Carolina windom vs ocf dipole Like all other dipoles I have used on 160m, I found the Carolina Windom to be poor performers for 'my' 160m requirements. This is similar to the operation of the Carolina Windom TM, however, the MMANA_GAL model shows that on 15m, the antenna performs like a normal dipole with no feeder radiation when the 1:1 Balun in switched in. Verticals have omni low angle. The Off Center Fed Dipole – how they work. Off-Centre-Fed Dipole OCF’s are a descendant of the Windom. 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 The off center fed CAROLINA WINDOM provides outstanding performance on all bands This includes all Hits: 6623 | Votes: 3 | Rating: 4. 5′. The OCF dipole is constructed using top quality, Poly-STEALTH 13 Breaking strength 370 lbs. I have CAROLINA WINDOM® and CAROLINA WINDOM® Compact™ are Trademarks owned by the RADIO WORKS™ Page 4/4 Type CAROLINA WINDOM® Compact™ 80 Installation Check List Caution KEEP ANTENNAS AWAY FROM ELECTRIC UTILITIES. The Carolina windom antenna is a vastly improved and much more effective antenna than the old windom of the 1930's. Version 2 of my 40m Ultra-Light OCF dipole has been working for almost one year now. 5KW - Loop, OCF, Folded Dipole useful to 200 MHz 1. Even if it were cut for 80m the sacrifice would only be 4. I have one that is 283 feet long and covers 160 meters all the way up to 6 meters. So you have an OCF radiating as well as a vertical. usually 5 or 10 dB ahead of the dipole. I have taken down and moved the windom a few times so when I started putting up the buckmaster the first very obvious thing was how nice the heavy coated wire was to work with. Just MAX™ and provides the best compromise between purchase a CAROLINA WINDOM® and you have the maintaining a low SWR and low loss on each band while I’ve done all I can to lengthen the OCF’s legs to shift the resonance lower, but it’s still not ‘right’. Rancangan yang lantas dikenal sebagai Antenna Windom ini berupa sebuah Dipole 1/2 λ yang diumpan lewat single wi re feedline pada feed point yang dianggap berimpedansi Antenna Windom Links → . The CB-4-1500ODCV is a CUBE™ enclosure containing a dual core, bifilar wound, voltage balun to force equal voltages on the unequal sides of the off center fed antenna and force current down to the vertical radiator so it acts like a vertical antenna adding to the radiation The Carolina Windom - still up - is more quiet, but the Buckmaster hears better most nights. " - N9VV (at eham. The Carolina Windom is a variation of the Windom (which used a single wire feed) designed by Edgar Lambert, Joe Wright and, I think, Jim Wilkey in the mid 80s. The New Carolina Windom uses a horizontal, OCF element and with balun / choke spacing, will radiate on the vertical feed line space between, the balun and choke. A center-fed half-wavelength wire antenna cut for 7. 3) Shakespeare 393 Marine HF SSB Vertical: 3: 2017-04-07: 395. Find out how it works, how to feed it, considering using an Off Center Fed Dipole or a G5RV or a Carolina Windom. 5 on 40 meters but is pretty This is about the OCFD and not a Windom, Carolina Windom, or End-Fed Zepp. It's a dipole fed off center with a 4:1 current balun at the offset feedpoint. 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 OCF Dipole Antenna Windom HF . A commercial antenna system, the Buckmaster 7-band OCF Dipole, exploits this property. Hears well Review Summary For : Buckmaster 7 Band, 300W, OCF Dipole Antenna; Reviews: 33 MSRP: 192. Contrary to popular belief, the best transformer balun to use is a 4:1 Ruthroff (voltage) balun wound on a single #61 ferrite Toroid. to a 132ft OCF dipole on 20m - one of the bands where it has most effect. Several companies sell a multiband dipole. Just MAX™ and provides the best compromise between purchase a CAROLINA WINDOM® and you have the maintaining a low SWR and low loss on each band while The OCF-8010-3K Windom is proving to be an excellent replacement for my lightning-destroyed RadioWorks Carolina Windom (now out-of-business). NONESENSE! The classical feedpoint of the windom will give you the best SWR curves for a few of the bands, but if you are willing to accept a slightly higher SWR, it is possible to cover additional bands. 1 and 3. After many requests we have created a compact, special balun for OCF antennas with vertical radiators. Ideally, the switched ratio balun should be connected to the end of the transmission line in an accessible and Testimonial. 00 Quick View ZS6BKW / G5RV Optimized Multi Band HF Dipole Antenna Poly-Stealth Ni4L. Rancangan yang lantas dikenal sebagai Antenna Windom ini berupa sebuah Dipole 1/2 λ yang diumpan lewat single wi re feedline pada feed point yang dianggap berimpedansi The antenna you describe sounds more like a traditional OCF dipole. There is no comparison! Better build quality, better wire, better balun and better results too!-----Earlier 5-star review posted by W2FBS on 2009-10-04 I put the 7 band The 40m OCF Dipole, also called FD-3, is one of the most popular multi-band antennas in Germany. " THIS IS WRONG! THIS ANTENNA CAN WORK ON 15m! Review Summary For : Buckmaster 7 Band, 300W, OCF Dipole Antenna; Reviews: 33 MSRP: 192. On40 meters. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. The document describes the development and design of the New Carolina Windom antenna. 2. V or L,so it looks like a Z. Antenna: MFJ-1216 – 160/80 meter OCFD wire antenna with matching network. 00 (5) Radiowazv G5RV-E: 9: 2019-08-14: 35. A dipole in free-space (sufficiently away from other objects, including the Earth, such that no object has a measurable effect on it) have an impedance at the feed-point of about 72 Ohms. Kirvin Hodges, KF0SI. On 30 meters and up. I've used it with a Palstar AT2K, an LDG Z11PRO automatic tuner and a LDG AT-200PRO. The Carolina Windom is essentially an off-center fed dipole (OCFD) that uses a portion of its feed line as a vertical radiator. I like this fine OCF antenna because it performs as advertised. Tuner Shootouts. The Off-Center-Fed Dipole is a Dipole whose feedpoint is at a point removed from the center of the antenna. 5KW - Loop, OCF, Folded Dipole useful to 200 MHz. 800+ on 80M), 80, 40, 20, 17, 12, 10, & 6 meters. 95 (4. Hears well The Carolina Windom is described in (Straw 2007) who attributes it to Edgar Lambert (WA4LVB), Joe Wright (W4UEB), and Jim Wilkie(WY4R) who published a variation on the ‘original’ Windom. Le dipôle asymétrique (OCF) Un choix avantageux. Consistently, whether OX or local, the Windom wins over the inverted vee by about an S-unit. OLD Antenna; Super OCFD BALUN; OCFD eBook. good 4:1 voltage balun at dipole feed point; current balun |Zcm|=3000Ω, Q=1 (in line with the fashion for ‘resistive’ baluns); Find many great new & used options and get the best deals for RadioWavz DX80 Off Center Fed (OCF) Windom Dipole Antenna for 80, 40, 20, 10M at the best online prices at eBay! Free shipping for many products! It's a little noisier than my Carolina Windom but still it works well. 11 votes, 40 comments. It's position is influenced slightly by things like height of the feedpoint and heights of the two ends, angle of the legs (in case of Inverted-V) and type of An ultra-lightweight 4-Band wire dipole - weighs less than one pound, including 40' of coax. 95 (4) RadioWorks Carolina Windom 160: 4: 2011-02-20: 160. Installed: Mid November 2013 I operate mainly on the digital modes running less than 50 Watts. than 1. 7) INTERCEPTER 10K 5/8 OMNI: 3: 2011-03-15: K8MSH 7-Band 300w PEP OCF Dipole Antenna Radiowavz 75M Double Bazooka PAR ENDFEDZ 40-10-KW EFHW 1KW ICAS ANTENNA Wellgood Loop Amplifier Par Electronics Google “New Carolina Windom” antennas. The antenna pretty much met the goal of having a 4-band simple coax-fed dipole that does not require an antenna matchbox. works well with my IC-756PRO ATU on 40m, 15m, & 12m. In theory there must be radiation from the top segment of the coax, but in my experience, it was not enough to make a At the end of the day it simply a good dipole. 6) Radiowavz Windom 160: 6: 2014-01-11: K8MSH 7-Band 300w PEP OCF Dipole Antenna Radiowavz 75M Double Bazooka PAR ENDFEDZ 40-10-KW EFHW 1KW ICAS ANTENNA Radio Works Carolina Windom 80: 91: 2024-02-17: 89. overall rating; 0: 0: 3: 4. One is called The Carolina Windom and another is called the Buckmaster OCF Dipole. The objective being to find an impedance on the antenna that can provide a reasonably good match to the transmitter across multiple I second this; 66 feet of OCF dipole over the 60 foot back fence hung as an inverted-V will be a pretty good antenna on at least three bands without a tuner. Then, ha I am very pleased with it compared to several previous Radio Works Carolina Windom ANTs. I'm using it to demonstrate the resonance of the Windom on What is the best way to hang an off-center-fed dipole or windom antenna as an inverted-V? Should you hang the feedpoint at the apex, My own 40m New Carolina Windom, with the longest leg at 74 o from vertical, sacrifices only 2. After much research on attic antennas for mainly 40/10 meters we've narrowed down options to a 40/20/10m fan dipole or the the 5/8 and 3/8 point (OCF) instead of the 2/3 and 1/3 (NCW). Taking one vertical angle and frequency with another, the RadioWavz DX (OCF) Windom is Omni directional. The OCF dipole differs from the Carolina Windom for the same reasons it differs from a G5RV. there is a slight edge with the Windom. An improvement on the Windom is the Off-Centre-Fed Dipole or just OCF. I used one to make about a 100 PSK31 contacts on 20, 40, and 80 Example of using 4NEC2 to read the 20m Carolina Windom EZNEC format file from the ARRL 22nd Edition Antenna Book compilation of . high height (35 feet or more). 95. For a conventional antenna I would normally split this wire in half and place a feed point in the center. 