Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. 3V microcontroller or a 5V microcontroller but it should have an SPI port. What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. jpg (228. Versi Dr. 7 Mllz arc available if the high fre- quency is directly coupled out. 2004-02-19. WINDOM. The R-7000 is a good antenna as far as verticals go, but it needs. 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. Hi all, I bought the Mini1300 from China and Software says Version1. 205 - Collinear Antenna Gain=3dB for 2m. This split allows the OCFD to be operated as a 4 band antenna as the SWR on the 40m band is less than 3. Fritz Spillner1, DJ2KY, in 1971. The VSWR bandwidth is as advertised. Stay safe with that monster antenna!try other time, like morning and evening when people are on their stations actively clicking CQs, not just JTDXing automatically for the priziest QSO. 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. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. Fritzel used the shown dimensions of 13. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. 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. Then cut the 50-Ω feed line at a multiple of an electrical half-wavelength (at 3. Now, how was a Windom antenna developed? It began with a center-fed, half-wave dipole. 5; 7; 14; 18; 28 MHz-en. • Radioddity's limited warranty applies to all BRAND NEW items sold by radioddity. This trademark application was filed with the USPTO (United States Patent and Trademark Office) under the trademark classification: Computer Product, Electrical & Scientific. The FD4 antenna for 20/40/80 had a lot of interference on 80 that we could not trace to a source in the building. 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. 200 - Inverted-V Beam Antenna for 30m. A shorter version FD3 for 40-10m operation is also developed. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. For the PAL8010OCF,. Operating HamSphere 4. The equipment is an RFzero directly into a 1:9 UNUN. 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. power 1 kW, approx. balun, incl. I asked my landlord for the possibility to fix one end of it on his house. A shorter version FD3 for 40-10m operation is also developed. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. Fritz Spillner, DJ2KY, in 1971. I know this is an old thread - but Hofi in Germany still manufactures the antenna. that's not what I'm trying to explain. 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. Fritzel used the shown dimensions of 13. and "bout 15 MHz if matching is SWR Window on the following antenna 'g Of 41. 8-m and 27. Len Carlson, K4IWL. FD4 antena ima problem sa napajanjem. 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. 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. Napravio bih multiband Windom antenu. The base sat on the tile floor. Hi all, I bought the Mini1300 from China and Software says Version1. It cover. You are stuck at 5W max, so you need really good. 36 . > To: <ARRL-LOTW@. So I checked the frequency and had to adjust it (27MHz calibration)3/20/20 #435. Baldur Drobnica is using 100W on the HF bands with an FD4 antenna. 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. 5 PL Clovis FD1 Fire Dispatch. 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. 5 and 28 Mhz. For the PAL-OCF8010 with 250 feet of RG213 feed line and an average height of 30 feet: Palomar Engineers PAL-OCF8010 Antenna manual 05242021 29. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. I live in a suburb. Add to Cart Details. It is a half-wave long on the lowest frequency, and is fed from a coax. 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. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. 3 MHz. I improved my setup with a FT920, 3 el Monobander for 10m and made Packet Radio in 1997. 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”. 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 Stealth Multiband Vertical A vertical antenna for 40 and 80 meters band, using a telescoping. Since it is resonant on multiple bands the signal level at the receiver is high. 0, but I wonder how to send WSPR or FT8. be. America. Hi all, I bought the Mini1300 from China and Software says Version1. En FD4 er en glimrende antenne, opsat inverted vil du opnå en lavere udstrålingsvinkel, altså bedre til DX. antenna systems are easily carried and installed by two people in less than 15 minutes. Name: Fritzel FD4 HAM radio antenna. It is a long half wave on the lowest frequency and is powered by a coaxial cable through a transformer inserted in the wire to a third from one end. 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. 0, but I wonder how to send WSPR or FT8. Don't hesitate - contact us. Available in: Asia. 1971 - Dr. Please select a product. The G5RV has a reasonable SWR on 80, 40, 20, 15, and 12 meters. Topic: Dipol - FD3 - FD4 (Read 3108 times) 0 Members and 1 Guest are viewing this topic. Main "coax lifter kites 2. 