80 Meter Dipole







Enjoyed the article. 50 foot eighthwave Halfwave wire dipole is: 130. It's easy to use a 468/f long piece of 450 ohm ladder-line for the folded dipole element. AI4JI's Off-Center Fed Dipole Antenna System This antenna has become quite popular, as the performance is exceptional across the Amateur HF bands. Homebrew 40/80 Trap Dipole Design This Antenna design was one that I used about 4 years ago, it worked exceptionally well on 80m and 40m. Designed for limited spaced applications and ruggedly built for many years of service. age 40-meter or 80-meter amateur dipole generally runs from 50 to 80 ohms of re-sistance at resonance. long, requires wide range tuner Model DELTA-C; list $29. 80/40m Trap Dipole Measurements of the dipole are: 9. The 160 meter band vertical antenna is tunable with an impressive 40 kHz bandwidth. Use on 160 Meters as Marconi with tuner and ground. Overall length is 82 ft. I came up with this antenna design for use with hidden transmitters on international-rules ARDF events. One of his series is building a 40/80/160 Inverted V Dipole. 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,. 12 meters is like 1. 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. My K9AY RX Antenna. 2x10 M (2x33 FT) MID-LOADED DIPOLE. It is simple to make and cost can be nearly nothing. We compared both S meter and audio tests with this station in Denmark. A trapped dipole is a dipole with blocking filters fitted at the operating wavelengths. For example, a 40 and 20 metre trapped dipole would have traps installed at the 20 metre points which would prevent the 14Mhz band, effectively shortening the antenna. I also often use it for listening on other bands since it is so quiet. 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. The antenna is resonate on both bands and does not require an antenna tuner. Coaxial Folded Dipole Antenna. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. Remember that our 160M and 80M antennas are actually NVIS because most of us have height limitations under 70 feet. As an example consider an 80/40 meter trap dipole. net Abstract 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. After trimming, the 80 meter elements were about 4 feet long for a total antenna span of about 76. On tests it is comparable to a full size dipole at similar height for DX working. The original javascript was created by Jack Ponton and can be seen here. I found the lengths he gave to need some adjusting. I put up another se­parate du­al band an­ten­na for the new bands, now that I had a rig (FT-950) that cov­ered them. 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. The short stubs on each antenna are strategically sized and located to permit more flexibil- ity in adjusting the resonant frequencies of the antenna. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands with the exception of the lowest part of 80m. 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. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. Murray, KD1BL Author's Note: This article describes a 75/40 meter NVIS, but one could use the construction techniques to build just a 75 meter or a 40 meter version. ANTÉNY PRO 80 m. The measurements below are for building a simple Dipole Antenna. On 40 meters it works like a normal 40 meter dipole. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. , about ¼ wavelength. HOW TO Before you start, bee sure that you know exactly where you would hang the dipol. The SWR is less than 1. 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. 13 Length of Half-Wave Dipole Antenna 26 Fig. -Half-wave dipole is 260 Ft, and it's "low" at only 130 ft Working 160M From a Small Lot (and Larger Ones Too) Jim Brown K9YC [email protected] 5 MHz (60 Meters to 80 Meters). com FREE DELIVERY possible on eligible purchases. 5m at the ends. this, one thing that is certain is that this antenna performs extremely well on 80 meters in a small space, and it is very difficult to get it wrong for that band. prospect, IL. 8 MHz, dividing 3. TRAP-dipole - the W3DZZ antenna for 40 and 80 meter band - updated nov. How to make a loop antenna for 40m and 80m bands. So if I assume the popular dipole formula 468/F(Mhz) is correct then on 80 meters and applied also to a quarterwave then I would see resonance at F(Mhz) = (468/66)/2 = 3545Mhz. These antennas can be mounted horizontally, vertically or as a sloper. drainpipe, and RG58 A/U coax - 15,55 windings, all counting is done by the program COAX-TRAPS. 