Telecommunication
The other meaning of the term "channel" in telecommunications is seen in the phrase communications channel, which is a subdivision of a transmission medium so that it can be used to send multiple streams of information simultaneously. For example, one radio station can broadcast radio waves into free space at frequencies in the neighborhood of 94.5 MHz (megahertz) while another radio station can simultaneously broadcast radio waves at frequencies in the neighborhood of 96.1 MHz. Each radio station would transmit radio waves over a frequency bandwidth of about 180 kHz (kilohertz), centered at frequencies such as the above, which are called the "carrier frequencies". Each station in this example is separated from its adjacent stations by 200 kHz, and the difference between 200 kHz and 180 kHz (20 kHz) is an engineering allowance for the imperfections in the communication system.
Goa
DTH (Direct To Home) TV services are available from Dish TV, Videocon D2H, Tata Sky & DD Direct Plus. The All India Radio is the only radio channel in the state that broadcasts on both FM and AM bands. Two AM channels are broadcast, the primary channel at 1287 kHz and the Vividh Bharati channel at 1539 kHz. AIR's FM channel is called FM Rainbow and is broadcast at 105.4 MHz. A number of private FM radio channels are available, Big FM at 92.7 and Radio Indigo at 91.9 MHz. There is also an educational radio channel, Gyan Vani, run by IGNOU broadcast from Panaji at 107.8 MHz. In 2006, St Xavier's College, Mapusa, became the first college in the state to launch a campus community radio station "Voice of Xavier's".