The theory of the. 8-m and 27. 9 - A possible 40-meter beam arrangement using quarter-wave folded elements. Watch on. It cover. Do long wires work better than say a standard half wave or quarter wave antenna?Ask an Elmer discusses this very interesting question by one of our viewers. HamSphere is a highly realistic shortwave simulation based on SDR (Software Defined Radio) technology. The AS-2259 Antenna. This has also been the case in Germany. FD4 Antenna - 80-10m 3 el Beam TH3MK4 - 20-10 m Vertical UHF. This link is listed in our web site directory since Friday Mar 10 2017, and till today "How to construct a multi-band dipole using speaker wire" has been. One of the most versatile and inexpensive wire Antenna for 10-80 meter Band. By 1937 the Windom was described “as multi-band antenna that can be employed on harmonically related 160, 80, 40, 20 and 10m bands with acceptable levels of VSWR”. i missed the russian stations!! oq5m: on5zo or6t: oq4u on5xx on4qj or7r: on4lg ot2j: ot2j on6ix on7vg on3daf pa0rsm first time uba contest: pa3cgj not so many time to participate. Its main advantage was that it could easily be matched to a tube transmitter. 5 PL Clovis FD1 Fire Dispatch. pc is a toughbook cf19 wx is quit good,strong winds, 9 xxxx & yyyy are the names of the two participants. The half-size version of the FD4 is known as the FD3 (40,20,10m) and is the subject of this article. VAT, plus shipping €201. Antenna parts category is a curation of 58 web resources on , Sandpiper Aerial Technology LTD, HexKit. Both of these proved toI suggest that new frequencies be promulgated, a few KHZ further away from FT8 on the popular bands , such as 40m, 20m 17m 15m. . You have to use the the S2 port as others have advised. You have tried to build an FD4 antenna which is no bad solution at all. The AS-2259 consists of a pair of crossed dipoles on a common feedpoint. 0: Using (but not overusing) DX Spotting and Making Manual. 00 €. It turns out that 100 feet of line is within about 10% of the idea length to match the antenna to 50 ohms on all amateur bands. H. n Fig 28. Fritz Spillner, DJ2KY, in 1971. post 26 Apr 2023. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. The system has an impedance of 70 - 100 Ohm and for connection. The second gate is directly connected to terminal 13 by removing R210 (10 k). Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. It had the same dimensions as the VS1AA multiband Windom antenna, but fitted with a 300Ω balun at its feed point and-fed over coax. com in a single category. During experiments with for example FD3 and FD4 types, I had noticed that there was a "Windom" point at a length of about 27 m. Tehát amit lent mértem az közel sem az, ami az antenna talppontjában ( a balun alsó végén ) lenne. The FD4 is almost ready, but the weather hasn’t cooperating lately. 6-Band Windom antenna. 156. He is currently only using 100 watts and a FD4 antenna. But for a "real" FD4 the RF transformer should have 4:1 or as some say 2:1 when the height above ground is small. The original Windom antenna (devised in ), named after Loren Windom, W8GZ. (Note the FD3 will also be around 66 feet total length for operating on 7 MHz and. I was using only 30 wtts and FD4 antenna and enjoyed vy much, 73 to all . I suggest that new frequencies be promulgated, a few KHZ further away from FT8 on the popular bands , such as 40m, 20m 17m 15m. Picture courtesy Holger, OX3HI. Ako bi već moralo, onda može biti zgodna kombinacija ukrštenog dipola za 3. DESIGN. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antenna but nobody does receive me. 00 €. Hari Delta Loop antenna for horizontal or vertical suspension, max. See physical description below. , Corvallis, OR . The half-size version is known as the FD3 40-20-10m antenna. 7-m in the. Description: Fritzel FD4 HAM radio multyband HF antenna. i missed the russian stations!! oq5m: on5zo or6t: oq4u on5xx on4qj or7r: on4lg ot2j: ot2j on6ix on7vg on3daf pa0rsm first time uba contest: pa3cgj not so many time to participate. This antenna was developed in Germany, although others likely advanced it also. 110/220 Volts. Fritzel used the shown dimensions of 13. Time Owned: 6 to 12 months. Modified: 11/26/2021. The original Windom antenna from the late 1920s was an off-center fed resonant dipole with a single wire feedline of any length. but it was nice to meet you. The power was also limited to 500 W PA input. In addition, an R6000 has two separate traps for 12 and 17 m, while the 10 and 15 m traps of a. TNX for nice contest. Fritz Spillner, DJ2KY, in 1971. