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.


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.


  1. Home

Spectrum Engineering Reports

NOTE: These reports are available either on-line in PDF (portable document) format or only as hard-copy. If you would like a copy of a report that is not available electronically, please make note of the document number and submit your request to:

NTIA Office of Spectrum Management
System Engineering and Analysis Division
Tel. (202) 482-2608
Fax (202) 482-4595

Report to the President: Identification of 15 MHz of Spectrum Between 1675 MHz and 1710 MHz for Reallocation

February 19, 2013

As directed by Congress in Section 6401(a)(3) of the Middle Class Tax Relief and Job Creation Act of 2012 (Tax Relief Act), NTIA submitted a report to the President identifying 15 megahertz of spectrum between 1675 MHz and 1710 MHz for reallocation from federal use to non-federal use. 

Evaluation of the 5350-5470 MHz and 5850-5925 MHz Bands

January 25, 2013

Through this report, the National Telecommunications and Information Administration (NTIA) presents the results of its initial study on the potential use of up to 195 megahertz of spectrum in the 5 gigahertz (GHz) band by Unlicensed-National Information Infrastructure (U-NII) devices. Pursuant to Section 6406(b)(1) of the Middle Class Tax Relief and Job Creation Act of 2012 (Tax Relief Act), NTIA, in consultation with the Department of Defense and other impacted agencies, assessed known and proposed spectrum-sharing technologies. This study also evaluated the risk to federal users if the Federal Communications Commission (FCC) allows U-NII devices to operate in the 5350-5470 MHz and 5850-5925 MHz bands.

Spectrum Resource Assessment in the 2.7 to 2.9 GHz Band Phase II: Measurements and Model Validation (Report No. 1)

Report ID
OT Report 76-97
August 01, 1976
Robert L. Hinkle, Robert M. Pratt, and Robert J. Matheson

The Office of Telecommunications (OT) undertook a detailed program to measure and analyze spectrum utilization in the 2.7. to 2.9 GHz band in the Los Angeles and San Francisco areas in support of an Office of Telecommunications Policy (OTP) Spectrum Resource Assessment task. The measurement program consisted of on-site visits to compare predicted and actual PPI interference patterns, and utilization of the Radio Spectrum Measurement System (RSMS) van to validate the component models used in predicting radar-to-radar interference.

From the measured data and a supporting literature search, it was concluded that ducting and man-made clutter (building attenuation) should be included in the propagation loss predictions in order to improve the prediction accuracy of radar-to-radar interference and radar frequency assignments. Even though potential multipath wave interference conditions can be identified, to account for this analytically would require and extremely complex antenna and terrain model. Due to modeling inaccuracies, the difference between the predicted and actual radar-to-radar Interference-to-noise Ratio (INR) levels may be as large as 22 dB (2σ standard deviation region). However, INR errors of approximately 25 dB can still result in relatively accurate predictions of interference patterns on the victim PPI display for conditions where mainbeam-to-backlobe antenna coupling predominates. In summary, it was concluded that the analytical radar-to-radar interference techniques used in this investigation can be used to predict interference patterns on the victim radar PPI display with sufficient accuracy to allow assessment of radar band congestion, frequency assignment flexibility, and potential of the band to absorb new users.

Measurements of Wind Profiler EMC Characteristics

Report ID
March 01, 1994
Daniel Law, Frank Sanders, Gary Patrick, and Michael Richmond


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
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.

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

Report ID
April 01, 1982
George A Hufford, Anita G. Longley, and William A. Kissick

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

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.