun here)Windom balun made with Amidon ferrite toroids. It will provide years and years of great service and great contacts. One million US manufacturers, wholesale, resellers, contractors, and service companies lists within 30,000 product & service supply categories. What this really is, is an Offset Center Fed Dipole, or OCFD. All the power goes up to thefeedpoint with coax and very little comes back because we will CHOKEit ! For this design we look at a resonant dipole for the lowest band desired and feed it off center with a balun. homebrew 4 to 1 balun untuk windom antenna Ini adalah 4-1 balun yang diperbuat daripada speaker wire,nampak mudah kerja-kerja driling agak sukar kerana ketepatan lubang adalah penting,bahan lain adalah cable lug,pvc pipe 11/4". The antenna was created for the 40 meter band and above. I do need to make a correction in calling the EFHW a non resonant antenna. Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. It was designed to cover 80, 40, 20 15, and 10 meters. During the years, similar antennas were developed and are generally called Off Center Feed Dipoles. Hello Operators. This is a difficult question to answer and there is no one answer which is best for everyone who asks this quest…. It is an hybrid antenna mixing properties of a dipole and a vertical. A simple, nearly invisible, multiband wire antenna with reasonable gain, low angle of radiation. 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. Even though it is a "compromise" antenna, it has good overall performance on most hf ham bands when used with an external tuner, and allows coax as an entry feedline to the radio equipment eliminating the need and hassle of ladder line or twinlead. The New Carolina Windom Antenna As with all ham stations QRO or QRP, ten percent of a station’s success in quality QSOs is the equipment and the operator. T2FD Antenna Tape Measure Beam— optimized for RDF by WB2HOL Transmission Line Calculator — from AA3RL Transportable Vertical Antenna — from CT1BYR. In my book “Introduction to Antenna Modelling” I talk about how you can get more bands out of a 40m off centre fed dipole (OCFD – sometimes incorrectly called a Windom) by adjusting the feed point position. 5 to 28 MHz does not use traps or require antenna coupler. Balun Designs LLC - When Performance Counts & Quality Matters Model 4115ocf - 4:1 for OCF Dipoles 1. The only difference is the feeder. It was by Windom's name that the antenna became known. 9 MHz Full-Wave Loop Antenna. During the years, similar antennas were developed and are generally called Off Center Feed Dipoles. OCF, Windom, New Carolina Windom) Estonia on 30m, Update on New Carolina Windom. The New Carolina Windom is essentially an off-center-fed (OCF) dipole. Any thoughts or experiences with these antennas as compared to a half-wave dipole?--. On the low bands, the CAROLINA WINDOM 160's rivals are few, if there are any at all, but you need a lot of room to put one up. Tools Checker. A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. The feed-point of this type of antennas (off center) has an impedance of about 300 Ohms. Transmitting has been done on a Carolina Windom and also a 55' random wire/counterpoise antenna on 80-6M. WINDOM OCF Antenna 10-160m 1Kw 256ft. The Maple Leaf Studio offers some excellent antennas for those of us with limited mechanical abilities. Over in the United States, interest in the archaic Windom antenna was again revived, lead by the 1978 article in Ham Radio Magazine written by John Nagle, K4KJ (SK) [2]. My TX Antennae. On40 meters. Dual double cores, total of two (2) 2. But it also has disadvantages as it needs a tuner and a good earth connection. Dipole Antennas - Performance, Quality, Service. i had used an OCF at my other station in Nova Scotia for years with great success, so when it came time for a new antenna here in Maine, it was a no-brainer. Some key issues have been RF getting back in the shack which was a concern on an OCF antenna. Consistently, whether OX or local, the Windom wins over the inverted vee by about an S-unit. My EFHW 20m antenna is a decent performer, so I’m thinking that an 80m version could be an option. It will provide years and years of great service and great contacts. I call this homebrew project my "Fishing Reel" antenna. G7FEK Limited Space Antenna G7FEK Multi-band “Nested Marconi” Antenna - 2008 Version (rev 5) This antenna was first conceived as a simple dual band antenna in 1988, in an attempt to achieve sensible dual band operation in a small garden of 14m (46 ft) length. K1POO 4 Band Off Centre Fed Dipole (40-20-15-10m ) MMANA-GAL K1POO Antenna model’s 3D far field results The antenna at 8m height above real ground 5mS/m and dielectric 13, SWR ref 200Ω. 