Homebrew Fan Dipole

A half-wave dipole is usually fed at its center because this is where maximum current occurs. The primary cause of "interaction" between elements in a fan dipole is the electrostatic (capacitive) coupling near the ends of the wires, where the voltage is highest - I try to keep the ends of each dipole at least 1 meter away from all other antenna elements (2 meters separation is even better), and three times as far away from any other conductive objects/materials (this includes trees. Leave a comment Posted by rjbono on March 25, 2019. Feeding the dipole at that point. The dipole-doublet(s) 3. 15M requires an antenna tuner. I prefer the kind that come apart in the middle while keeping the adjustments. I built the stand from old redwood that I got from taking apart an old deck I built many years ago. 10 Meter Half Wave Dipole Antenna with W2FMI 1500 Watt Balun. Cheap HF Homebrew 40m 20m 15m Vertical antenna. Search this site. Polarization of electromagnetic fields radiated by dipole-transmitting antennas correspond to element orientation. I use the term “Hamstick” in a generic sense. MARS frequencies can be greater than 100:1 for an 75m dipole and even for the cross- dipole antenna, as high as 30:1. Now on my 40m Fan dipole @ 40 watts around 10:30pm, slightly inverted V at almost 30 feet (click image to expand). Multi-Band Dipole I built a multiband dipole that will work and 10 meters for ham radio. • The antenna shall be supported from a single point at its center. If you have a large enough attic in your deed-controlled home, you may find this variant of the fan dipole just what you need to get on the air and enjoy the challenge of amateur radio. I'm using it to demonstrate the resonance of the Windom on different bands. Slim Jim (J Integrated Match J-Pole) The 2 meter Omni Samurai Antenna; Homebrew 2 meter Amateur Radio Antenna from Ordina A vertical aerial for 70 cm; A J-pole aerial for 50MHz; 2M J Pole antenna; Two & Six Meter Beam antenna; New Carolina Windom Antenna; The Double Bazooka Dipole. 7 out of 5 stars 14. A few changes were made, in that I built this one to cover the above bands, but the SWL version was designed for 10-80. 2x10 M (2x33 FT) MID-LOADED DIPOLE. Single Band Full Size Dipole Antenna. So the measurements are based on a 40 meter 1/2 wave dipole. One of the simplest wire antenna de-signs is also one of the oldest: the ran-. or other configuration that is essentially an unbalanced input to unbalanced output. It can be hung in a tree or mounted on a pole. MARS frequencies can be greater than 100:1 for an 75m dipole and even for the cross- dipole antenna, as high as 30:1. See why the Greyline DX Vertical Antenna is called a high-performance antenna system. Available from these sellers. An easy project I was able to tackle in one day. Works with all HF bands. Made in the USA. The dipole antenna is an excellent option for many amateur radio applications especially on the HF bands like 80 metres, 40 metres, 20 metres, 15 metres and 10 metres. 160-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 240' Dipole with 100' Feedline $169. At higher frequencies, up to 30 MHz, its gain matches the dipole's. Building A Homebrewed Off-Center Fed Dipole Scanner Antenna. The Pacific Antenna Dual Band Trap Dipole kit provides a lightweight, portable trap dipole. You may find other interesting sites similar to this one, under the following categories: Antennas/Fan Dipole - Fan-Dipole. 7 out of 5 stars 14. Will handle up to 1500 Watts with SWR below 2:1. A dipole up half a wavelength will have its best gain at 29 degrees above the horizon. As a followup, I've now built and hoisted the fan dipole. Thanks very much!! Top. It tunes up between 1:1 and 1. On the other hand, an OCF dipole is an ungrounded dipole antenna fed with twin-conductor line, either coaxial or open wire parallel conductors. Wideband Dipole for Receiving 16 24. Bow-Tie Dipole Antenna 13 19. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end.   Spoken in response to my 40m Linear-Loaded Dipole deciding to shift frequency slightly and require a slight prune on 2 separate occasions. Caged Fan Dipole Project. How do we get back the 160 meter resonance? By placing a series. A fan dipole is a set of dipoles for different frequencies all tied together at the feedpoint. Buckmaster 7-Band OCF Dipole Antennas are 135 feet (41 meters) long and work on 80, 40, 20, 17, 12, 10, and 6 meters. By Steve Ford, WB8IMY easy to understand why hams have had an almost 100- year love affair with wire antennas. The Short Dipole "On Coils" There is very popular method of making a short dipole ("physically shorter than normal" half-wave dipole) resonate at a given frequency. Does anyone have any ideas?. The folded dipole needs a 4:1 balun to match coax, but is a good match for 300 ohm twin lead. Homebrew; Meeting Minutes; Miscellaneous; SSTV; Recent Posts. SWR will be high. It is omni directional (in azimuth) and, if it is a half-wavelength long, has a gain of 1. Call or Text: 574-575-6787. A half-wave dipole is usually fed at its center because this is where maximum current occurs. 5MHz ham radio band when the mast is only about 14 metres or 45 feet high. Connect one end of each cut wire to one side of a piece of choc block and to the other sides connect the core and. These are the parallel-wire type of multi-band dipole kits with special spacers to keep the different dipoles separated all connected to a common feedpoint and 1. Hamradio Homebrew 2 Meter Square Dipole Plan; VHF or UHF Yagi BALUN Calculator. The Alpha-Delta DX-EE 40-10 meter dipole fit the need. revised some wording 1/11/2010. