One separate dipole for each band. net) This 40-10 meter portable antenna uses switches to disconnect sections of the antenna for 20-10 meter operation, and clip-on inductors to extend operation to 30- and 40-meters. The 20 and 15 meter dipoles worked fine with VSWR under 2:1 across the band. The larger the wire, the wider the bandwidth. This month I am describing a takeoff on the same idea. 8 15 & 17 meters swr 2. It is an excellent all-around 40 meter antenna for those who don’t have room for (or can’t afford) a yagi, but want more than an inverted V. It is a very efficient antenna that will work from 80-10 meters if used with the above mentioned dipole length. Holding true to the original Windom formulas, I used a ratio of 37. An inverted vee with a 40-foot (12 m) apex elevation requires only 115 feet (35 m). The SuperLoop 80® is an outstanding performer on all bands, 80 - 10 meters. An Attic Coaxial-Cable trap dipole for 10, 15, 20, 30, 40, and 80 meters W5GI Mystery Antenna W5GI Mystery Antenna is a multi-band wire antenna that performs exceptionally well even though it confounds antenna modeling software. Off Center Fed Dipole/ Windom Antenna OCF8010E-3K 80-10 Meters Rated at 3KW MFJ-17758 Dual Band 80/40. They cover all bands from 80-10 meters with a wide range antenna tuner. how to build a dipole antena The simplest and easiest way to produce antenna for hf. 10 Meter Wire Antenna Sizes. Oh…you can use the 40-meter dipole on 15-meters without modification. You only need 16. 092 wavelength long -2Rr decreases approximately as 1/(length) -So Rr is approximately 5 ohms -With 10 ohms ground loss, the efficiency is 33% - Assumes no trap/inductor losses (trap loss could add 2dB) -Now your 100 watt transmit signal results in only. It comes in 300, 450, and 600 ohm impedances. Product Details. Get it as soon as Fri, Aug 9. Plugging this in to the formula (468 / 7. 15 and 10 meters were short enough to hang at other angles in the yard, but 80 and 40 only fit running the length of the driveway. That was used before I had the beam. Double Bazooka NVIS Antenna Calculator. 400mhz but should cover most of this 200khz spread with low SWR. They all work just as well as a center fed dipole. Last year I put up an OCF, cut to the length of an 80-meter dipole. It will work at 20' but 30' produces a much better radiation pattern. The End Wire Size can range from 16 AWG to 12 AWG. The Top 5 Backyard Wire Antennas (in no order) by L. fullwave dipole when driven at the center will display a typical ½ wave dipole pattern being directional broadside with null off the ends. The upper part of the band, mostly used for voice, is often referred to as 75 meters, since the wavelength is between 80 and 75 meters. Both sides have the same dimensions. There are 10 low angle side lobes providing DX radiation in several directions, and further 3 high angle NVIS lobes. I put up another se­parate du­al band an­ten­na for the new bands, now that I had a rig (FT-950) that cov­ered them. The measurements below are for building a simple Dipole Antenna. The roof on the building is not that big that I could install a full size dipole or inverted V. 80 (foam dielectric): Formulas. The JK801 is a motorized inductor coil loaded as well as end capactively loaded rotatable dipole, with a small footprint, giving great performance on 80M. It is a very efficient antenna that will work from 80-10 meters if used with the above mentioned dipole length. Front to back was 20 to 24 dB. 1 and 14 MHz, respectively. 80 meter loop frequency plot The table above makes it fairly easy to choose the feedpoint impedance for the 80 meter loop antenna. 92m from feedpoint to trap, 7. 80 one side. The SWR plot for an 80 meter broadband dipole is shown below. It's performance compared to the dipole has been very impressive. 15M requires an antenna tuner. The Off Center Fed Dipole – by Dan, N5AR. The main category is Multiband Antennas that is about Multiband Antennas. February 7 of 2010 was a quiet Sunday. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. 5/5click here to see their performance reports. It can be fed with standard 50 ohm coax. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. This will give you the length of each leg of the antenna. Buxton, W8NX in QST July 1992 Issue. HyEndFed multiband 80-40-20-(15)-10 meters band antenna. us, especially on 40, 80 and 160 meters. Most of this article has dealt with the use of this antenna on 80 meters but it goes without saying that if you are actually running your antenna through a good antenna tuner, you can cover all ham bands from 160 - 10 meters and all the frequencies in between. I recently helped a friend of mine (a Short Wave Listener) install dipoles for 80, 40, 20, 15 and 10 meters, and his home is in a deed restricted area. A single wire with high performance on 160, 80, 40 & 30 meters DX-CC No-Trap 80-40-20-15-10 meter dipole or inverted-V. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. All information, images, and documents on this website are the sole property of Hygain Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from Hygain. Any antenna tuned for 80 Meters should also work on 20 and 10 meters as well. Amateur Radio. With the AV-680, you get the same great traditional performance of the AV-640 on 6 through 40 Meters plus top-to-bottom capability on 80 and 75 Meters. A dipole antenna is one of. by Abdul-Wahab April 25, 2019 Abdul-Wahab April 25, 2019. The OCF-3K80 dipole will work well on the 80 40 ,20, 17,12 and 6 meter ham bands without an antenna tuner. Prototype #2 was a "4 Band" ( 40 - 30 - 20 - 10 meters) antenna. The antenna itself is 3. It can be fed with standard 50 ohm coax. You have to cut a dipole for resonance on each band (hence the fan dipole - google it). The antenna works on the bands as advertised with low SWR. I have previously made other trapped dipoles using the standard coax-trap design. It`s a great way to join new local nets and roundtables, explore the 75-Meter DX window, or add exciting digital frequencies to your operating repertoire. Each sloping dipole element would measure 68. With your tuner bypassed, use either an antenna analyzer, or your radio’s SWR meter, and measure the SWR at various points throughout the 80 to 10 meter bands. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. A low frequency dipole (80/40 meters) can be put up to within 10 feet or so under a higher frequency (20/15/10 meters) beam with little if any problems. moved to VK1HW. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Dipole Easy and cheap to build, can be made with small gauge wire •20 meters and above or 80 meters and above •Radials required to 10 meters (one band at. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. On 20 meters I get an swr of less than 1:5-1 in all of the general class band and have tuned 10 meters on this antenna with no problem…alll in horizontal dipole config. 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. This antenna requires a 4:1 Balun. At higher frequencies, up to 30 MHz, its gain matches the dipole’s. Eh antenna plans. , 80, 40, 20, 10 meters. NewSuperAntenna is the Official Super Antenna Systems Corporation website. Amateur Radio Supplies offers this multi-band dipole available in two different versions. Advanced Search Efhw vertical. ) It must be made of durable, high quality, weather worthy components. and 10 meters, and the other covering 80, 40, 17 Trap operation, all turns are used, in the con- ventional manner for a trap. 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. That's probably an oversimplification, but unless the folks you want to talk to are fairly close, you do really need a low angle of radiation on that band. 14 copper for the wire element. 5 SWR, calculations showed this would require a cage of almost 6 inches. 5:1 balun or a choke. 500 MHz, I came up with a total dipole length of 137. high 40 Meters (7. Lengths are given in feet, inches and fractions of inches, and in meters. Other bands are possible with an ATU. A low frequency dipole (80/40 meters) can be put up to within 10 feet or so under a higher frequency (20/15/10 meters) beam with little if any problems. Add to Bag. It is easily demonstrated that antennas most readily detect electromagnetic radiation incident from those directions in which they preferentially emit radiation. One separate dipole for each band. Off-Center-Fed Dipole, OCFD, Windom, 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. For local and regional HF, I usually use a double dipole with legs for both 40 and 80 meters (and sometimes including 60 meters), fed in parallel from the same feedline. This 40 and 80 meter inverted V antenna is made with loading coils. Variable 60-80 Resonator; DPM6000A Precision Power Meter; Update: While not marked on the controller, the usable range of the RATE control is from approximately the 10 o’clock position to the MAX position with the knob CW position indexed at MAX (see the figure at right). 8 MHz) – 43. All OMs owning a plot of 400 sqm or bigger are in the position to built a full size loop antenna for 80 and 40 m. It is an excellent all-around 40 meter antenna for those who don’t have room for (or can’t afford) a yagi, but want more than an inverted V. So the plots are taken with only the top 1/4 wave transformer and the 7 meters RG316 below, giving a feedline total of 10,6 meters. The antenna is resonate on both bands and does not require an antenna tuner. 5 MHz, its gain is 3 dB higher. The Buddipole Quick-fix for NVIS on the Lower Bands One of the best and most-used antennas for NVIS, or Near Vertical Incidence Skywave, is a dipole low to the ground. by Gene Preston, K5GP I read Rick Littlefield's article in the June 2008 issue of QST on off center fed dipoles and was intrigued by the idea that the antenna could be extended to cover 80 meters. The ability to transmit of multiple bands without needing a tuner (and even more with a tuner) is a very desirable factor in choosing a versitle antenna for HF. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. Also covers 30-17 & 12 meters with an antenna tuner. The 80 meter band was made available to amateurs in the United States by the Third National Radio Conference on October 10, 1924. I put up another se­parate du­al band an­ten­na for the new bands, now that I had a rig (FT-950) that cov­ered them. The above graphic depicts the overall layout of the loop antenna consisting of 558 ft. A dipole antenna is one of. You probably should not solder this loop to keep the wire flexible. 10 meters per side. Wideband Dipole for Receiving 16 24. 80 meter loop frequency plot The table above makes it fairly easy to choose the feedpoint impedance for the 80 meter loop antenna. Trap Capacitors. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. This antenna was modified from my NB6Zep antenna whose plots can be found here. 25, rising gradually to 2. I have a 160 – 80 – 40 meter dipole up right now using his traps and conventional measurements between the traps and it’s working great. 10*10^-9)( 3. I made up an 80 meter dipole to use once it got dark. Only at eHam. Emergency Amateur Radio Club, Honolulu, HI - Homebrew Projects. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. Random Length Radiator Wire Antenna. Here we have my design for an Off Centre Fed Dipole. The Antenna Consists Of A Half Wave Length Antenna on the Lowest Frequencey to Used, With a "Single Wire Feeder" Connected Off Center. The dipole was modeled at various heights from. Now it's time to extend the Fan with more bands. The Wire Size can range from 16 AWG to 12 AWG. Now you can operate the low bands on 80, 40, and 20 Meters with a true rotatable dipole that blends in with the sky! Take advantage of the excellent propagation of the low bands during the low sunspot cycle. It includes the popular 10-, 15-, 20-, 40-, and 80-meter bands. This 40 and 80 meter inverted V antenna is made with loading coils. By John Portune W6NBC. How does the hexagonal beam compare with a dipole? The dipole is actually a pretty good antenna. 7% wavelength antenna height for each band is listed here: 80 Meters (3. Making it a resonant antenna for all bands from 80m to 6m (except WARC bands). The starting formula for the folded dipole calculation is the same as a dipole, 468 / Frequency (in MHz). My 50 foot tower in the background next to the house supports my triband rotatable dipole and two 2-meter beamsone vertical and one horizontal. 2x10 M (2x33 FT) MID-LOADED DIPOLE. The orig­i­nal Jet­stream Multiband 80 - 10 Dipole nev­er had cov­er­age of th­ese bands. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] by Gene Preston, K5GP I read Rick Littlefield's article in the June 2008 issue of QST on off center fed dipoles and was intrigued by the idea that the antenna could be extended to cover 80 meters. First, I used a perfectly tuned 80 meter dipole to add the 40 meter antenna under. On the higher bands, it works much better than a dipole. 400mhz but should cover most of this 200khz spread with low SWR. The gain is around 4 dBd on 40 mtrs, but it will seem much higher due to the very low angle, radiation pattern. But my old CB base antenna I had is long gone and I had always wanted to see how a vertical dipole antenna would work. 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. MFJ 1778 G5RV 10-160 Meters Wire Antenna,10 - 80 Meters As Dipole 160 As Marconi. Steel Slinky Dipole. I have to shorten it. 3 entire band 15 meters: 21. On tests it is comparable to a full size dipole at similar height for DX working. NA7U's All-Band Doublet (80-10 Meters) based on L. A single wire with high performance on 160, 80, 40 & 30 meters DX-CC No-Trap 80-40-20-15-10 meter dipole or inverted-V. But my old CB base antenna I had is long gone and I had always wanted to see how a vertical dipole antenna would work. Other bands are possible with an ATU. The main goal of this work is to design an UWB antenna for underwater communications and its applications. T2FD -- The Forgotten Antenna. The Top five list contains a few antennas that if you have the room for them perform very well. An in-line balun takes care of potential feedline unbalance and radiation problems. You only need 16. 19 one side. One big consideration was weight, 4 cage dipoles for 40/30/20/10 uses almost 1,000 feet of wire. All measurement equipment used is NIST traceable. Vertical Dipole 12 17. 5/5click here to see their performance reports. The OCF-3K80 is complete with a 4 to 1 -- 3000 Watt continuous duty 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. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. Only 3 left in stock - order soon. Order 7-Band 100 Watt QRP (low power) OCF Dipole. 667 feet long, and the other leg 91. 