This calculator provides quick estimation of antenna size required for a given gain and frequency. Skewing the antenna length a bit so its a few meters shorter or a few meters longer than half wave resonance on 80m makes the 40m, 20m and 10m matching much easier which is why you often see 5 feet recommended for an 80m 10m doublet instead of 125 feet which would place half wave resonance right in the 80m band. In total, its around 18m of wire per leg folded 3 times and fed with 300ohm balanced feeder. Church in designing an aplanatic doublet page 450 of the november 1984 issue of sky and telescope. Here is antenna design software to meet your needs. View antenna display, showing the wires making up the model of the fiveelement beam, with currents and 2d slice superimposed to show orientation. This is the antenna for you guys who want to get on hf effectively, and havent too much space or cash to throw around. Dipole antenna calculator software free download dipole. The measurements below are for building a simple dipole antenna. Enter three refractive indices n 1, n 2, n 3 and correspond wavelengths l 1, l 2, l 3 for both front and rear doublets lens and finally press the calc button. G7fek limited space antenna nested marconi antenna doublet aerial for hf amateur ham radio short wave bands some general talk about design.
Perhaps too many new hams embarking on their first hf adventures think only of resonant dipoles fed with coaxial cable and plugged directly into the transceivers output connector. Calculate safety distance from your antenna icnirp is a calculator software that. Doublet antennas may have some gain on the higher frequencies, unfortunately every 3 db peak has a 20 db null. Coax dipole calculator an efficient program to calculate dimensions of coax dipoles, or bazooka antennas considering velocity length of different coax cables. Another good choice might be the cobweb antenna, which is small, horizontal, omnidirectional, without nulls. This calculator is designed to give the horizontal length of a particular dipole including tees antenna, or one side of it, for the frequency chosen. Evolving from a simple endfed marconi for 80m, the idea was to use the opposing. The following program will calculate the lengths needed to construct several popular wire antennas.
Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. The cure for all these evils is a regular maintenance program to examine and. As we are dealing with an integer number of elements. Amateur dipole antenna calculator this calculator requires the use of javascript enabled and capable browsers. For years the handbook has shown the foot center fed doublet, using open wire line to be a recommended multiband antenna. Dave gauding, nf0r, is a close friend of mine, and he had told me about a st. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. Zs6bkw antenna category is a curation of 20 web resources on, some useful zs6bkw modifications, zs6bkw wire antenna, g5rv antenna revisited. Wire antenna calculator amateur radio ham radio station ws6x. The random length all band doublet represents some clear advantages in cost and operational flexibility within the limitations of the average australian suburban block. What the student and the instructor should keep in mind l. In addition, a doublet must always be used with an antenna tuning unit atu due to the impedance mismatches. The garden here at pzt towers is 50ftx20ft so a fulllength flattop dipoledoublet to get me onto 7mhz was out of the question.
You should consider a multiband vertical on that 7th floor roof, if roof is large enough to lay out several quarterwave radials. Doublets, ladder line and automatic remote tuners the. The results are conveniently displayed in inches, centimeters, feet and meters. Super jpole antenna calculator and plans collinear design. I could not find any published formula for them but only sample antennas. Effective jan 2016 i will be changing web hosting providers and as such a complete redesign of my website using a content management systemcms to better design and host the site. Antenna calculator length of the dipole antenna calculation.
The norcal doublet antenna came about due to my desire for a simple antenna that could be erected very fast, only needed one center support, and did not take up much storage room. The antenna is constructed much like an ordinary dipole antenna but with 58 wavelength elements matched with an added impedance matching section of balanced feed line. If your main interest is dx, the 80 meter doublet is not a good dx antenna. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. Introducing the allband doublet universitas padjadjaran. Once the two end masts were in place, we moved inside to construct the doublet antenna. The list will grow with your help so lets start and share the knowledge.
I think that if you can deal with the open wire line routing issues, and use an efficient matching network tuner it may well be the very best multiband antenna. In its simplest form, a doublet is any dipole fed with balanced line feeder and cut to length for its lowest frequency of operation. An improved double extended zepp by rudy severns, n6lf 32857 fox lane po box 589 cottage grove, or 97424 this article was orinally published in the arrl antenna compendium vol. The allband doublet horizontal wire antenna has a history almost as long as amateur radio itself. This does not take into consideration the type or size of horizontal reflectors, of even if there is a need for them. Actually, its a design from zs6bkw aka g0gsf, similar to the g5rv, but it actually resonates on five bands, well 6, actually and doesnt rely on a tuner atu to make. This is my 1 st contribution and i see the hot topic is the g5rv. There for if you can have only one hf antenna the random length all band doublet would be a pretty good choice. Here is a simple antenna calculator for two popular forms of ham radio hf wire antennas. Enter the resonant frequency for the dipolevee antenna calculation.
