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Page 16
... distance of 80 miles over water , using suitable antenna heights . Atmospheric soundings were to be taken from a ship at a point midway along such paths and also on shore as near the midpoint as possible . Measurements with a blimp to ...
... distance of 80 miles over water , using suitable antenna heights . Atmospheric soundings were to be taken from a ship at a point midway along such paths and also on shore as near the midpoint as possible . Measurements with a blimp to ...
Page 26
... distance propa- gation in the 100- to 200 - mc region . 10. Characteristics of propagation in the region between 50 and 500 kc . 11. Tropospheric propagation measurements over various types of terrain and water surfaces to deter- mine ...
... distance propa- gation in the 100- to 200 - mc region . 10. Characteristics of propagation in the region between 50 and 500 kc . 11. Tropospheric propagation measurements over various types of terrain and water surfaces to deter- mine ...
Page 31
... distance apart , d , is large com- pared to the wavelength , the ratio of power trans- mitted to maximum useful power received is found from electromagnetic theory to be P2 Pi 3л 2 = ( 1 ) where λ and d are measured in the same units ...
... distance apart , d , is large com- pared to the wavelength , the ratio of power trans- mitted to maximum useful power received is found from electromagnetic theory to be P2 Pi 3л 2 = ( 1 ) where λ and d are measured in the same units ...
Page 35
... distance from the center of the earth to the level considered . - Το If now we set r = r 。( 1 + h / ro ) where h = r and h / r 。 is a small quantity and , furthermore , if we note that with a linear gradient of n n = no + h dn dh ( 15 ) ...
... distance from the center of the earth to the level considered . - Το If now we set r = r 。( 1 + h / ro ) where h = r and h / r 。 is a small quantity and , furthermore , if we note that with a linear gradient of n n = no + h dn dh ( 15 ) ...
Page 38
... distance from transmitter to receiver . The maxima and minima occur at the positions in space where -WITH DIFFRACTION -WITHOUT DIFFRACTION n h2h2 = λd 4 ( 23 ) HEIGHT DISTANCE FIGURE 9. Coverage diagram for coast line diffraction ...
... distance from transmitter to receiver . The maxima and minima occur at the positions in space where -WITH DIFFRACTION -WITHOUT DIFFRACTION n h2h2 = λd 4 ( 23 ) HEIGHT DISTANCE FIGURE 9. Coverage diagram for coast line diffraction ...
Common terms and phrases
altitude angle antenna attenuation azimuth band Chapter Committee on Propagation computed coverage diagram CUDWR curvature curve decibels decrease diffraction diffraction region distance Division 14 Report earth earth radius effects electromagnetic equation equipment errors experiments factor FEET field intensity field strength forecasting free space frequency functions gradient ground h₁ h₂ height horizontal humidity index of refraction JEIA land layer line of sight lobe maximum measurements meter method microwave miles modes moisture NDRC nomogram nonstandard propagation NRSL obtained operational optical OSRD permanent echoes plane polarization problem radar cross section Radio Propagation Radio Waves radius range receiver reflection coefficient refractive index region Research signal strength Snell's law standard atmosphere standard propagation superrefraction surface target temperature inversion theory tion transmitter Tropospheric United variations vertical water vapor Wave Propagation Wave Propagation Group wavelength weather X band zone