Balun for carolina windom antenna 5-30MHz with 1500W power handling capacity. 1 The page describes a Windom antenna with a 4:1 homebrew transformer. The article provides detailed instructions on constructing the antenna and balun, along The Carolina Windom, as the name implies, is a variation of the single wire-fed Windom antenna. 2% for the longest side after determining the half wave length at the lowest operating frequency…. The line isolator is made of 10 turns of RG8 on a half inch ferrite rod. Sep 22, 2008 · feedline terminated after 33 feet to a 4:1 balun. It has been my primary antenna for all bands since then. Its reputation for excellent performance is so good that it served as one of the antennas in setting two 40 meter Aug 17, 2021 · The highest part in construction will be the balun. The DX'pedition team also had a beam and verticals, but the New Carolina Windom was the antenna they used. COVERAGE: 80/40/30/20/15/12/10m This antenna was built just in time for CQWW CW in 2011. A 1 ÷ 6 auto transformer matched the After many requests we have created a compact, special balun for OCF antennas with vertical radiators. net is a Web site dedicated to ham radio (amateur radio). This antenna is designed to be used at heights of only 25 to 45 feet. A Simple 7-Band Wire Antenna. 3048 m (30. The beauty of this antenna is its simplicity yet ability to cover 7 of the 8 amateur radio hf bands. My first HF antenna! La Antena Windom - modelo Carolina- es una antena windom a la que se le ha añadido un un radiador vertical. The feed-point of this type of antennas (off center) has an impedance of about 300 Ohms. Its difficult to test the balun or transformer with an ohmmeter and I think the best way to test them is with an antenna analyzer on the 50 ohm side and put a non inductive resistor across the antenna wire terminals. Current type 4:1 (200:50 Ohms) BALUN is another product designed for OCF antennas (Off Center Fed) also known as Windom antenna. It was designed to cover 80, 40, 20 15, and 10 meters. 20m Loft Dipole – A crude shortened monoband dipole that fits in the average loft. Oct 18, 2017 · Windom – Dipolo asimmetrico o antenna Windom (detta anche Carolina), dal nome del suo autore, è stata realizzata nel lontano 1929. 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. Long side length = . 5 20 14. It evolved from Loren Windom's original 1929 design for an off-center fed dipole antenna. Buckmaster OCF Dipole Antennas. I was very happy with it's performance and the SWR was low on all bands. The Carolina Windom was devised by Edgar Lambert, WA4LVB, Jim Wilkie, WY4R, and Joe Wright, W4UEB, who modified Windom’s single wire-fed antenna to form a dipole fed with a parallel feed-line. How do you determine how much of … Continue reading → Sep 8, 2023 · One even grows… Carolina Windom Going to Carolina in your mind? Carolina Windoms are basically Off-Center-Fed Dipoles (OCFD) with a few twists. The second 'box' at the end of the coax run attached to the balun and antenna is a choke and stops the common mode from travelling any further down the feed line. My Carolina Windom Antenna 160M Special I had a Carolina Windom antenna up for nearly 10 years before a vicious wind storm brought it down, smashed the matching transformer and cracked the line isolator. Deployed Measurements VSWR and more for the finished 80M Carolina Windom ( Adjusted for the General phone upper portion of 75M ) F MHz VSW Rs 3. A 1 ÷ 6 auto transformer matched the antenna to the 60 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. The Carolina Windom uses the 4:1 current BalUn at the feed point to a 26 foot vertical coaxial radiator. When building or replacing the balun at the feedpoint of a Carolina Windom that incorporates a vertical coaxial radiator, a voltage balun like our model 4125 should be used so RF will pass to the vertical radiator. When building or replacing the 4:1 balun at the feedpoint of a Carolina Windom that incorporates a vertical coaxial radiator, a voltage balun like our model 4125 should be used so RF will pass to the vertical radiator. The antenna consists of asymmetrical horizontal radiating elements being driven at 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. Richard warned of significant risk of RF on the outer (inner?) braid of the coax. Cette antenne fonctionne assez bien mais, en tant que windom, ne couvre finalement que peu de bandes avec un ROS acceptable. 