China
Africa
Explore chapters and articles related to this topic
Measurement Systems: Other Components
Published in Patrick F. Dunn, Fundamentals of Sensors for Engineering and Science, 2019
The APRS operates on 144.390 MHz, which is an amateur radio frequency. To use that frequency, one must have a valid technician-class or higher amateur radio license from the Federal Communication Commission (FCC) (see [5] about licensing). Each licensee is given a unique call sign that is used to identify the station.
School Emergency Response Plan Template
Published in Michael L. Madigan, Handbook of Emergency Management Concepts, 2017
Radio Amateur Civil Emergency Service (RACES). A radio communication service conducted by volunteer licensed amateur radio operators, for providing emergency radio communications to local, regional, or state emergency management organizations. FCC 97.163(a).
Measurement Systems: Other Components
Published in Patrick F. Dunn, Michael P. Davis, Measurement and Data Analysis for Engineering and Science, 2017
Patrick F. Dunn, Michael P. Davis
The APRS operates on 144.390 MHz, which is an amateur radio frequency. To use that frequency, one must have a valid technician-class or higher amateur radio license from the Federal Communication Commission (FCC) (see [5] about licensing). Each licensee is given a unique call sign that is used to identify the station.
A Survey of National Disaster Communication Systems and Spectrum Allocation - an Indian Perspective
Published in IETE Technical Review, 2020
Shrayan Das, Kirtan Gopal Panda, Debarati Sen, Wasim Arif
Immediate up-gradation, coordination, and interconnection of POLNET, NICNET, DMS, and NDCN will create a unified network with required coverage and capacity capable of tackling large-scale disasters. At the same time, adoption of GIS and Remote Sensing platforms to map disaster-prone zones and their integration into existing ICT infrastructures may provide a tactical advantage in predicting disasters and handling public safety operations [67]. Meissner et.al [79] discusses such a unified system architecture that may be implemented in the Indian scenario. Integration of advanced early warning systems similar to Emergency Manager Weather Information System (EMWIN) operated by the US National Oceanic and Atmospheric Administration's (NOAA) National Weather Service (NWS), RANET (Radio Internet) systems [80], DEWN - the GSM-based alarm system [71] used in Pacific islands, with existing ICT infrastructure would accelerate disaster preparedness in the country. Commendable progress has been made in Thailand in this regard with the initiation of Open (exchange) for Collaborative Activities in Response to Emergencies (OpenCARE) [81] in the aftermath of Indian Ocean Tsunami of December 2004. It is a decentralized, nearly autonomous network for alert and information exchange linking all electronic mediums including the Internet, leased lines, copper wires, satellite networks, GSM-GPRS and amateur radio. The system is information source independent and highly flexible, enabling simultaneous exchange of information among multiple PPDR agencies.
Low-cost leaky feeder communication for mines rescue
Published in Mining Technology, 2020
Michael D. Bedford, Angel J. A. Rodríguez López, Patrick J. Foster
The transmitter was a Yaesu FT-857D amateur radio transceiver. It was configured to transmit a CW (continuous) signal with an output power of 5W. The cable was hard wired to the transmitter and the end of the cable distant from the transmitter was terminated with a 75 ohm ‘dummy load’ resistor, this being the characteristic impedance of the cables. This corresponds to normal practice with leaky feeders, and is necessary to provide an acceptable match between the transmitter and the cable. The receiver was an Aeroflex 9103 spectrum analyser which was used with a 1.5 m whip antenna in a vertical configuration. The effective noise floor of this configuration, taking into account background noise, varied from −65 dB at 7 MHz to −73 dB at 144 MHz.