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. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials. Buckmaster 4 Band 3000 Watt OCF Dipole 40, 20, 10 & 6 Meter $298. A light breeze will be no problem, but it is not designed to. The dipole is constructed using top quality, Poly-STEALTH 13 Breaking strength 370 lbs. 17 Meters (18. I got the antenna built and up today about 35 feet. End-fed horizontal wire, an EFHW, offers the. (QST, Oct 1926, "The Length of the Hertz Antenna" shows in line 2 of the table that a similarly installed random wire should use 423/f. 8mhz) is about 38. 6-80 Meter OCF Dipole Antenna by Alpha Antenna. Total length of antenna in feet Open the dipole length calculator in a separate page. Thinner wire is more fragile. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. I wanted high efficiency 40 Meter antenna with low-angle radiation. Using multiple dipoles with one feedline is a common practice among hams, but the fact still remains that, for 80-meter operation, it takes between 120 and 135 feet of wire to radiate effectively. My 160-meter ground plane with eight raised radials seemed to work so well that an 80-meter design with four of them (4-square) was the next project. It gave me 40, 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna, in this case – with the coils for 40 – it mucked the maths up and caused the ATU some trouble. Thread two dipole arms vertically and a fully extended whip on top. Designed for limited spaced applications and ruggedly built for many years of service. Many hams’ first choice of antenna is a half-wave dipole. The larger the wire, the wider the bandwidth. My xyl and I are trying to become more food self-sufficient. Enjoyed the article. Buy #1 Falcon 80-6 Meter Off Center Fed Dipole Amateur Ham Radio Antenna: Radio Antennas - Amazon. Flags and Pennants-- Receive antennas for limited space with good noise rejection. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. 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. 5:1 or less!. A 2-Meter Vertical Dipole Array, KG4JJH Page 2 of 6 three ½ inch unions, and 12 inches of ¼ inch PVC pipe (0. Since the situation described by Dave can be modeled directly in NEC-2 or NEC-4, using the transmission line feature available on NEC, I decided to look at some SWR curves across 80 meters. Enjoyed the article. 16 feet over all. Dipole Models There are 3 configurations. 80 m shortened Dipole project. 5 m as the average of 48. This is particularly true at our fairly low 40 foot test height. Low-mounted horizontal dipole, typically mounted at 1-2 meters above the ground, but sometimes even laying on the ground itself. The radio is a Icom IC-7851 with a custom single band, single 8877 amplifier. The idea is that for a given ham band there are min and max frequencies which are easily converted to half wavelengths by the famous 468/f generally used by hams for dipole lengths. In the real world, it is more like 80%. Handles 1500 Watts. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. If you are constructing a vertical dipole, then the one end can be literally 6" above ground (as long as it's insulated from ground), and the other end of the wire is straight up by a 1/2 wavelength, and fed in the center. However, we can reduce the space needed to a quarter wavelength if we decide to use an end fed antenna. I tried 160 meters, but that was pushing it a bit too far for the tuner. The wire used is #14 AWG Flex-Weave. (External tuners work also. Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above). The RG58 was at a 90 degree angle. ANTÉNY PRO 80 m. Another often cited reason is that the inverted vee makes a better match to the typical 50 Ohm feed line. I built the dipole and did some testing using my K3’s built-in SWR meter. Meaning that i have hoisted the center insulater to the highest point i can on my house and then taken each leg away from the house and away from each other as far as possible. Then select “meter/cm” or “feet/inches” as you. 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. I'm mostly working FT8 and experimenting with QRP on WSPR mode. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. 3 swr at either end of the band 80 meters at 3. 7-Band: 75/80, 40, 20, 17, 12, 10, 6 meters. Low Band Vertical parts list 1 2 1 1 1 1 1 66 feet 1 Buddipole. Combines the tremendous DX firepower of the 1/4-wave sloper with the wide bandwidth of the 1/2-wave dipole. One of these days…. Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. Modular construction with step-by-step instructions assures you of a top notch radio station when completed. The performance is still good, so ideal if you have a small garden or want to try experimenting with bits of wire. The SWR plot for an 80 meter broadband dipole is shown below. Power Input - 1000 watts PEP** Wind Load (sq. If you look closely at the picture above you will see a wire dipole hanging from the tower. A half-wave dipole is cut to length according to the formula: total length (in feet) = 468/f, where f is the centre frequency in MHz. 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. Unlike a dipole, the NB6Zep will operate on all ham bands 40-10 meters (including the WARC bands) with no strain on the antenna tuner, transmission line or operator. Frequency Devices 60 to 80 Meter Half Wave Dipole Antenna. We are going to use an 80 meter ½ wave dipole for this discussion. At 100w I was able to make phone contacts from all corners of the country plus the Virgin Islands on each band. 5 MHz band is a band of radio frequencies allocated for amateur radio use, from 3. The CB Radio Talk Forum. I have heard that in the past, but thought it would be shaky, narrow-bandwidth, RFI problems, etc. One aim is to see the general patterns of variation in antenna gain, take-off (TO) angle, and feedpoint impedance as we gradually increase the height in 1/16 λ increments. As a bonus, this antenna works even better at higher frequencies, where it's. I like to use a home made current choke to keep RF from coming back on the feedline. Requires only 90' of space. Although a combined antenna is a compromise over two seperate dipoles, sometimes the available space or supports prohibit such. The second from the left is 60m can can be ignored. Since the situation described by Dave can be modeled directly in NEC-2 or NEC-4, using the transmission line feature available on NEC, I decided to look at some SWR curves across 80 meters. Halfwave Reflector is: 136. Turn your existing 80-meter dipole into a broadband antenna by simply modifying the feed line. 647 MHz) renders the dipole resonant on the 80 (actually 75) meter band, while resistor R has as sole function bleeding off static charges, hence protecting capacitor C. Only a dipole would be easier to construct and maintain. Enter the Frequency in MHz. P = Power (watts) into antenna feedpoint. Another often cited reason is that the inverted vee makes a better match to the typical 50 Ohm feed line. New in the bag Spi-Ro Manufacturing 40 and 80 meter trap dipole antenna. Although local contacts can be made, the vertical helix does a much better job on DX. 43 KB; Low Noise Amplifiers for 2304 3456 5760 and 10368 MHz. HRO Discount Price: $139. The larger the wire, the wider the bandwidth. Shop with confidence. As the frequency is lowered, the efficiency drops, and rather drastically. The maximum overall length is 100' 10 1/2". Here is my home HF antenna. Here is the SWR measured across the whole range from 80 - 15 meter The 80 Meter band is shown below scanning from 3. Buxton, W8NX in QST July 1992 Issue. The loop, however, remains up after three years, and is still a go-to for 160 meters. 13 results for 80 meter dipole Save 80 meter dipole to get e-mail alerts and updates on your eBay Feed. On 40 meters it works like a normal 40 meter dipole. I will be operating from my shack again this evening. (External tuners work also. 15 MHz traps 0. This pattern will reverse when the feed-point is moved as little as 5% off center. These antennas can be mounted horizontally, vertically or as a sloper. The vertical wires are spread out 40 feet at the bottom in this case. Note: Click 80 meter loop for a sketch of a similarly constructed 10 - 80 meter • Unlike a center fed dipole, the loop can be fed at any convenient point. High Performance 40 Meters Vertical. 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. When balun, feed line and tuner losses are included, losses can be terrible. Here are instructions for making a multiband end-fed half-wavelength antenna that works on 17, 20, 30, and 40-meter bands. for a Dipole or Inverted Vee Antenna. 