5-8800 MHz) CHARACTERISTICSname xxx qth winterthur near zurich this is my first qso on js8, funny . With the RigExpert antenna analyzers, the process of tuning directional antenna is simple and easy. . Fritzel used the shown dimensions of 13. The 4-band Fritzel model FD4 is a special version of a Windom antenna. I0JXX 432 MHz Yagi antennas. 7-m in the 1960s. The half-size version is known as the FD3 40-20-10m antenna. -V 80. S. The antenna is very well made and was received with all the parts required for a very easy and fast assembly. I made contacts. 7-m in the 1960s. 52m long ( TT, October 1972 and ART): Fig 5. com. WINDOM. 55 m dipole fed with a 8. antenna. The FD-4 is still made with outstanding quality of. 7. 9 - A possible 40-meter beam arrangement using quarter-wave folded elements. About Windom Antenna with 4:1 balun The resource is currently listed in dxzone. About HF Linked Dipole Antenna Calculator. Military AS-2259/GR There are a number of different NVIS antenna plans on the internet that can be adopted to amateur radio use. The plot shows the current distribution on a 42 m long FD4 Windom antenna for the frequencies 80, 40, 20, 17 and 10 m. . The performance characteristics are quite outstanding. Az FD4 antennámon a következő lépés az antenna mérése, kihasználva a VNWA lehetőségeit. America. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antenna adding two wires to the basic FD4, 4. 7-m in the. Watch on. I m stuck It is possible to get into a location where you can moveUniversity merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. in JO62PL. So I checked the frequency and had to adjust it (27MHz calibration)I'm just afraid that if we install a PayPal box at the LoTW page, paying can become mandatory before QSL-ing. The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of VSWR. I still young so I thinks this is normal, didn't we all start small. but nobody does receive me. Operating HamSphere 4. The circuit diagram shows how the module should be interfaced with a. 8-m and 27. Fritzel used the shown dimensions of 13. Ashok Use your search engine to find 'FD3 antenna' and 'FD4 antenna' - I see many hits. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. Here I have an FD4 Windom antenna running down the garden, this is an 80 metre dipole but fed offset (about 1/3rd of the way along it’s length) with a step down Balun to match the 50 ohm coax and has a fairly low SWR on 80, 40, 20 and 10 metres. “FD4” 4. 8-m and 27. ANTENNAS. T2FD. Time Owned: 6 to 12 months. The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of VSWR. What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. The Fritzel FD4 antenna becomes more popular in Europe and N. 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. The resource is currently listed in dxzone. The problem is, that I have land in the valley, or rather only in such a valley, but I can't get over the hills even with a pole. Short Antenna Windom 160 - 80 meters: THE FD4 (FD3) windom antenna, PA0FRI: The FD4 Windom: The New Carolina Windom: The Windom Antenna Off Center Feed: Una Windom per gli 80, 40, 20 e 15 mt, IZ1TQI: Un toroide per la windom, IK0RKS: Variation on the Windom: Windom antenna, I6QON: WINDOM antenna 160/80/40/20/10 metri, I6IBE:. incl. If you do the math, it emits about 1. This antenna was developed in Germany, although others likely advanced it also. So here at my home there is also room for improvement. Homemade Carolina Windom antenna. All groups and messages. While most of the antennas were made by "name" manufacturers, the Gesobyte and the Btfdreem were chosen specifically. So. 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. 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. While the G5RV requires an antenna tuner, it is very efficient on at least 5 bands. A shorter version FD3 for 40-10m operation is also developed. Rated 5 out of 5 stars. Fritzel used the shown dimensions of 13. ic7800 @ 100w microkeyer ii - heil proset elite - cushcraft r6000 and fd4 antennas - n1mm logger. . 0, but I wonder how to send WSPR or FT8. America. For a while now I used a 56 meter (184 foot) long horizontal loop, hung up in our back yard. Latin America. Furthermore, none of these designs offered 30 m. OCF, FD4, FD3 (WINDOM) ANTENNE Met foto's, tekst en tekeningen. 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. 8-m and 27. The antenna consists of asymmetrical length horizontal. Searching for Fritzel Windom (Fritzel in business?) 4. 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. FD4 Antenna switched as T-Antenna, Datong Konverter up to 28 MHz, Kenwood TS 480 for receive, using CW. It was intended to be used on one frequency only. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. 1st xmission 15 dB above city noise level, 2ns xmission abt 10 dB. Guest. From time to time OZ0RF is active from Copenhagen in JO65FR. Add to Cart. And the length of the legs must match. 00 €. Topic: Dipol - FD3 - FD4 (Read 3275 times) 0 Members and 1 Guest are viewing this topic. Also called "OCF", Off Center Fed dipole. 