80 Meter Dipole

There for if you can have only one HF antenna the random length all band dipole would be a pretty good choice. Covers all bands, 160-10 Meters with antenna tuner. One compromise antenna I have used is a trapped dipole. If you want to use a dipole for a band of frequencies, you cut it to the center frequency on that band, and hope it has a low enough SWR at each end of the band. Installs like an Inverted-V with ground return accomplished thru tower or down-lead. 160M Is a Tough Band • Propagation quite variable, signals often not very strong, heavy QRN during the summer –Mostly a nightime band, varies a lot through the night –During the winter, 800 miles or. Dave Tadlock, KG0ZZ, has a number of YouTube videos showing how to build antennas. 20 meters swr 1. This wire is an inverted L with about 25feet hanging vertical and the rest horizontal. We supply two 5 ft whips to cover 10 through 80 meters. Construct a compact, 20 meter rotatable dipole antenna of durable weather worthy components supported at a single point obviating the need for multiple supports and multiple support ropes crossing the yard. 12 meters is like 1. It's hard to site an antenna for the forest full of trees. Since Bill did not believe in balans his antennas would accept all the power. Construction techniques are not critical. Fact is, the average commercially-manufactured, HF mobile antenna is about 1% efficient on 80 meters. Simply trim the antenna so that the maximum SWR of 1. Do you need an antenna tuner? Nope. Just a brief description, my base station consist of a 100 watt rig that goes to a parallel dipole for 10, 15, 20, 40 and 80 meters. The second antenna is an absolutely deadly sloper that is a mere 34' in length and requires just 25 to 30 feet of support height. In other words, 100 watts might go in, but only 80 watts are radiated. Shop with confidence. Cebik's 88 foot backup doublet. 42 CQ Say You Saw It In CQ December 1989 The K8UR Low-Band. Most of us humans think an element that long is difficult to build an rotate much less keep up in the air reliably even for a single winter. A-4 Correct Wire Splice 46 Fig. The Antenna was modelled at 10m above the REAL Ground whose Conductivity=5mS/m and Dielectric = 13. although it seems the to be improved performance in 80 and 40 meters and 20m. full-size, half-wavelength, horizontal, broadside dipole on every band from 160 through 10 meters. I read a nice article by A. us, especially on 40, 80 and 160 meters. Cebik, W4RNL. They say that 80 meter dipole would tune all bands with tuner just like the G5. After testing over ten different antenna configurations we decided on a couple that worked well for our needs. That could perhaps work well for NAQP and Sweepstakes. 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. MFJ-1775 Rotatable Mini-Dipole Instruction Manual 1 MFJ-1775 PARTS LIST As you unpack your antenna you should find the parts in the following list. Tilted Folded Dipole Antenna 16 25. The 80 metre trap as a closer view. 1- Sloping dipole polar plot of radiation angle with 120 foot tower support. Your radio is 50 ohm. dipole, depending on how much extra length (with the 80m traps) I need to add to get it to resonate on 160m. 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. This pattern will reverse when the feed-point is moved as little as 5% off center. 40 Meters Wire Yagi - Inverted Vee Elements A wire yagi made with dipole elements has the disadvantage of requiring multiple supports. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E [email protected] This allowded full band operation without an antenna tuner. This means I should give some consideration to putting in place a 1:1 balun for using the antenna for the low bands, where it no doubt acts more like a low hanging dipole. 40 80 meter dipole antena , I tried to work with this antenna in 15 meters and it worked great. You can feed your dipole with coax, as already mentioned above. Based on a dipole model, removing about 8 feet of wire should bring it right in. These 2 dipoles are at right angles to each other and the 20/15 dipole is located about 6 feet below the 75/40/20 fan dipole. K8UR shows us how to modify a sloping dipole to make an effective contest antenna. The Short Dipole For Multi-Band Use. And that’s all there is to it! This is a great first antenna! Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. Since Valor went under I don't know of anyone who makes a 160 Meter "hamstick" style of antenna so, I made one. 