receiver-transmitter unit
51Selective calling — SECAL redirects here. For the French wine grape also known as Secal, see Jurançon (grape). In a conventional, analog two way radio system, a standard radio has noise squelch or carrier squelch which allows a radio to receive all transmissions.… …
52Burglar alarm — Silent alarm redirects here. For the album, see Silent Alarm (album). Burglar (or intrusion), fire and safety alarms are all electronic today. Sensors are connected to a control unit via a low voltage hardwire or narrowband RF signal which is… …
53cryptology — cryptologist, n. cryptologic /krip tl oj ik/, cryptological, adj. /krip tol euh jee/, n. 1. cryptography. 2. the science and study of cryptanalysis and cryptography. [1635 45; < NL cryptologia. See CRYPTO , LOGY] * * * Introduction …
54GPO telephones — The United Kingdom s General Post Office (GPO) had a number of telephones that were provided by them for connection to their exchanges. Until 1982 the GPO had a monopoly on the provision of all telephones within the UK and so the range was… …
55telecommunications media — Introduction equipment and systems metal wire, terrestrial and satellite radio, and optical fibre employed in the transmission of electromagnetic signals. Transmission media and the problem of signal degradation Every… …
56Transceiver — For the device used in avalanche rescue, see Avalanche transceiver. A transceiver is a device comprising both a transmitter and a receiver which are combined and share common circuitry or a single housing. When no circuitry is common between… …
57Tone remote — General Electric Mobile Radio, unknown year). This GE manual covers tone and DC remotes. ] [To confirm the use of the phrase tone remote as accurate in describing this type of device, please see US Patent and Trademark Office patent ID 6950653,… …
58Controller area network — Controller–area network (CAN or CAN bus) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer. CAN is a message based protocol, designed specifically for… …
59Coaxial cable — RG 59 flexible coaxial cable composed of: A: outer plastic sheath B: woven copper shield C: inner dielectric insulator D: copper core Coaxial cable, or coax, has an inner conductor surrounded by a flexible, tubular insulating layer, surrounded by …
60Microphone — For the indie film, see Microphone (film). Microphones redirects here. For the indie band, see The Microphones. A …
