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. ----- Original Message ----- From: "Gerry Hohn" <telwest@. ASUS AX3000 Dual Band PCI-E WiFi 6 (802. The main category is Dipole antenna that is about Dipole antennas plans. I'm just afraid that if we install a PayPal box at the LoTW page, paying can become mandatory before QSL-ing. Az első napon a városban Vadászati és Halászati kiállítás volt. 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. I am new to shortwave radio and just thought I'd share my experiences in starting with this hobby. A FD4 multiband HF Antenna B. 26 Inch High Gain Antenna (Original Baofeng GT-3/GT-3TP Antenna) 1 Year and 6 months Manufacturer's Warranty. za 80m L je 41m. FD4's are by wide ranges. 1971 - Dr. My dipoles and long wires had so much noise that I hardly ever would listen to HF. 00 €. 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. However, two problems remained: The next section explains why traditional OCF dipoles have these inherent lim-itations. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. The half-size version is known as the FD3 40-20-10m antenna. The 4-band Fritzel model FD4 is a special version of a Windom antenna. FD4 antenna, fent mérve a kábelhossz beszámításával. *Note: The FD4 Windom is a 300Ω balun-fed antenna with lres = 41. 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. Slavek carried the Icom IC-706 in aluminium case together with antenna tuner, paddle, computer, FD4 antenna with 20 metres of coaxial cable and a power. The Carolina Windom is described in (Straw 2007) who attributes it to Edgar Lambert (WA4LVB), Joe Wright (W4UEB), and Jim Wilkie (WY4R) who published a variation on the ‘original' Windom. 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. 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 half-size version is known as the FD3 40-20-10m antenna. Produce baluns, delta loops, dipoles, ocf antennas and more. Picture courtesy Holger, OX3HI. The FD4 (FD3) Windom Antenna. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian česk. This result suggests that sequences outside the C and GMR35H08 elements restrict fd4/fd5 expression to the ventral imaginal discs. 52m long ( TT, October 1972 and ART): Fig 5. A Portable NVIS Antenna is QRP-Friendly. com in a single category. 460. The 4-band Fritzel model FD4 is a special version of a Windom antenna. 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. 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. 3175 103. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. By the end of the 70's interest in the Windom ----- Original Message ----- From: "Gerry Hohn" <telwest@. 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 Longwire antenna basics basic notes on building longwire antennas for medium waves 6-Band Windom antenna The FD4 (FD3) Windom Antenna - The 4-band Fritzel model FD4 is a special version of a Windom antenna. H. I was able to get an excellent deal on a lightly used IC-718 that includes a tuner and power supply. Find many great new & used options and get the best deals for PAC Aai-fd4 Rear-seat AUX Input for Select Ford Lincoln Mercury 2004 - 2010 at the best online prices at eBay! Free shipping for many products!. 1750 114. About The FD4 Windom antenna The resource is currently listed in dxzone. 7-m in the 1960s. . 80-10 meter OCF antenna layout. WINDOM. 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. I still young so I thinks this is normal, didn't we all start small. I built it using 3/4 inch copper pipe with rg-8 running up the center. Also called "OCF", Off Center Fed dipole. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. 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. I know this is an old thread - but Hofi in Germany still manufactures the antenna. com The 4-band Fritzel model FD4 is a special version of a Windom antenna. 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. 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. 5. . The second gate is directly connected to terminal 13 by removing R210 (10 k). The diagram gives no guidance on key implementation details such as height, and the nature of the common mode. -V 80. COM in Germany because the exchange rate for euros was low. This kind of antenna uses splash plate feed based on ring-focus antenna. Rating & Comments (0) Tags (7) Alternate Versions. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. e. 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. FD4 antenna, lent a kábel végén mérve. 7-m in the. Whereas the FD4 being really an 80 metre dipole has lots of lobes and becomes almost. egy egysávos antenna lenne és az Ohmos összetevő 50 Ohm környékén lenne akkor ha induktív reaktanciát mérünk, akkor egy azzal egyenértékű reaktív. Een bijzondere vorm van een Windom antenne is een FD4 van Fritzel. MFJ 1779A 160M Dipole Antennas MFJ-1779A. Now, how was a Windom antenna developed? It began with a center-fed, half-wave dipole. A shorter version FD3 for 40-10m operation is also developed. Fritz Spillner, DJ2KY, in 1971. A shorter version FD3 for 40-10m operation is also developed. De antenne wordt op eenderde van zijn lengte gevoed met een geschikte HF transformator en coaxkabel. 