9 1. It's a dipole fed off center with a 4:1 current balun at the offset feedpoint. It provides common mode The New Carolina Windom Len Carlson - K4IWL As with all ham stations QRO or QRP, ten percent of a station’s success in quality QSOs is the equipment and the operator. The Carolina Windom is an fed dipole (OCFD) antenna, and proper connection essential for designed. The New Carolina Windom uses a 4:1 balun built into the center insulator and a 10 foot vertical coax radiator to provide both horizontal and vertical radiation components. M0UKD uses 10 feet of 50 Ohms cable as the vertical radiator for his Carolina Windom antenna which needs no tuner at 40m, 20m and 10m. Suppose 80m was sacrificed by making the antenna half size resulting in a matched antenna for 40, 20 and 10m. They will then be able to use a 6:1 current balun (RF choke) at the feedpoint which will conveniently allow the use of 50 ohm coax which most ham radio operators like to use. La antena se alimenta con un balun relación 1:4, siendo la línea coaxial de alimentación simultáneamente un radiador vertical (cable coaxial de 50 ohmios), además de línea de transmisión. (50Ω to 200Ω) The 10 feet vertical radiator really does radiate, and offers vertical radiation to the existing horizontal radiation, and therefore adds to Jan 1, 2021 · Title: Test a Balun? - Carolina Windom Problem Post by: Carl WA1KPD on August 18, 2014, 12:59:56 PM Happy Monday, Several years ago I bought and installed a full size 160-6 Carolina Windom antenna. My experience with a Radio Works Carolina Windom 160 special with 75' of RG-8x lead is as follows. The Off-Center-Fed Dipole is a Dipole whose feedpoint is at a point removed from the center of the antenna. The Original Windom, as I will call it, was the first known design of an off-center-fed antenna designed for use by amateurs on the ham bands. Magnetic Loop Antennas – Experimenting with a VHF magnetic loop and a larger HF one in the back garden. It's an OCF antenna with a balun to a length of coax that uses common mode current to intentionally act as a radiator, giving the antenna both a horizontal and vertical signal. 48 cm)Wpierw nazwa. I’m going to look a… THE OCF FD4 (FD3) WINDOM ANTENNA FD4 (80/40/20/10 m) The 4-band Fritzel model FD4 is a special version of a Windom antenna. For details on Carolina Windom construction see our push up poles antenna projects page. Covers NVIS, baluns, current distribution, and measurements. Oct 17, 2011 · The total cost of materials was $40. Most tuners would work better if the balun passed the line impedance through without stepping impedance down. Manager Reviews Home Reviews For: RadioWavz Carolina Windom Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Sep 11, 2025 · RadioBanter » rec. In any case the design and quality of the balun is just as important as the impedance ratio of the balun. That would seem like a challenge for a 105 foot long horizontal antenna. This antenna is in use the world over by DX'ers and DX'peditions. 5 KW. The Windom got put away and I used the wire for other antenna projects, the balun and choke which remained attached got stored away in my shed. 2% from one end. 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 pattern at low angles - Carolina Windom Problem « on: August 18, 2014, 12:59:56 PM » Happy Monday,Several years ago I bought and installed a full size 160-6 Carolina Windom antenna. <br /> Appreciate some advice on baluns and chokes for a 40-10m OCFD Windom Antenna. Operation on 12,15,17,30,60,80m will be tuner depend 4:1 Baluns are useful between balanced lines for center fed Zepps, Off-center fed (OCF) dipoles with coax, G5RV antennas, full wave loops, NVIS dipoles that are close to ground and have impedance levels near 200 ohms or high impedance feeds for log periodic beams. 4 20 7. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. The performance characteristics are quite outstanding. Its reputation for excellent performance is so good that it served as one of the antennas in setting two 40 meter After many requests we have created a compact, special balun for OCF antennas with vertical radiators. Two different answers. to/3hplfbnmore Manager Reviews Home Reviews For: Radioworks Carolina Windom 160 Special Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 8 1. 