14-08-2012, 12:35 PM
SATELLITE DIGITAL RADIO
[attachment=31436]
SATELLITE RADIO
Satellite radio is a subscriber based radio service that broadcast directly from satellites.
It is an advanced form of mobile radio service where one can receive compact disc quality music and other entertainment channels.
Even if the person is miles away from the radio station, the quality of the program is not affected
WorldSpace
Based in Silver Spring
First stated by wanting to improve literacy in Africa
Covers Asia, Europe, and Africa
Licensed to serve Central and South America
AfriStar (serves Africa) and AsiaStar (serves Asia and Europe)
3 transmission beams; 50 channels each
WorldSpace satellite receivers are capable of receiving data at a rate of 128 kilobits per second (Kbps).
GROUND REPEATERS:
Satellite radio reception, poses threats from weather, tall building_ and mountains that can potentially interfere with broadcasts.
To avoid the interference caused by tall structures, both Sirius and XM Radio are supplementing their satellite coverage with terrestrial transmitters, called ground repeaters.
FREQUENCY OF OPERATION
Digital radio is operated in a frequency range of between 215 - 230 MHz (Mega Hertz).
This part of the radio spectrum is sometimes called Band III, or VHF, and was previously used for some television transmissions and by the military.
The central frequency for the BBC National Multiplex is 225.648MHz.
[attachment=31436]
SATELLITE RADIO
Satellite radio is a subscriber based radio service that broadcast directly from satellites.
It is an advanced form of mobile radio service where one can receive compact disc quality music and other entertainment channels.
Even if the person is miles away from the radio station, the quality of the program is not affected
WorldSpace
Based in Silver Spring
First stated by wanting to improve literacy in Africa
Covers Asia, Europe, and Africa
Licensed to serve Central and South America
AfriStar (serves Africa) and AsiaStar (serves Asia and Europe)
3 transmission beams; 50 channels each
WorldSpace satellite receivers are capable of receiving data at a rate of 128 kilobits per second (Kbps).
GROUND REPEATERS:
Satellite radio reception, poses threats from weather, tall building_ and mountains that can potentially interfere with broadcasts.
To avoid the interference caused by tall structures, both Sirius and XM Radio are supplementing their satellite coverage with terrestrial transmitters, called ground repeaters.
FREQUENCY OF OPERATION
Digital radio is operated in a frequency range of between 215 - 230 MHz (Mega Hertz).
This part of the radio spectrum is sometimes called Band III, or VHF, and was previously used for some television transmissions and by the military.
The central frequency for the BBC National Multiplex is 225.648MHz.