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. 3 swr at either end of the band 80 meters at 3. Both sides have the same dimensions. 000 Power Rating 2kw Antenna Lengths 10 Meters each leg 9 ft. Using the popular trap-type antenna on 75-80 meters, the overall length usually exceeds 100 feet with an extremely narrow operating frequency range. The loop really, really cuts the mustard on 160, 80 and 40 meters compared to a dipole at the same height. I measured a certain distance across my floor and then figured out how many times I had to go back and forth to get my total length. 5:1 is at 4. Lengths are given in feet, inches and fractions of inches, and in meters. 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. END-FED HF Matchbox Antenna. It is a full size antenna on 40 meters and a shortened 80 meter antenna. 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. It means that a single vertical for the 80 meters band asks for 13,520 square feet, while 160 meters will demand nothing less than 1. Since an 80 meter dipole is approximately 130 feet long, and a 160 meter dipole is approximately 250 feet long, this space reduction can be critical in getting the antenna to fit into our typical backyards. Example — 80 meters: If you are operating on 3. The good news for CW fans is simply cutting the dipole a bit longer will give you full coverage from 3500 to 3600 kHz. Just change bands on the radio from 40 to 80 meters and transmit. The 40-meter loop had been removed to make way for a family garden in the back yard. Double Bazooka NVIS Antenna Calculator. 160 Meters each leg 126 ft. Sign in | Report Abuse | Print Page | Powered By Google Sites. Making it a resonant antenna for all bands from 80m to 6m (except WARC bands). This was a spur of the moment project. The antenna works with a tuner on the other bands 80 meters through 6 meters, and I run an SB220 on 80 meters for the Missouri Traffic Net. Free Shipping - $139. 160-Meter Dipole Height N0GW - Gary Wescom - 1 Nov 2006 During the current lull in solar activity, operation on the 160 meter ham band has become more popular. 8 dB lower - Much less SWR bandwidth - Greater feedline loss away from resonance Build or Buy a Short. Figure 7 shows the 80 meter SWR curve with the antenna analyzer cen - tered on the low SWR point. The dipole is constructed using top quality, Poly-STEALTH 13 Breaking strength 370 lbs. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. These 2 dipoles are at right angles to each other and the 20/15 dipole is located about 6 feet below the 75/40/20 fan dipole. Handles 1500 Watts. 80 Meter Band Dipole Antenna Minggu, 14 Februari 2010. On the right is the 40 meter SWR plot. Carmel, Tn. MFJ-1775 Rotatable Mini-Dipole Instruction Manual 1 MFJ-1775 PARTS LIST As you unpack your antenna you should find the parts in the following list. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. The loop really, really cuts the mustard on 160, 80 and 40 meters compared to a dipole at the same height. Place a 1:1 Balun on the Antenna end of the Feedline. You can feed your dipole with coax, as already mentioned above. It is a full size antenna on 40 meters and a shortened 80 meter antenna. 16 feet over all. After trimming, the 80 meter elements were about 4 feet long for a total antenna span of about 76. Alpha Antenna 10-80 meter Alpha 31 Foot Portable & Base antenna [AlphaS9Antenna31foot] - 10-80 METER ALPHA 31 FOOT PORTABLE AND BASE ANTENNA Overview: This 31 foot antenna is a tough ultra-lightweight (3. This configuration is ideal for medium range 80 meter contacts and it is a reasonable performer for working DX, in spite of its compact size. 5:1 or less!. Performance is excellent. The circuit shown has been used with a center fed (open wire) 80 meter antenna having the following configuration. The WX was fairly good enough in early March and so I decided to give it a try. It was a 40 meter Carolina windom. Plugging this in to the formula (468 / 7. 9 MHz in Regions 1 and 3 (the rest of the world) respectively. 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. In the handbook the specifications for this antenna indicated it would' work on all of the bands above 80 metres also, that is 40 - 30 - 20 -17 - 15 - 12 and 10 metres. Most of my casual operating on 80 is on the low end, chasing DX on CW. com 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 starting formula for the folded dipole calculation is the same as a dipole, 468 / Frequency (in MHz). Short 85 foot long dual band 80/40 Meter dipole antenna is full-size on 40 Meters and has ultra-efficient end-loading on 80 Meters. How to build a mono band 80 meter 1/2 wave wire antenna. 