Search Results
The search returned 1,237 publication(s) on its.ntia.gov.
This report documents a spectrum resource assessment of the 1530–1660.5 MHz band. The impact of allocation changes resulting from the WARC-79 are addressed. Information is included on allocations, frequency assignments, system characteristics, and s...
The National Telecommunications and Information Administration (NTIA), in keeping with its responsibility for managing the Government's use of the radio frequency spectrum, researches particular bands when changes in national and/or international al...
This report is a spectrum resource assessment of the Aeronautical Mobile Service between 400 MHz and 17.7 GHz, which addresses the long-range planning of this service. It presents an assessment of 15 Federal Government frequency bands that are alloc...
This report describes an interactive computer program that facilitates efficient measurement of communication system performance parameters. The program performs three primary functions: (1) determines the minimum sample size required to achieve a de...
An engineering approach to the design of optical fiber communication links to meet mandated specifications for performance and interoperability is described. The report follows and expands upon technical guidance originally developed for MIL-STD-188-...
This report constitutes a Spectrum Resource Assessment (SRA) of the band 17.7-40.5 GHz. Included is information on rules and regulations, allocations, technical standards, current and proposed usage, and planning and coordination procedures. Major is...
This report examines the use of Amplitude Compandored Single Sideband (ACSB) and/or 12.5 kHz FM (NBFM) as possible solutions to the spectrum congestion in the Government Land Mobile Service in the VHF bands. These narrowband modulation techniques are...
NTIA and member agencies of the Interdepartment Radio Advisory Committee (IRAC) have long recognized the need for a set of measurement procedures to augment the Radar Spectrum Engineering Criteria (RSEC). In light of this, a Working Party was formed...
Measurements of radio propagation path loss were made over four paths in the 3 to 30 MHz band. The paths were of lengths up to 45 km in the Boulder, CO, area. They ranged from smooth to mountainous terrain, from open areas with few or no man-made str...
The power flux-density (pfd) limits for satellites operating in the 2025–2300 MHz frequency range were calculated. Two computer models, one developed by the Bell Telephone Laboratories (BTL) and the other by the Systematics General Corporation (SGC),...
The attenuation of a received signal on a millimeter wave (above 30 GHz) link probably will be considerably more sensitive to transmitted polarization of the signal than is the case on a microwave (below 30 GHz) link. The introduction of this report ...
Measurements of near-field mutual coupling were performed between two moderate sized microwave antennas and compared to coupling calculated using recently developed computer programs. Input data for the programs are the complex far-field radiation p...
NETWORK is an interactive computer program designed to help the National Weather Service expand the NOAA Weather Radio Network to obtain the desired coverage at minimum spectrum usage. For each active station, areas of predicted service and co-channe...
This paper describes a minicomputer-based communication system monitor used by the U.S. Department of Defense to improve the performance and reduce the operating costs of the new multi-channel digital transmission systems. A brief history of the deve...
Because rain attenuation continues to be a problem for the operation of microwave links worldwide, this report examines the behavior and the prediction of rain rate and rain attenuation·distributions on a worldwide basis. Particular emphasis is pl...
A diagnostic probe designed to investigate propagation at millimeter wavelengths was operated on 11.8 and 27.2-km line-of-sight paths near Boulder, CO. A 30.3-GHz carrier is biphase-shift-keying modulated at a 500 Mb/s with bit error rates less than ...
This report is a spectrum resource assessment of the 162–174 MHz band. Included is information on allocation, frequency assignments and agency equipment usage, along with the results of agency interviews. Present spectrum management techniques and as...
Today, three-quarters of the U.S. employment and one-half of the Gross National Product (GNP) are associated with services. In 1981, services employment predominated, for the first time, over both agriculture and manufacturing, even in the Third Wor...
Absolute attenuation rates due to water vapor and moist nitrogen have been measured in the laboratory at 138 GHz, 282 and 300 K, pressures up to 1.5 atm, and relative humidities from 80 to 100 percent. The computer-controlled measuring system is...
Observations of the F2-region critical frequency, foF2, and values determined from,the time-dependent continuity equation for ions and electrons in the ionosphere have been used to develop a new set of numerical coefficients to represent the global v...