8 to 40 mHz, and handle powers up to 2 KW PEP (at SWRs of less than 3:1). Learn about its history, design, and practical use. 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 pattern at low angles It sounds like a "Carolina" Windom. I would like to use 75 Ω coax instead. With a 4:1 Balun transformer is possible to feed easily by using a coaxial cable of 75 Ohms (300/4=75), like RG59 or RG11. RadioBanter » rec. How do you determine how much of … Continue reading → - Carolina Windom Problem « on: August 18, 2014, 12:59:56 PM » Happy Monday,Several years ago I bought and installed a full size 160-6 Carolina Windom antenna. - Carolina Windom Problem « on: August 18, 2014, 12:59:56 PM » Happy Monday,Several years ago I bought and installed a full size 160-6 Carolina Windom antenna. The 1:1 choke balun at the bottom of the 22 feet radiating vertical effectively isolates it from the coaxial feedline going down to the transceiver. Mar 22, 2009 · I used spare parts from my Windom antenna balun to make one that has terminal rings for the 450 ohm feedine to be connected to the inner core and a 50 ohm UHF connector on the bottom of a 2 gang weather proof electrical box. I've never used one Manager Reviews Home Reviews For: MyAntennas OCF-8010E-3K Windom Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. This convenient feedpoint New Carolina Windom The New Carolina Windom antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. 66K subscribers 34 Aug 23, 2008 · Choke Baluns are a good thing and antenna manufacturers should provide them on their balanced antennas. 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. 3 2. same reasons it differs from a G5RV. It is effective on 40, 20, 15, and 10 meters Unadilla Antenna Manufacturing company W2AU is the preferred Balun of Amateurs worldwide. 8% for the short horizontal element and a ratio of 62. Fritzel used the shown dimensions of 13. 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 pattern at low angles The New Carolina Windom is an innovative antenna designed for QRP operators, emphasizing the importance of antenna efficiency in achieving successful QSOs. By serendipity, it also covers the 17 and 2 meter bands. 5 KW, and the RadioWorks balun was rated for 200 watts, all other bands were rated at 1. 7-m in the 1960s. The &q This DIY vertical multi-band Windom antenna offers a practical and effective solution for amateur radio enthusiasts seeking a versatile and compact antenna for HF communications. 622 (62. amateur » Antenna > Carolina Windom revisited: 4 to 1 balun does nothing to choke RF? M0UKD (https://m0ukd. 8-m and 27. Most baluns inside antenna tuners step the antenna impedance down. Its reputation for excellent performance is so good that it served as one of the antennas in setting two 40 meter 1958 - Buck K4ABT reads about Gillette Guanella “current” type balun and Thomas O’Meara’s papers, “Analysis and Synthesis with the Complete Equivalent Circuit for the-Band Transformer”,which leads to some design changes being made to Buck’s version of the Windom antenna. My thinking is that the 4:1 balun acts as a voltage type and will do windom_balunsRadio old Museum | Practice with the soldering | SWL Shortwave DX Radio | Microwave | EME Ham Radio Satellite | Propagation Solar Cycle | Grid Software | Propagation prediction | Qrp low power | Telegraph Morse code | Antennas Satellite | About Rtty mode | Beacon | Band Plan Ham Radio | DX cluster software | PSK31 software | Radio portal | Amateur Television ATV | VHF Activit M0UKD uses 10 feet of 50 Ohms cable as the vertical radiator for his Carolina Windom antenna which needs no tuner at 40m, 20m and 10m. Ic A Broadband 4:1 Voltage BALUN Ruthroff 4:1 Voltage BALUN with Unbalanced Load New Carolina Windom Antenna Choke UNUNs Choke UNUNs FCC050-HO5-A Based on my research, the original Windom antenna design used a 4:1 balun, and the wire lengths of the antenna I bought look to be pretty close to specs per that design, which is why I suggest this option. In the case of normal dipoles, we try to avoid this from happening. For the 4:1 balun he uses 17 bifilar turns on a half inch ferrite rod. It describes how the original Windom used an open-wire feedline that functioned as a radiator. ) 1980-Today: Much testing and advances in simulation tools resulted in new feedpoint splits, better performing baluns, and even an end-connected OCFD M0UKD (https://m0ukd. Works 4, 7, or 8 bands on one length