## Historical and technical survey |

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Page 51

They reverse the current through the elements in order to avoid polarization,

while at the same time maintaining constant polarity at the

reversal is 0.5 sec and the 1,000-jif condensers in parallel with the

to ...

They reverse the current through the elements in order to avoid polarization,

while at the same time maintaining constant polarity at the

**meters**. The period ofreversal is 0.5 sec and the 1,000-jif condensers in parallel with the

**meters**serveto ...

Page 111

1X\X2 X (xi + x2) The other symbols in the above expressions have the following

meanings: E = field intensity in microvolts per

intensity in microvolts per

watts, ...

1X\X2 X (xi + x2) The other symbols in the above expressions have the following

meanings: E = field intensity in microvolts per

**meter**, Eo = free space fieldintensity in microvolts per

**meter**_ 3 y/bP X 106 X\ + x2 P = radiated power inwatts, ...

Page 195

Using the numerical value for the radius of the earth, 6.37 X 106 m (21 X 10« ft),

the rate of increase of M with height, owing to the term h/a, is (1/a) 106, which is

equal to 0.157 MU per

...

Using the numerical value for the radius of the earth, 6.37 X 106 m (21 X 10« ft),

the rate of increase of M with height, owing to the term h/a, is (1/a) 106, which is

equal to 0.157 MU per

**meter**(0.048 MU per foot). As the result of a large number...

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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