FACTOID # 10: The total number of state executions in 2005 was 60: 19 in Texas and 41 elsewhere. The racial split was 19 Black and 41 White.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Carrier current

Carrier current is a method of low-power broadcasting that uses the electrical system of a building to distribute an AM radio signal. This is one method used for college and high school radio, particularly if the signal is only intended to be picked up in a small area. Many established college radio stations originally began as carrier current stations. While the technology is still used by a number of student-run stations today, the popularity declined beginning in the 1980s, as popular music radio formats quickly migrated to the FM band. The popularity of streaming audio over the internet has hastened this decline. Low-power broadcasting is the concept of broadcasting at very low power and low cost, to a small community area. ... Mediumwave radio transmissions (sometimes called Medium frequency or MF) are those between the frequencies of 300 kHz and 3000 kHz. ... College radio (also known as university radio or campus radio) is a type of radio station that is run by the students of a college or university. ... While being popular material for teen-oriented television series and movies, radio stations licensed to American high schools have always been rare. ... // Events and trends The 1980s marked an abrupt shift towards more conservative lifestyles after the momentous cultural revolutions which took place in the 60s and 70s and the definition of the AIDS virus in 1981. ... Popular music is music belonging to any of a number of musical styles that are accessible to the general public and mostly distributed commercially. ... A radio format or programming format describes the overall content broadcast on a radio station. ... Frequency modulation (FM) is a form of modulation which represents information as variations in the instantaneous frequency of a carrier wave. ... Streaming media is just-in-time delivery of multimedia information. ...


Carrier current stations generally only have an effective radiated power of a few watts. Transmitters that use carrier current are very simple, making them an effective option for students interested in radio. Transmissions can be of good quality, although there is reportedly a 60 hertz background hum (in North American installations) associated with carrier current. In radio telecommunications, effective radiated power or ERP is determined by subtracting system losses from system gains. ... The hertz (symbol Hz) is the SI unit of frequency. ... World map showing location of North America A satellite composite image of North America North America is a continent in the northern hemisphere, bounded on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on the west...


Because of the simple design and the fact that the transmitter doesn't need an external antenna, carrier current listening devices have found some use in the world of espionage. Espionage is the practice of obtaining secrets (spying) from rivals or enemies for military, political, or economic advantage. ...


Student-run carrier current stations

This is an incomplete list. Please add to this list if you are aware of an omission. As with most other student-run stations, these stations often operate on sporadic schedules. Most of these stations are also supplemented by other broadcasting methods, such as LPFM, closed circuit, and streaming audio. These stations are NOT licensed by the FCC and their call letters are entirely self-styled. Low-power broadcasting is the concept of broadcasting at very low power and low cost, to a small community area. ... television cameras for surveillance. ... Streaming media is just-in-time delivery of multimedia information. ... The FCCs official seal. ... Call sign can refer to different types of call signs: Airline call sign Aviator call sign Cosmonaut call sign Radio and television call signs Tactical call sign, also known as a tactical designator See also: International Callsign Allocations, Maritime Mobile Service Identity This is a disambiguation page — a navigational aid...


  Results from FactBites:
 
Metal current carrier for electrochemical cell electrodes - Patent 4476002 (5084 words)
A metal current carrier for use in fabricating thin electrochemical cell electrodes comprising a thin metal screen having disposed on one side a thin layer of coarse metal particles which at least partially fill the multiple openings in the metal screen and which are sintered to themselves and to the metal screen.
A metal current carrier according to claim 1 in which the metal particles are of a size that is no greater than one-half the minimum spacing between the wires in the wire mesh nor less than about one-twentieth the minimum spacing between the wires in the wire mesh.
A preferred metal current carrier in accordance with the present invention comprises a thin nickel screen having disposed on one side thereof a thin layer of silver particles which at least partially fill the multiple openings in the nickel screen and which are sintered to themselves and also to the surfaces of the screen.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m