00 RadioWavz 80 METER DIPOLE 1:1 1500w SSB/PEP 200w CW (125' 8") $69. The efficiency of HFM-230 multi-wire broadband dipole antenna is much higher as compare to HF-2-30 folded dipole antenna. Coaxial Folded Dipole Antenna. Many hams’ first choice of antenna is a half-wave dipole. Because I live on a small city lot and the trees are not in perfect locations I asked myself how I could get this antenna higher? This is what I came up with. The antenna was created for the 40 meter band and above. The 80 meter or 3. That said, you will need two 10' sections on 10 meters, two 13' sections on 15 meters, two 18' sections on 20 meters, two 35' sections on 40 meters or two 70' sections on 80 meters to build a half wave dipole antenna for your band or bands of choice. I was wondering if you could send me the details to convert my 80 m long wire into an 80 m folded dipole that I might be able to actually use. An Attic Coaxial-Cable trap dipole for 10, 15, 20, 30, 40, and 80 meters Trapped dipole for 40-80-160 meters Build a space efficient trapped dipole antenna for 40-80-160 meter bands using RG-58 and PVC pipe by W8NX VK5AH -HF 4 Bander dipole A multiband 80-40-20-15 meters dipole wire antenna that can be extended to cover 160 meters too. 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. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arraignment. The easiest antenna to make and put up seemed to be a full wave loop for 80 metres. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. At present we do not have too much for receiving antennas for 160 meters. All antenna lengths in the information below are in feet and are the results based on the standard formula of 468 / FMhz = total length in feet. 5 feet (including the coils). A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. A dipole is fine on 80 meters on up, but on 160, that's usually not the case. Build an HF Ham Radio Dipole Antenna It is easy to build, construct and erect a dipole antenna for the HF bands: 160, 80, 40, 20, 15, 10 metres, etc using a few simple components at a minimal cost and get great results. Use on 160 Meters as Marconi with tuner and ground. 5 meters (126. antennas that are tunable to operate over segments of the entire 75/80 meter band with an SWR of 1. Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above). 80 MHz - This is for a WICEN commercial allocation. It's also ideal for those who want a high performance antenna with world class DX coverage 80, 40, 20, and 10 meters. The metric formula is total length (in metres) = 142. That could perhaps work well for NAQP and Sweepstakes. ALPHA-DELTA DX-DD 80 and 40 Meter Dipole Kit - Overall length 82 ft. How well and antenna works is a difficult question to answer. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. The SWR across the 80 - 15 meter range was tested and the results were good for a first pass. Only a small part of the 20 meter band. 80 Meter Ham Station Plan - PLAN 14004 A complete 80 meter CW and AM voice amateur radio station including an AM modulator, VFO and detector, oscillator, audio amplifier, CW transmitter, RF amplifier and dipole antenna. This pattern will reverse when the feed-point is moved as little as 5% off center. Covers all bands, 160-10 Meters with antenna tuner. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. I want to add dipoles for 80m, 15m and 10m. Because the MTR doesn’t have an ATU or a SWR meter and I don’t want to carry anyone of those, I decided to make an antenna that fit the objective: Been light! The search for such antenna endup with the trapped dipole or the linked dipole. FAN DIPOLE 80-40 with 1:1 balun, are the simplest practical antennas from a theoretical point of view; the current amplitude on such an antenna decreases uniformly from maximum at the center to zero at the ends. Folded Dipoles; Folded Dipoles; G5RV Multi-Band Antenna The G5RV antenna, with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3. See Fig­ure 8 for the SWR curves. 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. Half Wave Dipole. The 40-meter loop had been removed to make way for a family garden in the back yard. 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. For the higher bands, we would place our multiband dipole at about 44 meters/144 ft (approximately the average of 44. DX Engineering 80 Meter Full Size Quarter Wave Vertical Antennas, model DXE-7580FS-VA-1, are high performance 68 ft. prospect, IL. For a coaxial fed, "One Antenna Do All" you can't beat the off center fed antenna. RadioWavz 80 METER DIPOLE 1:1 1500w SSB/PEP 200w CW (125' 8") An 80 Meter Dipole antenna with a 1:1 balun, length 125' 8", is the simplest practical antennas from a theoretical point of view; the current amplitude on such an antenna decreases uniformly from maximum at the center to zero at the ends. I also often use it for listening on other bands since it is so quiet. The main category is Dipole antennas for the 7 MHz band that is about Dipole antenna projects for the 40 meter band. This calculator uses a "K" multiplying factor value of. February 7 of 2010 was a quiet Sunday. 