206 - X-Ray Monoband Antenna Gain=6. I have FT-891 and when i try on my FD4 antenna with 5W, i sometimes need more attempts at TX, so i spice it up to 20W to push it through. The Fritzel FD4 antenna becomes more popular in Europe and N. 0, but I wonder how to send WSPR or FT8. FS: Fritzel Windom Type antenna. 2 and 9. Rather than feeding the conventional 33%/67% we like the 29%/71% feed point wherein the feed point is 21% from one end and fed with a 4:1 OCF Current balun with built in feed line choke1971 - Dr. Configure & Download. 0 Extras: Using the Editor to Customize Your Transceiver. 5 i 7 MHz i neke multiband vertikalne antene za gornje opsege. First trim the dipole for resonance at about 3. Allows you to more easily get the antenna up high and outside. The Fritzel FD-4 was designed by He. This garbage disposer offers a simple, efficient, and economical way to dispose of food waste in restaurants, hotels, or hospitals serving up to 1000 meals per day, or cafeterias, commissaries, or schools. This has also been the case in Germany. This result suggests that sequences outside the C and GMR35H08 elements restrict fd4/fd5 expression to the ventral imaginal discs. $99. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. BEST COMPACT: Antennas Direct ClearStream 4V Long-Range TV Antenna. Je li netko možda stavljao napajanje na neko drugo mjesto jer sam na internetu našao i drugačije omjere. WINDOM. Most Popular. Sark100 antenna analizátor. Ožujak 2004, 14:46:50 ». An asymmetric dipole OCF is a non-grounded dipole antenna fed by a two-wire line, either a coaxial or a parallel conductor with an open wire. I know this is an old thread - but Hofi in Germany still manufactures the antenna. also works on the 80 and 160 meter band. 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. 5m (15 foot) mast of about 5cm (2 inch) diameter, that also serves as the outside of a low-loss coax feedline. But for a "real" FD4 the RF transformer should have 4:1 or as some say 2:1 when the height above ground is. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. 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”. Furthermore, none of these designs offered 30 m. 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 resource is currently listed in dxzone. 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. Added: 07/18/2019. Fritz Spillner, DJ2KY, in 1971. Mire jó még a Smith diagram segítségével mért eredmény? Ha ez pl. VAT, plus shipping €201. 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. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer. Didn't think of the postal theft situation in many countries. Properly and efficiently dispose of your establishment's food waste with the Hobart FD4/200-2 commercial garbage disposer with adjustable flanged feet. 1971 - Dr. Multiband FD-4 Windom antena. Conclusion: The ON4BAA-300 Windom achieves a lower VSWR than the traditional FD4 Windom on the 80, 30 and 15m bands by feeding the antenna closer to one wire end than usual. 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. Both of these proved toA special form of a Windom antenna is a FD4 from Fritzel. As low as: €240. 80-10 meter OCF antenna layout. Modified: 11/26/2021. One of the most versatile and inexpensive wire Antenna for 10-80 meter Band. 52m long ( TT, October 1972 and ART): Fig 5. 7-m in the. It comes complete with a 1:6 balun with SO-239 connector. Good Signal 15 dB above noise. rig is a codan 2110v 25w fd4 antenna 15ft above ground yyyy, ur station is amazing! do u qsl js8. Hari Wire Groundplane Antennas. 00. Een bijzondere vorm van een Windom antenne is een FD4 van Fritzel. 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. 80,40,20,17,12,10m Seperate parts for balun, isolator, wires. Furthermore, none of these designs offered 30 m. Hi all, I bought the Mini1300 from China and Software says Version1. The Fritzel FD4 antenna becomes more popular in Europe and N. The main category is Dipole antenna that is about Dipole antennas plans. I was using only 30 wtts and FD4 antenna and enjoyed vy much, 73 to all . 4 (MHz)Fritzel FD4 antenna, described by the late Dr. In addition, an R6000 has two separate traps for 12 and 17 m, while the 10 and 15 m traps of a. The main category is Windom antenna that is about Windom antenna links. In the total length of this antenna is 41m, height is about 11m, and diameter of element is 2mm. The original Windom antenna from the late 1920s was an off-center fed resonant dipole with a single wire feedline of any length. isolators. The FD4 Windom. Regardless of how high the antenna is, a roof, especially a metal roof, will have a negative effect on the antenna pattern if the roof is 1/8 wavelength away or closer. antenna systems are easily carried and installed by two people in less than 15 minutes. RF-1936/38 Portable Crossed-Pole Antenna Series MECHANICAL RF Connector Side feed with wing nut. 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. Balun C. 8-m and 27. 0: We discuss Antennas, DX'ing, Calling CQ, and other Topics. empfangen. The FD4 (FD3) Windom Antenna. 