Spectrum Engineering Reports

The Federal Government Spectrum Usage in the 902-928, 2400-2500 and 5725-5875 MHZ Bands report was released in February 1993. This report assesses the Federal Government spectrum usage of these three bands. Current rules and regulations, allocations, and major systems currently operating or planned for operation in each of the bands, as well as systems' deployments and some technical characteristics are identified. Major non- government application of special systems is also addressed whenever data is available.

The Digital Emission Spectrum Model report was released in September 1993. A computer program was developed to calculate the power spectral density (PSD) and the fractional power containment bandwidth for various digital modulation techniques. The power containment capability was used to provide guidance for determination of necessary bandwidth in support of Annex J of the NTIA Manual. This report documents the models contained in the computer program and illustrates the models with various sample problems. The report also shows the verification of the computer program implementation.

The Land Mobile Spectrum Efficiency - A Plan for Federal Government Agencies to use More Spectrum-Efficient Technologies report was released in October 1993. The IRAC established the Ad Hoc 210 committee to provide a forum for Federal Government agency member-representatives to present their views on telecommunication policies dealing with mobile systems. This committee provided extensive assistance to NTIA in the development of this study and plan. They described requirements of government departments and agencies for mobile radio communication services, and provided both technical and policy comments on the material drafted by NTIA technical staff. Their descriptions of technical requirements and discussions of the policy issues, and the practicality of implementing some of the proposals, contributed greatly to the initial draft of the study and plan. IRAC approved a draft of this study and plan based on the work of Ad Hoc 201. The study was then reviewed by NTIA, Department of Commerce and Congressional Senior Staff members. Their comments led to clarifications and amplifications of the proposed plan and procedures included in this report.

The National Land Mobile Spectrum Requirements report was released in January 1994. This report describes the Federal Government's land mobile radio (LMR) usage and trends in the following bands: 30-50, 138-150.8, 162-174, 220-222 and 406.1-420 MHZ. It also presents public (common carriers such as cellular radiotelephone and radio paging), and private sector (including state and local government) uses from 25 MHZ to 1 GHz, related regulatory issues and trends in the land mobile services. The report also contains a discussion on personal communications services. zo, E. Response to Title VI - Omnibus Budget Drocella, E.F., Jr. Reconciliation Act of 1993 Scammon, C. The Preliminary Spectrum Reallocation Report was released on February 10, 1994. This report, prepared in response to Title VI of the Omnibus Budget Reconciliation Act of 1993, identified 235 MHZ of radio spectrum for transfer from Federal Government use to private, commercial use. The report marks the first step in a process that will lead the way to major changes in U.S. Management of the radio spectrum.

The Preliminary Spectrum Reallocation Report was released on February 10, 1994. This report, prepared in response to Title VI of the Omnibus Budget Reconciliation Act of 1993, identified 235 MHZ of radio spectrum for transfer from Federal Government use to private, commercial use. The report marks the first step in a process that will lead the way to major changes in U.S. Management of the radio spectrum.

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 sub-harmonic 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.

The Radio Spectrum Measurements of Individual Microwave Ovens report was released in March 1994, consisting of Volumes 1 and 2. This report provides results of radio spectrum measurements of 13 individual microwave ovens performed at the NTIA, Institute for Telecommunication Sciences (ITS). Measurements include emission characteristics and time waveforms covering the frequency range 2300-2600 MHZ and oven emission characteristics of harmonic frequency ranges up to the 7th harmonic. Test parameters were varied to identify their impact on test results. These parameter variations include such factors as cooking load, start temperature, oven orientation, and receiver bandwidth. Test procedures of the Federal Communications Commission (FCC), the International Special Committee on Radio Interference (CISPR), and additional procedures developed by NTIA and ITS are also discussed.

The Radio Spectrum Measurements of Individual Microwave Ovens report was released in March 1994, consisting of Volumes 1 and 2. This report provides results of radio spectrum measurements of 13 individual microwave ovens performed at the NTIA, Institute for Telecommunication Sciences (ITS). Measurements include emission characteristics and time waveforms covering the frequency range 2300-2600 MHZ and oven emission characteristics of harmonic frequency ranges up to the 7th harmonic. Test parameters were varied to identify their impact on test results. These parameter variations include such factors as cooking load, start temperature, oven orientation, and receiver bandwidth. Test procedures of the Federal Communications Commission (FCC), the International Special Committee on Radio Interference (CISPR), and additional procedures developed by NTIA and ITS are also discussed.

This paper provides definitions of spectrum efficiency for general communication systems, then simplifies the definitions so that the spectrum efficiency of several contemporary mobile radio systems can be easily compared.