## Historical and technical survey |

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Page 117

The azimuth of the sun is 180° + 16°10' = 196°10' . A quicker solution may be

Hydrographic Office. The equation of time may be

...

The azimuth of the sun is 180° + 16°10' = 196°10' . A quicker solution may be

**obtained**from a book Azimuths of the Sun, H. 0. 71, published by the U. S. Navy,Hydrographic Office. The equation of time may be

**obtained**from a current copy of...

Page 133

United States. Office of Scientific Research and Development. National Defense

Research Committee. Committee on Propagation. to the two parts of the spiral Z'

to J and K to Z. The resultant amplitude is

...

United States. Office of Scientific Research and Development. National Defense

Research Committee. Committee on Propagation. to the two parts of the spiral Z'

to J and K to Z. The resultant amplitude is

**obtained**by adding the two vectors Z'J...

Page 161

The reflection point is

4hS nX (78) Thus to

the first lobe, substitute n = 1, m = 1 and use the minus sign in equation (77) : d„ ...

The reflection point is

**obtained**by using m = 0 and equation (77) reduces to: d, =4hS nX (78) Thus to

**obtain**the range of the near edge of the first Fresnel zone forthe first lobe, substitute n = 1, m = 1 and use the minus sign in equation (77) : d„ ...

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altitude Anomalous Propagation antenna attenuation azimuth band characteristic values Committee on Propagation computed constant coverage diagram CUDWR curvature curve decibels decrease determine diffraction diffraction region direct distance Division 14 Report duct earth effect elevation equation equipment experiments factor field intensity field strength free space frequency Fresnel zones functions gradient ground height horizontal humidity index of refraction JEIA land layer lobe angles maximum measurements meter method microwave miles mode moisture NDRC nonstandard propagation NRSL obtained operational optical OSRD path difference pattern permanent echoes phase plane plotted polarization problem radar radar cross section Radio Propagation Radio Waves radius range receiver reflection coefficient refractive index region Research signal strength Snell's law standard atmosphere superrefraction target temperature inversion theory tion transmission transmitter trapping Tropospheric variation vertical Wave Propagation Wave Propagation Group wavelength weather X band zone