249. In the total length of this antenna is 41m, height is about 11m, and diameter of element is 2mm. The Windom - Off Centre Fed Half Wave Dipole Antenna. DX Code Of Conduct. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in. 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,secure the ends, the 4-Band antennas need at least 60 feet of ground space from end-to-end. It covers 7 bands, 10-12-15-17-20-40-80m. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. 47 kB, 1280x1024 -. 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. Sark100 antenna analizátor. 52m long ( TT, October 1972 and ART): Fig 5. The. A shorter version FD3 for 40-10m operation is also developed. 50 m 32. com. As at the way things are now all that will happen is Olivia will get a number of FT8 stations annoyed. Fritz Spillner, DJ2KY di tahun 1971dan diproduksi secara komersiil dengan nama Fritzel. 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. Este diseño también presenta unos bigotes de gato para trabajar las bandas WARC y los 15m. Hi all, I bought the Mini1300 from China and Software says Version1. It is not an acceptable performer on 30, 17, or 10 meters. RF-1936/38 Portable Crossed-Pole Antenna Series MECHANICAL RF Connector Side feed with wing nut. 00 €. By the end of the 70's interest in the Windom. I was using only 30 wtts and FD4 antenna and enjoyed vy much, 73 to all . OCF, FD4, FD3 (WINDOM) ANTENNE Met foto's, tekst en tekeningen. 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. Dat is op de laagste frequentie een draad van een halve golflengte. Add To Cart. g. 5 PL Clovis FD1 Fire Dispatch. 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 a current balun handling 800 Watt with common mode attenuation up to 40 dB! Complete balun and 1:4 impedance transformer See full list on iw5edi. 3 MHz. The Fritzel FD4 antenna becomes more popular in Europe and N. Fritz Spillner, DJ2KY, in 1971[1]. HamSphere 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 small. Just need an antenna. A kada ima problema sa napajanjem, onda su problemi sa komšijama verovatni . 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. > To: <ARRL-LOTW@. RF-1936/38 Portable Crossed-Pole Antenna Series MECHANICAL RF Connector Side feed with wing nut. If the insulator has been exposed to our climate for some time, the resin "evaporates" on the surface. 203 - Three Elements Wire Yagi for 10m. 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. Fritz Spillner, DJ2KY, in 1971. De opgegeven maten gelden voor geïsoleerd draad. At present some Czech amateurs call it "PA0FRI" antenna. Hari Delta Loop antenna for horizontal or vertical suspension, max. I have it mounted flattop up about 45 feet. 00. WINDOM. Add to Cart Details. HamSphere 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. By serendipity, it also covers the 17 and 2 meter bands. . > To: <[email protected] in the 1960s. On 40m, 20m and 10m it works nicely, as one would expect for this type of antenna. . This has also been the case in Germany. The Windom (also called "OCF", Off Center Fed) antenna is one of the most popular wire antennas for radio amateurs. K1POO 4 Band Off Centre Fed Dipole (40-20-15-10m ) To demonstrate the accuracy of the MMANA-GAL model of the K1POO antenna, the results from the MMANA-GAL program and Rob’s (M0RZF) Vector Network Analysis are shown below. This antenna also works fairly well on all odd harmonics,The asymmetrical dipole antenna developed and described by Windom (W8GZ) in 1929 has been used by many amateurs for many years as the FD4. So I checked the frequency and had to adjust it (27MHz calibration) But still. 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. 3. Fritzel used the shown dimensions of 13. 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. . Latin America. I have connected the N connector to a tuned antenna in my yard and then received that signal via another antenna to my ic-7610 and was able to decode it okay. The garden is about 6 by 30m, just big enough to fit a FD4 antenna. America. 1. 200 - Inverted-V Beam Antenna for 30m. A 1 ÷ 6 auto transformer matched the antenna to the 60-On one occasion when the steward helped Vasek put his luggage up in the board case, she strictly refused the suitcase above any person and Vasek had to move with it the tail of the aircraft. The antenna rotor needed some tries to get moving again. The main category is Dipole antenna that is about Dipole antennas plans. EN. Hi all, I bought the Mini1300 from China and Software says Version1. 52m long ( TT, October 1972 and ART): Fig 5. The ClearStream Flex is larger and pricier than the ClearStream Eclipse. The FD-4 is still made with outstanding quality of materials. extend the basic antenna (FD4) to its full length. Also: Someone asked if there was any usefulness of FT8. 