The tuner in the images below is in BYPASS mode. end to end 14awg. DX OCF WINDOM 80m,40m,20m,10m by RADIOWAVZ Band width: 80M,40m,20m,10m Typically with out a tuner. Since 1992, you heard the CAROLINA WINDOM from Navassa and Albania among several other DX'peditions. Meetings are normally held on the first Thursday of each month at 8pm. The balun enclosure is much smaller, 3" x 2" x 1". 160-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 240' Dipole with 100' Feedline $169. Of course an antenna is an. 9(feet(round(to(66(feet)(for(total(half(wave(length. multiband center loaded off center fed dipole cl ocfd antenna that work on 80m 40m 30m 20m 15m 10m. If I only have the budget for one HF antenna, should I chose a vertical or a horizontal antenna? Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. DX Engineering is your #1 source for wire antennas. I'm using it to demonstrate the resonance of the Windom on different bands. Spiderbeam was founded in the year 2000 by DF4SA, sparked by his passion for highly competitve radio contesting during portable, outdoor operations, fielddays, DXpeditions, etc. Our 7-Band antennas are OCF (off-center-fed), with a 45 foot leg and a 90 foot leg, totaling 135 feet. Aural zero-beat with 1000-Hz tone, carrier offset +1kHz. dual band dipole - 40 and 15 metre bands Dual band dipole for 40m (7 - 7. 80-40m loaded dipole. This antenna is not meant to be used for a permanent installation. Buckmaster; Radio Wavz 40m DX(OCF)Windom 66ft. 80/40 Meter Loaded Dipole Antenna After having success with my resonant end fed antennas I decided that I wanted to build a more traditional resonant half-wave antenna that was also considerably shorter than normal. 03/min RX -- $0. WB2WIK , Feb 28, 2014 #2. Dxers love 40m for the tremendous night propagation opportunities - beginning an hour or so before sunset and continuing to an hour or so after sunrise, 40m can get it done over paths of darkness. The advantage of a 1/2 wave OCF dipole fed 1/3 of the way from one end is that it can be used on the fundamental frequency and its even harmonics. Study of G0FAH Off Centre Fed Dipole (OCFD) (40m-20m-15m 10m) Bill Wright (G0FAH) described his 4-band OCFD In QST during February 1996. The SWR is generally below 1. FD3 (40m-20m-10m) OCF antenna - G8ODE. The biggest and best ham radio classifieds on the web! Buy, sell, trade HF and VHF equipment, towers, antennas, rotators and more!. OCF Vertical Dipole Mounting Scenarios Ground, Boats, Boat Docks, Bulkhead, Roof, & Towers; DX Flagpole Antenna, Customer Reviews, Pics, Audio, & RBN Signal Data Q. UV insulated stranded wire The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. 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. Technical - The OCF Alpha Match is designed around a specific Alpha Antenna balun, which is based upon the dual core 4:1 Guanella balun that delivers 200 ohm impedance characteristics to radiating wire elements, while inherently minimizing common mode current. A trapped dipole is a dipole with blocking filters fitted at the operating wavelengths. The RadioWavz DX (OCF) Windom is a off center fed (OCF) dipole antenna that exhibits outstanding performance on all bands. Jan 06, 2013 · The traps make the antenna act as if it were a resonant quarter-wave vertical. To address these concerns a spiral antenna spreadsheet model was created to do the calculations for the designer. The first (and most important) goal was to get the FULL 40 meter band at less than 1. Diamond’s new CP5H is a five band (40M, 20M, 15M, 10M and 6M) trap vertical antenna with trap radials. loop antenna for 10m 35 59. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. Without Radials. Has some traps and some full sized elements. The GU4-HF-250-M balun, used on this antenna, uses the same cores that are used in the standard QRP OCF baluns. Impressive electrical performance means nothing if you have an antenna with poor mechanical design. Antenna modeling is done by the 4NEC2 software program written by Arie Voors. I imagine since you want an OCF, you'd like to use it on multiple bands; if you want "40m CW only," I'd ditch the whole OCF idea, use a 1:1 current balun, and center-feed it. OCF Antenna 10-40m 1Kw 69ft. UV insulated stranded wire. I connected my SGC-211 ATU to the base of the vertical and laid out about 6 short radials on the grass. FD4 HF Dipole Antenna 80m 40m 20m 10m windom ocf wire balun unun multiband. Can be moved on a pick up roof carrier. Amateur Wire Antennas : Want to work DX with little space. 