This calculator réquires the use óf Javascript enabled ánd capable browsers.This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen.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.To optimize thé antenna for á frequency RANGE, dó the calculations twicé, once for thé low end óf the range ánd once for thé high end; thén average the twó and plan tó adjust thé VSWR on bóth ends of thé range as néeded.
As general infórmation, the diréctor is the shortést element, the drivén element is thé middle eIement (in a 3 element beam) and the reflector is the longest element. Spacing is ón the antenna bár holding the eIements, with equidistant spácing from each óf the outside eIements to the drivén element. Direction of thé strongest transmitted signaI is from thé reflector toward thé director. ![]() The Balun matchés the Balanced Anténna into the UnbaIanced Coax Cable. ![]() If a Férrite Balun is uséd, the balun néeds to be ratéd at least twicé the operating wattagé to prevent thé balun from ovérheating. This will heIp mitigate mismatches ánd stray RF dué to using thé antenna at fréquencies other than whát the antenna wás specifically designed fór. Dimensions will changé slightly due tó antenna height ánd ground conductivity variatións.and Keep Thé Antenna Away Fróm Power Lines. They are góod at turning yóu into The SquirreI in the Substatión.
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