radio telephone system
61radio and radar astronomy — Study of celestial bodies by measuring the energy they emit or reflect at radio wavelengths. It began in 1931 with Karl Jansky s discovery of radio waves from an extraterrestrial source. After 1945, huge dish antennas, improved receivers and data …
62Radio Television Hong Kong — Infobox Company company name = Radio Television Hong Kong company company type = Government company slogan = Hong Kong s Radio Network foundation = 1928 location = flagicon|Hong Kong 30 Broadcast Drive, Kowloon, Hong Kong key people = industry =… …
63Telephone numbers in Singapore — The Singapore telephone numbering plan, also known as the National Numbering Plan, is regulated by the Numbering Management Department of the Infocomm Development Authority of Singapore (IDA), taking over the role from the Telecommunications… …
64telephone — noun 1》 a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. 2》 an instrument used as part of such a system, typically including a handset with a transmitting microphone… …
65System time — Unix date command In computer science and computer programming, system time represents a computer system s notion of the passing of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system… …
66Telephone numbers in Germany — Country Code: 49 International Call Prefix: 00There are no standard lengths for either area codes or subscribers numbers in Germany, meaning that some subscribers numbers may be as short as three digits. Larger towns have shorter area codes… …
67Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
68mobile telephone — Introduction also called mobile phone portable device for connecting to a telecommunications network in order to transmit and receive voice, video, or other data. Mobile phones typically connect to the public switched telephone network (PSTN)… …
69Mobile radio — This article is about professional equipment. For mobile radios used in amateur radio, see amateur radio mobile operation. Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and… …
70Cordless telephone — A cordless telephone with base. A cordless telephone or portable telephone is a telephone with a wireless handset that communicates via radio waves with a base station connected to a fixed telephone line, usually within a limited range of its… …
