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The NRQZ includes portions of West Virginia and Virginia and a small part of Maryland. The National Radio Quiet Zone (NRQZ) is a large area of land in the United States designated as a radio quiet zone, in which radio transmissions are restricted by law to facilitate scientific research and the gathering of military intelligence.
Individual officers communicate with radio operators in nearby police stations, while police vehicles communicate with their prefectural police's communications command centers, located at prefectural police headquarters. [9] In Japan, police radio frequencies are encrypted and are illegal for civilians to access.
The LAPD's deployment of officers has reflected the growth and changes of Los Angeles since the late 19th century. The earliest LAPD police station (or community station or division, originating from the "Patrol Division") was Central Division, located in Downtown Los Angeles on the southeast corner of 1st and Hill.
Adjacent frequencies are often used by illegal operators using modified CB or amateur radio equipment. Operators sometimes refer to this activity as freebanding . The Industrial/Business Radio Pool of the Private Land Mobile Radio Services has several channels just above the Citizen's Band, at 27.430, 27.450, 27.470, 27.490, 27.510, and 27.530 MHz.
Unlike a conventional radio which assigns users a certain frequency, a trunk system uses a number of frequencies allocated to the entire system. Then the control channel coordinates the system so talkgroups can share these frequencies seamlessly. The purpose is to dramatically increase system capacity with optimal use of frequencies.
The same radio frequency may be used at many sites throughout the state. Of the many individual tower sites, simulcast groups cover the Chicago, St. Louis, Peoria and Rockford metro areas. These simulcast sites allow for better coverage over a large area by transmitting the same conversation on the same frequencies at each tower in the ...
Specific Area Message Encoding (SAME) is a protocol used for framing and classification of broadcasting emergency warning messages. It was developed by the United States National Weather Service for use on its NOAA Weather Radio (NWR) network, and was later adopted by the Federal Communications Commission for the Emergency Alert System, then subsequently by Environment Canada for use on its ...
In the Americas (defined as International Telecommunication Union (ITU) region 2), the FM broadcast band consists of 101 channels, each 200 kHz wide, in the frequency range from 87.8 to 108.0 MHz, with "center frequencies" running from 87.9 MHz to 107.9 MHz. For most purposes an FM station is associated with its center frequency.