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. The resonance of the antenna at about 15-m height was close to 3. 80,40,20,17,12,10m Seperate parts for balun, isolator, wires. empfangen. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. About The FD4 Windom antenna The resource is currently listed in dxzone. • Radioddity's limited warranty applies to all BRAND NEW items sold by radioddity. Please send me schematics or infos by mail to Thanks in advance. The ClearStream Flex is larger and pricier than the ClearStream Eclipse. 800 Watt FD4 multi-band antenna with 1:4 super balun Project for a multi-band antenna for the 80, 40, 20, 17, 12, 10 and 6 meter bands, including a 1:4 impedance transformer and. Free Shipping. 205 - Collinear Antenna Gain=3dB for 2m. 174 + 0. . DK2CF IC-7400 100Watt Dipole and Delta loop DK4WF FT-890 FD4 Windom 17m high DL7JOM K3 750W LPDA DL7ULM IC706 Indoor-dipole 2 x 11 metres FD4 de chez Fritzel - Antenne. This was a good destruction from my dentistry study on the weekend. 6% 8 m inv. Just wanted to let you know about the success I have had with an antenna project from your web site; 20 Meter "Vertical Zepp Dipole" Antenna by Carl H. Full Member; Hozzászólások: 126; Karma: +73/-2; G7FEK antenna 80 méterre. By serendipity, it also covers the 17 and 2 meter bands. This kind of antenna uses splash plate feed based on ring-focus antenna. I am new to shortwave radio and just thought I'd share my experiences in starting with this hobby. 1971 - Dr. This first video is by a beginner for beginners! In an unc. Fritzel used the shown dimensions of 13. 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. Side kites lifting antenna ends 5. . This has also been the case in Germany. The Fritzel FD4 antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. Fritzel used the shown dimensions of 13. It had the same dimensions as the VS1AA multiband Windom antenna, but fitted with a 300Ω balun in its feedpoint and fed over coax. 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. Once you download and install this software you will get a basic working transceiver for a trial period. Name: Fritzel FD4 HAM radio antenna. Install the game on an SSD. *Note: The FD4 Windom is a 300Ω balun-fed antenna with lres = 41. 36 . 0: Using (but not overusing) DX Spotting and Making Manual Logging Easier. The following plot shows the measured SWR of an FD4 antenna from 3 MHz to 30 MHz with about 20 m of RG58U feeder line. HamSphere 4. 80-10 meter OCF antenna layout. 0, but I wonder how to send WSPR or FT8. I'm using homebrew Windom-Antenna recently. 6-Band Windom antenna - Theory and construction of a novel trapless center-loaded off-center-f. The 4-band Fritzel model FD4 is a special version of a Windom antenna. The store where radio amateurs and specialists buy Everything from one source Fast delivery Excellent support See for yourself!The G5RV has a reasonable SWR on 80, 40, 20, 15, and 12 meters. until the next time frans pa3cgj: pa6nd 102' G5RV standard length antenna with 34' of 3/4" ladder line and a RG8 12" dia, 10 turn coaxial choke, feed by RG8 coax. Most antenna tuners work best into moderate to high impedances, rather than low impedances. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. Fritz Spillner, DJ2KY, in 1971[1]. . 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. 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 experts, view it. Only good results on 80 and 160 meter bands in combination with a MFJ 969 de luxe versa antennatuner. Furthermore, none of these designs offered 30 m. IDK about 160m, i don't have antenna for that and when i look, it's pretty dead. com in 3 categories. << serial ‘ngobrol-‘ngalor-‘ngidul ihwal per-antenna-an bersama bam, ybØko/1 >>. 200 - Inverted-V Beam Antenna for 30m. I've certainly experienced postal theft of my SAE + GS mailings and was only able to secure some difficult to get countries though email discussions and the kind co-operation of the DX stations/ Managers to send me cards at their expense or having them identify a secure route. 