333 feet long. Handles 1500 Watts. Covers all bands, 160-10 Meters with antenna tuner. 00 80m Half-Sloper Double-Bazooka Antenna (0) Your Price: $121. Solderless , crimped construction. 40 meters had the 39 Meter shortwave broadcast stations, so at night, 80 meters was pretty much it. Click Here for free End Fed 6 - 40 Meter Matchbox Antenna assembly instructions (tuner required). Place a 1:1 Balun on the Antenna end of the Feedline. 60 meter band is 5MHz is the International Ham Radio band. Dipole Antenna Length Calculator. The ends and the supply line. We supply two 5 ft whips to cover 10 through 80 meters. Title: Radio Tips: The Monoband HF Dipole Antenna Created Date: 3/2/2000 11:15:45 AM. 40 80 meter dipole antena , I tried to work with this antenna in 15 meters and it worked great. The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. They made a passing reference to 15 meter use on the 40 meter dipole. Our best selling antenna is our 160 meter, ruggedized "half-sloper". The call W3DZZ is seen on the plans page I have, so that is where the credits might belong. The Wire Size can range from 16 AWG to 12 AWG. The fact that you are using radiators that are large make it a greater target for high winds, icing, and the like. For good DX performance, the apex of an 80-meter drooping-dipole antenna should be as high as possible above ground (at least 15 meters [50 feet]), because the antenna's vertical radiation angle decreases with height above ground. Using the W7FG Open Wire Fed True Ladder Line Multi-Band Dipole Is Easy! Why use an open-wire fed doublet? Quite simply, they are efficient, broadband, easily tuned with a balanced input tuner, nearly unaffected by rain, easy to erect, stay up, and remain "trouble free" for years. They say that 80 meter dipole would tune all bands with tuner just like the G5. After testing over ten different antenna configurations we decided on a couple that worked well for our needs. Well…I would have quick band changing: The trapped dipole is the way to go!. 80/75 Meter Wire Antennas Halfwave folded dipole is: 128. Because of my limited space I had to think about an antenna that is small enough for my yard without having too much loss in gain and I found such an antenna in the antenna collection of Rothammel "Antennenbuch-Rothammel". 40 Meters each leg 33 ft. 2 to 1 on all of 40 and 1. Dipole Antenna for 40- and 20- meter Bands. Well, 15 meters and 10 meters were great, when the band was open. When I was a novice, (anyone been a ham long enough to remember the CW only novice class?) I could only operate on 80, 40, 15 and 10 meters. - 160/80/40 meter band - trapped dipole - 2007. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. The OCF-3K80 dipole will work well on the 80, 40 ,20, 17,12,10 and 6 meter ham bands with no need for tuning. However if like me you're faced with a small lot or perhaps in need of a stealth multi-band antenna or just want to get on 80 or 160 meters with something that works!. Short antenna so it looks longer to. full-size, half-wavelength, horizontal, broadside dipole on every band from 160 through 10 meters. The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. However, we can reduce the space needed to a quarter wavelength if we decide to use an end fed antenna. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. I started to make the TRAP's: I use 50 m. Many of us on suburban blocks however are space challenged when it comes to erecting a full size 80 Meter dipole. Place a 1:1 Balun on the Antenna end of the Feedline. These will considerably reduce the size of a 160m dipole to 170 feet. Built for Ham Bands from 2 Meters thru 80 Meters. Great for overall use, especially short range. The capacitor C (nominal value 400 pF; effective capacitance ≈ 478 pF at 3. Then I adjusted the L wire until resonance. > >A fan dipole with one. Two 1/4 wave ham sticks in a dipole configuration produce a 1/2 wave dipole antenna. On the 80 meter band, the same antenna has just a small amount less gain than a full size 1/2 wave length dipole at the same height. