This link is listed in our web site directory since friday aug 25 2006, and till today trapped dipole for 4080 160 meters has been followed for a total of 92491 times. Is a droopy dipole supported in middle by 40 ft mil surplus mast. Here are some typical ocf dipoles that are successful designs 160 6 meter ocf antenna layout using a double tuned stub for better 20 and 40 meter performance here is the 160 6 meter swr graph using 200 feet of rg2 feed line and an average height above ground of 35 feet. June 1991 helped me understand what essential considerations i had to take into account. This link is listed in our web site directory since saturday jan 2 2010, and till today shortened dipole for 160 meters has been followed for a total of 1715 times. All you need is 2 pieces of wire 3 insulators and a suitable feed line.
A half size 160 meter inverted vee may be ok as a first 160 antenna. Dipole performance of a dipole, feedline and balun followed by a tuner a high dipole, centrefed via a balancedpair transmission line, is an efficient multiband radiating system at all frequencies above that at which the endtoend dipole length is about 0. Qsoking magnum 3 large cores 3 kw pep 160 10 meters 72,88,98,or 117 ft. A reducedsize half sloper for 160 meters heres a limitedspace antenna that will put you on the top band. The 140 foot version 80 meters in picture also resonates at about 2.
The measurements below are for building a simple dipole. A customdesigned capacity hat system allows you to get on 160 meters with unparalleled performance find dx. Dx engineering 160 meter thunderbolt vertical antennas are highperformance antennas specifically designed for use on top band. The main category is antenna for 160 meters band that is about 160 meters band antenna. Shortened dipole for 160 meters resource detail the. A particular design is given for an antenna named the bc trapper, designed by jeff briggs, k1zm. Background and mast design i was drawn into the ham world by my son ty w7tyy who lives in portland, oregon, and who though we ought to have a way to talk independent of phone lines and the internet. Build a space efficient dipole antenna for 40, 80 and 160 meters. Ocf 8 bands 1606 hf windom polystealth antenna ni4l.
Based on the success of several uk designs, and to test g4fgqs software, i decided to put together my first 160 meter hwv. Fig 1the shortened dipole resonates in the ssb portions of the 40, 80 and 160meter bands. Of course, this is larger than a typical city home lot, so the dipole may have limited application. The w5gi multiband mystery antenna is a fundamentally a collinear antenna comprising three half waves inphase on 20 meters with a halfwave 20 meter line transformer. The swr plot for an 80 meter broadband dipole is shown below. The results are conveniently displayed in inches, centimeters, feet and meters. See more ideas about dipole antenna, ham radio antenna and ham radio. With out any loading coils to possibly shorten the antenna, it will be nearly 260 feet long. The double bazooka can be mounted in an inverted v configuration for optimum results, center elevated, with 90 120. The double bazooka antenna will handle full legal limit power with no effect to performance. Introduction the dx engineering dxeswa148 linearloaded multiband dipole patent pending is a 148 ft, lightweight yet rugged design that is usable with a tuner from 1. Antennas and working 160 meters milford amateur radio club. The dipole for 160 meters is just like the dipoles that we build for 40 or 20 meters.
Its been a few months since bonnie kb5yse and i moved to. It works, with my 989d tuner and al811 amp on 10 meter to 80 meters bands and 160 too. You will achieve the strongest possible presence at your power level and be competitive with a 160 meter vertical monoband antenna that is only 55 feet tall. My design is similar to his design in that i use 4 inch diameter pvc pipe as the coax winding form. The calculations for an antenna might be complex, a simple dipole antenna however is pretty easy to design. Those parameters are also a function of coil design and placement. Constructing a dipole for 160 meters with a length of approximately 254 feet and a height of 50 feet or higher will produce a low angle of radiation. Distance from center of antenna to the center of the coil in feet must be less than half the total antenna length given above.
Aecreative 10 160 meter amateur ham hf band radio wire loop antenna balun unun diy kit t2002 type 2 iron powder ferrite toroid core 16awg 1. The 160 8040 meter multiband fan dipole lower right mounted on the tower. Use the coil inductance calculator to design your loading coil. The dipole antenna is probably the easiest to make. For the antenna layout below, the center capacitor is 15 pf at element 3 between elements 2 and 4 and a 4. Quickly switch bands and eliminate a tuner as one more thing to adjust. Antenna design information and software directory smeter. In the photo above, the 160 meter section is on top, 80 meters in middle and 40 on bottom. The above graphic depicts the overall layout of the loop antenna consisting of 558 ft. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. Trapped dipole for 4080160 meters resource detail the. I cut about 35 foot of ladder line and hooked directly to my tuner. Wintertime is the perfect time for exploring the top band. I have a kenwood ts450 with auto tuner will it tune.