55 m dipole fed with a 8. 0 Extras: Using the Editor to Customize Your Transceiver. Belakangan, karena di feed di titik yang melèncèng dari tengah bentangan antenna (OFF-center) seperti yang kemudian umum dilakukan, maka rancangan ante nna macam ini lantas disebut sebagai off-center fed atau OCF antenna. Other projects I would like to to : Build me a G7FEK antenna; Build a end fed half wave 20m vertical. 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. Dahlberg N7AGK. Below 70 Degrees the radiators start to become parallel to each other and signal canceling will start to occur. > I also know about the 6:1 balun but am looking for some info on the > overall length and the point of fed also the angle and height of the > ends of the antenna above ground. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. Anteny SP1BKS - Antenna manufacturer from Poland, produce dipole wire antennas, W3DZZ FD4 Windom and long wires, baluns, dealer for toroids and connectors managed by Leszek Mlynarczyk SP1BKSSubject: 20 meter antenna project. I myself am working with a simple FD4 Antenna. About HF Linked Dipole Antenna Calculator. 0, but I wonder how to send WSPR or FT8. The old Y-Calls had to change in 1992 and I got DL1JBQ. Antena ta zostałą opracowana na użytek wojska przez United States Navy pod koniec lat 40-tych. sierpnia 01, 2015. The Windom - Off Centre Fed Half Wave Dipole Antenna. 8-m and 27. Even if I had the space to put up an HF antenna where I live, the noise floor being a constant S9+20 would make actually using it quite difficult. We discovered in an older periodical (QRV) the explanation by F. Add to Cart Details. 7-m in the. Antenna Multibands Links → . America. The 4-band Fritzel model FD4 is a special version of a Windom antenna. The Standing Wave Ratio (SWR) is the parameter that is easiest for most hams to measure, as meters are very common, both built into many newer radios or as a shack accessory. Most baluns inside antenna tuners step the antenna impedance down. 2350 103. Also, a power amplifier, L4B, is on the way to Baghdad. name xxx qth winterthur near zurich this is my first qso on js8, funny . . 0, but I wonder how to send WSPR or FT8. T. The Fritzel FD4 antenna becomes more popular in Europe and N. This is a pity, because most hams would put up a wire antenna especially for the lower bands where beam antennas are more difficult to erect. 5m (15 foot) mast of about 5cm (2 inch) diameter, that also serves as the outside of a low-loss coax feedline. Hi all, I bought the Mini1300 from China and Software says Version1. COM in Germany because the exchange rate for euros was low. Dat is op de laagste frequentie een draad van een halve golflengte. The 7-band antennas need at least 120 feet of ground space end-to-end. Bonnes bandes passantes en général ,elle est trés efficace en DX et surpasse toute mes autres antennes FB13-FD4-W3EDP de 1 à 2 points S. The Fritzel FD4 antenna becomes more popular in Europe and N. If you make an FD3 or FD4 yourself and use this tuner, you can as well place a 1 ÷ 4 balun with good results. MFJ 1779A 160M Dipole Antennas MFJ-1779A. De opgegeven maten gelden voor geïsoleerd draad. The FD4 (FD3) Windom Antenna. , 4 times) over a simple low dipole are possible • Consider horizontal loop or Lazy H over aOur experts are there to help you in word and deed - independent of the frequency range and radio application. In addition to the wire antennas, in Europe they sell a line of yagis and verticals, and are well respected. The J Pole HANDBOOK 1 of 15 8272007 8:18 AM Serving HAM Radio since 1959, On the Web Since 1995 Order Toll Free Monday through Friday,…Of course this will only help hams/dxpeditioners with net access or credit card accounts. The asymmetrical dipole antenna developed and described by Windom (W8GZ) in 1929 has been used by many amateurs for many years as the FD4. Fritzel used the shown dimensions of 13. It is not an acceptable performer on 30, 17, or 10 meters. Can someone point me to or post the latest Olivia Dial frequencies with 1500 offset? Everywhere I look, I see something different. 