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John F. Clark

dblp:167/4760 · DBLP profile ↗
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1ranked-venue papers
1as first author
0since 2021 · last 1985
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Computer networks · 1 · 1 first-author

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Computer networks
1 paper
Vehicular, aerial and satellite networks · 100%

Topics — the 2 heaviest of 2, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Vehicular, aerial and satellite networks › satellite communication
direct broadcast satellite
0.011985
DBS Television Systems Under Development in the United States of America · IEEE J. Sel. Areas Commun. 1985
Vehicular, aerial and satellite networks › satellite communication
satellite broadcasting
0.011985
DBS Television Systems Under Development in the United States of America · IEEE J. Sel. Areas Commun. 1985
YearPublicationVenuePosition
1985 DBS Television Systems Under Development in the United States of America
abstract
Three types of direct-to-home broadcast satellite (DBS), or "DBS-like," services are currently being developed or used in the United States. The earliest service to be used depends upon low-power 5-10 W 6/4 GHz2satellite transponders, which operate in the fixed-satellite service (FSS) to provide predominantly unscrambled TV programs to cable head ends and other local terrestrial distribution systems. Some 600000 viewers are using individual 3 m "dishes" to eavesdrop on scores of "free" channels. The second DBS service to begin operation uses dedicated medium-power 14/11 GHz FSS transponders, which provide subscription service to some 10000 home terminals equipped with antennas in the 1-2 m diameter range. Finally, the high-power DBS service, which is under active development using the 17/12 GHz broadcasting-satellite service (BSS) band, can provide high-quality television pictures from dedicated 200 W satellite transponders to inexpensive home terminal antennas as small as 60 cm. Which service-low-, medium-, or high-power-is best? The home terminal equipment cost decreases as the transponder power increases, for the same picture quality and area of coverage. However, more varied and less costly programming is available now in the 6/4 GHz band than in the higher-frequency bands. From the viewer's perspective, continued competition between these services, and with other home video delivery services such as CATV and prerecorded cassettes, should provide the best choice of programming at the least cost. From the more challenging perspective of the DBS system operator, the best means to this desirable end will depend on the number of viewers, on the programming quality, cost, and availability to the operator, on the cost of the space segment, and on the obstrusiveness and cost of the home terminal.
John F. Clark
IEEE J. Sel. Areas Commun.1