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RF circuits; transmitters; receivers; antennas; troubleshooting.
Propagation of Radio Waves at Frequencies Below 300 KC/S covers the proceedings of the Seventh Meeting at the AGARD Ionospheric Research Committee, held in Munich, Germany on September 17-21, 1962. This book is organized into eight parts encompassing 32 chapters. The first parts deal with research studies concerning the electron density distribution and some properties of the lower ionosphere, as well as the effect of D-layer irregularities on radio wave propagation. The next parts explore the low frequency propagation in the lower ionosphere, the measurement of oblique incidence, and the statistical frequency spectrum of radio noise below 300 kc/s. The remaining chapters discuss the diurnal changes, the statistical prediction, the mode theory, and the propagation of very and extremely low frequency radio waves in the ionosphere. These chapters also examine the Earth resonance. This book will prove useful to astronomers, astrophysicists, and space scientists.
Astronomical measurements, because of the great distances involved, hold the promise of extremely precise determinations of the relative velocities of electromagnetic waves from the observation of distant events that occur simultaneously or nearly simultaneously at different wave-lengths. The recent observations of optical and radio events in flare stars now provide the basis for such determinations. Table 1 presents the relevent data now available concerning optical and radio events in four flare stars (column 1). The second and third columns contain the stellar parallax and the corresponding time of light travel. Column 4 gives the interval of time in minutes between the first observation of the optical event and the beginning of the radio event. The photographic observations were made at intervals of 2 min with exposures of several seconds. The successive columns contain the radio frequency of observation. (Author).
Sample measurements of times of arrival of Omega signals in the VLF frequency band are reduced to approximate times of propagation and then to the reciprocal of the relative velocity of propagation. A function of the altitude of the sun is then found which, when integrated along the transmission path, yields a synthesis of the transmission time. Two of these functions for two frequencies yield the group transmission time for a difference frequency. It is suggested that this function will make a convenient means for intercomparing data for different paths and different frequencies, in the expectation that corrections can then be made for various factors that have a minor effect upon the speed of propagation. Identification of the importance of these factors should lead to better prediction of the absolute velocity for any path at any time. (Author).
From sound waves to gravitational waves, and from waves of light to crashing rollers on the ocean, Mike Goldsmith explores the fundamental features shared by all waves in the natural world, and considers the range of phenomena resulting from wave motion, including reflection, diffraction, and polarization in light, and beats and echoes in sound.