of wire, with no tuner required! Built like a tank with high-quality materials. The greatest drawback for me would be supporting all that weight hanging from the feed point. amateur » Antenna> Carolina Windom revisited: 4 to 1 balun does nothing to choke RF? Jul 10, 2019 · La Carolina Windom (en version 'mini-FD') est une FD4 avec un « choke-balun » sur le coaxial pour en isoler une partie afin d'avoir une composante verticale et combiner les deux principales polarisations. Here is my home HF antenna. Manager Reviews Home Reviews For: Radio Works Carolina Windom 160 Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 7 71 3. The author provides instructions on cutting the wire, attaching baluns, and the windom is an off center wire multiband antenna 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 here is another model with coaxial feeder which is compatible with solid states 50 ohm output transceivers . Here is the problem with AI. The document describes how to build a DIY Carolina Windom antenna for multi-band operation. MFJ 913 4:1 balun: https://amzn. Są to informacje przekazane nam przez kol. So when I got back into QRP a few Sep 13, 2024 · Does anyone have experience successfully building a Carolina Windom antenna? I built this one by the book but can't get it to tune! I am measuring 5:1 SWR at 7100 kHz, which is the design Antena Carolina Windom. Overview Hari Windom 80-10 HP The Windom antenna is a dipole where the balun is not in the middle but slightly offset. Jan 6, 2025 · M0UKD gives detailed instructions for construction of the Carolina Windom antenna including the needed line isolator and 4:1 balun. I asked if it matters which wire is connected to each side of the balun. 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. In some cases, this allows for a more favourable suspension and a shorter feed line (less weight!) because the balun is closer to the house. I am thinking of using a 4:1 Current Balun at the feedpoint as it performs 3 functions. I run 1. Note that Palomar acknowledges that the feed-line choke doesn’t kill enough common mode to keep RF out of the shack, so they recommend purchasing an additional “coax noise filter May 19, 2011 · THE OCF FD4 (FD3) WINDOM ANTENNA 19 may 2011 FD4 (80/40/20/10 m) The 4-band Fritzel model FD4 is a special version of a Windom antenna. RadioWorks and others sell balun as rated up to 5 KW on 50 MHz and below. The Carolina Windom, as the name implies, is a variation of the single wire-fed Windom antenna. This is especially true in QRP since with very low power, by comparison to the Power Mongers, we need to get more ERP per watt out into the ether to be heard. Oct 20, 2025 · Rated for operation over 3. 35 2. At the end of the vertical radiator a line isolator, essentially a foot long ferrite sleeve, is placed to choke off the common mode current that form on the outer braid of the coaxial feed line. I've never read of using a 1:1 unun right after a 4:1 balun to minimize RF on the outer coax. The wire portion of the antenna is the counterpoise for the vertical radiator. A current balun is the proper choice for an OCF dipole, since it effectively chokes common-mode current from standing on the feedline. 8% for one side and 62. Explore the Windom antenna, a favorite multi-band HF antenna for ham radio. 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. 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 pattern at low angles Homepage van Maarten Ouwehand PG1NCreation date : 11/08/2007 @ 00:50 Last update : 15/09/2024 @ 14:40 Category : Multiband HF Projects Page read 22354 times The VK Windom The next thought that occurred was that the lowest three bands could be reasonably well matched with a suitable balun but 10m would remain a problem. The antenna is mounted 50' off of the ground. They also need a good 1:1 choke balun in the feedline Feb 27, 2021 · The Carolina Windom uses the 4:1 current BalUn at the feed point to a 26 foot vertical coaxial radiator. W2AU Baluns are transformer designs with ferrite cores to provide 95% minimum coupling efficiency. function connects The longer wire of the antenna element the "radiating" conductor side) of the 4:1 balun/matching unit. Nov 1, 2011 · testing homebrew 4:1 Voltage Balun for a Carolina Windom 2e0vov 2. Google “New Carolina Windom” antennas. The combination of horizontal high angle radiation and vertical low angle radiation accounts for the alleged excellent performance of the Carolina Windom. Jun 17, 2019 · The coax fed "Carolina Windom" OCFD types are usually tapped around the 200 ohm point where a 4:1 transformer is appropriate. 