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. In addition to the wire antennas, in Europe they sell a line of yagis and verticals, and are well respected. 5m. 5. WINDOM. The ClearStream Flex is larger and pricier than the ClearStream Eclipse. To: n4ujw@hamuniverse. Watch on. Side kites lifting antenna ends 5. The FD4 Windom antenna. 4:1 on the 20,15,10m bands Graphics by G8ODE June 2012 iss 1. 0 Extras: Using the Editor to Customize Your Transceiver. Only good results on 80 and 160 meter bands in combination with a MFJ 969 de luxe versa antennatuner. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. 1x Radioddity RA-FD4 8. Most baluns inside antenna tuners step the antenna impedance down. Part Number: MFJ-1779A. 2017-10-16. 73 de Raimund DH8RD in JO44PE. Fritz Spillner, DJ2KY, in 1971[1]. While the G5RV requires an antenna tuner, it is very efficient on at least 5 bands. 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. For best results with this type of antenna, the Apex Angle should be kept between 70 and 110 Degrees . Coaxial Cable P R O D U C T S P E C I F I C A T I O N LDF4-50A Standard coaxial cable, 1/2", 50 ohm foam HELIAX (Wideband from 0. popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. 00 €. The FD4 (FD3) Windom Antenna The 4-band Fritzel model FD4 is a special version of a Windom antenna. 3. e. Systems FCC-4 half-wave dipole antenna, also know as the reference dipole antenna, is the simplest form of an antenna. This Windom antenna was marketed in the late 70's and early 80's as Smithe's Windom. 4-5 meter. OZ0RF. We discovered in an. What became perhaps the most popular multiband Windom design of all, was the German-made Fritzel FD4 antenna, described by the late Dr. Fritzel FD 4 Multiband Antenna Reviews Home Reviews For: Fritzel FD 4 Multiband Antenna Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered. So far no one has rated yet, so be the first to rate. 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. . 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. com and TCSWAT web page. ' IS (MHz) so. hello, 13,5m; 27,5M and a 1:6 balun. Perhaps the most popular multi-band “Windom” or more accurately, OCFD was the German-made Fritzel FD4 antenna, described by the late Dr. 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. The Fritzel FD4 antenna is a classical antenna in our series of HS4 Legendary Multiband Wire Antennas. Add to Cart. DJ2KY di tahun 1971dan diproduksi secara komersiil dengan nama Fritzel FD4 antenna. Success, after several years, I finally manage to get out of the block of flats and into a family home, and I would like to replace CB with something more interesting, e. 26 Inch High Gain Antenna (Original Baofeng GT-3/GT-3TP Antenna) 1 Year and 6 months Manufacturer's Warranty. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. 3 dB gain, incl. EN. . 1. University merilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. Vertical antennas made of steel wire, monoband or multiband, with balun and radials. HamSphere is a highly realistic shortwave simulation based on SDR (Software Defined Radio) technology. The antenna was designed for military use from 2 to 10 MHz (some references say 2 to 30 MHz). Fritzel FD4 OCF Dipole. 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. Mike has also erected a 20m high vertical for 80 and 160 meters and a 8 element LP for 20-10 meters. A weekend with good DX in morse After the frustration with Uganda in morse I switched to chasing different countries and propagation was good in the weekend. 2350 103. Great multi-band antenna, I have the FD-4 Fritzel this is the only antenna that I have and it allows me to work 80/40/20/17/12/10 and I use it on 15 and 60 meters with the internal tuner in my 940. 1971 - Dr. The 4-band Fritzel model FD4 is a special version of a Windom antenna. 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. This encompasses not only long-wire antennas, but also the classic dipole. #1 Trademark Search and Registration Service :: TUNNEL VOICE FD4 is a trademark and brand of Tunnel Radio of America, Inc. This link is listed in our web site directory since Tuesday Jul 22 2008, and till today "The FD4 Windom antenna" has been followed for a total of 3736 times. THE OCF FD4 (FD3) WINDOM ANTENNA 19 may 2011. By serendipity, it also covers the 17 and 2 meter bands. Just need an antenna. 0, but I wonder how to send WSPR or FT8. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. EN. Fritzel FD4 antenna, described by the late Dr. The Fritzel FD4 antenna becomes more popular in Europe and N. It comes complete with a 1:6 balun with. 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. 3175 103. TA4AU. As at the way things are now all that will happen is Olivia will get a number of FT8 stations annoyed. This trademark application was filed with the USPTO (United States Patent and Trademark Office) under the trademark classification: Computer Product, Electrical &. Our new portable Dipole antenna set with mounting kit.