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The search returned 1,237 publication(s) on its.ntia.gov.
The Office of Telecommunications "Telecommunications for Government" conference provides a forum for discussion of selected telecommunications applied research/engineering efforts by representatives of Government Agencies. This third conference focu...
An analog FM microwave radio was tuned and tested to published specifications. Appropriate interface changes were determined and made to permit this radio to handle a 12.6 Mb/s 3-level partial response digital baseband. Pilot, orderwire, and combiner...
HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameter s given are maximum usable frequency (MUF), the optimum traffic frequency (FOT), the lowest useful frequency (LU...
Due to seasonal variations of thunderstorm activity, and owing to the nonstationary conditions of atmospheric radio noise, it generally is not feasible to conduct performance tests of radio communications systems during periods of actual thunderstor...
VOLUME I: HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, availa...
A study of the HF propagation using SSB voice communications for the U.S. Coast Guard's Automated Merchant Vessel Reporting (AMVER), voluntary weather observations n1.ETEO), and search and rescue (SAR) is presented in this paper. Charts of the Atlant...
This report contains a summary of work performed for the United States Information Agency, Voice of America, under contract IA-16744-23 for the period July 1973 through June 1974.
This report is designed to make the significance and usefulness of the CCIR more understandable to the engineer involved in systems planning and in operations. It is prepared in two parts. Part 1 attempts to look at CCIR rather broadly, e. g., from ...
The Office of Telecommunications, Institute for Telecommunication Sciences (OT/ITS), over the past several years, has accumulated a data base of man-made radio noise measurements in the frequency range from 250 kHz through 250 MHz taken in a number ...
We consider a wideband detection problem where the number and structure of the received signal set is arbitrary. A particular spectral weighting approach is taken and the processing results are found to be inadequate. The search for substantially be...
The radiation fields (i. e., elevation patterns) of HF coastal antennas are computed for several possible terrain profiles near land-sea boundaries. The numerical technique for evaluating the radiation fields is compared with analytical formulas if ...
This report reviews the available documentation for two links of the FACSFAC microwave system and the findings of on-site inspections. It is recommended that the present maintenance program be supplemented by additional performance monitoring. This s...
A general statistical-physical model of man-made radio noise processes appearing in the input stages of a typical receiver is described analytically. The first-order statistics of the se random processes are developed in detail for narrow-band recept...
HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P. I. and 30 circuits from their facility at Kava1a, Greece, using the OT/ITS prediction program. The program selects the optim...
The Institute for Telecommunication Sciences provided technical assistance to the Maritime Administration in the development of a digital selective calling system for use by the maritime mobile service. This report summarizes the work performed on th...
The potential interference between systems in the 1535-1660 MHz bands was investigated. This investigation shows that all intersystem interactions could be placed in Serious, Manageable or No Problem categories. The single serious problem results fr...
This user's manual contains a program description of what the "WARC 71.A29" does, a sample calculation, explanations, and instructions for use of the program. Guidance is provided as to the various sources of information needed to operate the program...
The Pacific Basin AMVER communications system was examined over extremes of ionospheric and noise parameters. An analysis was made of the station-frequency pairs available for communicating to 286 simulated ship positions in the area and recommendat...
This memorandum analyzes the effects of changing the present antenna height restrictions on Class D Citizen's Band operations. The ground wave coverage and potential sky wave interference are compared for monopoles and beam antennas at 20, 40, and 6...
HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P. I. and 30 circuits from their facility at Kavala, Greece, using the OT/ITS prediction program. The program selects the optim...