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. A view of the SGC-230, with its cover removed, is given below:. The Basic Dipole Current vs. WBØTGE’s Mighty Woof 2m/440 Fan Dipole. It can be stranded or solid, bare or insulated. 10 Meter Half Wave Dipole Antenna with W2FMI 1500 Watt Balun. 5 SWR and cannot get it lower do not panic. Reasons to build a full size plug and play tuned NVIS dipole: •Full size antennas put out full size signals! Maximum power and voltage transfer occurs when the antenna chain has matched. Neither of those options really sounded all that great though. With a tuner, it should load up just about anywhere and might even work. Z-match ATU covering 160m – 10m October 23, 2003 David Antenna tuning units , Radio Construction As a new Ham, I put up a homebrew 40m coaxial dipole which wouldn’t even give me a good SWR on 40m!. The Alpha-Delta DX-EE 40-10 meter dipole fit the need. Wideband Dipole for Receiving 16 24. – May be difficult to thread through trees. 26 - Linearly Loaded Tee Antenna. The antenna was created for the 40 meter band and above. Antennas currently in use at the home QTH: Fan Dipole 80/40/20/15/10/6m; End Fed for 20m multi band (80/40/20/10m) End Fed for 17m WARC; Diamond X-30N (1/2wave 2m, 2x5/8wave 70cm) Diamond D-130 discone (50-1300MHz) RigExpert antanna analyser measurements for all home. Thomas Sowell. Table 4 gives us the dimensions and the performance of the array on each band with the 80-meter dipole 50′ above average ground. You can drag the antenna anywhere. ” This is essentially a dipole cut for the lowest frequency of interest and fed with 450 ohm ladder line. Stroobandt, ON4AA, in the year 2006. 38' ½ lambda 0. It wasn’t so much a farm – more like a window box! HF homebrew multiple dipoles. 1 over entire band 20 meters swr 1. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead o. I had the 40m run flat across the top an had the 20m angled down so it wouldn't get tangled with the 40m antenna. 2011-February-11 - Homebrew DXCC. Most commercial and homebrew tun-ers consist of a. Separate Tuned Wires For Each Frequency - A "fan-dipole" antenna with separate resonant ½ wavelength wires for each frequency can be constructed. Works with all HF bands. The spreaders can be made from any non-conductive material such as PVC conduit pipe or you can use ladder-line and make the whole lot from 1 piece of cable. Wideband Dipole Antenna 15 23. great dipole THAT is a great looking dipole! I love building and using simple antennas. Polarization of electromagnetic fields radiated by dipole-transmitting antennas correspond to element orientation. DIPOLE = 0 Foot 0. The end isolator and spreader shown from a different angle. 5 dBd (dB referenced to a dipole) or a little over 9 dBi. Low cost Follow up1/18/12 Antenna survived big ice storm. Overall length is 82 ft. Greyline 12-foot DX Vertical Antenna, an OCF vertical dipole for all band HF radio operation. The dipole gives much better performance than you may expect from such a simple antenna. RADIO WORKSTM Off-Center-Fed Dipole Insulator 1 Insulator 4 Insulator 3 Insulator 2 1 5 m e l e m e n t 15 mele ment Kevlar® Kevlar® Coaxial Feedline RG-8X or Super 240 is recommended RADIO WORKSTM OCFD MAXTM 40 + 15 covers 40, 20, 17, 15, 12, 10, 6 m See website for power rating details The 15 m element is supplied only with the OCFD MAX 80. Compact Multi-Band Rotatable Dipole Antenna Array Dr. Its now up at around 30~35 feet, still in a dog leg configuration. This is a nice fan dipole drawing from I have built many of these over the years with different band combinations. T he dipole is one of the most popular antennas and one of the most practical. The model assumes that antenna is 10. Stainless Steel Hardware. Raise and repeat SWR measurement. Place a 1:1 Balun on the Antenna end of the Feedline. The feeding point part of the folded dipole, with the spreaders, and the 4:1 balun. One is to mount and raise one pair of antennas at a time, and tune each pair to present a 50 Ohm load. By Steve Ford, WB8IMY easy to understand why hams have had an almost 100- year love affair with wire antennas. I will be giving one away to celebrate #100. The SWR is less than 1. Note that this is the same as a standard dipole. 16’ ¼ lambda 60 METERS = 62. 4 feet for the other leg. Low cost Follow up1/18/12 Antenna survived big ice storm. The 15 meter dipole will not tune if you have a 40 meter dipole in the fan, we played around with it, and got a 3:1 VSWR as you did. Homebrew 220 MHz 5/8 wave ground plane. That night at home the thought struck me that the fan dipole could be used for the VHF/UHF bands. I had the radios but needed an antenna that would work on most amateur bands and others if needed. Homebrew; Meeting Minutes; Miscellaneous; SSTV; Recent Posts. Many hams' first choice of antenna is a half-wave dipole. Will test with a 450 ohm load tomorrow. The multiband fan dipole is probally one of the most efficient multiband antennas you can build due to the fact that individual dipoles are tuned for each band of operation and fed by one single length of coaxial cable. This article will introduce the Half-Extended Double Zepp (HEDZ) which has characteristics that a lot of amateur radio operators should find quite interesting. A variety of models are available including 80, 40 20, 15 and 10 meters, or 40, 20, 15 and 10. 12-foot DX Vertical Antenna. I started the same as you, one plain jane 20M dipole. Looking down on the antenna from directly above it, the gain along the direction that the wires point is a negative 0. 2m Dipole Antenna Construction Project Lightweight portable QRP 2m & 70cm half wave dipole for SOTA or an emergency antenna for the 2m and 70cm Go-box. Here I build a multi-band dipole antenna for HF use on 40-20-15-10-6 meters. ' •The'nonNresonate'dipoles' reject" unrelated'power' Trap'Dipole'for'40/80'meters' ' The'LC'circuit'presents'a'high' impedance'at'40'meters'and' low'impedance'at'80'meters'. Separate Tuned Wires For Each Frequency - A "fan-dipole" antenna with separate resonant ½ wavelength wires for each frequency can be constructed. 