Wire antenna calculator amateur radio station ws6x. Following advice from the late lb cebik w4rnl, i added a second halfsquare 20. Yagi calculator is a free antenna design and analysis software for windows. The half square is my property has a lot of trees, oops. Compact halfsquare for 40m band dx commander amateur. The simple calculator below uses the wellknown standard formula for determining the total wire length in feet for a single element single turn, full wave loop antenna, length 1005mhz. They all use the same parallel resonant impedance transformer to create about 4,000 ohms at the feed point. This will calculate the length of a 1 wavelength loop. Pasternacks microstrip patch antenna calculator determines the length and width in millimeters of a rectangular patch antenna. N4ujw antenna design lab ham radio antennas design 0r. The slim jim, similar to the jpole, is in fact a half wave end fed dipole, in the slim. Compared to a horisontally polarized dipole its gain is low as it will not get the extra circa 5 db due to ground reflexion.
Many configurations exist when constructing the main loop and secondary loop. The basic configuration of a small magnetic loop consists of the main loop, coupling loop, and capacitor fixed or variable. Yagi calculator is a program build to produces dimensions for a dl6wu style long yagi antenna. This half square configuration is a dx antenna that on 10m starts picking up signals from about 500 hundred miles out and gets stronger as the signak come from farther awaythe physical size is a full wavelength long, divided into.
The hsq the halfsquare vertical antenna sm5jab ham radio. The results are conveniently displayed in inches, centimeters, feet and meters. Wire antenna calculator amateur radio ham radio station ws6x. Click on clear values to prepare for new calculations. The simple calculator below uses the wellknown standard formula for. Additional benefits of patch antennas is that they are easily fabricated. The correct lengths for the various models will be displayed in the chart. This calculator is designed to give the vertical length height of a particular antenna, for the frequency and wavelength chosen. A halfsquare is perhaps the secondbest dx antenna to install if you cant afford a tower and a beam the foursquare array is usually a little better. Works either in standard and metric units, and let you choose on material, and loop shape, as circular, square or. In a nutshell, each antenna is an end fed high impedance wire of at least onehalf wavelength and configured as a vertical dipole, inverted ground plane, half square, or bobtail curtain. This halfsquare configuration is a dx antenna that on 10m starts picking up signals from about 500 hundred miles out and gets stronger as the signak come from farther away.
The dl6wu yagi is highly regarded as being easy to build with repeatable results, broad bandwidth and a useful pattern. Half square, double half square and bobtail curtain antennas. However i highly recommend to follow my instructions, which are based on computer antenna simulation software 4nec2, to maximize performance. Hence here is the double biquad antenna and biquad antenna calculators for handmade antenna based on average data. This will calculate the length of a half wave dipole. Running a simple 100 watt transceiver i can work, cw or ssb, most anything i can hear.
I have a 40 meter half square antenna over my driveway now for about a year and have had no complaints from my xyl. Ham radio basicsjim heath w6lg shares a video of one of the largest ham radio antennas duration. Microstrip patch antennas or simply patch antenna are increasingly useful because the antenna is printed directly onto a circuit board. The antenna calculator above uses this formula as a starting point to calculate wire lengths for the dipole. This formula to obtain the length of a halfwave dipole antenna will give a good ballpark value to start with. Vfo a on my dipole and vfo b on my vertical and i found the stereo image very. The half square is a vertically polarized bidirectional antenna. The following program will calculate the lengths needed to construct several popular wire antennas. Any antenna created with this calculator must be fine tuned for vswr. Found a download for magloop4 a calculator for magnetic loop antennas. Build a half square dx antenna radio amateur 051997. So even if you double or half the size of the wire, the outcome is not going to be. In this menu, you need to submit values of multiple. Noisier than horizontal antennas easier to hide in antenna restricted areas can be disguised as flagpole or be a single wire in a tree.
The halfsquare is a vertically polarized bidirectional antenna. I arranged my single halfsquare so it fired broadside in two directions. No need for a tower, rotor, and beam to get dx on the 20 meter band. I agree, this is an excellent antenna that gives you some 40 meter gain at a very reasonable price.
This formula to obtain the length of a half wave dipole antenna will give a good ballpark value to start with. Add a loop of string to the top, and hang it on a tree branch, use it with your. Its a light magnetic loop antenna calculator that run on ms windows, and allow to calculate capacitor values and voltage based on loop circumference, conductor diameter, desired resonant frequency and the operating power. No need for a tower, rotor, and beam to get rare dx or be competitive.
Long yagi are commonly used from the 144mhz amateur band to the 2. The measurements below are for building a simple dipole antenna. I find it is a vertical omnidirectional antenna with some gain because of the top feed wire and in some directions is. Since the loop dimensions are larger than those of a halfwave dipole, the radiation efficiency is also higher. Antenna pattern is omni directional very high gain and low to horizon radiation angle. Hf half square 20 meter band antenna wire antennas uk. This will calculate the length of a 58 wave vertical with 14 wave radials. But compared to a normal quarterwavestick its has some gain and a favourable directional pattern. Ive compared the halfsquare at the same location with a wire groundplane and halfwave dipole. The double half square shown above is a version that has a little more sideways directionality to it if the three elements are not tapered as if it would be in a beam configuration. Halfsquares do have limited vhfuhf collinear j pole with short. The half square antenna is a wire antenna with two vertical radiators fed in phase.
The half square is fed in one corner and according to my mmana model, this. One vertical element 14wave is fed at the top where it is attached to a so239. According to the books it supposedly has a bidirectional pattern. I purchased another 40 meter half square from one of his competitors that i wasnt nearly as happy with, as. Cheap antenna to make from 160m 6m updated pop the antenna is nothing more than a simple 2. Yep, thats right, the inside wall of the spare bedroom ideal for flat dwellers, hotel rooms or whinging neighbours, the loop has a simple switched inductance at the top of the square loop and uses a simple coaxial. The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. The receiving properties of antennas are characterized by the antenna affective area af,t,i, where the available power at the output of the receiving antenna prf is the product of the effective area of the receiving antenna in direction t,i and the flux density swm2hz1 incident from that direction. Calculate the dimensions for a slim jim or j pole antenna for hf, vhf or uhf. The half square antenna is a great wire antenna for the dx edge. This software can not only be used to design but also to find out antenna gain, stacking distance, and standing wave ratio swr to design the antenna, you need to go to task design yagi menu. This does not take into consideration the type or size of horizontal reflectors, of even if there is a need for them. The half square is, in my opinion, the best and easiest antenna to put up and keep up. These are considered as generic calculations and you may wish to use them to learn general information about the antenna structure you are contemplating.
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