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.
Radio One (New Zealand)
In the station's early years, its 100 Watt transmitter was located on the top of the campus's tallest building (the 11-storey Richardson Building, then known as the Hocken Building), but since the late 1980s it has had a transmitter on the top of Mount Cargill, 12 kilometres north of the campus. This gives the station a range which covers much of coastal Otago, from Oamaru to past Balclutha.