Radio spectrum is a vital national asset; proper management of this finite resource is essential to the operation and development of telecommunications, radio-navigation, radio astronomy, and passive remote sensing services. To maximize the utility of the radio spectrum, knowledge of its current usage is beneficial. As a result, several spectrum studies have been conducted in urban Atlanta, suburban Atlanta, and rural North Carolina. These studies improve upon past spectrum studies by resolving spectrum usage by nearly all its possible parameters: frequency, time, polarization, azimuth, and location type. The continuous frequency range from 400MHz to 7.2 GHz was measured with a custom-designed system. More than 8 billion spectrum measurements were taken over several months of observation. A multi-parameter spectrum usage detection method was developed and analyzed with data from the spectrum studies. This method was designed to exploit all the characteristics of spectral information that was available from the spectrum studies. Analysis of the spectrum studies showed significant levels of underuse. The level of spectrum usage in time and azimuthal space was determined to be only 6.5 % for the urban Atlanta, 5.3 % for suburban Atlanta, and 0.8 % for the rural North Carolina spectrum studies. Most of the frequencies measured never experienced usage. Interference was detected in several protected radio astronomy and sensitive radio navigation bands. A cognitive radio network architecture to share spectrum with fixed microwave systems was developed. The architecture uses a broker-based sharing method to control spectrum access and investigate interference issues.

Thesis (Ph. D.)--Ohio University, 2003. / Title from PDF t.p. (viewed on Apr. 30, 2006). Includes bibliographical references (p. 272-287).

Community radio typically relies on volunteers to produce and present stations’ programming. Volunteers are generally drawn from stations’ target communities and are seen as “representatives” of those communities. It is with such volunteers and their role as representatives of stations’ target communities that this study is concerned. It poses the question: “what are the central concepts that typically inform volunteers’ knowledge of their target community, and how do these concepts impact on their perception of how they have gained this knowledge, and how they justify their role as representatives of this community?” The dissertation teases out the implications of these conceptualisations for a volunteer team’s ability to contribute to the establishment of a media environment that operates as a Habermasian ‘critical public sphere’. It argues that this can only be achieved if volunteers have detailed and in-depth knowledge of their target community. In order to acquire this knowledge, volunteers should make use of systematic ways of learning about the community, rather than relying solely on knowledge obtained by living there. In a case study of Katutura Community Radio (KCR), one of the bestknown community radio stations in Namibia, the study identifies key differences in the way in which different groups of volunteers conceptualise “the community”. The study focuses, in particular, on such difference as it applies to those who are volunteers in their personal capacity and those who represent non-governmental and community-based organisations at the station. It is argued that two strategies would lead to significant improvement in such a station’s ability to serve as a public sphere. Firstly, the station would benefit from an approach in which different sections of the volunteer team share knowledge of the target community with each other. Secondly, volunteers should undertake further systematic research into their target community. It is also argued that in order to facilitate such processes, radio stations such as KCR should recognise the inevitability of differences between different versions of “community knowledge”.

The ionosphere is an important factor in high frequency (HF) radio propagation providing an opportunity to study ionospheric variability as well as the space weather conditions under which HF communication can take place. This thesis presents the validation of HF propagation conditions for the Ionospheric Communication Enhanced Profile Analysis and Circuit (ICEPAC) and Advanced Stand Alone Prediction System (ASAPS) models over Africa by comparing predictions with the measured data obtained from the International Beacon Project (IBP). Since these models were not developed using information on the African region, a more accurate HF propagation prediction tool is required. Two IBP transmitter stations are considered, Ruaraka, Kenya (1.24°S, 36.88°E) and Pretoria, South Africa (25.45°S, 28.10°E) with one beacon receiver station located in Hermanus, South Africa (34.27°S, 19.l2°E). The potential of these models in terms of HF propagation conditions is illustrated. An attempt to draw conclusions for future improvement of the models is also presented. Results show a low prediction accuracy for both ICEPAC and ASAPS models, although ICEPAC provided more accurate predictions for daily HF propagation conditions. This thesis suggests that the development of a new HF propagation prediction tool for the African region or the modification of one of the existing models to accommodate the African region, taking into account the importance of the African ionospheric region, should be considered as an option to ensure more accurate HF Propagation predictions over this region.

Antoni Ludwicki Development of the radio broadcast news after the World War II Abstract The aim of this thesis is the analysis of changes in style of radio broadcast news in the second half of the 20th century. The main source for this research is the Archive of Czech radio. Theoretical part of this work contains scientific literature and the determination what a radio broadcast news should be like. This part contains also a description of radio broadcasking in Czechoslovakia before the World War II. A significant part of this work contains transcriptions and analyses of recording of radio news. The analysis begins with records from 1968 as no data was found on the research in the Archive of Czech radio before that date. The research was divided into chapters based on historical events. Last part of the analysis of style is the comparison between theoretical and practical research and conclusions. The purpose of this thesis is the analysis of style in radio broadcast news and changes of this style within chosen decades.