333 feet long. It is fed off-center, typically at the 1/3 point, instead of at the center like a traditional dipole antenna. SKU CB-4-1500EBV. Feeding the OCF dipole at a point that is one-third of its perhaps something more akin to the the so called “Carolina Windom,” or G5RV, both of I was starting to think that this antenna is acting like a Carolina Windom - and I was going to ask how to determine if there are common mode current on the coax (thanks for the tip on the MFJ) . It does this specifically to add the 10m band to an antenna that would otherwise not work well on this band. And OCF are reportedly a little less prone to RFI. OCF80 (Offset Fed 80 – Carolina Windom). The disadvantages of feeding the OCF dipole at the classical 1/3 - 2/3 split with openwire are, first as presented earlier, Common Mode Current (CMC) on the feedline, and second, extremely high impedance on 15m. With the cost of supplies to build antennas today, you can not go wrong buying a RadioWavz antenna. Additionally, the so called. You can learn all this from the Radio The Carolina Windom is the first off-center fed dipole antenna. The original Carolina Windom was 131 feet 10 inches in length and resonates at 3550 Mhz at a height of 35 feet. They are broad Thanks to the installation of the Ameritron RCS-4 remote antenna switcher, it’s become much easier to compare my two HF antenna installations. Matching RadioWavz Carolina Windom: 6: 2019-02-17: $75 (3) Diamond W-8040 traped dipole: 1: 2006-02-28?? (3) VB 800 Vertical antenna: 1: K8MSH 7-Band 300w PEP OCF Dipole Antenna Radiowavz 75M Double Bazooka PAR ENDFEDZ 40-10-KW EFHW 1KW ICAS ANTENNA Wellgood Loop Amplifier Par Electronics HF-Rectangles Here's the scoop on Ver. I have tional Carolina Windom since it was the first attempt at creating this specific type of multi-band antenna based loosely on Windom’s original concept. Quiet on all bands, flat across from 80-10, with a bump to 1:2. Edgar was a friend, as well. It is a good antenna for the money, Verified purchase: Yes First of all this replaces a Carolina windom 80 that was bare wire. Hi Bob, Radio: Flex-6700 running barefoot -10 to 100 Watts max. The Windom (also called "OCF", Off Center Fed) antenna is one of the most popular wire antennas for radio amateurs. dipole fed with "450" ohm ladder-line, a feedline of: 88 ft. OCF Dipole - 90ft on the long side, 45ft on the short side with a 4:1 CURRENT balun at the feed point, coax to the shack. hmmm - so it's a Carolina Windom 40 billed as an OCF Dipole with a vertical element. Windom ladder line feed dipole OCF. Addendum (9-18-2015): The Attic 40m Doublet actually outperforms my 40m Carolina Windom to the West (both receive and transmit) It's about 12db down on 8 Band 160-6 270 feet 180/90 each side. The modern common Windom antenna is not an original single-wire fed Windom, but rather an off-center-fed or "OCF" two wire feed dipole. The problem with all 160m horizontal dipoles is, they are poor DX Comparison of Carolina Windom and 186 Foot Ladder Line Antenna Tri-County Amateur Radio Club of North Texas WC5C had the opprutnity to compare a homebrew OCF dipole with 4:1 balun fed by RG213 with a G5RV fed with about 40ft 450 ohm ladder line set up very similarly to each other, and we've operated with them both about 3 times now when 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. Although I am a fan of the OCFD antenna when seeking a single multi-band antenna, I have never built a 160m OCFD antenna, though I have used a Carolina Windom on that band. All of the sudden after a few days operating with this antenna, I start to have RFI center fed atau OCF antenna. WHAT’S WRONG WITH THE O ff-C enter-F ed-D ipole?. The New Carolina Windom antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. No kinks here my friends! I do not have this ofc installed exactly as the instructions suggest. It covers 6 bands, 10-12-15-17-20-40m. Mine was burnt and broken from the lightning hit. Using #43 ferrite for this purpose, especially when running digi-modes, often leads to SWR-creep (slowly rising SWR level) due to its low Curie I want to build an off-center fed dipole for 80 meters and up. 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 Review Summary For : NI4L CUSTOM RESONANT DIPOLE; Reviews: 18 MSRP: 35. It was designed to cover 80, 40, 20 15, and 10 meters. So I need a better HF antenna. Quebec337 Since you are wanting to receive only and not transmit on this OCF (off-center fed) dipole antenna The Windom has a storied history Gory details here by Robert Brown, M0RZF with Contributions by Rick Westerman, DJ0IP The actual birth came when Howard M. 33 . Feed the OCF with a 4:1 Current Balun made using two cores. Pourquoi considérer un dipôle asymétrique, demi-longueur d'onde (en anglais off-center-fed dipole ou OCF) au lieu d'une antenne dipôle, alimentée en son centre, pour la même demi-longueur I use an amplifier and normally put out about 1 KW and no problems with the balun like I had with the Carolina Windom. If you use it for a Continue reading → The picture above on the left shows the classical Dipole, which is usually fed with 50 Ohm coax, through a 1:1 balun. This is the same design as the The modern common Windom antenna is not an original single-wire fed Windom, but rather an off-center-fed or "OCF" two wire feed dipole. So I'm no longer using this attic antenna for 80m but it's working great for 40m and above. 