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 125' Dipole 50' Feedline; 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 125' Dipole 50' Feedline. A Broadband 80/160 Meter Dipole An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band. Works with all HF bands. The 10 meter version has been installed midway up a 45 foot tall Rohn galvanized steel mast braced against the rear deck of my home, and further supported by six light weight 1/8 inch double braided Dacron guy ropes. 5 MHz, its gain is 3 dB higher. It utilizes an internal 9:1 UnUn and a BNC female antenna connector. The main goal of this work is to design an UWB antenna for underwater communications and its applications. The main category is Dipole antenna that is about Dipole antennas plans. Contact one of your local Diamond ® Dealers for current price & availability. The random length all band dipole represents some clear advantages in cost and operational flexibility within the limitations of the average Australian suburban block. I find that it works reliably on the frequencies above 80 meters with only two walls connected as a dipole. The measurements below are for building a simple Dipole Antenna. This 10 meter dipole project will enable you to start using your new HF privileges as a Technician class operator on 10 meter SSB between 28. I wanted to change things up and try working a different band other than 40 meters where I have operated the past few Field Days. Getting out of the ham hobby, short wave multi-band trap dipole antenna. Tilted Folded Dipole Antenna 16 25. The RadioWavz DX (OCF) Windom is ideal for those of you who do not use a tower and beam. The formulas for calculating the approximate length of a full-wave loop antenna are: Full-wave loop in feet = 1005 / frequency in MHz; Full-wave in meters = 306 / frequency in MHz. Caged Fan Dipole Project. Radio Oasis G5RV Standard 80 - 10 Meter Amateur Radio Antenna. The ten meter band was very noisy at my location and no contacts were made. If you measured the SWR of a 80 meter dipole with the same meter and same dipole, but in one case through 300 feet of RG-58 (more loss), versus 50 feet of RG-213 (less loss) you would measure two different SWR curves. Dr-Dipole (Also Known as SAT Antennas) have been building Simple Dipole Antennas for people for many years. Multiband operation is an option. Other bands are possible with an ATU. by Abdul-Wahab April 25, 2019 Abdul-Wahab April 25, 2019. Dipole Easy and cheap to build, can be made with small gauge wire •20 meters and above or 80 meters and above •Radials required to 10 meters (one band at. Fortunately, that fact tends to level the playing field for most hams on 80 meters. Now that I think about it, the first dipole was more like 70'. 43-foot vertical for 160-20 meters, and a Hy-Gain TH-1 rotatable dipole for 20/15/10/6 meters, as this dipole normally outperforms my vertical on the higher bands. how to build a dipole antena The simplest and easiest way to produce antenna for hf. MFJ-1778 G5RV, WIRE ANTENNA MFJ-1778 G5RV, WIRE ANTENNA WITH 100' OF 100% DACRON POLYESTER ROPE The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. For local and regional HF, I usually use a double dipole with legs for both 40 and 80 meters (and sometimes including 60 meters), fed in parallel from the same feedline. I noticed two things. This article describes a specific procedure to adjust a shunt matching coil to assure that the input SWR will remain relatively low (≤ 1. Radiation pattern of a Vertically Oriented Buddipole™ on 7. 80 to 10 meter short TV Twin-led dipole By Bruce Randall, W1ZE In last months issue of Squelch Tales I described two short dipoles (Doublets) that work on the 160 to 10 and 80 to 10 meter bands with the use of an antenna tuner with a balanced output. Fan dipole has several dipoles with a common feedpoint. THE 20 METER MONOBAND DIPOLE THE 10 METER MONOBAND DIPOLE THE 60 AND 30 METER DUAL BAND DIPOLE. A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. This link is listed in our web site directory since Friday Feb 6 2015, and till today "10-80 Slinky Dipole" has been followed for a total of 1054 times. This will give you the length of each leg of the antenna. A Broadband 80/160 Meter Dipole An easy to build single wire antenna for 160 and 80 meters with a better than 2 to 1 swr across the 80 meter band. net is a Web site dedicated to ham radio (amateur radio). HyEndfed products online from ML&S Martin Lynch & Sons. The MFJ-1778 (G5RV) consists of a 102 foot flat top fed with a 32. My first test was to have 80 and 40 meters on one dipole. It's performance compared to the dipole has been very impressive. A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. Let's try an example: Design a folded dipole for the 40 meter band. The bazooka worked well but was a single band antenna and I would replace it after any 160M contest with either a Carolina Windom or a 80M delta loop. The Technician class has access to a part of the 10 meter amateur radio band. Ham Radio and Amateur Radio online equipment sales. The RG-58 version would appear to have a broader SWR bandwidth. Like the previous models, it covered the 80 through 10 meter amateur radio bands on Single Side Band or CW at 100 watts, and was one of the most popular of Heathkit's ham radio products. 