Search Results

The search returned 1,237 publication(s) on its.ntia.gov.

Evan J. Dutton, Harold T. Dougherty, and Duane C. Hyovalti, “Some Models for Rain and Cloud Attenuation of Millimeter Waves,” Technical Report NTIA TR-87-225, November 1987

In the first section of this report, rainfall observational data are processed by least-squares curve-fitting to call attention to some of the desireable aspects of such fittin. The curve fitting techniques are illustrated for annual rainfall and wor...

Hans J. Liebe and Donald H. Layton, “Millimeter-Wave Properties of the Atmosphere: Laboratory Studies and Propagation Modeling,” Technical Report NTIA TR-87-224, October 1987

Laboratory measurements have been performed at 138 GHz of water vapor attenuation αx for pure vapor (H2O) and its mixtures with air, nitrogen (N2), oxygen (O2), and Argon (Ar). Temperatures ranged from 8 to 43 °C, relative humidities from 0 to 95% a...

George A. Hufford, “Millimeter–Wave Pulse Distortion by a Single Absorption Line Simulating the Terrestrial Atmosphere,” Technical Report NTIA TR-87-229, October 1987

Molecular absorption lines in the millimeter-wave band make the atmosphere dispersive, thus causing the distortion of transmitted signal shapes. To better understand how severe this distortion is and what form it takes, it seems useful to examine the...

Karl B. Nebbia, Kenwyn J. Long, and Merton Sussman, “Spectrum Resource Assessment of the Federal Government Fixed Service (Bands above 400 MHz),” Technical Memorandum NTIA TM-87-127, September 1987

This report documents a spectrum resource assessment of the bands allocated to the Federal Government fixed service above 400 MHz on a primary basis. The assessment identifies allocations, standards, channeling plans and technological trends pertaini...

Andrew Farrar and Eugene Chang, “Procedures for Calculating Field Intensities of Antennas,” Technical Memorandum NTIA TM-87-129, September 1987

This report discusses simplified procedures for calculating near and far field intensities of several types of aperture and wire antennas. The antenna technical characteristics listed in the Government Master File (GMF) were reviewed. For this analy...

Raymond D. Jennings, “Investigations of Test Methodology for the Stress Loading Facility,” Technical Report NTIA TR-87-228, September 1987

The U.S. Army Electronic Proving Ground (USAEPG) is planning the development of a new test facility to be known as the Stress Loading Facility (SLF). This facility is envisioned as an integrated and automated test capability that will generate a dens...

Robin H. Haines, “Effects of Planning of the Fixed-Satellite Service on the Fixed and Mobile Services in the 4500–4800 MHz Band,” Technical Memorandum NTIA TM-87-125, August 1987

This report is a study of the potential for sharing in the 4500–4800 MHz band between the fixed-satellite service (FSS) and terrestrial (fixed and mobile) services. The report focuses on decisions of the WARC-ORB-85 concerning planning of the FSS in...

David Middleton, “First-Order Non-Gaussian Class C Interference Models and Their Associated Threshold Detection Algorithms,” Contractor Report NTIA CR-87-39, August 1987

A useful approximate first-order characteristic function for Class C interference is obtained, for arbitrary combinations of the additive Class A and Class B nongaussian components which define Class C noise. From this, in turn, the associated first...

William D. Speights, “NTIA Task Force Measurement Report: Naval Air Test Center, Patuxent River, MD,” Technical Memorandum NTIA TM-87-123, August 1987

This report documents the NTIA Task Force visit to the Naval Air Test Center (NATC), Patuxent River, MD, from January 13 through February 12, 1986, in response to a request from NATC, the Mid-Atlantic Area Frequency Coordinator, and the Navy Interdep...

Jean E. Adams et al., “Performance of Single and Multiple System AM Stereo Decoder Receivers,” Technical Report NTIA TR-87-223, August 1987

In order to determine the feasibility of multiple system decoders for AM stereo receivers, the Institute for Telecommunication Sciences made a series of laboratory and field tests on certain commercially available AM stereo receivers. We also made te...

Gordon A. Crandall III, “Assessment of Digital Radio Voice Protection for Government Land-Mobile Use,” Technical Memorandum NTIA TM-87-122, July 1987

This report documents an effort to measure the operational and performance characteristics of radios equipped with the Data Encryption Standard (DES), as applied to government land-mobile operations.

Eric M. Glasscott, “U.S. Telecommunications Team Report on November 1986 Visit to China: First Implementation Phase of U.S.–China Protocol on Cooperation in the Field of Telecommunications,” Technical Report NTIA TR-87-218, July 1987

This report, an assessment of the telecommunications system in the Peoples’ Republic of China (PRC), identifies areas of technical cooperation in telecommunications sciences between the U.S. and China and recommends strategies for improvement and ex...

George A. Hufford, “A General Theory of Radio Propagation Through a Stratified Atmosphere,” Technical Report NTIA TR-87-219, July 1987

When wave propagation through a stratified atmosphere is formulated in operator theoretic terms, it becomes evident that the problem does not follow the guide of the usual examples of mathematical physics. Nevertheless, such a formulation is useful t...

Eldon J. Haakinson, Susan L. Rothschild, and John R. Godwin, “User’s Guide for the HF Broadcast Antenna Design and Validation Summary Programs,” Technical Report NTIA TR-87-220, July 1987

A series of programs have been developed by the Institute for Telecommunication Sciences (ITS) that assist the Voice of America (VOA) to plan and operate high frequency (HF) broadcast stations. The VOA has specific broadcast bands available for use a...

James A. Hoffmeyer and Martin Nesenbergs, “Wideband HF Modeling and Simulation,” Technical Report NTIA TR-87-221, July 1987

Laboratory testing of proposed and new wideband (e. g., spread spectrum) high frequency (HF) systems is currently not possible because wideband HF channel simulators do not exist. Moreover, there are no validated HF channel models for bandwidth on th...

NTIA Regulatory Review Staff, “NTIA Regulatory Alternatives Report,” Technical Report NTIA TR-87-222, July 1987

NTIA Regulatory Review Staff

National Telecommunications and Information Administration, “A Summary of the Federal Government’s Use of the Radio Frequency Spectrum,” Special Publication, July 1987

This summary, in brief unclassified form, describes the varied requirements for the use of the radio frequency spectrum by the Departments and agencies of the Federal Government. This spectrum dependence has been dictated by the respective mandated f...

William J. Ingram, “A Program Description of FIBRAM: A Radiation Attenuation Model for 0ptical Fibers, June 1987,” Technical Report NTIA TR-87-216, June 1987

This report describes a fiber optics system model and its computer implementation. This implementation can calculate the bit error ratio (BER) versus time for optical fibers that have been exposed to gamma radiation. The program is designed so that t...

James S. Washburn, Leslie A. Berry, and Charles M. Rush, “The HF Broadcasting Planning Model: A Comparison of Two Versions,” Technical Report NTIA TR-87-217, June 1987

The First Session of the World Administrative Radio Conference for the planning of the high frequency (HF) bands allocated exclusively to the broadcasting service held in Geneva, Switzerland, in January and February of 1984, established the technical...

Hans J. Liebe, “Millimeter-Wave Studies of Moist Air,” Contractor Report NTIA USARO 107-86, June 1987

Accurate laboratory measurement of attenuation rates αx over a range from 0.1 to 10 dB/km at 138 GHz for water vapor (H2O) and its mixtures with air, nitrogen (N2), oxygen (O2), and Argon (Ar) have been performed over a temperatures range from 8 to 4...