## Historical and technical survey |

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Page 191

This is taken into account by the use of a divergence

range and heights of transmitter and receiver. 4. The magnitude, p, that the

coefficient of reflection of the ground would have if the ground were plane.

This is taken into account by the use of a divergence

**factor**, D, which depends onrange and heights of transmitter and receiver. 4. The magnitude, p, that the

coefficient of reflection of the ground would have if the ground were plane.

Page 258

If the reflection coefficient is other than unity, it must be multiplied into the general

relation which will be given for C = KLM the net convergence

CONVERGENCE

reflecting ...

If the reflection coefficient is other than unity, it must be multiplied into the general

relation which will be given for C = KLM the net convergence

**factor**. .'7.1CONVERGENCE

**FACTOR**A bundle of rays leaving a transmitter below thereflecting ...

Page 315

... 144-145 prediction of permanent echoes, 137-144 reasons for variations, 135-

136 shielding, 137 testing uses, 135-137 troublesome

theory for M curve in nonstandard propagation, 249-255 abstract, 249 application

...

... 144-145 prediction of permanent echoes, 137-144 reasons for variations, 135-

136 shielding, 137 testing uses, 135-137 troublesome

**factors**, 134 Perturbationtheory for M curve in nonstandard propagation, 249-255 abstract, 249 application

...

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### Common terms and phrases

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