7 which is ok and 15. Click on Calculate and the optimum length for that combination will be displayed in feet and inches. The most simple is a 75 meter dipole fed with open wire or ladder line, tuned up on 160 meters, as shown in Figure 1. When determining how long to make each leg of a Dipole antenna, dividing the frequency in MHz into 468 will give the overall length. 40 Meters each leg 33 ft. A horizontal dipole or inverted-V dipole for 80 meters 35 - 70 feet high produces competitive results at 500 miles or more 100 feet or higher produces competitive results at 1000 miles or more A dipole 70 to 100 feet high is a very competitive single antenna A horizontal dipole and a small 2 element Yagi for 40 meters. I put up another se­parate du­al band an­ten­na for the new bands, now that I had a rig (FT-950) that cov­ered them. I took a picture this morning before leaving for work of my latest homebrew 80 meter dipole. Fig 1—Broadbanding an 80-meter dipole using a fan-shaped pair of unequal-length radiators. I found the lengths he gave to need some adjusting. 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. MFJ-1775B 80/40 Meter Dipole Instruction Manual. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. W3DZZ Antenna for the 160, 80, 40 and 10 meter Band. Even zip cord such as what is used for lamp cords will perform quite well. This was the first time that I was ever able to use my dipole on 80 meters. It's a great HF antenna for the ham radio operator with a smaller backyard! The. The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. GB3BR Brighton has just come back on the air so I’ll be monitoring. Its total length is 85 feet. It is a full size antenna on 40 meters and a shortened 80 meter antenna. Now it's time to extend the Fan with more bands. We compared both S meter and audio tests with this station in Denmark. Thicker wire provides wider operating bandwidth. One of these days…. , extreme low or high impedances) at the tuner end, on all bands. Manually trimming and tuning the elements to resonant frequencies on the bands they are cut for. 102 feet long, shorter than 80 Meter dipole. About Trapped dipole for 40-80-160 meters The resource is currently listed in dxzone. Dave Tadlock, KG0ZZ, has a number of YouTube videos showing how to build antennas. Products (Total Items: 5 ) 80/40m Dual Band Bazooka Antenna (0) Your Price: $233. One of his series is building a 40/80/160 Inverted V Dipole. Twenty meters designates the length of the particular radio wave used to transmit and receive voice and Morse code. It's working out very well so far, I worked GB4BIT last night who was portable on Bardsley Island, Wales. Fact is, the average commercially-manufactured, HF mobile antenna is about 1% efficient on 80 meters. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Super-strong injection-molded center insulator with built-in SO-239 connector and hang hole. Get on 160m with your 80m dipole I was recently reminded that I can use my 80 meter Dipole antenna to get on 160 meters. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. There are no complicated wires or losssy coils to deal with. In the drawing above, it is shown for just four bands, 80 thru 10. The large diameter yields broadbanded coverage of the 80 Meter Band. The antenna can be mounted as a simple dipole or inverted veeThe OCF-3K40 is complete and ready to install. The CB Radio Talk Forum. 8mhz) is about 38. I still needed the ability to operate on 75-meter NTS, RACES nets or the 60-meter MidAtlantic Emergency net. The Fan dipole for 40/20/6m performs well. I chose 58' for Mid 80 Meter Operation. The idea is that for a given ham band there are min and max frequencies which are easily converted to half wavelengths by the famous 468/f generally used by hams for dipole lengths. Handles 1500 Watts. The maximum overall length is 100' 10 1/2". This is simply out of the question at my QTH. Many hams do quite well with dipole antennas that are electrically low; for instance, an 80-meter dipole strung between two trees at 50 feet (less than a quarter wavelength) allows me to work Europeans regularly on 80-meter CW with a 100-watt transceiver. The antenna as shown here can handle up to 1000 watts input. 