It works just fine and dandy on 20 meters as well but id rather have a dedicated 20 meter loop for 20 through 10 meters. The measurements below are for building a simple dipole antenna. Cushcraft ma160v 160 meter vertical antennas ma160v free. Keep the 80 meter dipole well away from the 160 meter loop. It may sound and look like a g5rv but it is a substantially different antenna on 20 meters. If you would rather calculate the length of a fullsize. A folded dipole is a dipole antenna with the ends folded back around and connected to each other, forming a loop as shown below. Cage invertedl antenna for 160meters ron, k4sx, describes results obtained from a cage invertedl antenna that can be installed in much less space than is. This dipole has performed quite admirably in spited of its relatively low height. The half sized version, 73 foot 40 meter also covers 60 and 75 meters. I think what youre referring to is a linear loaded dipole, which is different. Its ideal for portable or tactical use and can be easily installed in attics, small lots or covenant. Design parameters for an 8010 meter ocf dipole antenna, divide the. You can put these techniques to work with 80 and 40 meter antennas, as well.
Due to the fact that one wire leg of the antenna is. This is dramatically shown by eznec, an antenna analyzer program popular with hams. We relocated here about a year after hurricane katrina substantially rearranged our lives. Build an effective dipole antenna that needs much less space by adding two loading coils. Nevertheless, the love of experimenting with antennas played a critical part in the successful. This formula to obtain the length of a halfwave dipole antenna will give a good. Widely used on its own, it is also incorporated into other rf antenna designs as well, as the driven element. K6mm 160 meter vertical a restricted space helical vertical. Open the wire gauge and diameter calculator in a separate page. The kj4iif multiband fan dipole for 160, 80 and 40 meters. Bsquare engineering is the first to offer a terminated folded dipole antenna, truly optimized for amateur radio use.
Nvis 80m with 160m full wave loop is less than ideal. This antenna configuration produces a high angle of radiation, consists of a loading coil in each leg resulting in narrow bandwidth, and is. Dx engineering 160 meter thunderbolt vertical antennas dxe. Its been a few months since bonnie kb5yse and i moved to our new home in natchitoches, louisiana. The practical solution is to keep your 160 meter antenna where it is and add a new simple 80 meter dipole 50 feet or less in height. This is the length of a standard dipole but instead of dividing the result in half, use a 3664% offset to determine the feedpoint. My homemade amateur radio antenna for the 160 meter band is the result of many considerations, inner debates and tests. I used it to work up a design for a 120 loaded dipole for 160m, and plan. I want to use 50 ohm coax for feed or since i have a lot of it, maybe 75 ohm coax. Once again the antenna was shipped and received with in a few days. Basiclanguage computer program for trapvoltage rating. At higher frequencies, up to 30 mhz, its gain matches the dipole s. I put up a simple 160 meter invertedvee configuration dipole with the center at a about 45 feet.
This pair will team up nicely to get you want you need for 80 meter nvis in addition to dx capabilities. The loop really, really cuts the mustard on 160, 80 and 40 meters compared to a dipole at the same height. Most text on antenna installations recommend antennas be place one half wavelength or higher for efficient operation. Total length of antenna in feet open the dipole length calculator in a separate page. Can be used as a off center fed shortwave antenna to provide continuous coverage from 500 khz to 60 mhz.
I hope this presentation gives you some ideas as to how best fit a 160 meter dipole on your property to enjoy our top band. Kf9f revives an ocf dual feed multiband dipole this multiband 160 thru 10 meter antenna design was adapted using the dual feedline technique from and old 73 magazine article published in 1984 by w4hdx note that both ends of the feedline are tied together and only grounded at the tuner end. The folded dipole antenna is resonant and radiates well at odd integer multiples of a halfwavelength 0. Nov 25, 2007 design configuration invertedl with a 6wire cage for the vertical radiator. But site topography and accommodation often require a coaxial cable. Alpha delta parallel dipole 160 10 low band dipole covers 160 8040 meters with an overall length of only 100 ft. By way of example, a 160meter dipole that is 35 feet above ground is equivalent, in terms of wavelength height, to a 10meter dipole at about 2 feet above ground. Portable endfed 160 10 meters hf dipole antenna bug out bag.
