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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 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.
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.
Another form of the activity, known as "transmitter hunting", "mobile T-hunting" or "fox hunting" takes place in a larger geographic area, such as the metropolitan area of a large city, and most participants travel in motor vehicles while attempting to locate one or more radio transmitters with radio direction-finding techniques.
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 ...
The loosely coordinated beacon transmitters and receivers, collectively known as the WSPRnet, report the real-time propagation characteristics of a number of frequency bands and geographical locations via the Internet. The WSPRnet website provides detailed propagation report databases and real-time graphical maps of propagation paths. [16]
Benton Harbor Area Schools: Urban gospel WBHL: 90.7 FM: Harrison: West Central Michigan Media Ministries: Religious WBLD: 89.3 FM: Orchard Lake: West Bloomfield School District: Top 40 (CHR) WBLU-FM: 88.9 FM: Grand Rapids: Blue Lake Fine Arts Camp: Classical/Jazz WBLV: 90.3 FM: Twin Lake: Blue Lake Fine Arts Camp: Classical/Jazz WBLW: 88.1 FM ...