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 half-size version is known as the FD3 40-20-10m antenna. 155. “FD4” 4. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. Background. . Belakangan, karena di feed di titik yang melèncèng dari tengah bentangan antenna (OFF-center) seperti yang kemudian umum dilakukan, maka rancangan ante nna macam ini lantas disebut sebagai off-center fed atau OCF antenna. WINDOM. 5m and 2. Both of these proved toNear vertical incidence skywave, or NVIS, is a skywave radio-wave propagation path that provides usable signals in the medium distances range — usually 0–650 km (0–400 miles). Fritzel used the shown dimensions of 13. Item number # 425fd42003. 8-m and 27. A kitelepülés során esténként mindig rádióztunk több-kevesebb sikerrel. 5 mtr RG-58 panjang sebarang ke TX atau ATU 27 mtr Balun 1:6 Di Eropa, rancangan Multiband Windom dengan coax sebagai feeder line yang menonjol adalah rancangan yang dikembangkan oleh Dr. 0 Extras: Using the Editor to Customize Your Transceiver. HamSphere 4. So I checked the frequency and had to adjust it (27MHz calibration)3/20/20 #435. The fundamental ideaWith some very old antennas the traps of radiator and director are equal. This result suggests that sequences outside the C and GMR35H08 elements restrict fd4/fd5 expression to the ventral imaginal discs. 0: We discuss Antennas, DX'ing, Calling CQ, and other Topics. Fritz Spillner, DJ2KY, in 1971. The Fritzel FD-4 was designed by He. I was able to get an excellent deal on a lightly used IC-718 that includes a tuner and power supply. The FD-4 is still made with outstanding quality of materials. Fritz Spillner, DJ2KY di tahun 1971dan diproduksi secara komersiil dengan nama Fritzel. 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. 25 10. Very close to the 300 Ohm impedance of a Windom antenna such as the system used in Fritzel's FD3 and FD4 antennas. 2 and 9. The main category is Dipole antenna that is about Dipole antennas plans. , DJ2KY modified the VS1AA antenna design by replacing the single feed wire with balun and a coax feeder. For a while now I used a 56 meter (184 foot) long horizontal loop, hung up in our back yard. Fritzel used the shown dimensions of 13. Hi all, I bought the Mini1300 from China and Software says Version1. ZS6BKW 's design was based on the original G5RV antenna, a 2 × 15. Fritz Spillner1, DJ2KY, in 1971. S. 45 m 13. 5; 7; 14; 18; 28 MHz-en. Just press the FIX switch the next 500 kHz range is available and a LED light. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. FD4 antenna, fent mérve a kábelhossz beszámításával. The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of VSWR. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. Perhaps the most popular multi-band “Windom” or more accurately, OCFD was the German-made Fritzel FD4 antenna, described by the late Dr. 00. The 4-band Fritzel model FD4 is a special version of a Windom antenna. By 1937 the Windom was described as multi-band antenna that can be employed on harmonically related 160, 80, 40, 20 and 10m bands with acceptable levels of VSWR. The following plot shows the measured SWR of an FD4 antenna from 3 MHz to 30 MHz with about 20 m of RG58U feeder line. EN. As low as: €240. Displaying 1 to 8 (of 8 products) Result Pages: 1. The reason is the larger bandwidth compared to blocking circuit dipoles. WINDOM. More recently, as described in an Appendix to a detailed discussion of Windom-type antennas 'The off-centre-fed dipole revisited: a broad-band, multiband antenna' by Dr John Belrose, VE2CV, and Peter Bouliane, VE3KLO (OST,What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. The 4-band Fritzel model FD4 is a special version of a Windom antenna. Both of these proved toFritzel FD4 antenna, described by the late Dr. Entered for fun between tourist trips to beach with XYL and other things one has to do on holi-day. FD4's are by wide ranges. Various sizes of a ZS6BKW antenna can be found on the Internet, so that the original design of ZS6BKW is often overlooked. pc is a toughbook cf19 wx is quit good,strong winds, 9 xxxx & yyyy are the names of the two participants. Bandwith 150Hz. Here you can see the reports. vy 73 de Ron DG1HVW F4ATM Laurent schrieb: Hello, i need all lenghts of wires and balun type ( 1/6 or 1/4 )to make a Windom antenna 10m to 80m. 52m long ( TT, October 1972 and ART): Fig 5. 