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 AS-2259 Antenna. Las medidas indicadas entre paréntesis, en el gráfico de la izquierda, son las indicadas para trabajar las bandas desde 160m a 10m. While most of the antennas were made by "name" manufacturers, the Gesobyte and the Btfdreem were chosen specifically. 2. 38m) split. Napravio bih multiband Windom antenu. I did follow the instructions and entered my Call and Locator, selected port S1 and connected FD4 antenna but nobody does receive me. Szerző Téma: G7FEK antenna 80 méterre (Megtekintve 3197 alkalommal) hg0npj. 55 m dipole fed with a 8. but it was nice to meet you. Also watched the livestream on Youtube Looking forward fo christmas this year. Any hints? Thank you. Elsewhere in Africa, David, VE7VR is active as A25VR from Botswana until 3 June. 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. As low as: €75. 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. It kind of works for 160, 80 and 40 meter. Sometimes, all you can use for 40 m field work is a low-slung portable dipole antenna. com. The antenna was clipped to the RTL-SDR V3 antenna base without the telescoping whip – alligator clipped to the threaded mast. Fritz Spillner1, DJ2KY, in 1971. Furthermore, none of these designs offered 30 m. 69 at Amazon. 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. n Fig 28. 6m is also dead, useable only for experiments and local contacts here. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. 1971 - Dr. Len Carlson, K4IWL. Baldur Drobnica is using 100W on the HF bands with an FD4 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. A Double Windom Antenna for Eight This which originally appeared as two articles in cq-DL, was translated from the German by Dr. The antenna consists of asymmetrical length horizontal. The Windom - Off Centre Fed Half Wave Dipole Antenna. 00. But it was over water, the villa pool hi. The Fritzel FD 3 HF Antenna,is a great antenna! He is made for the 10-20-40 meter bands,and wil. 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 FD4 antenna, described by the late Dr. The Fritzel FD4 antenna becomes more popular in Europe and N. . 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. WINDOM. 156. Windom antennas for shortwave, with 1:6 balun and isolators, 200 or 1000 W. ( 3 ) Estimated Ship Date: Monday 11/20/2023. The Fritzel FD4 antenna becomes more popular in Europe and N. Fritzel used the shown dimensions of 13. post 24 Dec 2021. The fundamental ideaWith some very old antennas the traps of radiator and director are equal. At least the antenna seems working during the February NAC 23cm contest. Also, a power amplifier, L4B, is on the way to Baghdad. In addition, an R6000 has two separate traps for 12 and 17 m, while the 10 and 15 m traps of a. 1x Radioddity RA-FD4 8. My maximal lenght for the 2/3 wire is 24m maxi, i have no mutch place in my little garden. The OX3HI WSPR transmitter with 20×4 LCD. Don't hesitate - contact us. empfangen. . I recently purchased the 5KW FD4 from an MWF-SERVICE. America. 7. The graphic below shows its performance on the 40/80/160m bands for the conditions shown there. Republic of Germany 4, 04450 Federal Republic of Germany (26. The asymmetrical dipole antenna developed and described by Windom (W8GZ) in 1929 has been used by many amateurs for many years as the FD4. It covers 7 bands, 10-12-15-17-20. 154. The Fritzel FD-4 was designed by He. com Hex Beam Base Plates, Mastrant. WINDOM. Hi all, I bought the Mini1300 from China and Software says Version1. Antenna Maxiwhip vs Antenna Windom FD4 - RX test 80mmerilis tulisan tentang cara menala half -wave antenna dengan pengumpanan lewat single wire ini. 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. Today, many radio amateurs are using multiband Windom antennas with more thanTHE 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. az FD4-emnél is szarabb. On al the bands a SWR of 1:1!!! The FD4 (FD3) Windom Antenna The 4-band Fritzel model FD4 is a special version of a Windom antenna. 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. Hari Delta Loop antenna for horizontal or vertical suspension, max. See It. 0: Using (but not overusing) DX Spotting and Making Manual. SWR is actually better with 300-ohm transmitting line than with the 450 ohm line normally used. Operating HamSphere 4. • Radioddity's limited warranty applies to all BRAND NEW items sold by radioddity. Baldur Drobnica will be active from Hargeisa, Somalia until 6 June 2018, as 6O0X. Fritz Spillner1, DJ2KY, in 1971. Install the game on an SSD. Fritzel FD4 antenna, described by the late Dr. weBoost 5G Dome Ceiling Antenna - 50 Ohm (301121) $79. 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. but nobody does receive me. However the waveform didn't look very good to me. It had the same dimensions as the VS1AA multiband Windom antenna, but fitted with a 300Ω balun in its feedpoint and fed over coax. DL1JM did likewise. 