Showing papers on "Mobile telephony published in 1969"
TL;DR: A digital radio dispatch system for control of mobile forces offers improvements over some of the shortcomings of existing voice systems while still retaining voice communication for emergency and special mobile-originated messages.
Abstract: A digital radio dispatch system for control of mobile forces offers improvements over some of the shortcomings of existing voice systems. The four functions involved in dispatching--- signaling, message, acknowledgment, and status---are described. Both the remote station and control center operations are described with emphasis placed on message format and timing. Polling controls the mobile tracsmissions for automatic acknowledgment status and other common messages. Such a system can assume the bulk of dispatch communications with the speed and security of digital communication while still retaining voice communication for emergency and special mobile-originated messages.
2 citations
TL;DR: In this paper, the use of walkie-talkie radios to supplement fixed wire interior communications systems on ships is discussed, and many other problems were found to exist when alternate interim solutions to a man-on-the-move communication (MOMCOM) problem were tried on the U.S. Mars (AFS-1).
Abstract: The use of walkie-talkie radios to supplement fixed wire interior communications systems on ships is discussed. Electrical and acoustical noise interference problems were studied on replenishment ships, and the use of FM at VHF together with noiseproofed acoustic transducers was found necessary for many operations and/or for men in certain locations. RF signal penetration tests showed VHF to be superior to HF for reliable communications between certain interior spaces and the weather decks. In some cases antennas with coaxial lead-ins had to be provided to maintain adequate communications. These and many other problems were found to exist when alternate interim solutions to a man-on-the-move communication (MOMCOM) problem were tried on the U.S.S. Mars (AFS-1). In addition to finding a workable interim system, many problems and some answers were uncovered that will lead to a better integrated MOMCOM system for future ships.
1 citations
TL;DR: Forward error-correction equipment based on cyclic coding, which is applicable for selective calling and direct-printing systems in the maritime mobile service, is described.
Abstract: Forward error-correction equipment based on cyclic coding, which is applicable for selective calling and direct-printing systems in the maritime mobile service, is described. Some field test results are presented.