453. 1971 - Dr. Description: Fritzel FD4 HAM radio multyband HF antenna. The main category is Dipole antenna that is about Dipole antennas plans. I myself am working with a simple FD4 Antenna. It is a half-wave long on the lowest frequency, and is fed from a coax. 206 - X-Ray Monoband Antenna Gain=6. 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. Comes with an ante. Military AS-2259/GR There are a number of different NVIS antenna plans on the internet that can be adopted to amateur radio use. 5m so chesen that the may not only r t radio Apart the in no other For this they and weather The highlight of this antenna is the balun, 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. Simply. Yeasun FT 857 D. I support the "DX Code Of Conduct" to help to work with each other and not each against the others on the bands. I set mine up as an inverted V, and swr is fine on all bands, but is very low at the bottom ends of 80 and 40. I know this is an old thread - but Hofi in Germany still manufactures the antenna. Fritzel FD4 OCFD (10-80m) 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. Furthermore, none of these designs offered 30 m. 0: We discuss Antennas, DX'ing, Calling CQ, and other Topics. Add a comment. Both of these proved toDe az FD4 nem egysávos antenna és a kábel már korábban felkerült a helyére. The FD4 Windom. Unlike the endogenous expression of the fd4/fd5 genes, the C element is not restricted to the ventral imaginal discs (legs and antenna), as activity of this CRM is also observed in the wing disc. The output looks a bit “interesting” and it could probably use a Band Pass Filter, but the signal is in fact there. The dual dipole wires do the job of providing guying support for the mast. 6m directional antennas with 5, 6 or 7 elements, 1 kW. Also called "OCF", Off Center Fed dipole. 3175 103. Did you try NVIS? Pretty fun here with EFHW-80-10 5 meter high in the. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. SWR is actually better with 300-ohm transmitting line than with the 450 ohm line normally used. That is a wire of half a wavelength on the lowest frequency. The Fritzel FD4 antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. I found some people to call the coax fed antenna with a balun "FD4" - but some other people call FD4 the modification mentioned by Franco IK1OWB (but the measures are doubled: 9. 8 PL Clovis PD1 Police Dispatch. 6 band windom anten 80-40-20-17-12-10m Let's make an antenna so that it is easy, inexpensive, no material problem, working in every band and efficient. If you do the math, it emits about 1. It is my back-up HF antenna, and one that can be used on 40 meter round table rag chews where a beam may not be ideal. FD-4 antenna 3. Operating HamSphere 4. 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. hofi de) . My dipoles and long wires had so much noise that I hardly ever would listen to HF. (35' on 75M. 0 29. Since it is resonant on multiple bands the signal level at the receiver is high. 4 (MHz)Fritzel FD4 antenna, described by the late Dr. VAT, plus shipping €63. Republic of Germany 4, 04450 Federal Republic of Germany (26. 73, Ray K1XV . Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. Unlike the endogenous expression of the fd4/fd5 genes, the C element is not restricted to the ventral imaginal discs (legs and antenna), as activity of this CRM is also observed in the wing disc. 0m and lshort = 13. The wire tails connecting to the Balun Bolts are just ordinary Philips Spades. 7-m in the 1960s. Len Carlson, K4IWL. Fritzel Antenna Source? 7. In stock, shipped in 1 to 2 days. En FD4 er en glimrende antenne, opsat inverted vil du opnå en lavere udstrålingsvinkel, altså bedre til DX. I was amazed what DX I worked from this antenna and QRP andUniversity merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. I know this is an old thread - but Hofi in Germany still manufactures the antenna. The Windom - Off Centre Fed Half Wave Dipole Antenna EN English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian český русский български العربية Unknown RUMORS OF THIS ANTENNAS DEATH ARE GREATLY EXAGGERATED Time Owned: 0 to 3 months. 