Wednesday, November 24, 2010

Public Media Broadcasting Frequency

» Amplitude modulation (AM) radio: AM radio stations operate at a frequency band between 520 and 1605.5 KHz.

» FM radio: It uses the frequency band between 87.5 and 108 MHz.

» Shortwave (SW) radio: SW radio uses frequencies between 5.9 and 26.1 MHz within the HF band. The transmission of shortwave radio over a long distance is made possible by ionosphere reflection. HAM amateur radio, a popular activity enjoyed by over three million fans worldwide, relies on the HF band to communicate across the world.

» Conventional analog television: A quite small slice of VHF (30 – 300 MHz) and UHF (300 – 3000 MHz) has been allocated for analog television broadcasting. In the United States, each channel occupies a 6-MHz band. The first VHF channel, channel 2, operates at 54– 60 MHz, whereas the last UHF channel, channel 69, operates at 800– 806 MHz.

» Cable television: The frequency bands of channels 2 – 13 are exactly the same for both conventional television and cable television. Beyond those channels, cable television requires frequencies from 120 to 552 MHz for channels 13 – 78.

» Digital cable television: Channels 79 and above are reserved for digital cable broadcasting at frequencies between 552 and 750 MHz.

» Digital audio broadcasting (DAB): DAB is a standard developed by the EU for CDquality audio transmission at frequencies from 174 to 240 MHz and from 1452 to 1492 MHz. In the United States, a technique called in-band on-channel (IBOC) is used to transmit digital audio and analog radio signals simultaneously with the same frequency band. The resulting services are generally marketed as high-definition radio.

» Direct broadcast satellite (DBS): The upper portion of the microwave Ku band (10.9 – 12.75 GHz) is used for direct satellite-to-receiver video and audio broadcasting.

» Satellite radio: Frequencies from 2320 to 2345 MHz have been allotted for satellite radio services in the United States.

Source of Information : Elsevier Wireless Networking Complete 2010
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