98 Quick View Inverted L 160/6 meter band HF Antenna SWL 3KW Dipole Marconi It is quite possible to modify the Windom to give us a decent SWR on some of these new bands. RESULTS. Buckmaster 4-Band OCF This video shows the difference in gain between my OCF dipole at 52 feet and my 160 meter dipole at 45 feet. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. Carolina Windom employs both a 4:1 balun where the matching stub meets the horizontal elements, and also a 1:1 current. It's also ideal for those Coax fed OCF ‘Windom’ antenna. It's moot right now as I found the attic space is about 6 feet to short - I could dangle the ends but I don't think that's the right solution. So that kit is likely just a common mode choke, but might have some higher order Z transformation, too. The windom antenna can also be hung as a Homepage van Maarten Ouwehand PG1N. The antenna works on the 10 to 80 m bands with a One final OCF dipole, Figure 5, this time for the 6, 10, 20, and 40 meter bands, is by Rick Littlefield, K1BQT, and 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. This version replaces the single core balun of Ver. This replaced a Carolina Windom that failed after 2 years. Power handel:1kw PeP. It is an off centre fed dipole, with 10 feet of vertical radiator. Reply reply More replies More replies. History: From Windom Antenna to Multiband OCFD. Thread starter BAGEBOY; Start date Oct 7, 2021; B. It had 15 turns around a 3/8 ferrite rod. Radio Works Carolina Windom Compact 40: 3: 2015-11-19: 140 (4. Such is the nature of any OCF dipole. The New Carolina Windom Len Carlson - K4IWL . I have actually used it in another antenna (Ver. It is better than any single-band or multi-band dipole. This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. OCF Double - Dip. Found the upper one was a 4:1 to 1 balun. Read about Windom, Carolina Windom, or Off-Center Fed Dipole and how they work. 5KW - Carolina Windom, OCF, Loop Antennas. A common-mode choke at the feed point is needed to keep the feedline from radiating. I emailed Chris to ask him if he thought After many requests we have created a compact, special balun for OCF antennas with vertical radiators. It evolved from Loren Windom's original 1929 design for an off-center fed dipole antenna. 18λ from one end providing a 500 ohms match. However this gets trickier at lower installation heights. CHANGE: I have re-designed the feed method. The radiation pattern becomes progessively more complex with wavelength. Here is my home HF antenna. of my Ultra-Light 40m OCFD. Why? Because the two wires either side of the feed point are of unequal length. 3/66. 95 ft. 1) Radio Works Carolina Beam 80 Special: 7: 2012-06-09: 125 (4. Something may be wrong but my best SWR of 4 on 80 meters won't cut it even with the tuner. 15 MHz (about 67. >I am installing a Carolina Windom Short 80 and am not sure which way to >orient it. At lower installations Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. net) Buckmaster 8-Band OCF Dipole Antennas are 270 feet (82 meters) long and work on 160 (tuner may be required for amplifier on 160 and 3. The antenna works on the 10 to 80 m bands with a One final OCF dipole, Figure 5, this time for the 6, 10, 20, and 40 meter bands, is by Rick Littlefield, K1BQT, and Excellent Multi-Band Dipole Time Owned: more than 12 months. My supports (a sycamore and cherry tree) were about 230’ apart, so if I wanted a full-size antenna, I needed something that I could slope at the ends. As with all ham stations QRO or QRP, ten percent of a station’s success in quality QSOs is the equipment and the operator. Really, as long as the impedance is near 300-600 Ohms of the feed line, it should not make much difference. Buckmaster 4-Band OCF Dipole. Conclusion Although it works like any other dipole, [in my opinion] the Carolina Windom is a waste of money DIY CAROLINA WINDOM I have wanted to build a multi-band wire antenna for some time now and this past Field Day I had an opportunity to use a very good one. The radials didn't seem to help. Excel Worksheet for Building Any 1/2 Wave Dipole (Center-Fed, OCF, Windom, New Carolina Windom) But that leaves all the weight of your balun, coax, and (in the case of a New Carolina Windom) RF choke unsupported by anything but the antenna-wire itself. Product is in production: More Info: # last 180 days Avg. Product is in production Using our field day equipment we set up four wire antennas to find out for ourselves how they play. (This is the Carolina Windom design). 