한쪽으로 치우쳐 급전하므로 OCF (Off-center Fed) 또는 OCFD (Off-center Fed Dipole) 등으로 부르기도 합니다. The only difference is the feeder. OCFs are derived from the Windom antenna, a 1929 concoction using a single- wire feed attached to the antenna element at what was believed to be the 600-ohm point. Antenna analysis software by Roy Lewallen. The Windom antenna is an Omni-directional, off-centre-fed, wire type antenna, that when installed at 35 to 55 feet above ground will exhibit a feed point Impedance near slightly more). I've always been at least slightly interested in ham radio, in fact, back in college, I often hung out at the ham radio station. Feeding the OCF dipole at a point that is one-third of its. A 9:1 Balun For Your End Fed Antenna End-Fed antennas do have their place in radio and other communications work. Antenna 160OCF3 OCF WINDOM 160m 3kW. This review of NI4L's 7 band OCF dipole was prompted by my needing a quick deploy multiband antenna for both field day, and for RVing. antenna manufacturers, or compared to resistor loaded antennas, the Carolina Windom is a regular paragon of virtue. It is an off centre fed dipole, with 10 feet of vertical radiator. MENJUAL KOMPONEN RADIO : Transistor Mosfet, Varco, trimer, IF Biru dll. The 59-73 Extreme OCF Dipole. Over the last few decades, the G5RV antenna has become one of the most popular and widely used "all around" multi-band antennas in the world. No RFI in the town, running 1200 watts from 160 to 10 on an Fritzel FD-4 with AMA 83 balun, nor my homebrew OCF with 1:6 and 1:1 balun, used here on Jota/Joti, holliday etc, both lengthened with an 190 micro Henry coil and 30 feet wire on the short side for 160 meters. 135 feet (45+90) long. That's just a fact. com in 2 categories. Radio Works Wire Antennas products from Ham Radio. LA-320 Loop Antenna : LA-350 Loop Antenna: LA-380 Loop Antenna: LA-390 Loop Antenna: LA-800 Loop Antenna: WL-500 Window Loop Antenna: Apex: 303WA Vertical Antenna: 700DTA Active Antenna 0. Made to handle the elements; Used by DX contesters all over the world. EWE Antenna 9 12. Power: 1500w SSB/PEP 200w CW 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. 5 feet long and the other leg is 90 feet long. I do need to make a correction in calling the EFHW a non resonant antenna. This antenna has been constructed to meet the homeowners covenant restrictions saying no visible outdoor antennas except for dish TV etc. Thank you for purchasing and using the Chameleon AntennaTM 40 Meter Windom (CHA WINDOM 40) antenna. Carolina windom vs. If part of the antenna, feed line or antenna mast come into contact with a power source any type, it may result in serious injury death. 2% for the longest side after determining the half wave length at the lowest operating frequency…. The matching tuner must be always readjusted when switching from one band to another. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. On the low bands, the CAROLINA WINDOM 160's rivals are few, if there are any at all, but you need a lot of room to put one up. It can be fed with standard 50 ohm coax. 5 mtr mid--loaded dipole, put it where the "Cobra" is (see the green antenna in the diagram below), and see what happens?. In many practical realisations of off-center-fed antennas, the third feed point task of preventing the flow of RF currents on the outer sheath of the coax is often overlooked. However, it is up only about 4m height from a metallic roof. This is important because if the mast extends above the antenna ground plane it will affect the performance of the antenna. In 2014 December 21 renewed my licence and for easy startup on HF bands AGAIN rised an OCF with homebrew 2xFT140-43 core symmetrical current balun. OCF 8 bands 160-6 HF windom antenna Flex-Weave. However, it is up only about 4m height from a metallic roof. This is the second NI4L antenna I have bought in the last two years and since the first one worked so well, I bought my second one from him. As a matter of interest, we use the Windom BUXCOMM model 802134 up to 2 meters (146 MHz). My 23cm portable antenna collection includes: 12el DL6WU Yagi 12dB gain – lightweight boom construction using a folded dipole; 6el DL6WU Yagi 9 dB gain – ruggedised all brass construction gamma matched, ideal for the Australian scrub bash; and 2el HB9CV […]. Off-Center-Fed (OCF) Dipole Antenna for the National Weather Service. The Windom antenna is an Omni-directional, off-centre-fed, wire type antenna, that when installed at 35 to 55 feet above ground will exhibit a feed point Impedance near slightly more). Beyond 1,500 miles, the Windom takes over. Add to cart. Overview: An OCF dipole was designed for the National Weather Service so as to be resonant on even harmonics of 80 meters (80-40-20). A typical OCF dipole is fed at 1/3rd of its length. To achieve this the Windom uses a 4:1 voltage balun, which matches the antenna's leg voltages and then uses a separate 1:1 choke balun to isolate the feed line from the vertical radiator. Googling around, I found a commercial design for $75 and a homebrew design that I could make for a lot less. I briefly considered patenting my design. It's a dipole, fed 14% off center with a 4:1 balun. SSB TRANSCEIVER 40 M BAND.