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 Event in October 2024. Manufacturers of off-center-fed dipole antennas choose an offset feedpoint where the theoretical impedance is approximately 300 ohms on the antenna's *fundamental* frequency of resonance. 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. The modern Windom is improved by using coaxial cable for the feedline instead of open wire. W2AU’s operate at a low VSWR from 1. In one Navassa DX'pedition, of the 33,000 QSOs made, more than 27,000 were accomplished with this antenna. Vedremo come eseguire un calcolo semplice e veloce per realizzare l’antenna multifrequenza, rapidamente, per nuovi collegamenti internazionali e che risuona bene anche sulle armoniche. Today, many radio amateurs are using multiband Windom antennas with more than satisfactory results. The current ARRL online subgroups Get some #14 stranded wire, get a 4:1 current balun use the dimensions from the old Radio Works windom and use the MFJ's 4:1 current balun and the 1:1 choke balun and make the down coax and its done. 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. One of the drawbacks is that it requires an antenna tuner and a very good ground system. I only use about 15 ft of coax from the shack outside to the balun box. I'm building a Carolina Windom antenna. 2%) X 66 = 41. This antenna changes the feed slightly to 38% off-center and makes a section of the coaxial feedline part of the antenna, radiating RF. It builds upon the original Windom design, featuring a more effective off-center fed dipole configuration that operates on multiple bands with a focus on low angles of radiation. In 2020 I replaced it with a similar OCFD having an improved Balun and a different feedpoint. For one, the 4:1 Balun has been moved to the antenna radiator and is built into the center insulator. Carolina Windom – Construction details for a 20m (66ft) off centre fed ‘Carolina Windom’ multiband antenna. It had the same dimensions as the multiband Windom antenna, but fitted with a 200Ω (4:1) balun in its feedpoint and fed with coax. For most people, a 4:1 balun is going to provide a better match than a 6:1 balun. Apr 11, 2023 · This is what makes the vertically hanging portion of the coaxial feedline radiate RF energy. Additionally, the so called Carolina Windom employs both a 4:1 balun where the matching stub meets the horizontal elements, and also a 1:1 current balun (line isolator or choke balun) at the feed point where the the entire antenna system is ARRL manages several online forums where all radio amateurs - ARRL members and non-members alike - can discuss issues and topics in two-way conversation with ARRL staff and leadership. Apr 21, 2021 · The Carolina Windom is a variation of the OCF with a choke balun (line isolator) placed 22 feet below the 4:1 balun on an 80-10m off-center fed antenna. Unfortunately I am no antenna guru, and even with all the information I've found on the Windom, the data is a bit ambiguous on this point. It requires a 4:1 voltage balun to match the legs and a separate 1:1 choke balun to isolate the feedline. The best match obtainable for a simple matching device comes close to the ideal ratio, transforming 50 ohms by a factor of After many requests we have created a compact, special balun for OCF antennas with vertical radiators. Its reputation for excellent performance is so good that it served as one of the antennas in setting two 40 meter "mile-per-watt" world records of nearly 4,000,000 miles-per watt. 3 days ago · 6-Band Windom 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 New Carolina windom antenna PDF file by QRP Expressions by By N. FIG. Manager Reviews Home Reviews For: Radioworks Carolina Windom 160 Special Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. A Carolina Windom is a type of off-center fed dipole antenna that uses part of the feedline as a vertical radiator. General design is layout is below. 7 31 Measured with an MFJ-269 antenna analyzer 160 Meter Windom Questions ? Description OCF-8010E-3K OCF antenna (Windom) This is the OCF Dipole antenna also known as Windom antenna fed at 19% of one end (19/81% ratio). Making a balun for 75-ohm coax Several articles I've been reading talk about making a 4:1 balun to feed a Carolina Windom antenna. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. With Xena Warrior Princess in the background this is the center support structure for the Windom. The antenna can cover 160-6 meters but 15 meters and WARC bands are typically only The CAROLINA WINDOM 40tm outperformed the G5RV nearly as For long-haul operation the “Short” CAROLINA WINDOM is well as the Short CAROLINA WINDOM 40tm until the bands in a class by itself. This prevents RF from being fed back into the radio operation position. The downside of this The formula to compute the length is the standard 468/frequency with the 4/1 Balun at 62. The New Carolina Windom is essentially an off-center-fed (OCF) dipole. Janusza VE3ABX - znanego konstruktora licznych typów anten, zaprzyjaźnionego z naszym Klubem. If you operate 6 meters with this antenna, make sure the balun is rated for the power. Ninety percent is the antenna. VerFcal length for RG58 from balun to choke = 4 to 1 raFo (meter band / 4) 40 meters / 4 = 10 feet Apr 22, 2014 · So under orders I removed the Windom and a few other antennas and instead constructed my first cobweb as a single replacement. 2% for the longest horizontal element. Only one application where this balun is not recommended. Designed for outdoor use to match 200ohm feed line to 50ohm cable or 300ohm feed line to 75ohm cable. T. Oct 19, 2011 · The New Carolina Windom uses part of the feedline as a vertical radiator — the voltage balun used to feed the off-center fed dipole allows common mode current to travel down the feedline. Reviews For: Radio Works Carolina Windom 80 Special Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. This antenna wil be resonate on 6,10, 20 & 40m. These include multiple resonant dipole arrays, trapped dipoles, resonant loops and the off-center fed dipole, OCFD. Perfect for amateur radio. 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 pattern at low long wire antenna height questions1 - 20 of 70 1 2 3 4 Oct 25, 2015 · There are a few ways to build multi-band HF antennas. Its character-istics made it possible to use one antenna to cover all of the harmonically related ham bands. Listed under the Antennas/Windom category that is about Windom antenna. The New and Improved Carolina Windom Antenna and 1⁄2 Wave End Fed 20 Meter Vertical and Sloping Wire Antennas EZNEC analysis by Pete Rimmel, N8PR Keeps RF off the Coax below this point / (part of)/ Homemade 'Carolina Windom' antenna Here is my home HF antenna. A Two-Band Fan Dipole, Trapped Dipole for 75 and 40 Meters, The Extended Double Zepp Dipole, The G5RV Dipole, Off-Center Fed Dipoles, One wavelength Off-Center Fed Dipole, Carolina Windom, Windom Dipole (Fritzel Type), End-Fed Antennas, End-Fed Zepp, Alternate Method of Feeding an End-Fed Zepp, End-Fed Random Length Antenna, The Half-Sloper After many requests we have created a compact, special balun for OCF antennas with vertical radiators. Carolina Windom is thus an unbalanced antenna. So that being said the measurements vary depending on who you talk to. Prawdziwa The document discusses the history and design of the Windom antenna, an early multi-band antenna design. Unlike typical antennas, this is a non-resonant, Off Center Fed Dipole (OCFD) antenna. The theory seems to be that at feed point. In the case of normal dipoles, we try to avoid this La Antena Windom - modelo Carolina- es una antena windom a la que se le ha añadido un un radiador vertical. Sep 23, 2018 · I would recommend a good common mode choke balun as by design, an OCF/Windom can have RF on the coax and my recommendation for the best common mode choke is, you guessed it, MyAntennas. com/homebrew/antennas/h) gives detailed instructions for construction of the Carolina Windom antenna including the needed line isolator and 4:1 balun. radio. Feb 12, 2025 · eHam. This allows the 22 foot vertical section of feedline to act as a radiator. It will provide years and years of great service and great contacts. If the antenna is really high, perhaps a 6:1 balun would be better. It covers 6 bands, 10-12-15-17-20-40m. This is the 200Ω point, hence the 4:1 balun. Now, how was a Windom antenna developed? It began with a center-fed, half-wave dipole. Reviews For: Radio Works Carolina Windom 80 Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. This is one of the most rugged and dependable OCF/Windom antennas on the market today. 