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.
Clarence D. Tuska
Under the provisions of the Radio Act of 1912, most amateur stations were restricted to operating on a wavelength of 200 meters (1500 kHz), which effectively limited their transmitting range to about 25 miles (40 kilometers). In the spring of 1914, Hiram Percy Maxim began promoting the idea of a national organization of amateurs that would transmit messages over greater distances by organizing relays. This resulted in Maxim's incorporation of the American Radio Relay League, with Maxim as president, and Tuska the organization's secretary. At this time Tuska also resigned from the Hartford Radio Club.