Interference and Sharing at Medium Frequency: Skywave Propagation Considerations

Wang, John C. H.

doi:10.1109/tbc.1983.266490

Cited by 6 publications

(2 citation statements)

References 8 publications

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“…Furthermore, the frequency term in this method indicates that the higher the frequency is, the lower the field strength is. Although this is theoretically sound, measured data from Brazil, New Zealand, and the United States, however, do not corroborate this term [CCIR, 1990;Wang, 1983]. Indeed, this method was a great step forward from the two previous methods.…”

Section: Udaltsov and Shlyuger Methodsmentioning

confidence: 87%

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An objective evaluation of available LF/MF sky‐wave propagation models

Wang¹

1999

Radio Science

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Abstract. This paper presents results of an extensive comparative study in which all four major field-strength prediction methods are compared with measured data. The most recent data bank has been used. These methods are analyzed in detail. Factors affecting sky-wave propagation are discussed. Some historical background is also presented. IntroductionThe purpose of this paper is to evaluate the currently used LF/MF sky-wave propagation models. A brief historical background, including some major worldwide field-strength measurement campaigns, is presented in section 2. The most up-to-date and largest data bank has been organized and studied and used in this study. Factors affecting sky-wave propagation and some observed phenomena are discussed in section 3. Currently used methods for predicting field strengths are qualitatively discussed in section 4 and quantitatively compared in section 5. Historical Background: Six Decades of Concerted EffortsIn this section a brief historical background behind the currently used field-strength prediction models is given. This is important for two reasons: to document some valuable historical facts and, more importantly, to help the users to select the right propagation models for their particular applications. The two curves were formally adopted at the 1938 Early International Efforts and the Cairo

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Section: Udaltsov and Shlyuger Methodsmentioning

confidence: 87%

“…For example, the signal of a 1530 kHz station is about 15 dB stronger than that of a 700 kHz station at sunset or sunrise. At 6 hours after sunset the difference is only about 3 dB in favor of the higher frequency [Wang, 1983]. See also section 3.7.…”

Section: Diurnal Variationmentioning

confidence: 89%

An objective evaluation of available LF/MF sky‐wave propagation models

Wang¹

1999

Radio Science

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Propagation of Broadcast Transmissions

Wang

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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The sections in this article are Ground‐Wave Propagation The Sky‐Wave Propagation Environment Sky‐Wave Propagation at LF and MF Sky‐Wave Propagation at High Frequency Space‐Wave Propagation at VHF and UHF Acknowledgments and Closing Remarks Glossary

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Solar activity and MF skywave propagation

Wang

1989

IEEE Trans. on Broadcast.

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Interference and Sharing at Medium Frequency: Skywave Propagation Considerations

Cited by 6 publications

References 8 publications

An objective evaluation of available LF/MF sky‐wave propagation models

An objective evaluation of available LF/MF sky‐wave propagation models

Propagation of Broadcast Transmissions

Solar activity and MF skywave propagation

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