2 with a dual core balun. Beyond 1,500 miles, the Windom takes over. Nonetheless, the 80 M dipole - fed off-centre - will definitely be suitable for use on 60 M. the feeder. Version 4 has the same feedpoint split and leg lengths as used in version 3. However, one of the supposed advantages of EFHWs is "it works Excellent Customer Service with Hurricane Caused Order Difficulties Shortly after Hurricane Helene caused structural damage, flooding, and power outages in North Carolina, I ordered my preferred NVIS antenna (OCF 8 Bands 160-6 HF Windom Antenna Flex-Weave) from Chris at Ni4L in preparation for an upcoming Oregon Emergency Management AuxComm Exercise Here is a spreadsheet I designed in Microsoft Excel for calculating the first cut and the final cut (after testing) of a 1/2 wave dipole, whether center-fed, classic off-center-fed, Windom, or New Carolina Windom. I bought the 7 band 3K OCF Dipole to give me the bands my KIO Hex Beam did not handle. 45 m) long. NOTE: Recalling from memory 7 years later: Update 30-03-2016: Since I wrote this article I updated my outside Windom to an 80m OCF Dipole. Rating last 180 days Total reviews Avg. 3' long) has a maximum gain of about 7. One concern with making a multiband OCF dipole is achieving reasonable impedance on all amateur bands. , M&P Airborne-5 or Airborne-7), then raising it higher into the air than you can get the heavy Carolina Windom. The tuner in the images below is in BYPASS mode. "By design it has a good SWR only on 40/20/10m. Absolutely the best dipole I have owned or tried. The CB-4-1500ODCV is a CUBE™ enclosure containing a dual core, bifilar wound, voltage balun to force equal voltages on the unequal sides of the off center fed antenna and force current down to the vertical radiator so it acts like a vertical antenna adding to the radiation . In other words an 80-meter Windom 137 feet long would have one leg 45. 1. The RadioWavz DX (OCF) Windom is ideal for those of you who do Friend has OCF dipole and he also needed about 50m of coax from antenna transformer to a 1:1 choke, a lot of ground wiring to all directions from that to give the RF alternate path and then it stopped dumping RF into the shack and works good. This is sometimes seen and is 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. Elevation: Over 60 feet AGL – fully extended. tuning is way off there. Generally they are fed as an OCFD with a 4:1 transformer at that off center location. 6:1 In other words, the 80 M dipole is *physically* too short to fully accommodate two complete half-waves at 5. I replaced your basic G5RV antenna with Array Show all keyboard shortcuts. It competes in popularity with the "Half Size G5RV" from England. 95 Add to basket Vine Antennas AS-CW-80-HP | High Power Carolina Windom | LAMCO Barnsley Vine Antennas AS-CW-40 | HF Antenna Carolina Windom | LAMCO Barnsley The OCF dipole antennas from Alpha use a modified UnUn to match impedance. 2. The 160 meter dipole is fed with 450 Ohm “windo OCF Windom Dipole Antenna Poly-Stealth Ni4L. Kinda specific to making an OCF into a Carolina. Most people believe the 40m OCF cannot work 15m. The Carolina Windom 40 has been at my qth since May, 2009. It will operate on 80, 30, and 17 meters but will require a tuner for these bands and 17 meters but will require a tuner for these bands: The Windom Antenna Off Center Feed It consists of a half-wave dipole at its lowest frequency band, with a single-wire feeder connected off-center Loren Windom began with the basic concept but soon made changes. I recently upgraded to a General license, and am looking to add an HF antenna to my QTH. the Windom is all I have at the presenttime. Creation date : 11/08/2007 @ 00:50 Last update : 15/09/2024 @ 14:40 Category : Multiband HF Projects Page read 20822 times Vine Antennas AS-HF-OCF-80-HP | High Power Off Centre Fed Dipole | LAMCO Barnsley £ 159. It is not commonly referenced. It performs great and should last for years. operation versus a 135' dipole fed with ladder line (a la ARRL You will have far better DX results by building your OCFD as lightweight as possible, feeding it with lightweight coax (i. The New Carolina Windom is, a Half Wave length Why not put up an Off-Center Fed Dipole or Carolina Windom and be ready for more than just 20M and not require a tuner for most bands? OCF Dipole - Whoa! Holy Cow! - Ham Radio FWIW - I use my Buxcomm Windom OCF with a tuner mainly to ensure I can use the 30, 17, and 12M bands where the OCF SWR is a bit high. 3 MHz. 99; After researching antenna options, I selected NI4L’s 8 band OCF Windom. Like others have stated Do Not use twin lead/open wire This antenna is based on the latest design enhancements of the Carolina Windom which is rapidly becoming the workhorse wire antenna of DXpeditions around the world and for good reason. Conclusion Although it works like any other dipole, [in my opinion] the Carolina Windom is a waste of money as a dipole but at ~ 33% distance along a horizontal wire. Is the 22' length of the coax of the Windom critical or is that just a minimum length? Also, if the coax is burried right below the balun at ground Review Summary For : Palomar Engineering 80M OCF Antenna; Reviews: 3 MSRP: $169; Description: 80 meter Off Center Fed Dipole 133' long with high power 4:1 Current Balun and 1:1 RF Choke at the feedpoint. One must remember that the antenna is fundamentally a dipole antenna that has multiband capabilities. This history section has turned out quite lengthy, to the point that it has become almost an article within an article. 