standard frequency and time signals
61List of Doctor Who universe creatures and aliens — This is a list of fictional creatures and aliens from the universe of the long running BBC science fiction television series Doctor Who, including Torchwood, The Sarah Jane Adventures and K 9. It covers alien races and other fictional creatures,… …
62Télé Distribution Française — Télé Diffusion de France, or TDF, is a time signal service, broadcast on longwave radio by the French Laboratoire primaire du temps et des frequences (LPTF). This time signal is generated by an extremely accurate caesium fountain atomic clock.… …
63Army Communications and Information Systems (United Kingdom) — The British Army operates a wide range of communications and information systems [ [http://www.army.mod.uk/3512.aspx Royal Signals Equipment] ] . Some of these are specialised military systems, while others are procured off the shelf. They fall… …
64One-time pad — Excerpt from a one time pad In cryptography, the one time pad (OTP) is a type of encryption, which has been proven to be impossible to crack if used correctly. Each bit or character from the plaintext is encrypted by a modular addition with a bit …
65London, Tilbury and Southend Railway — London Tilbury Southend Line Class 357 unit between Barking and Upminster. Overview Type Commuter rail, Heavy rail …
66Drop and insert — In a multichannel transmission system, a drop and insert is a process that diverts (drops) a portion of the multiplexed aggregate signal at an intermediate point, and introduces (inserts) a different signal for subsequent transmission in the same …
67Nuclear weapons and the United Kingdom — United Kingdom Nuclear program start date 10 April 1940 First nuclear weapon test 2 October 1952 First fusion weapon test …
68List of Doctor Who monsters and aliens — This is a list of monsters and aliens from the long running BBC science fiction television series Doctor Who . The list includes some races which are not extraterrestrial, but are nonetheless non human. This list is meant to cover alien races and …
69Cheshire Fire and Rescue Service — area Coverage Area Cheshire …
70Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I …
