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Two elegant practical and portable 6-meter gain antennas, a two-element quad and a tree-element Yagi antenna for 50 Mhz-6 meter band Vertical plane antennas' beaming comparision - Animated quad and yagi comparison. Lightweight fiberglass or similar tubes supporting a wire structure of elements [ Hits: Votes: 3 Rating: 6. It exhibits a forward gain of Good performance can be obtained with simple antennas made from some very ordinary materials. It exhibits a forward gain of 9.Įlements [ Hits: Votes: 4 Rating: 5. The article consist of two version of a This design exhibits a very clean pattern and is perfect for RDF use. For the bands 10 m and 12 m the Yagi is working as a reflector-radiator-Yagi, for 15 m and 17 m as a beam with radiator and director. You must only correct the lengths of the elements for QSY, see table down. The elements can be removed and replaced in a few minutes. Include link the original to QST article. A quarter-wave choke of coax is grounded at the socket. To set your personal settings enter your callsign.The antennas are feeded with the DK7ZB-match. Spacing is on the antenna bar holding the elements, with equidistant spacing from each of the outside elements to the driven element.ĭirection of the strongest transmitted signal is from the reflector toward the director. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end then average the two and plan to adjust the VSWR on both ends of the range as needed.Īs general information, the director is the shortest element, the driven elements are the middle elements in a 7 element beam, each the same size and the reflector is the longest element. Enter the desired frequency then click on Calculate and the optimum values for that combination will be displayed in feet, inches and fractions of inches, and in meters. You can also register for my website here.This calculator is designed to give the critical information of a particular beam antenna, in this case a seven element Yagi, for the frequency chosen. Why not take a look at my YouTube channel here or Twitter posts here. #4 – 50 ohm feed point (cm): (30000 * (0.025 * velocity factor)) / frequency in MHz
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#3 – 1/4 wave radiator section (cm): (30000 * (0.25 * velocity factory) / frequency in MHz)) – ((300/frequency in MHz)/2) In calculation #3 I have deducted 1/2 the length of the calculated gap (#5) #2 – 1/2 wave radiator section (cm): (30000 * (0.5 * velocity factor / frequency in MHz)) – ((300/frequency in MHz)/2) In calculation #2 I have deducted 1/2 the length of the calculated gap (#5) #1 – Overall length(cm): (22500 * velocity factor) / frequency in MHz
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This calculator uses 0.95 as default but this can be changed depending on what material you will be using to make your radiator.Īctual wavelength (m): (300 * velocity factor) / frequency in MHz Copper slows RF by around 5% so the VF will be 0.95 (95% speed of light). Velocity factor (VF) needs to be taken into account when calculating your antenna.Ī common conductor used in antenna construction is copper. Conductors such as copper, aluminium and steel will slow RF down.
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Speed of light is used to determine the speed at which radio waves are travelling in free space. Velocity factor: The conductive material user for the antenna’s radiating element will affect how well RF propagates through it and certain materials can slow the RF. Frequency (MHz): Input the frequency for calculations