8% for one side and 62. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. 5 across both bands. The 160 meter band vertical antenna is tunable with an impressive 40 kHz bandwidth. The outside of the coax and the ladder line operate as a half-wave dipole. Generally, 45 degree inverted Vees are the best compromise. On 40 meters this antenna configuration offers reasonable DX performance with a take-off angle of 27 degrees for a center height of 10 feet. The fishing poles should be as long as possible. In the drawing above, it is shown for just four bands, 80 thru 10. Buckmaster OCF Antennas are made from the best quality materials and are designed to give you years of trouble-free service. On 20 meters I get an swr of less than 1:5-1 in all of the general class band and have tuned 10 meters on this antenna with no problem…alll in horizontal dipole config. DX-LB Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. The All Band HF Doublet - 80 thru 10 Meter Ladder Line Multiband Antenna Fan Dipole shown on Ham Universe. Its broadband characteristic makes it ideal for 80 meters and 10 meters. A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. The solution : build an antenna for 40 and 80. To remedy the narrow bandwidth I used a bowtie dipole antenna for 10 meters. This page is dedicated to those who have built this antenna, sent emails and photos. In other words an 80-meter Windom 137 feet long would have one leg 45. 80 one side. We supply two 5 ft whips to cover 10 through 80 meters. • The effective radiated power limit in the 60 meter band is raised by 3 dB, from 50W PEP to 100 W PEP, relative to a half-wave dipole. 5 858 160-80-40 trap dipole @ 50 feet K9DRP 12 12 24 10 240 x1. As the fishing poles I had lying around were 8. *For this article a vertical refers to a 1/4 wavelength, ground mounted antenna with 1/4 wavelength radials. The SuperLoop 80® is an outstanding performer on all bands, 80 - 10 meters. The dipole is customarily an electrical half wavelength of wire at the frequency of interest, since the impedance under this condition is theoretically 72 ohms resistive and is a good match to a 50-75 ohm source or load generally presented by interfacing equipment such as receivers and transmitters designed to work into this range of impedances. A good choice is a dipole at 50 feet and a small Yagi at 100 feet A small triband Yagi for 20, 15 and 10 meters A small Yagi 50 feet high produces competitive results at 1500 miles A small Yagi 80-100 feet high is excellent for 1500 miles or more two stacked triband Yagis at 40 and 80 ft produces excellent results. Special page devoted to. Local 2-Meter DX Spots use for DX voice spotting 145. TAK-tenna markets and sells a 40-meter antenna that is a unique arrangement of a simple dipole where the quarter wave sections are wound into flat spirals instead of being arranged in a straight line. With 10 metres being open most days world-wide, why not try a simple ten metre dipole. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. 80 Meter Pre-Assembled, Heavy Duty Dipole Antenna. I have previously made other trapped dipoles using the standard coax-trap design. The JK801 is a motorized inductor coil loaded as well as end capactively loaded rotatable dipole, with a small footprint, giving great performance on 80M. The next photos show the 10 meter dipole installed and ready for use. My first dipole antenna. The G5RV antenna is a multi-band center-fed dipole antenna capable of 1500 Watts. I wanted high efficiency 40 Meter antenna with low-angle radiation. The dipole is customarily an electrical half wavelength of wire at the frequency of interest, since the impedance under this condition is theoretically 72 ohms resistive and is a good match to a 50-75 ohm source or load generally presented by interfacing equipment such as receivers and transmitters designed to work into this range of impedances. View the brochure for JTG5RV View the manual for JTG5RV 102' overal length 10-80 meters with antenna tuner Fully assembled 100' of rope included Built with Jetstream JTCE3G center insulator w/strain relief Stranded 450 ohm ladderline 14 gauge stranded antenna wire. Off Center Fed Dipole/ Windom Antenna OCF8010E-3K 80-10 Meters Rated at 3KW MFJ-17758 Dual Band 80/40. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. The JK801 is a motorized inductor coil loaded as well as end capactively loaded rotatable dipole, with a small footprint, giving great performance on 80M. 8% for one side and 62. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. The band was allocated on a worldwide basis by the International Radiotelegraph Conference in Washington, D. Note:- The current’s amplitude changes as the impedance of the antenna changes with frequency. This 10 - 160 meter tuned horizontal loop antenna is fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner. 7 20 meters 14. end fed dipole 80-6 meter portable hf antenna matchbox system. 34 x 10-30 coulomb-meters). The best performance of this dipole is achieved at approx 130Ft or higher. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. This link is listed in our web site directory since Friday Feb 6 2015, and till today "10-80 Slinky Dipole" has been followed for a total of 1054 times. HF Antennas for HF beginners - 30 Meters and Below 3 Wire diameter is not critical but 12 and 14 seem to be the most common. Here are my SWR results: 10 meters: lowest at 28. The antenna is resonate on both bands and does not require an antenna tuner. Title: Radio Tips: The Monoband HF Dipole Antenna Created Date: 3/2/2000 11:15:45 AM. I tried to wind the coil to my best knowledge of that language. 1 and 14 MHz, respectively. I found some other sites that described this version of the antenna a lot better but I can't remember the url's for those. It features high-performance traps, heavy wall tubing, and rugged hardware for years of enjoyment. A loop fed in the southwest corner will have a few dB (3dB or more) gain favoring the northeast corner. If you live on a farm and have lots of time and money to spend on your low band antennas, congratulations… For everyone else, an antenna on the 80 meter band will be a major compromise compared to what we might have for other bands like 10 meters. 5 across both bands. The ten meter band was very noisy at my location and no contacts were made. W3DZZ Multi-band Antenna 80-40-20-15-10m N. 6 MHz) – 45. 5 858 160-80-40 trap dipole @ 50 feet K9DRP 12 12 24 10 240 x1. Terminated Wide-Band Folded Dipole Topics: antenna, dipole. By Richard A. MFJ 1778 G5RV 10-160 Meters Wire Antenna,10 - 80 Meters As Dipole 160 As Marconi - $69. For the HFp Dipole, the element length is set according to the element chart in the Dipole instructions. Steel Slinky Dipole Antenna 10 to 80 meters band. 5:1 balun or a choke. The Hy Power OCF80 80 meter version shows a positive SWR dip on the following bands: 6, 10, 12, 17, 20, 40 and 80 meters. I've used the PAR/LNR end fed half waves with great success on 40, 20, 17 and 10. Since Bill did not believe in balans his antennas would accept all the power. With 10 metres being open most days world-wide, why not try a simple ten metre dipole. Full size dipole for 160 meters @ 268 feet long. You are bidding on a used Offcenter Dipole antenna , scratches and nicks from normal use. It is a half wave dipole designed for the center frequency of 28. At higher frequencies, up to 30 MHz, its gain matches the dipole's. The longest dipole that I can fit on my terrace, albeit with a dog leg between the dipole halves, is 2 x 10 m (2x 33 ft), i. Terminated Folded Dipole antenna (TFD) that covers from 80 - 10 meters continuosly without a tuner. Radioteletype is used frequently on this band as well. 400mhz but should cover most of this 200khz spread with low SWR. 6:1) over the operating range of an 80 through 10 meter, remotely-controlled, HF mobile antenna. 40 through 10 meters: a horizontally polarized dipole, Yagi or quad easily provides 6 dB of ground gain but only if it is installed at the correct height 80 meters: If you cannot install a horizontal antenna at 25 meters high or higher: use a vertical or a vertically polarized delta loop (corner fed), or. I upgraded the dipole by adding a home made 1:1 current balun and added a 20m dipole wire as well. For this reason the 40 meter section was left a little long so that when the 80 meter section is the correct length, the 40 meter section resonates on the desired frequency. The SuperLoop 80® is an outstanding performer on all bands, 80 - 10 meters. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. In fact, about 12 acres of them. Off Center Fed Windom Style Dipole Base Station Antenna With A 4:1 Balun. It can be fed with standard 50 ohm coax. This 40 and 80 meter inverted V antenna is made with loading coils. Add to cart Details. View Cart My Account About Us Contact. Radiation pattern of a Vertically Oriented Buddipole™ on 7. If it is a straight dipole, fed with coaxial line, what frequency is it cut for? Or, is it a fan dipole? There is no such thing as a dipole for 40 - 10. Figure I shows the configuration of the 80, 40, 20, 15 and 10-meter. With 10 metres being open most days world-wide, why not try a simple ten metre dipole. Unlike trap antennas, there are no capacitors to break down under high RF voltages, and a tuner may be safely used for multi-band operation if desired. Antennas for 10 meters are small and easy to build. (it is best if you know your neighbours below. Designed as 3/2 wavelength antennas for 14 MHz, they provide reasonable performance on many other bands.