Loss = where pi ≈ 3.14, d = distance and lambda = wavelength, in meters. It calculates the surface area of an imaginary sphere of radius, d, that the radio wave illuminates uniformly: The operating frequency of the transmitter and receiverįree space loss from an isotropic omnidirectional antenna is described by this formula.Receive station gain (actual receiver gain minus feedline loss, x antenna gain).
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