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James A. Van Allen journal, October 1955-March 1958
Page 189
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Free Space transmission ratio: ((P sub r)/(P sub t)) = (((lambda)/(4(pi)d)) exponent 2)(g sub t)(g sub r) (P sub r) = received power {measured in space units} (P sub t) = radiated power {measured in space units} lambda = wavelength in same units as d (g sub t) {or g sub [2?]} = power gain of transmitting (or receiving) antenna [half wave dipole has gain of 2.15 db in direction of maximum radiation] ---------- Free Space Field Intensity (E sub 0) = ((square root of ((30)(P {watts} sub t)(g sub t)))/(d {meters})) volts per meter
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Free Space transmission ratio: ((P sub r)/(P sub t)) = (((lambda)/(4(pi)d)) exponent 2)(g sub t)(g sub r) (P sub r) = received power {measured in space units} (P sub t) = radiated power {measured in space units} lambda = wavelength in same units as d (g sub t) {or g sub [2?]} = power gain of transmitting (or receiving) antenna [half wave dipole has gain of 2.15 db in direction of maximum radiation] ---------- Free Space Field Intensity (E sub 0) = ((square root of ((30)(P {watts} sub t)(g sub t)))/(d {meters})) volts per meter
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