Sorry, you need to enable JavaScript to visit this website.
Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.

Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.

The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Breadcrumb

  1. Home

Publications

Use the filters below to narrow publications by offices, programs or categories

Displaying 181 - 190 of 394

Measurements of Wind Profiler EMC Characteristics

Report ID
93-301
March 01, 1994
Daniel Law, Frank Sanders, Gary Patrick, and Michael Richmond
Abstract

 

This report provides the results of measurements that were conducted on a 404.37 MHz wind profiler located in Platteville, Colorado. These measurements included: radiated spectra (both high and low mode), radiated harmonic and subharmonic power measurements, characterization of the antenna frequency response, determination of the radiated antenna gain values near ground level, susceptibility of profiler performance to interference from selected emission waveforms, and the effects on a typical land mobile/amateur operation from wind profiler emissions. In addition, the report presents a detailed wind profiler system description including operations/functions, system hardware, digital signal processing, as well as an
analytical estimation of the interference effects on profiler performance. The information contained within this report can serve as an aid in conducting electromagnetic compatibility (EMC) analysis to determine compatibility between wind profilers and other systems.

Evaluation of Discrete Address Beacon System (DABS) EMC

Report ID
80-53
November 03, 1980
Robert Pratt and Jay Levy

The FAA is currently developing the Discrete Address Beacon System (DABS) as an evolutionary upgrading of the Air Traffic Control Radar Beacon System (ATCRBS). Questions have been raised regarding the Electromagnetic Compatibility (EMC) of ATCRBS and DABS because of their common channel usage. The committee on Science and Technology, U.S. House of Representatives, requested that the National Telecommunications and Information Administration (NTIA) review DABS as a radio telecommunication system giving particular attention to potential interference problems.

Progress towards BTOP Goals: Interim Report on PCC and SBA Case Studies

December 05, 2012
ASR Analytics, LLC

On September 20, 2010, the Department of Interior National Business Center’s Acquisition Services Directorate (AQD) on behalf of the National Telecommunications and Information Administration (NTIA) awarded a task order to ASR Analytics, LLC to obtain services to complete an Evaluation Study of the Broadband Technology Opportunities Program (BTOP).

A Guide to the Use of the ITS Irregular Terrain Model in the Area Prediction Mode

Report ID
NTIA REPORT 82-100
April 01, 1982
George A Hufford, Anita G. Longley, and William A. Kissick
Abstract

The ITS model of radio propagation for frequencies between 20 MHz and 20 GHz (the Longley-Rice model) is a general purpose model that can be applied to a large variety of engineering problems. The model, which is based on electromagnetic theory and on statistical analyses of both terrain features and radio measurements, predicts the median attenuation of a radio signal as a function of distance and the variability of the signal in time and in space.
 
The model is described in the form used to make "area predictions" for such applications as preliminary estimates for system design, military tactical situations and surveillance, and land-mobile systems. This guide describes the basis of the model, its implementation, and some advantages and limitations of its use. Sample problems are included to demonstrate applications of the model.
 

Third Interim Progress Report on the Ten-Year Plan and Timetable

November 29, 2012

NTIA submits this Progress Report pursuant to the Presidential Memorandum issued on June 28, 2010, which directed the Department of Commerce, working through NTIA and in collaboration with the Federal Communications Commission (FCC), to identify and make available 500 megahertz of spectrum over the next ten years for expanded wireless broadband use.

Analysis and Resolution of RF Interference to Radars Operating in the Band 2700-2900 MHz from Broadband Communication Transmitters

Report ID
NTIA Technical Report TR-13-490
October 31, 2012
Frank H. Sanders, Robert L. Sole, John E. Carroll, Glenn S. Secrest, T. Lynn Allmon

Abstract: This report describes the methodology and results of an investigation into the source, mechanism, and solutions for radiofrequency (RF) interference to WSR-88D Next-Generation Weather Radars (NEXRADs). It shows that the interference source is nearby base stations transmitters in the Broadband Radio Service (BRS) and the Educational Broadband Service (EBS) and that their out-of-band (OOB) emissions can cause interference on NEXRAD receiver frequencies.

Antenna Models For Electromagnetic Compatibility Analyses

Report ID
NTIA TM-13-489
October 26, 2012
C.W. Wang, T. Keech
Abstract

This technical memorandum contains recommendations for antenna models that can be used in performing electromagnetic compatibility (EMC) analysis related to spectrum management. The technical memorandum contains two compilations of antenna parameters. The first one is the collection of rules, regulations, and recommendations regarding antennas that are published by regulators, as well as improving, EMC. NTIA conducted an extensive review and analysis of the existing rules, regulations, and recommendations and compiled the findings in this technical memorandum. The second compilation is the recommendations of antenna parameters for spectrum managers to use in conducting EMC analysis associated with: system review for equipment approval, frequency assignment, and spectrum sharing studies. NTIA evaluated the characteristics of the radio services, the federal usage of the radio spectrum, and the technical merit and practicality of the antenna parameters in the rules, regulations, and recommendations, and then developed recommendations of antenna parameters for conducting these EMC analysis tasks of all of the radio services.
 

SUMMARY OF PUBLIC OUTREACH EFFORTS CONCERNING STATE AND LOCAL PUBLIC SAFETY SPECTRUM MANAGEMENT POLICIES & PROCEDURES

May 03, 2004
William D. Speights, Richard Orsulak
Abstract

As required by the President’s Executive Memorandum on the Spectrum Policy Initiative, the Department of Commerce, through NTIA, conducted outreach in the form of public meetings to help in the development of recommendations to improve the public safety spectrum management process. Two separate events were held to solicit input. The first meeting, a Roundtable discussion with State and local public safety frequency coordinators, national public safety organizations, and public safety agencies, was held on November 12, 2003. The second meeting, held on February 10-11, 2004, included a much broader participation from the public safety community, academia, manufacturers, and the general public.

From these meetings, a comprehensive set of findings was extracted and are represented below. Specific supporting findings are detailed in Section 3. The combined findings of these two outreach efforts should be considered as broad in scope based on a limited investigation into the spectrum management issues of State and local public safety as they related to the four objectives in the memorandum. They are generally representative of the public safety community, but are not intended to be a finite and limiting set. Throughout the United States, there are reportedly as many as 55,000 public safety agencies of varying size, mission, and structure. Each has unique problems and solutions regarding its own communications requirements, issues and solutions. It may be unfair and unrealistic to assume that these findings are completely representative of this extraordinarily large base of users.

Final Report of the Public Safety Wireless Advisory Committee

September 11, 1996
Abstract

This report represents the best efforts of the Public Safety community to define and document its critical need for communications resources and the spectrum which will support them — now and through the year 2010. The Final Report concludes that, unless immediate measures are taken to alleviate spectrum shortfalls and promote interoperability, Public Safety agencies will not be able to adequately discharge their obligation to protect life and property in a safe, efficient, and cost effective manner.

Fourteenth Quarterly Status Report to Congress Regarding BTOP

October 04, 2012

Pursuant to Section 6001(d)(4) of the American Recovery and Reinvestment Act of 2009 (ARRA or Recovery Act) (Public Law No. 111-5), the National Telecommunications and Information Administration (NTIA) provides this Quarterly Report on the status of the Broadband Technology Opportunities Program (BTOP or Program). This Report focuses on the Program’s activities from April 1 to June 30, 2012.