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  2. Swedish Rhapsody (numbers station) - Wikipedia

    en.wikipedia.org/wiki/Swedish_Rhapsody_(Numbers...

    The Sprach-Morse Generator, the machine mistaken for a young girl speaking in German. Swedish Rhapsody was a Polish numbers station, operated by the Ministry of Public Security (later Office of State Protection and Foreign Intelligence Agency) that used AM broadcasting and operated between the late 1950s and 1998. [2]

  3. Numbers station - Wikipedia

    en.wikipedia.org/wiki/Numbers_station

    The Speech/Morse generator (pictured here) is a machine that has been used for many well-known numbers stations. The frequently reported use of high-tech modulations like data bursts, in combination or in sequence with spoken numbers, suggests varying transmissions for differing intelligence operations. [36]

  4. The Conet Project - Wikipedia

    en.wikipedia.org/wiki/The_Conet_Project

    The Conet Project was rereleased in a five-disc 15th anniversary edition in April 2013 with a new booklet, featuring detailed photographs of a numbers station voice sample controller, a Sprach-Morse-Generator der HVA des MfS (Hauptverwaltung Aufklärung des Ministeriums für Staatssicherheit der DDR) and one-time pad samples of the type used by the East German Stasi.

  5. Emergency Alert System - Wikipedia

    en.wikipedia.org/wiki/Emergency_Alert_System

    The relayed audio included the hosts' reactions and laughter to the clip. [121] On February 28, 2017, WZZY in Winchester, Indiana was hacked in a nearly-identical manner, playing the same "dead bodies" audio from the February 2013 incidents. The incident prompted a public response from the Randolph County Sheriff's Department clarifying that ...

  6. Morse code - Wikipedia

    en.wikipedia.org/wiki/Morse_code

    This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2] Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3][4] Morse code is named after Samuel Morse, one of the early developers ...

  7. Beat frequency oscillator - Wikipedia

    en.wikipedia.org/wiki/Beat_frequency_oscillator

    Beat frequency oscillator. In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy (CW) transmissions to make them audible. The signal from the BFO is mixed with the received signal to create a heterodyne or beat frequency which is heard as a tone ...

  8. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    An 1860s-era siren. [ 2 ] A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. There are two general types: mechanical and electronic.

  9. 11B-X-1371 - Wikipedia

    en.wikipedia.org/wiki/11B-X-1371

    Country. Poland. 11B-X-1371 is a 2015 viral video sent to GadgetZZ.com, the Swedish tech blog that publicized it. The black-and-white segment is two minutes in length; its title came from the plaintext of a base64 string written on the DVD. It depicts a person wearing what appears to be a plague doctor costume walking and standing around in a ...