468 ÷ freq (mHz) = Length (feet). I got the antenna built and up today about 35 feet. Feed-point Connector for Inverted V Dipole Antenna Click here to get the instructions off his website. , extreme low or high impedances) at the tuner end, on all bands. Once the two end masts were in place, we moved inside to construct the doublet antenna. " B-Square Engineering is the first to offer a Terminated Folded Dipole antenna, truly optimized for amateur radio use. Notice that at prime DX radiation angles, in the broadside direction, the dipole is moderately superior to the delta loop, except at the very lowest angles. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. 8mhz) is about 38. Showing the single result. I will be operating from my shack again this evening. By varying the length of the 450 ohm ladder-line feeding the. Products (Total Items: 5 ) 80/40m Dual Band Bazooka Antenna (0) Your Price: $233. How to build a mono band 80 meter 1/2 wave wire antenna. I started to make the TRAP's: I use 50 m. The random length all band dipole represents some clear advantages in cost and operational flexibility within the limitations of the average Australian suburban block. A trap design guide is provided below to aid multiband dipole construction. This is usually called a "fan" dipole and works well when tuned for lowest SWR. A muffled frying sound indicated its displeasure. 95 * Buy It. Here are instructions for making a multiband end-fed half-wavelength antenna that works on 17, 20, 30, and 40-meter bands. Fact is, the average commercially-manufactured, HF mobile antenna is about 1% efficient on 80 meters. 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. The large diameter yields broadbanded coverage of the 80 Meter Band. 7J4AAL's Full-Size, 5-Element, 80-Meter, Rotary Beam Antenna This amazing antenna is located near Hiroshima, Japan. Ham Radio HF/VHF Antenna Lengths Chart. 00 one side. The loop really, really cuts the mustard on 160, 80 and 40 meters compared to a dipole at the same height. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. Each cage dipole is hand made with quality and care, using materials that will take the abuse of even the most harsh enviroment. It is not recommended that the Dipole in its 30M and below configurations be left up in any windy conditions. 100 kHz BW on 80 meters. By adding another original Slinky coil to each end of the 40 meter dipole, and stretching the whole antenna to about 30 feet in length, you can make an 80 meter dipole that will fit in most attics and family rooms and even a basement ceiling or hallway. Later, I put up an 80-meter dipole right behind the house, fed with about 30 feet of RG-8X, at about 20 feet, supported in the middle with the 20-meter vertical aluminum dipole (see elsewhere on this site). This is a little page with lots of pretty pictures and graphs about my dual inverted V antenna for 40m. This antenna is 58 ft tall and is mounted on a hinged base. This is particularly true at our fairly low 40 foot test height. Place a 1:1 Balun on the Antenna end of the Feedline. Each cage dipole is hand made with quality and care, using materials that will take the abuse of even the most harsh enviroment. My 160-meter ground plane with eight raised radials seemed to work so well that an 80-meter design with four of them (4-square) was the next project. One side of the dipole goes up from near ground level to about 14 meters (45 feet), then out (25 meters) toward the front of my lot. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. The MMANA-GAL model of the K1POO antenna at 8m height shows that the antenna has a more complex lobe structure as the frequency increases. If you have followed the instructions and installed the antenna with about one foot of the ends wrapped back on themselves, the resonant frequency on 80 Meters should be somewhere near the bottom of the band (3. 40 meters had the 39 Meter shortwave broadcast stations, so at night, 80 meters was pretty much it. After trimming I found that a main element length of about 67 feet gave a good match across the 40 meter band. Power Input - 1000 watts PEP** Wind Load (sq. HFp 80 Meter Dipole Configuration Table Note - this is for one-half of the Dipole - set up each side the same way. However, we can reduce the space needed to a quarter wavelength if we decide to use an end fed antenna. 000 Power Rating 2kw Antenna Lengths 10 Meters each leg 9 ft.