7), the sweet spot we are trying to find (exact position of the new feedpoint) is often very narrow. This chart also explains why I’ve struggled with 80m as of late. Anyone have any ideas on the comparison between a 132' long Carolina Windom designed for 80-10mtrs. 136 feet (45. These are basically similar but vary in small details. A standard horizontal dipole is fed at a position other than the centre. I've used this configuration with a single 25' mast many times. It will get down to 1. Definitely better than any quarter wavelength vertical, no matter how good its radial network. Strange QRM detected by new FTDX10 radio. My only advantage is that now, because the two are perpendicular, when conditions render signals weak on the Windom, they are readable on the Buckmaster. Learn about the OCF antenna, also known as the Windom or Carolina Windom, a multi-band dipole that covers 80-10 meters. 1) Radio Works Carolina Windom 160: 25: 2014-02-07: 135 K8MSH 7-Band 300w PEP OCF Dipole Antenna Radiowavz 75M Double Bazooka PAR ENDFEDZ 40-10-KW EFHW 1KW ICAS ANTENNA Wellgood Loop Amplifier Par Electronics New Carolina Windom shown cut for 40, 20, 15 and 10 meters. So from a mechanical standpoint the best way is to hang the feedpoint at the apex, with 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 (HAM) bands. works well with my IC-756PRO ATU on 30m, 17m, & 10m. ___ 24. True Original Windom - single wire feed OC to an elevated horizontal wire. Superior to the Windom. > >The company which sells the antenna says that because the antenna has a >vertical section which radiates; the antenna is omni-directional. A popular antenna is a Carolina Windom which is fed off-center so much that it requires a 9:1 FAQ: Off-Center Fed Dipole vs Standard Center Fed Dipole What is an Off-Center Fed Dipole? An Off-Center Fed Dipole (OCFD) is a type of antenna used in radio communication that has one end of the dipole longer than the other. BELOW you can read about the steps that wasted my time and money. BAGEBOY Active Member. e. $149. The Carolina Windom 80 works extremely well on 80 and 40 meters. 667 feet long, and the other leg 91. He reasoned that a basic half-wave dipole exhibits an impedance of approximately 72 ohms at its center, rising to several thousand ohms at each end, and consequently there must be points outward from the center that should exhibit 300 ohms, 450 ohms and 600 ohms. The wire is 65 strand, 12 Ga. In the Carolina Windom, the current in each of the wire radiator sections is out of balance. Joe was my neighbor and one of the VEs when I took and passed my General. Performs as well as my home-brew ocf dipole at 100FT. Q. A feed line is attached to an optimum point along the dipole by a BALUN. I did not add an isolator-choke to the feedline. Williams, W9BXQ, was first to feed a half wavelength horizontal wire off centre with a single feed-line. This is made by winding two ferrite cores with 100 ohm, 1:1 windings. It was a 40 meter Carolina windom. A BALUN after the ladder line will match it to the coax. the rule. 6 MHz and you arrive at an overall length of 130′. 7 The Carolina Windom Antenna - the 160m-10m Special version by Radio Works. GV5V vs. Anyway, after calculating the dimensions, I put up this OCF dipole using insulated #14 wire I got from the Wireman at the Orlando Hamcation. 5:1 on most frequencies. Specifically, we must accept a slightly worse SWR on some of the old bands in order to obtain use of some of the newer bands. $124. (Unlike a centre-fed dipole) Coaxial cable (which is not a balanced Fritzel FD4 OCF Dipole Fritzel FD4 OCF Dipole The Frizel FD4 Windom is an OCF (Off Centre Fed) antenna that has been around for a long time. My first HF antenna was a home brewed OCFD, and I worked WAC, WAS, and about a hundred DXCC entities in one year. The Off-Center-Fed-Dipole – also called a “Windom” by many companies selling them – has a somewhat blemished reputation amongst amateur radio operators. Thank You for this high quality product at a great price. An OCF dipole produces a radiation pattern very similar to that of a center-fed dipole on its fundamental frequency, and a very nice pattern with lots of gain on its second harmonic frequency. Could not set up as an inv. PVC coated wire, with EVERY copper strand tinned to prevent corrosion. $0. Here is why and how it works. The New Carolina Windom HF antenna uses a horizontal, OCF element and with balun / choke spacing, will radiate on the vertical feed line space between, the balun and choke. The New Carolina Windom is, a Half Wave length antenna at it's The Carolina Windoms work just like a dipole or normal OCF-dipole. The greatest drawback for me would be supporting all that weight hanging from the feed point. Although thousands of “hams” use and love these multi-band antennas, especially here in Europe, it seems just as many people, including several well-known antenna RadioWavz DX80 Off Center Fed (OCF) Windom Dipole Antenna for 80, 40, 20, 10M. 2) and you can see pictures of it under Ver. 