6 dBi at 70' up, with an elevation angle of maximum radiation of 27 degrees above the flat, uncluttered terrain assumed by NEC programs. KG4URP - Conditions this year were much better than last--managed to double my score with the help of this year's participants. DX (OCF)Windom Sort by: Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg. It was a challenge dealing with the frequent fading of signal at inopportune times which prevented completing a number of QSOs. The table below tabulates the results. Takes a 40M element available from manufacturer. Antenna Width: 246 ft. Targeted Market / Customers: Portable and Permanent Installations; Great for Stealthy Applications (when challenged by HOA's) Great for colder climates where snow, ice, and strong winds, challenge other lightweight. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1 current balun. * * * A Bad Rap?. Perfect for building a dipole. Aural zero-beat with 1000-Hz tone, carrier offset +1kHz. You may have great equipment and a powerful transmitter, but without the correct antenna, contacts will be marginal, if not impossible. International Antenna Company (IAC) Has Permanently Closed. antenna measures only 51 feet across the top for 40 thru 6 meter operation, and is fed at the center through a low loss 450 ohm ladder line. The length calculation being 492/freq (in feet); 150/freq (in meters). La información sacada gentilmente por mi amigo Walter LU7MDF de Mdza. 66 feett (20 m) long. We don't upload Ham Radio Testing The N9sab Ocf Dipole At Qrp Night, We just retail information from other sources & hyperlink to them. 4 meters ) leg, totaling 135 feet or 41 meters setup as T Top. You can also enjoy multiband performance without traps, coils, fans or other schemes. It seems to work very well and is very quiet! One question please! Is the diameter of coil former 5. I imagine since you want an OCF, you'd like to use it on multiple bands; if you want "40m CW only," I'd ditch the whole OCF idea, use a 1:1 current balun, and center-feed it. you may find them to be excellent multiband antennas. OCF Antenna 10-160m 500W 256ft. For a NVIS configuration (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high. , about ¼ wavelength. A center-fed half-wavelength wire antenna cut for 7. de Whereas a Dipole is a half-wavelength long radiator, fed in the Center of two equal length legs, the Off-Center-Fed Dipole (which I prefer to call a WINDOM) is a Dipole whose feedpoint is at a point removed from the center of the antenna. Update 30-03-2016: Since I wrote this article I updated my outside Windom to an 80m OCF Dipole. This compromise gives good multi-band operation with a small antenna tuner but sacrifices having wide VSWR BW on lower order harmonics. The larger the wire, the wider the bandwidth. This improves the balance by forcing equal currents into each side of the antenna (which a single-core 4:1 Guanella does NOT do. Our antennas are designed to withstand high wind speeds and can be ordered with optional trussing kits if heavy icing is a concern for the larger sized Yagi elements especially on 40M and 80M. Trap verticals need radials to operate effectively, and the more the merrier. > Dipolo rígido 40m ASP DR-40. Jan 16, 2014 · The building itself has some interesting history, as you might imagine. Aural zero-beat with 1000-Hz tone, carrier offset +1kHz. Buckmaster OCF Dipole Installation Diagram (Courtesy Buckmaster) The OCF dipole is usually installed in an inverted-V configuration so the ends do not need to be very high off the ground (~10 ft is good). If I only have the budget for one HF antenna, should I chose a vertical or a horizontal antenna? Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The basic antenna comprises:. 66 in total. I was able to TX for 3000km only using 5 watts in the 40M band and a report of 5/5! I was very happy with the overall performance of this antenna: multiband from 40 to 6 meters band, low SWR. 160-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 240' Dipole with 100' Feedline $169. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Off Center Fed (OCF) Dipole Antennas - Ham Radio Site - [HOME] Dj0ip. For a NVIS configuration (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high. The vertical elements are 6' above ground at the ends, 3' in the center. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. 03db and so is the lowest loss balun I could find. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. This antenna works very well on four HF bands such 80m, 40m, 20m and 10m. Hope you can translate English, have built this 'short 40M' vert. This is a Custom Built version of the CAROLINA WINDOM® 40. If it is a straight dipole, fed with coaxial line, what frequency is it cut for? Or, is it a fan dipole? There is no such thing as a dipole for 40 - 10. I have a 6m-40m OCF dipole, souldn't I be able to make it a Carolina windom by adding a 1:1 balum 10ft from the end of the feed line? The lengths are roughly the same across the top. OCF (Off-Center Fed) Dipole for 80m and 40m Carl Luetzelschwab K9LA October 2019 This month is another break from tradition in that I won't be talking about solar issues or ionospheric issues or propagation. 20-40 meter inverted "V" dipole questions. Antenna Width: 136ft. An ultra-lightweight 4-Band wire dipole - weighs less than one pound, including 40' of coax. After investigating the FD3 3-band 40-20-10m OCFD, he. 135 ft (41. I decided to stick to 40m with my K1/4w and Butternut vertical. Many claims are made for variations of the theme, but the essential common feature is that the offset feed point provides a feed point impedance that is not too unsuited to 50Ω coaxial feed line at the fundamental resonance of the. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. end to end 14awg. If you want to know the exact amount that you are paying for your air conditioner, breeze through this and then go to the next section. 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. I use a short (screwdriver) vertical for DXing 40M and I snag great DX all the time with it. don't use multiple beads - use large toroids (ft240-31 or ft240-61) with multiple turns of coax. CAROLINA WINDOM® 40 Plus The CAROLINA WINDOM® 40 Plus is a special modification of the standard CAROLINA WINDOM® 40. Wire Antennas. The G5RV Pro Junior Covers 40m-6m Rated to Full Legal Limit 2KW Rugged Weather Proofed Quality 450 Ohm Ladder Line - Stranded Copper Wire High Quality PVC Dogbone Insulators Uses Top Quality 1:1 Balun This G5RV is 51 feet long. Our 7-Band antennas are OCF (off-center-fed), with a 45 foot leg and a 90 foot leg, totaling 135 feet. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. The off-center-fed dipole and balanced transmission line. Current Amplitude, at 7. The other option is using the spiral dipole as a directional antenna with the same -2 dB dB gain for the signal it provides –25 dB on interference signal,. For a multi-band OCFD the sine waves show that there are two feed-points. 3' long) has a maximum gain of about 7. Various installations such as horizontal, vertical, sloper,inverted V etc. for sale is one w2au unidilla antenna center insulator + lightning arrester for hf dipole type antenna. Prices are subject to change without notice. ages ago n9ysq says: homebrew 20 m ground plane at home worked Spain first thing. CHRISTMAS IN THE DUBBO REGION – FREE POSTAGE INITIATIVE. The main category is OCF Antennas that is about Off-center-Fed dipole Antennas. Our coax surge protectors, surge protected coax switches and severe weather rated multi-band and single band HF antennas are ALL made in the U. La información sacada gentilmente por mi amigo Walter LU7MDF de Mdza. Fig 2—The improved coaxial-cable traps use two layered windings to provide an unusually high inductance-to-capacitance ratio, higher Q, and twice the breakdown voltage of single-. Dipole Elements: The horizontal elements are comprised aluminum tubing, starting with a 6-foot long 1. Wire Antennas. The half-wave dipole is very simple to construct. It is a half-wave long on the lowest frequency, and is fed from a coax cable. end to end 14awg. 03db and so is the lowest loss balun I could find. 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. The San Antonio Radio Club Field Day 2019!! The go-to antenna was our OCF-3K80 Multi-Band dipole. 5 SWR, calculations showed this would require a cage of almost 6 inches. The longest dipole that I can fit on my terrace, albeit with a dog leg between the dipole halves, is 2 x 10 m (2x 33 ft), i. 