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Showing: 1 to 7 of 7 matches for "UHF VHF"  Page   1 TITLE Field Site Data Processing: A High-Frequency Radio Communication Link Between Field Camp and Computer  SUMMARY ... Both the UHF and VHF bands have been used successfully for the transmission of digital data, but, in general, the com- munications links are line-of-sight ... AUTHOR Botbol, Joseph Moses PUBLISHED 1976 TITLE Completion of H-3 Highway Tunnel  SUMMARY ... Telephone Yes Yes Fire/Smoke Alarms Yes Yes Radio - AM/FM & Rebroadcast Yes No Radio - UHF/VHF Yes Yes Radio - 800 MHz Yes Yes Overheight Detection Yes No ... AUTHOR Richardson, Thomas L. ; Reichelderfer, Jan L. PUBLISHED 2001 TITLE VLF Emergency Warning System for Underground Mining  SUMMARY ... Very High frequency (VHF) and Ubhigh frequency (UHF) systems have negligible throughtherock transmission czb pabilities and are limited to line-of-sight ... AUTHOR Vanderlaag, J. Herman P. Eng. ; McDougall, J. Scott PUBLISHED 1995 TITLE Evolution of RFID technology in underground coal mines  SUMMARY ... which has resulted in very limited operating ranges for RFID readers. VHF and UHF systems have longer line-of-sight ranges but are more orientation sensitive. ... AUTHOR Unal, A. ; Grayson, R. L. PUBLISHED 1999 TITLE Off-Highway Vehicles Monitoring At Surface Coal Mines In Western Canada  SUMMARY ... The cluster shares 7 RA81 disk drives.A two channel UHF FM two way ... Location beacons are small solar powered VHF transmitters located along the haul road network ... AUTHOR Srajer, Val ; Szymanski, J. K. PUBLISHED 1989 TITLE Evolution Of RFID Technology In Underground Coal Mines – Preprint 97-181  SUMMARY ... 996) reports on the plans of Tunnel Radio of America to offer high-power UHF radio systems which transmit three to four times further than VHF radio equipment ... AUTHOR Unal, Ahmet ; Grayson, R. Larry PUBLISHED 1997 TITLE SAMARCO’s 396 km Pipeline A Major Step in Iron Ore Transportation  SUMMARY ... is provided by a microwave system with five intermediate relay sites, VHF and HE ... One by hardwire and the rest of the system through the UHF microwave system. ... AUTHOR Jennings, Milton E. PUBLISHED 1982 Showing: 1 to 7 of 7 matches for "UHF VHF"  Page   1 Search Again