6 dB less power than the center-fed. 7-m in the 1960s. 8-m and 27. > antenna is no longer made. Monitoring from 93619, on a Uniden BC125AT scanner on AC power (battery backup), paired with an exterior custom j-pole antenna. 3 m dia loop and E field antenna, 2. The dimensions were the same as the multi-band Windom antenna, but fitted with a 200Ω (4:1) balun at its feed point and fed with 50 ohm coax at lower heights above the ground. The performance characteristics are quite outstanding. It had the same dimensions as the multiband Windom antenna, but fitted with a 200Ω (4:1) balun at its feedpoint and fed with coax. The garden is about 6 by 30m, just big enough to fit a FD4 antenna. 0 Extras: Using the Editor to Customize Your Transceiver. The antenna was designed for military use from 2 to 10 MHz (some references say 2 to 30 MHz). . That means about 500 W/CW and 1 KW/CW, SSB transmit power. 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. 2 and 9. 03. FD4S-B288S00JDB2. « u: 31. Spillner (DJ2KY) that this antenna, with the addition of a small one-band Windom for 15 m, can. power 1 kW, approx. > To: <[email protected] in the 1960s. Here is my home HF antenna. The AS-2259 consists of a pair of crossed dipoles on a common feedpoint. I live in a suburb. 5 i 7 MHz i neke multiband vertikalne antene za gornje opsege. There is an amateur antenna out there consisting of an 80-meter dipole (I mean one that is a half wave at 80 meters, not one physically 80 meters long) fed with about 100 feet of 450 ohm ladder line. It kind of works for 160, 80 and 40 meter. HamSphere 4. Main tether 6. 6 288 29. He will operate on 40, 30, 20m, including activity in CQ WW WPX CW Contest. Hari Wire Groundplane Antennas. The dimensions were the same as the multi-band Windom antenna, but fitted with a 200Ω (4:1) balun at its feed point and fed with 50 ohm coax at lower heights above the ground. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. This trademark application was filed with the USPTO (United States Patent and Trademark Office) under the trademark classification: Computer Product, Electrical &. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in. America. The dimensions were the same as the multi-band Windom antenna, but fitted with a 200Ω (4:1) balun at its feed point and fed with 50 ohm coax at lower heights above the ground. 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. 4+4. Vy. . VU2NSB OmniDX antenna (11m) VU2NSB OmniDX Antenna series is a very s. What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4. Ashok Use your search engine to find 'FD3 antenna' and 'FD4 antenna' - I see many hits. HamSphere 4. After the wall came down I got my own station with an old FT-277B with FD4 antenna. As low as: €75. com. 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. By the way, a German ham told me that Herr Fritzel, the company founder, passed away recently. It was designed to cover 80, 40, 20 15, and 10 meters. com in 2 categories. The Fritzel FD4 antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Mivel az antennaszálak kimérését közel se tudtam azzal a precizitással elvégezni, mint a balun és a trafó elkészítését, nem lepett meg az első mérés eredménye. This video provides background on what many of us believe to be the greatest off-center-fed dipole antenna ever created. Free Shipping. North America. . It is an off centre fed dipole, with 10 feet of vertical radiator. It covers 7 bands, 10-12-15-17-20-40-80m. If the installation site permits, a dipole antenna in a vertical "Vee" configuration has radiation patterns suitable for NVIS applications -- and can have useful low-angle radiation, as well. So far received 3. The Off-Center-Fed-Dipole – also called a “Windom” by many companies selling them – has a somewhat blemished reputation amongst amateur radio operators. BEST COMPACT: Antennas Direct ClearStream 4V Long-Range TV Antenna. 1. -V 80. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antennaadding two wires to the basic FD4, 4. But for a "real" FD4 the RF transformer should have 4:1 or as some say 2:1 when the height above ground is. OK2SWD. The half-size version is known as the FD3 40-20-10m antenna. Rating & Comments (0) Tags (7) Alternate Versions.