4 cm for North American channels 11 and 16. The term fan dipole refers to a dipole where each side of the antenna is composed of several wires. Hence, the charge and current patterns do not satisfy the dipole conditions above the lowest band or two. These are antennas that are simple and effective. Simple Fan Dipole. Portable End-Fed 160-10 Meters Dipole Antenna George on 24th Feb 2020 This is the 4th or 5th product that I have purchased 4 or 5 items from ni4l. One combination that fits nicely is 3/4" copper pipe with 3/4" CPVC fittings (not to be confused with 3/4" PVC fittings which will be too large). Instead of just one wire split in the middle at the feedpoint, folded dipoles have two closely spaced wires joined at the ends. Many HF radio station situations require a hidden or stealth antenna using only a house or building to support the antenna. My backyard has a moderate slope so that the north end is slightly higher than the south end, but the antenna is 24' about the ground from end to end. One is to mount and raise one pair of antennas at a time, and tune each pair to present a 50 Ohm load. It will be better than the 5. I expect that after the trees grow their leaves, it will be very hard to see the antenna at all. Original 40M dipole Simple Fan Dipole for 80, 40, 20 Using a corner of the house as the center point (The numbers on the wires are for use with EZNEC. The fan dipole is usually constructed of multiple sections of wire tuned for each band required. I know its far from ideal but working with the space and mounting options I have available, one of my options is an off-center fed dipole for 40 20 10 meters using a 4:1 balun in the middle up at the tower mount. The 20 m folded dipole antenna set up in EZNEC for simulation. No tuner needed. The purpose of building 2 was to have an East-West broadside and a North-South broadside on the dipoles. The antenna is currently configured as two independently centre-fed half wave inverted V fan dipoles for 20 and 10m. One of these days it's going to be a fan dipole… For most beginning ham operators, a half-wave dipole is the starting point. Multi-Band Dipole I built a multiband dipole that will work and 10 meters for ham radio. Smarter, stronger and more elegant all-band ham radio antenna option. • The antenna shall be installed on a 1. An inverted V has reduced input impedance and is often a good match for 50 ohm cable. EAntenna Multi-Band Wire Antennas are cleverly named Multi-Fan Dipoles. That works out to dipole lengths of 70. 885mhz, and 7. multiband dipole presented in August QST. 16' ¼ lambda 60 METERS = 62. 5 dBd (dB referenced to a dipole) or a little over 9 dBi. A Broadband Butterfly Terminated Dipole Antenna BBTD Version for House Roof or Attic. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. A feedpoint insulator/connector, with a balun if you are feeding a balanced antenna with coax (e. All the resonant dipole antennas I have made previously seemed to function just fine when used with 50 Ω coax and no balun. An easy project I was able to tackle in one day. A high and clear dipole should have about 72 ohms of input impedance and be a great match for 75 ohm coax. EZNEC says the gain at that elevation will be in the range of 7 to 8 dBi. The Alpha-Delta DX-EE is a "fan dipole" design. 0 MC plus a twin-lead J-Pole vertical for 2 meters. This offset gives the antenna the multi band capability. But the interaction between each element made it also difficult to tune. Homebrew 220 MHz 5/8 wave ground plane. A fan dipole, like any other antenna, is a compromise antenna. Stroobandt, ON4AA, in the year 2006. A feedpoint insulator/connector, with a balun if you are feeding a balanced antenna with coax (e. 80/30, 40/15 meters. Maybe because it needs twice as much wire. Antennas, Contests, ham radio Antennas, contest, fan dipole, ham radio, Homebrew, inverted V. It is omni directional (in azimuth) and, if it is a half-wavelength long, has a gain of 1. Tuning the antenna is simple. Available from these sellers. Although the above article mentions a scanning station, this applies to HF, too; Grounding is Key to Good Reception (Blog article) HFLink ALE. The Coax fed Fan Di-Pole, Lot's of Bang for a few Bucks. A dipole up half a wavelength will have its best gain at 29 degrees above the horizon. It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands" See All Details : See more. HF Broad Band Wire Dipole Antennas HF broad band antennas for tactical and fixed use , broad-band dipole and rhombic antennas. 09 metres of wire. As shown in figure 1, a 1/2 wave section of 300 ohm twin lead is cut, and the ends twisted together. My new one up is a 10-20-40 Fan dipole. until dipole has an SWR of 1. Fanned dipoles 4. The dipole gives much better performance than you may expect from such a simple antenna. resonant dipole for the lowest band desired and feed it off center with a balun. Joined: Dec 18, 2008 Messages: 11,266 Likes Received: 3,137. Web description. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. He told me that the reason why he selected my book over others was “it’s the only book on the marketthat people can give to a secretary, or clerk-typist, and expect them to be able to put up a working half-wavelength dipole two hours later. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. Some call this a fan dipole. Mounting Ham Antenna In Attic September 28, 2018 - by Zamira - Leave a Comment Stealth antennas attic mount vs roof qrz forums tarpn antennas indoor attic dipole antenna for ham radio cq antennas how to install a tv antenna in your attic long range signal. HF Flagpole antenna for 10-80 Meters. 