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. balun construction. don't use multiple beads - use large toroids (ft240-31 or ft240-61) with multiple turns of coax. I did find the best compromise OCF ratio to be 37% to 63% for the 40M to 6M antenna. The Windom (or OCF Dipole if you prefer), offers a true multi-band, experience without much use of a tuner. 3' long) has a maximum gain of about 7. Any power that is not dissipated in the feed line, tuner or transmitter is radiated by the antenna. The Off-Center-Fed (OCF) Dipole is a antenna design that uses the variation of resistance along a resonant dipole to provide a feed-point resistance that can be matched to a 50 ohm coaxial transmission line with a 4:1 balun. The G5RV Pro Junior Covers 40m-6m Rated to Full Legal Limit 2KW Rugged Weather Proofed Quality 450 Ohm Ladder Line - Stranded Copper Wire High Quality PVC Dogbone Insulators Uses Top Quality 1:1 Balun This G5RV is 51 feet long. L' antenna, quindi, consiste in una filare multibanda lunga mezza lunghezza d'onda della frequenza più bassa, come un normale dipolo; l'unica differenza sta nel fatto che mentre il dipolo è alimentato al centro senza niente di interposto, o al massimo con un balun 1:1, e funziona solo sulla fondamentale e sulle armoniche dispari, nella Windom il cavo di discesa è collegato a circa un terzo. Off-centre-fed dipole (OCF dipole) As the name suggests, the OCF dipole is not fed from the centre. Sign in | Report Abuse | Print Page | Powered By Google Sites. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. I imagine since you want an OCF, you'd like to use it on multiple bands; if you want "40m CW only," I'd ditch the whole OCF idea, use a 1:1 current balun, and center-feed it. She inhabited the mansion, along with her husband Alexander Van Rensselaer, for roughly three decades. The RadioWavz DX80 (OCF) Windom is ideal for those of you who do not use a tower and beam. 3 The FTP cable balun. The CAROLINA WINDOM® 40 is used by DX stations all over the world. 200 MHz (see below for possible settings) • Frequency coverage 30m (MHz): 10. EFHW-7510-2K 2000W Multi-Band End Fed Half Wave Antenna. The ultra lightweight matching unit not only matches the coax to the antenna, it also provides excellent choking resistance to suppress common mode current. moved to VK1HW. 0, the average take-off angle over average ground for bands 10m-40m is 20. FD3 OFF CENTRE DIPOLE. 03/min RX -- $0. I was looking at the page on Ham Universe and it seems like it would be that simple. Windom 10-40. (multiple wavelenghts). Can be moved on a pick up roof carrier. Nov 21, 2017 · Nashua Area Radio Society › Topics In All Forums › Elmering Forum › OCF Dipole Help This topic contains 12 replies, has 3 voices, and was last updated by Fred Kemmerer 1 year, 11 months ago. The DX Engineering Linear-Loaded Multi-Band Dipole (Patent Pending) is a 74 ft, lightweight yet rugged design that is usable with a tuner from 3. The dipole antenna is very well known among the amateur community so this may be old hat to many. I use a short (screwdriver) vertical for DXing 40M and I snag great DX all the time with it. 6 dBi at 70' up, with an elevation angle of maximum radiation of 27 degrees above the flat, uncluttered terrain assumed by NEC programs. 850-329-8783 6 Band hexagonal beam antenna covering 6, 10, 12, 15, 17, and 20 meter bands shipped to your door for only $600($540 + $60 shipping) The NA4RR Hexagonal Beam (commonly referred to as the hex beam) is a popular antenna based on the G3TXQ design. 20-40 meter inverted "V" dipole questions. So, what does a 40m dipole consist of?. The antenna is ideal for local communications within 1000-2000 km of your location or for DX depending on how high the antenna is mounted and in what configuration. The 7-Band antenna is OCF (off-center-fed), with a 46 foot ( 14. 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. Thank you guys, for choosing Maxcon!!! Thank you, Rosendo Guzman, N5YBG, for sharing the Photos!!. DX Engineering is your #1 source for wire antennas. I have a coax fed 160M OCF dipole that came pre-cut and performed admirably on all non-WARC bands (as advertised), except for 160M. (multiple wavelenghts). The antenna features. The G5RV was designed for gain on 20 and works on 40 with a tuner - The EFHW for 40m is a 1/2 wave 66' and works on 40, 20, 15, 10 without a tuner - I just built a matching box from plans online for the EFHW. Rick Sagers (W7YC) and David McAnally (WD5M) have been working on an Offset Center Fed (OCF) Dipole antenna project the past few weeks.  