00 €. but it was nice to meet you. I myself am working with a simple FD4 Antenna. This antenna was developed in Germany, although others likely advanced it also. A. Mivel valószínű, hogy egy sávon se félhullám hosszúságú, ebben az esetben, hossztól, frekvenciától függő impedancia transzformációt végez. Put it up yesterday and wow!! compared with a fd4 windom at aprox same hight noise went down 3-4 s and signal 2 - 5 s up using an ameriton Al 82 at full power no problems at all. So here at my home there is also room for improvement. G5RV. BEST COMPACT: Antennas Direct ClearStream 4V Long-Range TV Antenna. Fritzel used the shown dimensions of 13. 3 dB gain, incl. 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. $99-199. Various sizes of a ZS6BKW antenna can be found on the Internet, so that the original design of ZS6BKW is often overlooked. Flag at 50m point E. This trademark application was filed with the USPTO (United States Patent and Trademark Office) under the trademark classification: Computer Product, Electrical & Scientific. Antenna Windom Links → . 202 - Two Elements Phased Delta Loop for 40m. Its main advantage was that it could easily be matched to a tube transmitter. The half-size version is known as the FD3 40-20-10m antenna. isolators. I still young so I thinks this is normal, didn't we all start small. Free Shipping. . It will match on even and odd harmonics - but it. 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 half-size version of the FD4 is known as the FD3 (40,20,10m) and is the subject of this article. BEST LONG-RANGE: Five. vy good fr emcomm. Rated 5 out of 5 stars. TA4AU. At 8mA I am able to achieve 27dBm of output (500 mW) at 144MHz. Antenna parts category is a curation of 58 web resources on , Sandpiper Aerial Technology LTD, HexKit. 5dBdA («fig) 6 ÷ 1 balun of FD3 and FD4 antenna's has the same size as a 1 ÷ 1 balun. 8-m and 27. Z tego też względu w. HamSphere 4. 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 dB gain, incl. and "bout 15 MHz if matching is SWR Window on the following antenna 'g Of 41. Fritzel. 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. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. Ako bi već moralo, onda može biti zgodna kombinacija ukrštenog dipola za 3. NVIS Antenna Strategy • Portable and field antennas will be less efficient due to space, height and setup time • “Command post” or “Net Control” antenna should be as efficient as possible • Gains of up to 6 dB (i. This trademark application was filed with the USPTO (United States Patent and Trademark Office) under the trademark classification: Computer Product, Electrical &. One would argue that the stations worked would simply mail some funds to these DXpeditions to offset the lost income included with QSL requests. Please select a product. I made contacts with Azerbaijan, Suriname, Qatar and Thailand. Fritz Spillner1, DJ2KY, in 1971. 5; 7; 14; 18; 28 MHz-en. Opinions sought on Fritzel FD4. Ham radio call database for everyoneThe feedpoint of the 3-band antenna is not in the center, but more like a windom system: Off Center Feed (OCF). German Old-Timers immediately recall the well-known Windom antenna that Kurt Fritzel, DJ2XH, under the name FD4, brought to the German market in the early 1970’s (still available today by hofi, w . 0, but I wonder how to send WSPR or FT8. You have tried to build an FD4 antenna which is no bad solution at all. MHz 4. Just press the FIX switch the next 500 kHz range is available and a LED light. Antenna short 25ft off centre dipole OCD tied to balcony rail 15 feet high sloping down to 8 feet into hibicus bush. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer. isolators. The original Windom antenna (devised in 1928-29), named after Loren Windom, W8GZ. S. that's not what I'm trying to explain. 174 + 0. 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. be Multiband Delta Loop (W2EGH) | MyHam. incl. What we know. The wire tails connecting to the Balun Bolts are just ordinary Philips Spades. 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. 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. sierpnia 01, 2015. And they seem quite slack . So. Also, why every house should have an emergency way of listeni. , Corvallis, OR . North America. While the G5RV requires an antenna tuner, it is very efficient on at least 5 bands. By the way, a German ham told me that Herr Fritzel, the company founder, passed away recently. Fritz Spillner, DJ2KY, in "Die FD4-Windom-Antenne," QRV, Stuttgart, 25, December 1971, pp. 73 de Raimund DH8RD in JO44PE. Furthermore, none of these designs offered 30 m. PolyStealth Tm high strength PE insulated antenna wire, and Flex-Weave Tm wire. The Windom - Off Centre Fed Half Wave Dipole Antenna. Hi all, I bought the Mini1300 from China and Software says Version1. The theory of the. The Fritzel FD4 antenna becomes more popular in Europe and N. 13-20 describes a modified VS1AA OCFD with a 4:1 balun connected to a coaxial feeder. 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. The half-size version is known as the FD3 40-20-10m antenna.