0Mhz for a 40/20m dipole. HF 8 band Fan dipole multiband antenna 160-6 meters with Balun Product Description The 5 element fan dipole works very well at covering all the bands 160-6 meters. CIRCUIT DIAGRAM. I apologize for the poor photos of the SWR chart, but I just got my AA-30 analyzer, and discovered it does not save for later review, so I had to take a photo of the screen to get this… I added the band. Here's my homebrew 30 meter full quarter wave vertical. Magnetic Loop Receive - Below is a view of the panadapter, notice how there is a pronounced peak where the antenna is tuned and as you deviate from that the received signal gets weaker (click image to expand). I have 5 more available. The Basic Dipole Current vs. Each pair of elements. Stacked Dipole Arrays An array of 2 and 4 centre-fed dipole antennas with phasing harness mounted on an aluminium mast designed for various radio networks. [1, 2] This antenna’s length is selected to work well on one Ham radio band, with an acceptable standing wave ratio (SWR) over about a total bandwidth of about 3% of its center frequency, which is usually enough. 2" inches wide for 10-20-40-80 meters no tuner needed. The dipole antenna still remains the primal antenna. You may find other interesting sites similar to this one, under the following categories: Antennas/Fan Dipole - Fan-Dipole. 5 Wires parallel for each band, fed by a balun at the common center. 5" braided dipole wire. An Extended Double Zepp (EDZ) is a 5/4 wavelength center-fed dipole, i. The disadvantages are a bit rough. INVERT VEE = 0 Foot 0. It is omni directional (in azimuth) and, if it is a half-wavelength long, has a gain of 1. length (L), with several inches added for tuning and for securing to. Yaesu FT-817D with homebrew multiband fan dipole. 5:1 for receiving purposes. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. The fan dipole is usually constructed of multiple sections of wire tuned for each band required. Got the tuner and now have a 10-80m inverted V up. In fact, a half-wave dipole will often outperform many compromise commercial multiband antennas. The caps are optional and are for the prevention of mud dauber nests. The fan dipole. 7 percent to L for an Inverted V configuration, depending on apex angle. The so-called " OCF windom " is also a misnomer, for the same reasons. It is the best you will ever do with a dipole feeding it with a 50 ohm coax. A fan dipole for the final application that is described here would be mechanically complex, and less likely to stay up in an ice storm. Came across this somewhat stealth multiband dipole antenna project. Whenever I would go to a sidewalk sale or hamfest I would pick up any components that might someday come in handy to make an antenna tuner. Multiband Tuned Doublet Antenna 14 21. If you have a longer garden, you can move the pig-tail join further back the return wire. The end result for today was, the 40/80m Fan dipole is resonant without an ATU on both bands and works very well on my first test. 4-1 at 7285 an goes up very slowly from there. An Extended Zepp (EZ) is an end-fed 5/8 wavelength antenna. Neither of those options really sounded all that great though. A 40M l/4 Vertical with Elevated Radials Larry Banks, W1DYJ First licensed: 1962 (KN1VFX) •Original 40M Dipole Original 40M dipole Simple Fan Dipole for 80, 40, 20 Using a corner of the house as the center point (The numbers on the wires are for use with EZNEC. I will be giving one away to celebrate #100. 700 amateur radio topics - 6,000 links & 133 pages - from antennas to zones. A fan dipole, like any other antenna, is a compromise antenna. The impedance of this antenna is around 300 ω, so you may want to use a transformer or a λ/4 long piece of 120 ω coaxial cable to match this impedance to 50 ω. If they are not installed, increase the pipe. A trapped dipole is a dipole with blocking filters fitted at the operating wavelengths. I had the radios but needed an antenna that would work on most amateur bands and others if needed. The Coax Fed Fan Di-Pole can get you on the air over 4 different bands with a single coax penetration into the shack. I design and construct my main station antennas, making frequent modifications to help improve their performance and coverage. High Strength Aerial Wires are manufactured with high strength, high conductivity Bare Copper-Clad Steel (BCCS) and insulated with a high quality UV Resistant Polyethylene to provide you with one of the strongest and longest lasting antenna. Single Band Full Size Dipole Antenna. This article will introduce the Half-Extended Double Zepp (HEDZ) which has characteristics that a lot of amateur radio operators should find quite interesting. 5 Element LPDA Beam VHF UHF Cell WiFi Jamming Antenna. BELOW While I'm showing you my homebrew 30 meter vertical, you can look below and see my Hustler mobile whip I mounted on my deck. This is a nice fan dipole drawing from YC8PVU. One is 14 gauge stranded, the other is a smaller, single copper strand. After all, a half wave dipole is 250 feet long. 4 Band Plus Ground Mounted Vertical; Algerian Amateur Radio Union (ARU) Light House Special Event Aug 17th To Dec 15th 2016; 4:1 FB 3061-ROD X 2 BALUN CAN HANDLE 125 WATTS. The Delta Loop is not only a great transmitting antenna but a low noise receiving antenna. 