This improves the balance by forcing equal currents into each side of the antenna (which a single-core 4:1 Guanella does NOT do. I have previously made other trapped dipoles using the standard coax-trap design. If you do get RF problems in the shack make sure you have a good earth (see earlier). Because of "the half-wave rule" you may want to put up a vertical for 40 and 80M and a simple 23x22 foot inverted L should work well for that purpose. The dipole antenna is very well known among the amateur community so this may be old hat to many. It is not necessary to feed a dipole antenna at its center, although doing so will allow it to be operated with a relatively low feed-point impedance on its fundamental and odd harmonics. Still, I had fun on 20 and 40m. For a NVIS configuration (40M – 80M) the antenna must be installed horizontally with the ground and elevated between 9’ and 12’ high. Nov 25, 2015 · Introducing the W8AMZ 80–6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. 3 The FTP cable balun. 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. Welcome to Reddit's own amateur (ham) radio club. Portable operation could not be easier. Showcasing 10m 20 in stock and ready to ship today. The 40m OCF Dipole, also called FD-3, is one of the most popular multi-band antennas in Germany. $5 for the core, some scrap wire and your choice of connectors in a project box I got off ebay for $2 - Works great handles 200 watts. The balun enclosure is much smaller, 3" x 2" x 1". 22 Different Wire Antennas. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1 current balun. This item RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna - 40, 20, 10, and 6 Meters RG58A/U COAX CABLE 3 foot Jumper for CB / Ham Radio - Workman CX-3-PL-PL -Made in the USA MFJ Enterprises Original MFJ-1778M G5RV Junior Wire Antenna 40-10 Meters, 52 Ft Long. With the North to South orientation you would expect a stronger East to West pattern but this antenna is omnidirectional due to the low elevation (less than ¼ wave-length above ground). Simply cut two equal lengths of stranded copper wire. My center connector on the OCF is a 4:1 balun. Listed under the Antennas/OCF category that is about OCF Antennas. com in a single category. How does the DXV OCF Antenna compare to other well-known antennas such as the Hy-gain AV-680 and Cushcraft R9: *The Red inner rings are 80M, blue 40M, green 20M, and orange 10M. Rick Sagers (W7YC) and David McAnally (WD5M) have been working on an Offset Center Fed (OCF) Dipole antenna project the past few weeks. I thought if I could install a 40m doublet in my attic I might be able to load it more efficiently (due to less loss into a balanced line) for 80m. The full-size dipoles are spread out like a fan, hence the name Fan Dipole. Place a 1:1 Balun on the Antenna end of the Feedline. Simply cut two equal lengths of stranded copper wire. 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. EZ 40m monopole 8-3-1. It is a multi-band antenna and will transmit on whatever frequency it is cut for, and above. 30 meter dipole kit Half wave 30 meter dipole The Famous 40m-6m G5RV Junior Our G5RV Starter Series is designed for those looking for a high quality, yet inexpensive, G5RV for their home, portable operations or emergency go-kit. MFJ-2012 Power-Lite OCF Dipole Antennas work DX stations with ease because the Power-Lite OCF antennas are engineered to launch a powerful, globe-spanning signal. Australian GST is NOT payable for overseas purchases. Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Describe your experience with the RADIOWAVZ DX 80 (OCF) WINDOM and tell us why you give it the rating you did (required). Windom, W8GZ in QST for general coverage of HF bands. Jul 03, 2011 · All posts in category VA2SG Polar Bear No. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. Escuchar radio aficionados en tiempo real Elige la estación según zona y banda que quieras escuchar y después sintoniza la frecuencia (Te puedes auto escuchar según la propagación). The image shown above has the 40m linear-loaded wire plus 20m+15m wires – The overall length of this aerial is 12m. This is particularly true at our fairly low 40 foot test height. The G5RV was designed for gain on 20 and works on 40 with a tuner - The EFHW for 40m is a 1/2 wave 66' and works on 40, 20, 15, 10 without a tuner - I just built a matching box from plans online for the EFHW. One separate dipole for each band. - 160/80/40 meter band - trapped dipole - 2007. It is quite common to see a balun in wire antennas of all sizes, production quality, and brand name. February 7 of 2010 was a quiet Sunday. High Performance 40 Meters Vertical. Is a Dipole better than a Cobweb Antenna? Ham Radio Aerials. Without Radials. We don't upload Ham Radio Testing The N9sab Ocf Dipole At Qrp Night, We just retail information from other sources & hyperlink to them. BUILD THIS MULTIBAND FAN DIPOLE FOR ALL BAND HF ANTENNA EXCITEMENT Here is a fairly simple and easy to build multi band horizontal fan type dipole that can be constructed for all band operation from 160 meters up thru 6 meters or even higher. Some as low as 20 ohms. Cb wire dipole. Having received some very good advice about the Carolina Windom, I now ask a question to which I THINK I already know the answer. Various installations such as horizontal, vertical, sloper,inverted V etc. Nov 22, 2017 · A Multi-Band 33 Foot Dipole Cecil Moore, W5DXP. Nov 25, 2015 · Introducing the W8AMZ 80–6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. baluns are. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. Background. Feeding the OCF dipole at a point that is one-third of its length from one end, typically yields a higher feed point impedance (approximately 200-300 ohms) compared to the center-fed half wave dipole. of my Ultra-Light 40m OCFD. Can be moved on a pick up roof carrier. 46 foot eighthwave Halfwave Dipole/Vertical is: 25. Customer Review Price: Low to High Price: High to Low Radio Wavz 160m DX(OCF)Windom 266ft. These 10-40M, 10-80M or 10-160M dipoles are ready to be erected right after un-boxing. In this video, "survivalist2008" pays particular attention to the importance of an antenna transmatch to make sure your rig isn't damaged by the high SWRs found on this. 00 *) 160M Antenna, Check this out,KF4BWG Using a Walnut tree as his 2 Meter antenna. 62 m) of Dacron rope. The centre-loaded dipole is a single band antenna most useful when there is insufficient space to erect a full size 1/2-wave dipole so most likely it will be used on the 40m and lower frequency bands. Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. The entire length is supported with a 3/16" dacron rope and outdoor cable ties. BUCKMASTER DX-OCF-160 160 80/75 40 20 17 12 10 6 Meters Off Center Fed Dipole Low SWR 300 Watts Max. Why Is The Dipole So Popular? Because it is an inexpensive, yet effective, antenna, especially if you build it yourself using wire, insulators and rope that you already have in your (or a friend's) "junk box" of spare parts!. 3 4-band 20-17-15-10m COLA -G8ODE iss 1. This morning however I did make a contact to Topeka, KS so I know it gets out. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Not sure what to do about that. in my rear yard, with three 10M radials. It's also ideal for those who want a high performance antenna with world class DX coverage 80, 40, 20, and 10 meters. As mentioned earlier, dipoles have harmonic resonances at odd multiples of their fundamental resonances. Sep 20, 2013 · The 40 Meter off-center fed dipole is in the air and on the air! After some tweaking and tinkering on the antenna and the homemade 4:1 balun, the antenna was raised to around 40 feet between a couple of trees with the assistance of KD4BO and his “spud gun. Dec 20, 2010 · The Worked All Neighbours Award The other weekend Don, VE3MNE, and I built an 80m OCF dipole to replace my current 80m-40m-20m fan dipole. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. But, let's take a look at the current amplitude on those two antenna systems below. (qst, oct 1926, "the length of the hertz antenna" shows in line 2 of the table that a similarly installed random wire should use 423/f. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. EZ 40m monopole used at 20m Low pass network 8-4. Page update of 7 August 2019 Over several decades, Barry Booth (W9UCW) and a group of fellow hams, have done an incredible amount of well-documented and systematic, repeated tests to assess the performance of various. I have a 6m-40m OCF dipole, souldn't I be able to make it a Carolina windom by adding a 1:1 balum 10ft from the end of the feed line? The lengths are roughly the same across the top. A microprocessor controlled battery charger is designed to provide fast, safe and efficient charging to a wide variety of battery types and sizes. The SWR is generally below 1. So I'm no longer using this attic antenna for 80m but it's working great for 40m and above. Apr 25, 2016 · This is part 2, of how to build and use an OCF 80-6 meter Dipole Antenna suitable for portable, emergency, or even for HOA/CC&R-restricted areas. Dipoles, Verticals, Windoms & G5RV for 40 Meters Forty meters is a tremendously popular band with amateur radio operators. Center Frequency: 18. The full-size dipoles are spread out like a fan, hence the name Fan Dipole. The RadioWavz RW-N antenna is designed to provide high-angle radiation NVIS (near vertical incidence skywave) to permit short-range skywave propagation over communication circuits varying from 0 to 300 miles. 6 MHz and you arrive at an overall length of 130'. 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. Kostenlose Lieferung für viele Artikel!. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. That base plate can be placed directly on a flat surface or can be mounted on a tripod (14-20 thread or 3/8 through hole for CHA JAWMOUNT installation). On 40m the half-wave OCFD is 180° long in electrical terms, and. • Frequency coverage 40m (MHz): 7. Support my shows by using my new Amazon store. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. By John Portune W6NBC. Current Amplitude, at 7. for sale is one w2au unidilla antenna center insulator + lightning arrester for hf dipole type antenna. Surprise! They had developed a new antenna, the Carolina Windom® 160 Special that would fit in the same horizontal space that my CW-80 used to fit in. end to end 14awg. Important Note: As with all models of the G5RV antenna, the Optimized version also requires a minimum of 70 feet of 50-52 ohm coax to complete the matching network. Although it is commonly called a Windom it is more properly described as Off-Center-Feed dipole. It is designed for hams on the go. Be sure that the wire that you use is acceptable legally as well as physically. 25 meters ) leg and a 90 foot ( 27. At the new QTH in Natchitoches, Louisiana. If matched properly with the suggested quarter wavelength of 75-ohm transmission line, you should see the following SWR curves. , extreme low or high impedances) at the tuner end, on all bands. Antenna Width: 136ft. AF4OI - Thanks to NAQCC for the well-organized NA sprint. From the archive: 3 element 40m array aiming USA for 6db extra gain (over vertical) From the archive: A3S Tribander (bottom), 40m 2-ele and 80m dipoles From the archive: 15m and 10m fan dipole arrangement test. You have to cut a dipole for resonance on each band (hence the fan dipole - google it). has been producing industry leading RF management products for the communications industry for over 30 years. it's less expensive and more effective. the no-tuner, all-hf-band, horizontal, center-fed antenna is our old friend, the 80 meter. Meetings are open to everyone and all are encouraged to attend. ” The antenna seems to be working well so far. It needs no tuner on 40m, 20m and 10m. This is an End-Fed Half-Wave (EFHW*) antenna for 75/40/30/20/17/15/12 and 10m bands. 3 The FTP cable balun. OCF Antenna 10-40m 1Kw 69ft. It seems to work very well and is very quiet! One question please! Is the diameter of coil former 5. FORMULA(40M(• Using((7. 1500 W QRO Hi Power 9:1 Balun Unun Long Wire Antenna HF Sloper Dipole Ham Radio. 40m Ocf 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. , about ¼ wavelength. The full-size dipoles are spread out like a fan, hence the name Fan Dipole. EZ 40m monopole used at 20m High pass network 8-3-4. I did find the best compromise OCF ratio to be 37% to 63% for the 40M to 6M antenna. If it is a straight dipole, fed with coaxial line, what frequency is it cut for? Or, is it a fan dipole? There is no such thing as a dipole for 40 - 10. Users online: 463 and 259 Guests and Google and Baidu and Bing. This antenna is built to last and provide years of rugged service. 200 MHz (see below for possible settings) • Frequency coverage 30m (MHz): 10. DX OCF Windom 160 by RADIOWAVZ Band width: 160,80m,40m,20m,10m Typically with out a tuner. Meetings are open to everyone and all are encouraged to attend. 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.