05 feet = 41 feet rounded So we have the short length of 25 feet, and long side of 41 feet using the formula. So from a mechanical standpoint the best way is to hang the feedpoint at the apex, with all that weight hanging straight down from the hanger. . Does that translate to a 8:3 balun ? Sep 8, 2023 · One even grows… Carolina Windom Going to Carolina in your mind? Carolina Windoms are basically Off-Center-Fed Dipoles (OCFD) with a few twists. One says the short wire goes to Learn about the Carolina Windom antenna for portable HF operation. Jedna stopa = 0. It needs no tuner on 40m, 20m and 10m. The Carolina Windom uses a ratio of 37. The big difference is in the balun that you use to feed the antenna. Coax fed OCF ‘Windom’ antenna. The document describes the development and design of the New Carolina Windom antenna. Its simplicity of construction, multi-band capability, and favorable performance make it a valuable addition to any radio shack. Len Carlson, K4IWL Smithe Windom Six Band HF Windom antenna Holding true to the original Windom formulas, I used a ratio of 37. CAROLINA WINDOM W WERSJI 80m W większości publikacji wymiary anteny podawane są w stopach. The first step in constructing my Carolina Windom was to cut the antenna wire to This more recent, New Carolina Windom, version has some very interesting characteristics as seen in the drawing above. Either way it’s a trade-off. I build an 80 meter off center fed dipole antenna for this year's ARRL Field Day Event. Both of these baluns are readily available and relatively inexpensive. 1980s: Carolina Windom (uses the coax as a radiating part of the antenna, with the common mode choke some way down the coax. 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. After many requests we have created a compact, special balun for OCF antennas with vertical radiators. the offset dipole will have a 200 Ω impedance, so they use a 4:1 balun to match to 50 Ω coax. 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 pattern at low Apr 2, 2014 · A 'windom' or more correctly, an off center fed antenna (OCF), will certainly work on multiple bands (A 'Windom' is a single wire fed antenna worked against ground). Perfect for use with folded dipole and Carolina Windom antennas. Unlike the usual designs for these, he is using half inch ferrite rod as the core which seemed quite easy to make. In practice, under this condition we have an SWR ratio of 1:1,5, but that is no problem if your transceiver 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. This style windom has a 4:1 balun and is rated for 1500 W. SO-239 connector. The article provides detailed instructions for constructing Jul 14, 2013 · Transform your PDFs into Flipbooks and boost your revenue! Leverage SEO-optimized Flipbooks, powerful backlinks, and multimedia content to professionally showcase your products and significantly increase your reach. The groups are aimed at enhancing communication among ARRL leadership, staff, members, and prospective members, in a manner that enables timely updates and collegial discussion. Tak szczerze to nie podpada ta antena pod oryginalną definicję anteny Windom. 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 pattern at low angles Manager Reviews Home Reviews For: Radio Works Carolina Windom 160 Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. 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. 4 41 7. He uses a 4:1 balun at the feed point of the OCFD. 175 2. It also discusses adjusting the feed point location and using a balun to match the antenna to 50 ohm coax. It is an off centre fed dipole, with 10 feet of vertical radiator. The result is an inverted-vertical antenna located high in the air and free of ground losses. Mar 30, 2023 · HF Antennas Wire antennas Multiband Wire antenna "Windom" 160-10 m Last Updated: Saturday, 22 November 2025 01:46 Oct 22, 2011 · 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. Mar 2, 2009 · The Off Center Fed Dipole, (often abbreviated as OCF Dipole) is a simple multiband dipole antenna with good performance. Dec 28, 2012 · The characteristics of the CAROLINA WINDOM outlined on the previous pages hold for<br /> the CAROLINA WINDOM 160 Special and the CAROLINA WINDOM 80 Special. sozwm joevp vijc kqph wxkoeyy lzom rupi uirig tmsf brdbr bqqxh jqerev ctcyvz btlon dqblomv