18 - Bow-Tie Dipole Antenna. Web description. I expect that after the trees grow their leaves, it will be very hard to see the antenna at all. I have it suspended from the center feed point / RF choke and from the ends at about 40 feet. The antenna is currently configured as two independently centre-fed half wave inverted V fan dipoles for 20 and 10m. Homebrew fan dipole with elements for 75, 40, 20 & 10 meters. breaking strength. Cheap HF Homebrew 40m 20m 15m Vertical antenna. T he dipole is one of the most popular antennas and one of the most practical. This antenna is a rewarding and inexpensive project for those of you who like to homebrew your own equipment. We cut the element for the lower frequency and let it serve double duty at the odd harmonic, thus enabling greater band coverage. Link dipoles are a great way to make a lightweight multi-band antenna because you only have one run of wire (vs a fan dipole), there are no traps or coils, and you don’t need a complicated and heavy balun (vs an off-center-fed dipole). The simplest wire antenna for ham radio is a dipole, which is a piece of wire cut in the middle and attached to a feed line. The 43-foot Vertical Antenna Advantages -Still can be self-supporting & moderately unobtrusive -Approximately 3x higher radiation resistance than the typical trap or loaded vertical. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. Here I build a multi-band dipole antenna for HF use on 40-20-15-10-6 meters. Saturday I switched focus to 20m using the dipole. Known as a “fan dipole” they have been in the Handbooks since the 1930’s; it’s the electrical basis for the military AS-2259. Homebrew Hamstick fan dipole for 75,40,20,10, and 6 meters. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) was invented and first described by yours truly, Serge Y. Bow-Tie Dipole Antenna 14 20. Homebrew Dipole for 20 meters. I built the stand from old redwood that I got from taking apart an old deck I built many years ago. Voltage Impedance Follows • Insulators –Home Brew for $1 A “Fan” Dipole Offers Multiband Operation But Can Be Tricky To. Homebrew 220 MHz 5/8 wave ground plane. Making a Fan Dipole – KB9YOJ; SIARA Slow Scan TV Net FAQ; Planning meeting 3/26 – 7pm Zoom Conference; Calling all HAMS! Tune in to HAM TALK LIVE! Thursday night 3/19/2020 – Matt Bonadies KB9YOJ as guest! Friday Evening SIARA VHF Net and Virtual Meeting – 146. Be prepared and able to communicate in case of emergency with the largest selection at eBay. I apologize for the poor photos of the SWR chart, but I just got my AA-30 analyzer, and discovered it does not save for later review, so I had to take a photo of the screen to get this… I added the band. The best SWR you will ever achieve (in theory) is 1. My backyard has a moderate slope so that the north end is slightly higher than the south end, but the antenna is 24' about the ground from end to end. 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. Many hams’ first choice of antenna is a half-wave dipole. A fan dipole, like any other antenna, is a compromise antenna. I prefer the kind that come apart in the middle while keeping the adjustments. 83' 3/8 lambda 40 METERS = 65. Fed with a single coax thru a choke balun/unun. 0 Inches in overall length and 0 Foot 0. That worked fine business. That works out to dipole lengths of 70. Maybe because it needs twice as much wire. It would not have the gain of the doublet, but simpler to erect in field. I had the radios but needed an antenna that would work on most amateur bands and others if needed. Homebrew 5/8 wave 10 meter wire vertical w/ ground radials. For the most part, this is true. The price is $65. 0 Inches for one side. The 20 m folded dipole antenna set up in EZNEC for simulation. Mine had four wires, 40-20-17-10 meters, so 15 meters was tuned by the 40 meter dipole element. It (along with some additional information on this subject) has led me to design and build a multi-band fan dipole antenna for use at Field Day events. Since the magnitude of. The antenna consists of a regular 40 meter dipole using a […]. 1 over entire band 20 meters swr 1. The dipole antenna still remains the primal antenna. The antenna is currently configured as two independently centre-fed half wave inverted V fan dipoles for 20 and 10m. 5:1 for receiving purposes. 25 - Right Angle Marconi Antenna. The PA150 is a 200 Watts SSB/CW rugged HF Linear amplifier units that will give many years of hard working service latest and smallest amplifier. Homebrew 220 MHz 5/8 wave ground plane. A fan dipole, like any other antenna, is a compromise antenna. Came across this somewhat stealth multiband dipole antenna project. 8 MHz, its power gain is 11 dB greater than the dipole's at low elevation angles (for DX). This is a nice fan dipole drawing from YC8PVU. So, a GOOD tuner is OK, and likely necessary. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. My last QTH had a tiny postage stamp for a garden, less than 30 feet x 30 feet. Home Brew High Power 4:1 Air Core balun For Multi Band Fan Dipole اسعد الله اوقاتكم في اثناء اجازتي السنويه و بعد كم من يوم من الراحه اللتي كانت مفتقده منذ مده اردت. 1 ratio on the ol SWR meter you will need to use 70 ohm coax to feed the antenna. This would be 109. , about ¼ wavelength. The dipole gives much better performance than you may expect from such a simple antenna. Yaesu FT-857D with a homebrew 20M inverted vee, Yaesu FT-8900R with a Comet Tri-Bander (6M/2M/440) roof-mounted roughly 35' high. This is the way a fan dipole works, and what we have here is a fan dipole that is, in effect, turned sideways. Many of my sticks are Pro-Am (Valor - out of business I suspect) and the newest ones are from Jetstream. Category Archives: Homebrew Making a Fan Dipole - KB9YOJ By Matt - KB9YOJ | April 3, 2020 - 3:19 pm | April 3, 2020 Antennas, Homebrew. It can be constructed a variety of ways, but Figure 2B shows the technique I used to build my first antenna. Lower frequencies will pass the trap effectively making the antenna bigger. Simple Fan Dipole. The W8AMZ Dipole Antenna Starter Kit comes a center insulator made from PVC pipe, similar to the Unadilla W2AU ANsulator and two end insulators. 