If the doublet is cut for 80 feet, the impedance will be low on 80 and a 4. Describe your experience with the w7fg tuned doublet antenna and tell us why you give it the rating you did required. Louis doublet, that used small wire for the radiators and computer cable for the feedline. This is my experiment with the 80 meter doublet antenna, using tv twinlead wire, which is 300 ohms. Transmitters provide oscillating electrical energy on to the antenna which radiates them as electromagnetic waves. All you have to do is run the program and input your design frequency in the white window top left. Quick swr calculator for vertical and dipole ham radio antennas heres a really simple way of double checking how to much to trim your antenna elements. All you need to do is enter the desired resonant center frequency in the form below, then click calculate.
West mountain radio extended double zepp antenna calculator. Im constantly experimenting with different radiator lengths and layouts. The allband doublet horizontal wire antenna has a history almost as long as. The dipole antenna is a straight electrical conductor measuring 12 wavelength from end to end and connected at the center to a radio frequency rf feedline. Antennas are equipped with radio transmitters and receivers. Enter the desired frequency and select the desired calculation from the drop box. Your new doublet is a balanced antenna and will need a balanced antenna tuner.
This calculator is java script version of a basic program written by john a. Mfj1777 1606m all band doublet 102ft radioworld ltd. As shown in figure 1, the basic allband doublet antenna system consists of 3. In the video demo, i use the program to design a 20 meter dipole which is to be installed 30 feet above. Cebik, w4rnl 1434 high mesa drive knoxville, tn 379384443 email. Dipole antenna calculator software antenna design calculator v. G7fek limited space antenna g7fek multiband nested marconi antenna 2008 version rev 5 this antenna was first conceived as a simple dual band antenna in 1988, in an attempt to achieve sensible dual band operation in a small garden of 14m 46 ft length. This antenna, also called a doublet, is one of the simplest types of antenna and constitutes the main rf radiation and receiving element in various sophisticated types of antennas. Cobwebb revealed g3tpw cobwebb antenna for the 14, 18, 21, 24 and 28 mhz bands the main advantages of the cobwebb over other 5 band 14 to 28 mhz antennas are that it is small, lightweight, strong made. A linear loaded voltage fed tee vertical antenna with the entire vertical section. It has the yagis gain and the quads direct feed and signal capture. Ive put up the same multiband doublet i had at mont vernon. The basic design comes very close to the design at. The general design formula for this type of antenna is quite simple.
To do this the g3rwf doublet antenna had to be modelled three times. In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The matching section is 450 ohm open wire feedline and is a compromise impedance between the 58 wave antenna elements and the feed point, a 4. Antenna is an electrical device used to convert electrical power in to radio waves and vice versa. This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen. The 80 meter doublet antenna 88 ft25ft 300 ohm twinlead.
The correct lengths for the various models will be displayed in the chart. Dipole antennas plans category is a curation of 155 web resources on, practical dipole antenna, trapped dipole antenna for 203040m, center connector for dipole antenna. Despite all the words and diagrams in handbooks over the years, newcomers still send me questions about the antenna. Antenna calculators antenna plans antenna designs construction antenna how to videos antenna manufacturers.
Super strong custom fiberglass center insulator provides stress relief for ladder line 100 ft. Verticals covers all the common types with a coil calculator built in for the antennas that require themthe quagi may be the best of two worlds. Dipole, inverted v and ground plane antenna calculators. I think i need to find a slot for my the optimised doublet antenna talk at the club which ive given 3. An allband doublet is a rather refined antenna system when looked at in detail. The models were initially all referenced to 50 ohms, and later repeated with a 200 ohm reference. Tie cord onto the ends and, if you want to make life easier, use wire winders at the ends of the cords to make handling in the field simpler. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end.
Its a classic doublet which is a half wavelength long on 80 meters fed in the center with ladder line. Antenna, ve3sqb ham radio antenna design software programs. It pays to have a small calculation program to assist in finding and visualizing the. Seeing all the useful comments and some confusion, i hope what follows helps. Quick swr calculator for vertical and dipole ham radio. I built this antenna and quickly tried it out in february of 20. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. As of 100102 my configuration of the linear loaded voltage fed tee verticaldoublet antenna is. At the ends of the doublet you may wish to use insulators.