. The Bell System technical journal . HORIZONTAL EFFECT ONLY COMPUTED DIRECTIONAL CHARACTERISTIC LENGTH = KM. HEIGHT ABOVE GROUND = KM. ANTENNA DIRECTION = N 78 13W FREQUENCY = 60 KC CHARACTERISTIC IMPEDANCE = —J 174 OHMS ATTENUATION = TU PER KM. VELOCITY RATIO = EFFECTIVE HEIGHT = 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 ANGLES OF INCIDENCE (6) — DEGREES Fig. Sd—Relative Directional Receptivity of Cupar, Scotland—Antenna No. 1 The reason for this can be a
. The Bell System technical journal . HORIZONTAL EFFECT ONLY COMPUTED DIRECTIONAL CHARACTERISTIC LENGTH = KM. HEIGHT ABOVE GROUND = KM. ANTENNA DIRECTION = N 78 13W FREQUENCY = 60 KC CHARACTERISTIC IMPEDANCE = —J 174 OHMS ATTENUATION = TU PER KM. VELOCITY RATIO = EFFECTIVE HEIGHT = 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 190 180 ANGLES OF INCIDENCE (6) — DEGREES Fig. Sd—Relative Directional Receptivity of Cupar, Scotland—Antenna No. 1 The reason for this can be appreciated by reference to Fig. 7, where itis shown that the far end of the long antenna is at the top of a rockyhill; while after shortening, the far end is in a swamp, at the same 334 BELL SYSTEM TECHNICAL JOURNAL average elevation as the remainder of the antenna. The eHminationof this sharp rise over rocky ground serves principally to remove anirregularity in the constants of the wave-antenna near the end, sothat the entire antenna may be considered more nearly a smooth makes the antenna function more satisfactorily as a unit of anarray in connection with other antennas constructed nearby.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