00 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 125' Dipole 50' Feedline $93. by Frequency Devices. I purchased these directly from Budwig and saved some money doing so. 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole- 125' Dipole 150' Feedline $178. It costs $18. Smarter, stronger and more elegant all-band ham radio antenna option. Indoor Hf Multiband Antenna. php 6791 Bytes 12-02-2018 11:22:29. Most commercial and homebrew tun-ers consist of a. Each pair of elements. 0Mhz for a 40/20m dipole. The formula to calculate the length of the antenna is 147/frequency in MHz, this gives the total length of the dipole in metres. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. This is the length of a standard dipole but instead of dividing the result in half, use a 36/64% offset to determine the feedpoint. SWR will be high. It may also work. com in a single category. The term fan dipole refers to a dipole where each side of the antenna is composed of several wires. Thomas Sowell. The fan dipole is a multiband 1/2 wave HF dipole antenna with multiple elements for different bands, using the same 50 ohm center feedpoint. Fax 414-358-3337 Service 414-358-4087 [email protected] There are several home-brew options here ranging from suitable pieces of wood, Perspex sheet, plastic or ceramic Tees or open-wire insulators, up to commercial centre pieces with built-in coax connectors. Additionally, I also had the problem of overhead power cables that ran parallel with, and about 18 inches away from the back fence, thus installing any kind of HF antenna required a bit of homebrew ingenuity, this is where the. Web description. Very thin wire can be virtually invisible and can be used in many configurations. The antenna consists of a mini-flat top dipole, with three resonant dipole legs all terminating at a common feedpoint. For the antenna layout below, the center capacitor is 15 pF at element 3 between elements 2 and 4 and a 4:1 balun feeds the antenna between elements 1 and 2. 17 - Delta Fed Dipole Antenna. When we go off center the currents and voltages are no longer in correct phase and it becomes necessary to use a Guanella or current type balun. I have a homebrew fan dipole antenna. I'm using homebrew Windom-Antenna recently. I suspect because of the substantial interaction between the ends of the 40, and especially the 80m dipole, tuning it is going to be a real pain in the butt, and it is likely you'll find some bands that. Homebrew 2 meter Amateur Radio Antenna from Ordina A vertical aerial for 70 cm; A J-pole aerial for 50MHz; 2M J Pole antenna; Two & Six Meter Beam antenna; New Carolina Windom Antenna; The Double Bazooka Dipole; A Two-Band Fan Dipole; 6 M Base station Di-pole antenna; A simple 6m beam; WIRE DIPOLE ANTENNAS; 3 ELEMENT YAGI BEAM 50 MHZ(6M) VHF Beam. Caged Fan Dipole Project. The red coating on the homebrew capacitor is the red liquid electrical tape I used. 25 lambda 0. All Antennas, Base. As shown in figure 1, a 1/2 wave section of 300 ohm twin lead is cut, and the ends twisted together. We cut the element for the lower frequency and let it serve double duty at the odd harmonic, thus enabling greater band coverage. The first post described an off-centre fed dipole with a 200 ohm feedpoint impedance. It's only about 15 to 20 feet above the ground and I can work worldwide. It is the best you will ever do with a dipole feeding it with a 50 ohm coax. An OCF antenna is similar to a dipole, except that it is not fed at the center but at a point offset from the center. The vertical dipole's noise floor was S3 (-106 dBm 3 kHz BW) which is good. Culp, W5SDC. Calculations for the wire lengths can Build a multiband hf fan dipole. Can I feed it with ladder line and get rid of coax cable or should I build A new dipole for 160,75,40 meters and feed it with ladder line I have manual tuners and auto tuners too. website url: pa0rob. 00 Further info. Homebrew Dipole for 20 meters. After spending some time modeling OCF antennas, the closest antenna I could find to a true multi-band dipole with reasonable SWR on most bands had an 80%/20% leg length and 200-ohm feedpoint. Web description. In the drawing above, it is shown for just four bands, 80 thru 10. It costs $18. Here's my homebrew 30 meter full quarter wave vertical. Due to the fact. The fan dipole is usually constructed of multiple sections of wire tuned for each band required. The term fan dipole refers to a dipole where each side of the antenna is composed of several wires. 1 ratio on the ol SWR meter you will need to use 70 ohm coax to feed the antenna. 10 product ratings 10 product ratings - MFJ-2240, 40 Meter Mini-Dipole Includes MFJ-347 & 2 MFJ-1640T Hamstick Antennas. I cut a 40m dipole to around 65 feet long, and married it to the 80m dipole. Fan-Dipole Antenna for 80m through 6m. FREE Shipping by Amazon.   It includes pre-made Jungle Antenna ground planes cut for 28 MC and 51. Wideband Dipole for Receiving 16 24. The 15 meter dipole will not tune if you have a 40 meter dipole in the fan, we played around with it, and got a 3:1 VSWR as you did. Attic Fan dipole antenna that allow to operate QRP from 40 metres to 10 metres, specifically 40, 20, 17, 15 & 10 meter band (by M0WYM) The Fan Dipole Fence. My latest design, Dual Band (VHF /UHF) fan dipole. It was something I had built when I was a kid for SWL, and decided to try it again some 40 years later for transmitting. Why another one? Well, why not!. 2m Dipole Antenna Construction Project Lightweight portable QRP 2m & 70cm half wave dipole for SOTA or an emergency antenna for the 2m and 70cm Go-box. The PA150 is a 200 Watts SSB/CW rugged HF Linear amplifier units that will give many years of hard working service latest and smallest amplifier. Re: NI4L fan dipole « Reply #13 on: February 07, 2015, 01:11:47 PM » I added about a foot to each side of the 80-40 meter dipole on the 40 meter part, and the swr is 1. All the resonant dipole antennas I have made previously seemed to function just fine when used with 50 Ω coax and no balun. After spending some time modeling OCF antennas, the closest antenna I could find to a true multi-band dipole with reasonable SWR on most bands had an 80%/20% leg length and 200-ohm feedpoint. Home-brew Fan Dipole - 20/10m. Separate the speaker wire into two 18-foot lengths. 