No description available.

[pt] Esta é uma pesquisa no campo da Economia Política da Comunicação, que dialoga com os estudos sobre a indústria cultural (ADORNO, HORKHEIMER, BOLAÑO, MAURÍCIO, DUARTE, BENJAMIN). Neste contexto analisa o ocaso da Rádio Globo, importante emissora brasileira, que após 70 anos passou por transformação radical na programação, tendo como base a mudança de público-alvo. A Rádio Globo desprezou os ouvintes que lhe deram sustentação por décadas. Esta alteração de rota trouxe a reboque algumas características classificadas neste trabalho como gentrificação do rádio, por ter um caráter excludente em relação aos mais velhos e mais pobres. A solução para que as emissoras não tomem suas decisões baseadas apenas em estratégias econômicas, seria um modelo com financiamento público. Isto garantiria um acesso democrático e plural aos conteúdos divulgados. Em muitos casos esta gentrificação se manifesta como exclusão digital e uma complementar exclusão do mundo do consumo. / [en] This research deals with the Economic Policy of Communication, which dialogues with studies about cultural industry (ADORNO, HORKHEIMER, BOLAÑO, MAURÍCIO, BENJAMIN). In this context the work goes through an analysis about Radio Globo s sinking. Radio Globo is an important brazilian radio station, which went through a radical schedule grid transformance after more than seventy years of existance. This radical change was based on the will to aim a new target audience. Radio Globo despised the listeners who susteined its existance for decades. This route change brought some new features classified in this dissertation as a radio gentrification, once it excludes old and poor people. The solution to avoid decisions based only on economic strategies would be a public financing model. This should ensure plural and democratic access to the disclosed contents. In many cases this gentrification is shown as digital exclusion and also a complementary exclusion of the consumer society.

ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Emerging and next-generation test instrumentation increasingly relies on network communication to manage complex and dynamic test scenarios, particularly for uninhabited autonomous systems. Adapting wireless communication infrastructure to accommodate challenging testing needs can benefit from reconfigurable radio technology. Frequency agility is one characteristic of reconfigurable radios that to date has seen only limited progress toward programmability. This paper overviews an ongoing project to validate a promising chipset that performs conversion of RF signals directly into digital data for the wireless receiver and, for the transmitter, converts digital data into RF signals. The Software Configurable Multichannel Transceiver (SCMT) enables four transmitters and four receivers in a single unit, programmable for any frequency band between 1 MHz and 6 GHz.

This thesis explores the work of three women practitioners in radio and examines the process of writing radio drama through a mixture of criticism and practice. It analyzes early theories about radio drama and compares them with those of today, in order to ascertain whether the early ideas are still relevant. Starkey points out that radio has been relatively undertheorized (2004: 204), so this evaluation of the practice of writing radio drama adds to knowledge of the medium as a whole. The work focuses on two women practitioners from the past: Hilda Matheson, whose book Broadcasting (1933), was the first single authored text on radio and broadcasting by a woman published in English (Crook 1999: 12) and Mabel Constanduros, who was a prolific writer and actress of the time, specialising in comedy. Matheson s ideas are compared with those of Val Gielgud and other early theorists, which were more accepted at the time. This analysis leads to close examination of a debate at the heart of radio drama, that being whether noises or dialogue are the best method of storytelling. Finally there is a consideration of the author s own writing practice, using three broadcast radio plays, 21 Conversations with a Hairdresser, 15 Ways to Leave Your Lover and Jesus, The Devil and a Kid Called Death. This provides insight into the changing methods of writing for radio. The findings create a story design for writing the Radio 4 Afternoon Drama. Final written drafts are included, along with audio copies of the plays as they were broadcast. Several different types of criticism create the theoretical base, including works on cultural theory, feminist theory and reception theory, as well as texts on radio, screen, play and comedy writing.

International Telemetering Conference Proceedings / October 23-26, 2000 / Town & Country Hotel and Conference Center, San Diego, California / This paper introduces the frequency spectrum characteristic of FM radio broadcast and the message format of RBDS (Radio Broadcast Data System). DGPS correction message in RBDS is described in detail. A design method of RBDS/DGPS system is proposed and the RBDS/DGPS system developed by us is introduced. Finally, some special advantages of RBDS/DGPS system are given.