To make it even easier you can calculate the lengths of wire required to construct a 12 wave dipole using this page. Vertical radiator 6wire cage radiator using eight 5inch plastic storage lids as separators with each wire feeding through each separator. I have it up about 5055 feet between 2 trees, ladder line drop down and makes a turn right into my shack. Placing the coil about halfway up is a good compromise. A customdesigned capacity hat system allows you to get on 160 meters with unparalleled performance.
Between watching unending law and order repeats and the xyls lifetime movie sagas, compounded by a dead 40 meter band here at night, i became so totally bereft of late night activities that i got the bug to get back on 160 meters. Commenting onno6l 4 apr 2009 another fine idea for a 160m antenna. Trapped dipole trapped dipole radio antennas a trap is a coil and capacitor in parallel having a very high impedance at its resonant frequency. The most commonly used antenna is the dipole antenna used for rf with the most common applications being old tv transmissions. Very short nvis 160meter dipole larry nelson k5ijb.
But, it assumes the potential newcomer to 160 has a tower or other very tall metallic support to anchor one end of the wire to. The size of the required coil increases with height. Headsets are bose qc15 with heil hc5 boom microphones mounted per k1dg design. On each half of the antenna, all dipoles halfs are connected together at a common point on each side of the center insulator. Has survived our az windy season without problem and performance is fantastic. The dipole antenna is an excellent option for many amateur radio applications especially on the hf bands like 80 metres, 40 metres, 20 metres, 15 metres and 10 metres. If erected as high as possible and in the clear, then it can provide excellent performance for remarkably little cost. Plus model adds parallel wires for operation on 20 thru 10 meters. You can further reduce the height of the antenna by placing a capacitance hat at the top. Jeff is the author of dxing on the edge, a book dedicated to 160 meter history, operation, and equipment available from the arrl. Portable endfed 160 10 meters dipole antenna george on 24th feb 2020 this is the 4th or 5th product that i have purchased 4 or 5 items from ni4l.
The total length of the vertical radiator is 50feet. Getting on 160 meters on a budget by ve7ig on april, 2009 the point i was making is that a quarter wave sloper for 160 is much simpler to put up than the invertedl if you do have a tower and beam and that would probably apply to half the readers of your article who do have a tower and beam and are looking for a budget way to get. Ty set me up initially with an icom707, an ldg z100 plus tuner, and an inverted v, centerfed dipole cut for 40meter. Trapped dipole for 4080160 meters build a space efficient trapped dipole antenna for 4080160 meter ban. A practical antenna for 160 metres 140 feet of insulated wire, the first half of which 70 feet is space. If a trap is inserted at some point along an antenna conductor, that part of the antenna beyond the trap is. Louis varneys antenna, although three half waves long, was an outofphase aerial. K4sx cage invertedl antenna for 160 meters smeter ham. I used 14 awg stranded copper wire with insulator coating for each conductor. In the evening when most of us have time to relax and enjoy a little time on the radio, the higher frequency bands are either dead or very crowded. About shortened dipole for 160 meters the resource is currently listed in in 2 categories. A long or so folded dipole isnt a 160m antenna, its an 80m antenna.
By way of example, a 160 meter dipole that is 35 feet above ground is equivalent, in terms of wavelength height, to a 10 meter dipole at about 2 feet above ground. Getting a big dx signal on 16010 m from one small, low. Review ultimax dxtreme 124 ft end fed antenna 6 160 meters. Open the dipole length calculator in a separate page. With the ll dipole, you dont complete the loop, you leave a gap in the center of the twin lead or ladder line directly opposite the feedpoint. The main category is dipole antennas for the 7 mhz band that is about dipole antenna projects for the 40 meter band. This fact alone makes this an ideal antenna for restricted space on the top band. Sure you can, however if you shorten one a lot, the feedpoint impedance can drop very low, and the bandwidth can end up being very narrow, and you might have problems with power loss in the coils.