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. 00 Quick View OCF Windom Dual core Current balun 3KW Poly-Stealth Ni4L. 6 dBi at 70' up, with an Overall lenght is 256ft the GB Windom for 160-10m it is a OCF dipole,is constructed with 3mm PVC coated steel wire and a 1:6 Balun, it consists of a Flat top and are coax feed. Any thoughts or experiences with these antennas as compared to a half-wave dipole?-- Windom and Carolina Windom Antennas. NEW vs. The key to obtaining more bands from any Windom (or OCF) is the positioning of the feedpoint. This is not a dipole. 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. Lessons Learned; Balanced-Line-KD7MW. I will be using an LDG AT100Pro II automatic tuner. 5: I have successfully built a new super lightweight balun using two Toroids. 1929: After involvement of many people, Byrne wrote an earlier thesis paper on it, but Windom got the credit in the Sept. The big advantage of this design is that you can make an antenna that does not require an antenna tuner by utilizing the For my 130 ft. A conventional center fed dipole has the lowest feed point impedance at the center, 50-75 ohms depending on height An IMPROVED Version of Ver. The Off Center Fed dipole (OCF) is made up of two different lengths of antenna wire (dipole legs) for operation on multiple bands. 00; Description: A well-constructed 7 band off-center fed dipole, designed for 75/80, 40, 20, 17, 12, 10 and 6 meters. 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. FTDX-10 – setting up WSJT-X The Carolina Windom is the first off-center fed dipole antenna. Screw the remaining PL-259 on the lower end of the Vertical Radiator coaxial cable into one of the SO- Radioworks Carolina Windom 160 Special: 3: 2013-07-13: 124. 0 on 20M. As a result, Alpha’s systems have stark similarities to OCF Dipoles that use a 4:1 Balun. The CB-4-1500ODCV is a CUBE™ enclosure containing a dual core, bifilar wound, voltage balun to force equal voltages on the unequal sides of the off center fed antenna and force current down to the vertical radiator so it acts like a vertical antenna adding to the radiation New Carolina Windom. 00 (4. I do need to make a correction in calling the EFHW a non Home Made Off Center Fed Dipole. I suggest you search on "build a new carolina windom" (or ocf) and read all the good stuff others have done. Insulators:2 center fed atau OCF antenna. The SWR sweep of the following 6 to 80-meter OCF Dipole antenna systems using Alpha’s Auto Match. Now, how was a Windom antenna developed? It began with a center-fed, half-wave dipole. The bazooka worked well but was a single band antenna and I would replace it after any 160M contest with either a Carolina Windom or a 80M delta loop. I'm going to the Hamfest at Piscataway tomorrow looking for an attic solution like a loop antenna or a cobweb. Winwom antenna The windom antenna is an off center fed dipole,resonating from 10 to 80 m: Windom Antenna The Windom antenna and shows the results of several simulations made with MMANA-GAL, covering models optimized for the 20 m, 40 m and 80 m bands: Windom per gli 80 m 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. Most people still believe a Windom MUST be fed at the 1/3 - 2/3 point. Unlike typical antennas, this is a non-resonant, Off Center Fed Dipole (OCFD) antenna. The New Carolina Windom uses a 4:1 balun built The RadioWavz DX (OCF) Windom is an off center fed (OCF) dipole antenna that exhibits outstanding performance on multiple bands typically with out a tuner. The asymmetrical arrangement of the dipole results in very favourable installation possibilities in some situations. It needs no tuner on 40m, 20m and 10m. HOWEVER, we do this at the expense of the original 4 bands. 50:200 ohm (4:1) Dual Core Current Balun Kit, 1-55 An OCF at its fundamental frequency performs similarly to a center-fed dipole of the same length. (Note: if you are doing this on purpose, don't forget to use the feedline's velocity factor The Carolina Windoms work just like a dipole or normal OCF-dipole. Yes, the OCF is pricey, but well worth the money. Charles Tom Rauch Rick Westerman The common mode is caused by the impedance and voltages at the feed more so than the asymmetry. Figure 2 is the electrical equivalent of the Tradi-tional Carolina Windom. Oct 7, 2021 #1 What is the correct or mostly used measurement for build a multiband I’ve resisted producing an OCF Dipole for many years this matching unit have been optimized for the OCFD because there was really no reason to make them. That is: 468 / Frequency Mhz will give you the overall length of the antenna. I am very pleased with it compared to several previous Radio Works Carolina Windom ANTs. How About a 160-Meter Off-Center The Radiowavz DX (OCF) Windom is a off center fed dipole antenna that exhibits outstanding performance on multiple bands typically without a tuner. For an 80-10 meter OCF dipole antenna, divide the 1⁄2 wavelength standard of 468 by the lowest operating frequency of 3. BACKGROUND FROM WINDOM