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The search returned 1,237 publication(s) on its.ntia.gov.
Several approximations to the attenuation coefficient caused by double knife-edge diffraction are given in terms of the single knife-edge attenuation coefficient. These approximations are evaluated for several typical double knife-edge paths and com...
To assist NAV/SEEC in the evaluation of locations for a NAVCOM receiving site, the Electromagnetic Interference Environment Program Area personnel conducted a field measurement and analysis program. Interference levels from base supported, man-made n...
Most people know that radio, television, long distance telephone, radar, police radio, etc., play important roles in their daily lives. Hany of the more thoughtful are aware that telecommunication services are important, indeed essential, participan...
This report by the Director of Telecommunications Management on Frequency Management within the Executive Branch of the Government contains an appeal for immediate implementation of a major planning program for the future allocation and use of the r...
Vertical radiation patterns of vertical quarter-wave monopoles, and of vertical and horizontal half-wave dipoles located at various heights up to twenty wavelengths over several typical types of ground are shown. Vertical antennas have the best low-...
The theoretical on-axis gains of 134 terminated rhombic antennas are calculated for vertical radiation angles from 0 degrees to 45 degrees.
The characteristics of oblique sounding and backscatter sounding are discussed. The requirements imposed upon antennas for either form of sounding are considered. The available antenna types are reviewed from the standpoint of their suitability for...
This report documents a FORTRAN program which computes the electric field components due to vertical electric or magnetic dipoles. The ground constants and antenna heights are arbitrary. Sample calculations and an annotated listing are included.
A description of several investigations concerning high frequency backscatter is presented. These deal with travelling ionospheric irregularities, topside sounder-bottomside backscatter sounder comparisons, backscatter Doppler observations, ray trac...
Maps and charts are presented giving the world wide distribution and relative occurrence of ducting and superrefractive gradients of the radio refractive index for the atmospheric layer nearest to the surface. Areas with frequent occurrences of duct...
Geographic and frequency dependent distributions of atmospheric noise power enumerated in CCIR Report 322 [1964] are approximated by series expansions for use in electronic computers. Coefficients of Fourier series representation of worldwide geograp...
The various causes of fading and the various kinds of diversity are described. Detailed design procedures are given for the two most popular diversity systems, a redundant technique in which two channels at different frequencies are used and a non-r...
The problem of point-to-point radio communication on the moon is discussed, and equations and curves are presented to estimate power requirements in lunar communication systems. Assuming a smooth surface, consideration is given to ground wave attenu...
A collection of titles and abstracts is presented for articles dealing with the microwave fading that has been observed on tropospheric line of sight paths. Selections are included for related subjects such as: measurement of meteorological factors;...
Objective: To develop the concept for a system which will provide the Naval communication a capability for the selection of best operating frequencies for Navy HF circuits; and for predicting the time of onset, the intensity and duration of ionosphe...
This is the fourth in a series of bibliographies being prepared by the M & GA staff of the American Meteorological Society for the Boulder Laboratories of the National Bureau of Standards. The first three were: 1. Bibliography on Ionospheric Pro...
Central Radio Propagation Laboratory Ionospheric Predictions Based on Numerical Methods of Mapping (formerly CRPL-D series) is described. The Gallet-Jones method of numerical mapping, which is the basis of these predictions, is briefly described. Us...
The proposed experiments described in this report are designed to obtain information concerning the feasibility of tropospheric scatter transmission between an earth terminal and a satellite. These experiments are suggested in lieu of experiments ut...
Radio system parameters are combined with geophysical and ionospheric characteristics to predict the performance of high frequency sky-wave communication circuits through the use of electronic computers. A program is presented to compute Maximum Usa...
The measurements described in this report were sponsored by the U. S. Army Signal Research and Development Laboratory, Fort Monmouth, New Jersey. During the 1961–1962 school year the Midwest Program on Airborne Television Instruction, Inc. (MPATI) t...