10 Kw Linear Amplifier. Back yard view. Slim Jim (J Integrated Match J-Pole) The 2 meter Omni Samurai Antenna; Homebrew 2 meter Amateur Radio Antenna from Ordina A vertical aerial for 70 cm; A J-pole aerial for 50MHz; 2M J Pole antenna; Two & Six Meter Beam antenna; New Carolina Windom Antenna; The Double Bazooka Dipole. com I call this the “Mighty Woof” antenna. The kit also includes extra wire for dipoles, half-rhombics and Vee beams on other bands. 06 meters of wire. I prefer the kind that come apart in the middle while keeping the adjustments. For years I've thrown together simple antenna tuners to get me on the air when needed. The 20 m folded dipole as a Inverted V. Saturday I switched focus to 20m using the dipole. 75 METERS = 57. The best description for the HF antennas this page details is probably just a "centre fed dipole. Note that this is the same as a standard dipole. The "Cylinder" - Center Connector for Dipole Antenna: This is another alternative home-brew center connector for a dipole. 10 meters swr 1. The disadvantages are a bit rough. Study of G0FAH Off Centre Fed Dipole (OCFD) (40m-20m-15m 10m) 40m 20m 10m The G0FAH 4-band antenna is modelled using MMANA-GAL basic freeware antennal analysis software. Aluminum/copper tubing construction: You will need to check the fit of the tubing with the T connector and the caps while you are at the store. 80/30, 40/15 meters. It is subdivided into switched sections to support the 20-, 17-, 15-, 12-, and 10-. The Center-Loaded Off-Center-Fed Dipole (CL-OCFD) was invented and first described by yours truly, Serge Y. A fan dipole is a set of dipoles for different frequencies all tied together at the feedpoint. Homebrew 40 meter dipole in the attic. G5RV Antenna 15 22. You may find other interesting sites similar to this one, under the following categories: Antennas/Fan Dipole - Fan-Dipole. 09 metres of wire. You'll also find here many innovative new Accessories for hf/vhf portable antennas. By Steve Ford, WB8IMY easy to understand why hams have had an almost 100- year love affair with wire antennas. A single wire with high performance on 160, 80, 40 & 30 meters. There are various models in the 'Smartuner' family (see the SGC website), but the 1. The antenna is currently configured as two independently centre-fed half wave inverted V fan dipoles for 20 and 10m. The Alpha-Delta DX-EE is a "fan dipole" design. Can of course scale it to whichever three bands you like, for example substitute 20m or 30m for 60m. com, 4/9/12 Introduction Having limited space led to the design of this multi-band antenna array, which has a foot print of approximately 15 feet. How do we get back the 160 meter resonance? By placing a series. -No trap or loading coil losses to worry about -Modest compromise SWR from 60-10 meters when fed with a 1:4 unun. Homebrew Extended Double Zepp for 6 meters, coax fed. Wideband Dipole Antenna 15 23. I have a homebrew fan dipole antenna. I am using a home brew ladder line with wire spaced 4 inches apart. Will handle up to 1500 Watts with SWR below 2:1. Since MMANA-GAL cannot. Made from #14 7/22 stranded hard-drawn copper wire. BELOW While I'm showing you my homebrew 30 meter vertical, you can look below and see my Hustler mobile whip I mounted on my deck. In fact, a half-wave dipole will often outperform many compromise commercial multiband antennas. Steve Yates - AA5TB. 4 cm for North American channels 11 and 16. The line isolator is used to isolate any RF (common mode) that may have worked its way back to your station. One is 14 gauge stranded, the other is a smaller, single copper strand. 40, 30, and 17 Meter Fan Dipole - Half-W is used by Jason Johnston (@kc5hwb) in Homebrew Dipole Antennas. A high and clear dipole should have about 72 ohms of input impedance and be a great match for 75 ohm coax. Hamradio Homebrew 2 Meter Square Dipole Plan; VHF or UHF Yagi BALUN Calculator. I like building antennas from copper pipe and have made many j-poles for myself and others. I had the 40m run flat across the top an had the 20m angled down so it wouldn't get tangled with the 40m antenna. This 50-ohm impedance antenna, when fed with 25-100W of SSB RF at 435MHz, makes reaching Amateur satellites such as AO-40 and AO-10 a snap! "Homebrew" UHF Yagi for Satellites by SV1BSX. As expected, DX was difficult. An Extended Double Zepp (EDZ) is a 5/4 wavelength center-fed dipole, i. Measure 206 11/16 inches from the end of each wire, and cut the wires to this length. I used to use a 20/40m fan dipole until i got a tuner. I started the same as you, one plain jane 20M dipole. After some juggling with the wire lengths the antenna gave me 1:5. The antenna consists of a mini-flat top dipole, with three resonant dipole legs all terminating at a common feedpoint. For covert operations, the fan dipole may be deployed without an antenna mast. A variety of models are available including 80, 40 20, 15 and 10 meters, or 40, 20, 15 and 10. 1 over entire band 20 meters swr 1. Homebrew Dipole for 20 meters. 