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. OCF antennas are very convenient as they will allow multiple bands of operation with a simple wire antenna which is fed off center with a 4:1 OCF Current balun with built in feed line choke,. A dipole will work well on frequencies that are an ODD multiple of 1/2 wavelength frequency the antenna is cut for. The 88 footer is a simple concept, a dipole fed with open, ladder, or in this case, about 50ft. Oh…you can use the 40-meter dipole on 15-meters without modification. DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft. 15) gives a folded dipole with a length of 65. however are space challenged when it comes to erecting a full size 80 Meter dipole. 5m at the ends. I was reading about the stick dipole and it stated that the rg-58/u was probably the best for the 80 meter frequency as it had better resistance down there than the larger coax. Your first antenna – the half-wave dipole. Because of my limited space I had to think about an antenna that is small enough for my yard without having too much loss in gain and I found such an antenna in the antenna collection of Rothammel "Antennenbuch-Rothammel". The higher the angle, the lower the frequency needed to work properly. sent out a CQ from my Ten Tec 40 meter QRP rig and had a great conversation with a fellow ham in St Louis, MO. 5:1 or less with the 5 ft whips or using the Scorpion Cap Hats™ for a smaller foot print. Click to see a full size picture. 468 ÷ freq (mHz) = Length (feet). One of the aims of DXers is long distance contacts and they will often go to great lengths to have a low angle of radiation. As the frequency is lowered, the efficiency drops, and rather drastically. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. 80 METER DIPOLE 1:1 1500w SSB/PEP 200w CW (125′ 8″) Item #: 80DP11; Learn More ©2018 RadioWavz Antenna Company 735 Lakeside Plaza Lake Saint Loius, MO 63367. W4RZL also used a multiband scheme for 40 and 20 along with the 80 meter dipole. These have proved very durable when exposed to the elements. There is no grounding or counterpoise needed. 5 inch tubing. Home Made Off Center Fed Dipole. By the way, some dipoles are designed to be used on more than one band of frequencies. End-fed horizontal wire, an EFHW, offers the. Not only can this type of dipole be used horizontally, you can also use it in an inverted-v or sloper formation – perhaps as an 80m/160m version? The overall length of my 40m version is 12m / 40ft for the 40m band. Title: Broad Band 80 Meter Antenna Created Date: 3/2/2000 11:14:16 AM. Brand new · MFJ. 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. Click Here for free End Fed 6 - 40 Meter Matchbox Antenna assembly instructions (tuner required). 5-53 MHz (80-6 Meters) An external tuner is needed for a few bands. The 80 meter or 3. Feed-point Connector for Inverted V Dipole Antenna Click here to get the instructions off his website. Here is my home HF antenna. #1 Falcon 80-6 Meter Off Center Fed Dipole Amateur Ham Radio Antenna is constructed with the full particulars for your appliance in use. A dipole is very simple to build. It will work at 20' but 30' produces a much better radiation pattern. Twenty meters designates the length of the particular radio wave used to transmit and receive voice and Morse code. This allowded full band operation without an antenna tuner. 5 across both bands. The manufacturer suggests trimming for best SWR. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. please note the pictures indicate that almost half of the making. Remember that our 160M and 80M antennas are actually NVIS because most of us have height limitations under 70 feet. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arraignment. 8 dB lower - Much less SWR bandwidth - Greater feedline loss away from resonance Build or Buy a Short. (Note: Support can be 80 to 90 feet tall for 75 meters. This antenna is very stiff and not quickly or easily deployed. I read a nice article by A. prospect, IL. Here is my home HF antenna. The loop really, really cuts the mustard on 160, 80 and 40 meters compared to a dipole at the same height. 7 which is ok and 15. Dipole Easy and cheap to build, can be made with small gauge wire •20 meters and above or 80 meters and above •Radials required •Tuner required •Remote. In the drawing above, it is shown for just four bands, 80 thru 10. The trees are about 80 to 90 feet apart with my house in the middle so it fits the space nicely. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to. However, we can reduce the space needed to a quarter wavelength if we decide to use an end fed antenna. While I was able to tune the 100-foot dipole on 80 meters well enough for 80 meter WAS, performance on 160 meters was sub-par. Easy to install and tune. 5 inch tubing. Let's try an example: Design a folded dipole for the 40 meter band. This review of NI4L's 7 band OCF dipole was prompted by my needing a quick deploy multiband antenna for both field day, and for RVing. Bow-Tie Dipole Antenna 13 19. Factoring in my theoretical coax loss, I’m only getting 87 watts to the antenna. 80 75 Meter Wire Antenna Sizes. But don’t be misled – just because they are easy to make doesn’t mean they don’t work well. The Top 5 Backyard Wire Antennas (in no order) by L. 5 feet (including the coils). Fig 2—Typical N6LF broadband symmetrical half-square for 80 meters. This is usually called a "fan" dipole and works well when tuned for lowest SWR. 5 at 3 and 10 meters (three antenna technique) using NIST traceable test equipment. 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. 60 meter band is 5MHz is the International Ham Radio band. Image info : Resolution:800x571 Size:18kB. 2m long, 3m from trap to end, and the capacity loads have a radius of 0. Tune single sloping and elevated radial for resonance. 80 Meters was actually 1. The antenna can be mounted as a simple dipole or inverted veeThe OCF-3K40 is complete and ready to install. MFJ 17758 40 & 80 Meter Dipole 1. Because my back yard is rather small, I haven't been able to erect a decent 80 meter dipole antenna. although it seems the to be improved performance in 80 and 40 meters and 20m. Being that I was building a 10 thru 80 antenna ( if you remember it was a 40) I had to. It's easy to see why since I was operating with a dipole only 25 feet above the ground - a fraction of a wavelength on 160 - which meant that most of my signal was going up, not out. Only at eHam. The HAMinator 10-80 - Rotating Dipole Kit with Antennas, Mount and 25' of RG-8X Coaxial Cable Provides all you need AND Saves you money!! Kit Includes: 10 - ProComm PCF Series Fiberglass "Stick" Antennas (2 each for 10m, 15m, 20m, 40m, 75m) 1 - K1DMOUNT1 Dipole Mount 1 - 25ft RG-8X Coaxial Cable Assembly with PL-259 connectors installed. Home Made Off Center Fed Dipole. It is often confused and called a variety of names, the most common is probably "Zepp," or “center-fed Zepp. By feeding this antenna one third of the way in from the one end, you will find this so called, "Sweet Spot". My best DX on 80 with the inverted L was the East coast from Oregon (pretty easy on winter nights) and Hawaii on a 160 meter version. The challenge with contest operation on 80m is finding an antenna that works well over the range 3. The antenna is close enough. Even the >crossed double bazooka that provides about 55% increase in bandwidth at >the expense of even more loss, doesn't do it. In the past Decide upon Pay for OCF Dipole 7 band 80-6 meters antenna concerned with mall. 5:1 or less with the 5 ft whips or using the Scorpion Cap Hats™ for a smaller foot print. 3 swr at either end of the band 80 meters at 3. Random Length Radiator Wire Antenna. Low Band Vertical parts list 1 2 1 1 1 1 1 66 feet 1 Buddipole. A dipole is fine on 80 meters on up, but on 160, that's usually not the case. 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 125' Dipole 100' Feedline; 80-10 Meter W7FG True Ladder Line Open Wire Fed Dipole 125' Dipole 100' Feedline. prospect, IL. This ham radio coil-loaded 40 and 80 meter inverted V dipole HF wire antenna is easy to build! Loading coils make this antenna a full size on 40 meters and a shortened 80 meter antenna. 80/75 meters. Plugging this in to the formula (468 / 7. Works 80 through 10 meters. 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. dipole, depending on how much extra length (with the 80m traps) I need to add to get it to resonate on 160m. 0 and drops as you go down the band. The quality workmanship is far superior than others. That's all there is to it: a single wire down the middle of a folded dipole!. K8UR shows us how to modify a sloping dipole to make an effective contest antenna. In other words, 100 watts might go in, but only 80 watts are radiated. Do you need an antenna tuner? Nope. Did I mention that we have trees here? Lots and lots of trees. View the manual for MFJ17758 View the manufactures page for MFJ17758 View the eham review page for MFJ17758 The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. Most antennas are based on a dipole, Yagi's use a dipole antenna as the radiating element, vertical half wave antennas are "end-fed" dipole antenna. 7-strand, #14 gauge hard copper antenna wire. And that’s all there is to it! This is a great first antenna! Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. W3DZZ Antenna for the 160, 80, 40 and 10 meter Band. Short 85 foot long dual band 80/40 Meter dipole. MFJ-17758 80/40 Meter Dipole Instruction Manual 1 The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. 80 Meter Off Center Fed Dipole sometimes known as a Windom, if DX is your goal then RADIO WAVZ brings you new technology at an affordable price. ” Other names include the “tuned doublet” and “dipole with tuned feeders. You could use the calculator to build a 75 or 80 meter dipole and then calculate an inverted vee for other bands higher in frequency, suspended under it as shown in the drawing above, from the same support and feed both with the same line to xmtr. , tune) by simply adjusting the length of the tubular elements. Use an off-center feed to improve the SWR curve. 1:1 Voltage Baluns and Lower Loss Coaxial Cable. Not only can this type of dipole be used horizontally, you can also use it in an inverted-v or sloper formation - perhaps as an 80m/160m version? The overall length of my 40m version is 12m / 40ft for the 40m band. And that’s all there is to it! This is a great first antenna! Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. Therefore lower amateur radio frequencies such as 40 and 80 meters are ideal for NVIS use. Since an 80 meter dipole is approximately 130 feet long, and a 160 meter dipole is approximately 250 feet long, this space reduction can be critical in getting the antenna to fit into our typical backyards. (17 x 2 = 34) If possible, erect the dipole into the desired position to make SWR measurements. and available for any band. For now - here are the measurements. the high end. Since we now have eight HF bands, that means that eight different coax fed dipoles are required to adequately cover all the bands from 80 through 10 meters. 42 meters on a side. The circuit shown has been used with a center fed (open wire) 80 meter antenna having the following configuration. By its condition of Dipole in spiral, this antenna much less receives noises that a normal dipole and for that reason mainly in 80 Meters thanks for much. I calculated the length of a 80m dipole, and put these two legs in the hedge that borders my garden. Remember as with all antennas, be safe and use your head. It's simply an open-sleeve ver- sion of the folded dipole. 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. This is my favorite multi-band dipole. The Short Dipole For Multi-Band Use. Off Center Dipole Fed Antenna for 80- 40- 20- 15- and 10- meter Bands. Building it with multiple bands makes each band narrower. Each set is individually calibrated per ANSI C63. A few years ago, I acquired a multiband commercial antenna called a half-sloper. Ver2cal'Wire'Antenna' • Actually'a'ver2cally'orientated' resonate'1/2'wave'dipole'with' the'earth'being'the' return ' half' • Due'to'poor'ground' conduc2vity'a. W3DZZ Multi-band Antenna 80-40-20-15-10m N. Graphics G8ODE 22 Nov 2010 iss 1. Thicker wire provides wider operating bandwidth. No-Trap 80 and 40 meter dipole or inverted-V. It's an 1/8 wave vertical on 160 meters also. It is a resonant antenna. Experienced HF operators will use thicker dipole conductors. Oh…you can use the 40-meter dipole on 15-meters without modification. I still needed the ability to operate on 75-meter NTS, RACES nets or the 60-meter MidAtlantic Emergency net. dipole, depending on how much extra length (with the 80m traps) I need to add to get it to resonate on 160m. After a leisurely walk around the estate with tape measure in hand, I managed to locate several nicely spaced trees that looked as though they would serve to hold up a 160 meter dipole. Handles 1500 Watts. 40 Meter SSB. It will work at 20' but 30' produces a much better radiation pattern. The MFJ-17758 is a two band, 80- and 40-Meter center-fed dipole antenna capable of handling 1500 watts. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. 7J4AAL's Full-Size, 5-Element, 80-Meter, Rotary Beam Antenna This amazing antenna is located near Hiroshima, Japan. (Note: Support can be 80 to 90 feet tall for 75 meters. Dipole Antenna Length Calculator. 7-strand, #14 gauge hard copper antenna wire. The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is:. The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. 5 at 3 and 10 meters (three antenna technique) using NIST traceable test equipment. 5 MHz up to 7 MHz (80 Meter to 60 Meter) $54. Our Club recently had an ARES training/NVIS antenna testing day.