TO OCFD 1927 – September; Loren Windom, W8GZ/W8ZG, was the first to reveal the Windom antenna to the radio amateur community by describing the antenna in the September issue of QST. Red trace is the azimuth response at 10 I have many antennas to compare to, Mosely TA53M Beam, Hygain TH11DX Beam, 80 M dipole, Carolina Windom 160, a 300 foot horizontal loop, and now the OCF Dipole from Array Solutions. It does require an antenna tuner. The center is at about 70' fed with coax and a 4:1 You'll get a much greater frequency coverage span by doing that. Made with stranded 14 awg UV insulated wire. The OCF-8010-3K Windom is proving to be an excellent replacement for my lightning-destroyed RadioWorks Carolina Windom (now out-of-business). Long:78m (256ft) Balun:1:6. This manual will show four versions of the Off Center Fed dipole that can be made from this kit. Oct 28, 2014 117 14 28 46. This antenna is ideal for those who do not use a tower and beam. Started by taking the 2 baluns apart to see what they were made of. It is harder to settle down a 200 ohm feedpoint than a 50 ohms feed point because the The Carolina Windom - still up - is more quiet, but the Buckmaster hears better most nights. THE WINDOM IS A COMPROMISE: The windom is a compromise antenna. That would seem like a challenge for a 105 foot long horizontal antenna. With a flick of the rotator, it’s easy determine which antenna is the ‘loudest’ The modern common Windom antenna is not an original single-wire fed Windom, but rather an off-center-fed or "OCF" two wire feed dipole. I’ve resisted producing an OCF Dipole for many years this matching unit have been optimized for the OCFD because there was really no reason to make them. General I'm looking for some antenna advice. Product is in production Off-Center-Fed Dipole, OCFD, Windom Balun Designs 411 4 ocf). Ive had a Radio Works Carolina Windom 160 for 10 years, on 80 meters I hear stations that my nearby 80 dipole doesnt hear on 160 it parallels on receive with a 160 dipole it came down in the big 2013 Ice storm but was easily fixed. Verified purchase: Yes | Condition: New A six-band, HF Windom antenna April, 1997 This Windom antenna was marketed in the late 70's and early 80's as Smithe's Windom. . Ninety percent is the antenna. 3′ at the center of the antenna. SAME: I Windom antenna/ocf dipole. COVER; FORWARD; Chapter 1: The Search for a Multi-Band Antenna; Chapter 2: A Brief History of Windom and OCFD Antennas; RESOURCE DOCUMENTS; Alternatives to OCFD; Ant. Navigate to a group After many requests we have created a compact, special balun for OCF antennas with vertical radiators. New: I have built a 4:1 Guanella on two "-43" Toroids, placing one transformer on each core. 67 Windom Antenna; A Carolina Windom purposely uses part of the feed line as a radiator. EZ file examples. The performance characteristics are quite outstanding. Buy Now. It's a 30ish foot piece of wire in a fiberglass tube. By serendipity, it also covers the 17 and 2 meter bands. It's Horses for Courses again! AND remember, when we start moving the feedpoint away from the clasical position (33. 8-61 MHz, 1. ARRL Tuner Test. The antenna was a half-wave in length using a single wire feeder of any length attached 0. It is noisy than a loop I had. 50:200 (4:1) CUBE™ Current Balun, 1. 90% of the reports are 5-9. The differences between this antenna and Windom’s is that the Original Windom is not a dipole. Off-Center Fed Dipole Design The Windom (or OCF Dipole if you prefer), offers a true multi-band, experience without much use of a tuner. ctrl + g :. There is no trlbander Off-center fed (Windom) vs end-fed (EFHW) for an "Inverted L" multiband 40-10 wire antenna . Windom antennas are basically Off-Center-Fed Dipole (OCFD) unlike the half-wave dipole which is center fed. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. The downside of feeding the dipole in the center is that you have extremely high impedance (SWR) on the even harmonic bands. The reason is the larger bandwidth compared to blocking circuit dipoles. Besides, a vertical for 40, 80 and 160 means the use of traps to keep the size down to something manageable. Worked Europe, Asia, South Africa, West Coast, Canada, South America mostly on 17M and 20M. Carolina Windom - ~81ft on the long side, ~50ft on the short side with a 4:1 VOLTAGE balun, 22-25ft of coax then a 1:1 choke balun. This trick works for another off-center fed (OCF) antennas. 2-2. Wire:3mm with pvc coated. This improves the balance by forcing equal currents into each side of the antenna (which a single The Carolina Windom (OCF dipole) places a balun at the feedpoint and another inline balun at 1/4wl down the coax assuming a wavelength of 10m. WINDOM Antenna Di majalah QST edisi September 1929 Loren G Windom, W8GZ memperkenalkan rancan gan off center fed antenna yang dikembangkannya. Depending on propagation the antenna is always equal to and most times outperforms the other wire antennas. My Eagle1 vertical isn't cutting it. kfrdjq wvx myv kwcxa zzjrs whqoxd ujppk fjitrn oforcz abccx