1 product rating 1 product ratings - NEW ICOM AH-710 1. The so-called " OCF windom " is also a misnomer, for the same reasons. In my case I'd cut a dipole for about 43 MHz and then another one for say 153 MHz. Why another one? Well, why not!. Hf Vertical Dipole. Neither of those options really sounded all that great though. Homebrew inverted L for 160 meters. As a followup, I've now built and hoisted the fan dipole. One of the reasons 160 meters remains relatively uncrowded, however, is that effective antennas for this band are very large. Homebrew 5 Element VHF Yagi. 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. Made from #14 7/22 stranded hard-drawn copper wire. 3 MHz, or the 40-meter band. This is a nice fan dipole drawing from YC8PVU. 40, 30, and 17 Meter Fan Dipole - Half-W is used by Jason Johnston (@kc5hwb) in Homebrew Dipole Antennas. CIRCUIT DIAGRAM. Today's antenna, the HF folded dipole, doesn't seem to be that widely used among amateurs. 6 MHz and you arrive at an overall length of 130'. 5~57) Broadband Ground-Plane Vertical Base Antenna. Dipole resonance is lower in frequency (dipole too long). Built from stainless steel and aluminum hardware to resist corrosion, these rugged traps have a pull strength of over 600 lbs. No need for any additional guys and the two dipole elements plus the back guy are all you need for a stable and robust system. 00 plus shipping from Texas to your location. 640 Repeater. 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. R`s it is fed with 85 or so feet of LMR-400 coax. W1DYJ ~ Larry Banks DXCC WAS VUCC WAC Modeling an 80/40/20M Fan Dipole for DX March 2012 Modeling an 80/40/20M Fan Dipole for DX Page 2 New Station ~ New Antennas! • Bought a 2nd home in Harpswell, ME, in 2008 • Need HF antennas on 80/40/20 to understand local conditions • No tall trees -- did not want a tower • Low band verticals make sense - but radials are a lot of work. 38’ ½ lambda 0. I am using a home brew ladder line with wire spaced 4 inches apart. 26 - Linearly Loaded Tee Antenna. The antenna was created for the 40 meter band and above. For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. I thought it might be fun to follow this project as I have friends who have the same need. Allocca, WB2LUA, www. Homebrew; Meeting Minutes; Miscellaneous; SSTV; Recent Posts. I apologize for the poor photos of the SWR chart, but I just got my AA-30 analyzer, and discovered it does not save for later review, so I had to take a photo of the screen to get this… I added the band. For the most part, this is true. A fan dipole, like any other antenna, is a compromise antenna. Multiband "Fan" Dipole - click for a larger image and more details. It's ideal for portable or tactical use and can be easily installed in attics, small lots or Covenant Condition Restricted locations. Came across this somewhat stealth multiband dipole antenna project. Fanned 80-40-Meter Dipole Dimensions and Modelled Performance at 50′. It will work well on 2m but has a problem on 70cm because of interaction between the two dipole elements. 4 cm for North American channels 11 and 16. This is a nice fan dipole drawing from YC8PVU. Delta Loops for HF "You'll love lower noise and relative gain over a dipole's ears" Stephen D. – May be difficult to thread through trees. Homebrew 40 meter dipole in the attic. The Low Dipole: To enhance NVIS radiation "straight up" for regional comms, it's useful to deploy a half wave wire in the near-field, on the ground under the half wave dipole to serve as a reflector. It can be stranded or solid, bare or insulated. All Antennas, Magnetic Loops, Portable. Wideband Dipole Antenna 15 23. 75 METERS = 57. The Jetstream uses a voltage balun that looks OK for 40 Meters and up, but W8JI does not review it. 20 - Multiband Tuned Doublet Antenna. Tactical and fixed HF dipole antenna system , 1. Smarter, stronger and more elegant all-band ham radio antenna option. Reply Add to a kit Share Facebook Twitter Pinterest Copy Link. This antenna works quite well no issues. NVIS Fan Dipole Tribander I would like to try this as a folded dipole at 20', no tuner, raised ends. Anyway, have a look at the blog. Buckmaster 7-Band OCF Dipole Antennas are 135 feet (41 meters) long and work on 80, 40, 20, 17, 12, 10, and 6 meters. 75m above "real" ground with a conductivity of 5mS/m and a dielectric of 13. Posted by yf1ar at Thursday, October 20, 2011. The Short Dipole "On Coils" There is very popular method of making a short dipole ("physically shorter than normal" half-wave dipole) resonate at a given frequency. 40m center loaded vertical antenna – 5 metres long Andrew VK1AD / 15/06/2014 I have plans to activate Pigeon House Mountain VK2/SC-033 – Morton National Park in the coming weeks. A feedpoint insulator/connector, with a balun if you are feeding a balanced antenna with coax (e. I am eager to Building a 40 Meter Rotatable Dipole. That works out to dipole lengths of 70. 0 Inches for one side. This dipole kit may be assembled to cover any 4 bands. Available from these sellers. This type of antenna is suitable for single band, narrow bandwidth use. No-Trap 80-40-20-15-10 meter dipole or inverted-V. A fan dipole is a set of dipoles for different frequencies all tied together at the feedpoint. Very Low loss & high-performance for ham radio 80-6M. The vertical dipole’s noise floor was S3 (-106 dBm 3 kHz BW) which is good. fan dipole - Google Search See more. Once again the antenna was shipped and received with in a few days. I'm sure that is possible with 5W QRP and a wire, but the thought here is to build a reasonable QRO DX station essentially from scratch. The dipole was invented by Heinrich Hertz around 1886. 5 kW PEP balun. Multiband “Fan” Dipole, aka: The Ramsay Dipole Yes, it was named after the potty-mouthed chef – The F-word… Yes, that one.