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The Wow! signal represented as "6EQUJ5". The original printout with Ehman's handwritten exclamation is preserved by Ohio History Connection. [1]The Wow! signal was a strong narrowband radio signal detected on August 15, 1977, by Ohio State University's Big Ear radio telescope in the United States, then used to support the search for extraterrestrial intelligence.
By the 1970s most police and fire services had their own dedicated radio setups, and personal radios (referred to as PRs) were beginning to be rolled out to the police in most towns and cities. Home Office radio was furthered towards the end of the Cold War, with having a communications network that was independent of the then Post Office ...
A duress code is a covert distress signal used by an individual who is being coerced by one or more hostile persons. It is used to warn others that they are being forced to do something against their will.
Radio communications, prior to the advent of landlines and satellites as communication paths and relays, was always subject to unpredictable fade outs caused by weather conditions, practical limits on available emission power at the transmitter, radio frequency of the transmission, type of emission, type of transmitting antenna, signal waveform characteristics, modulation scheme in use ...
100–10 km: Navigation, time signals, communication with submarines, landline telephony, wireless heart rate monitors, geophysics: Low frequency: LF: 5: 30–300 kHz 10–1 km: Navigation, time signals, AM longwave broadcasting (Europe and parts of Asia), RFID, amateur radio. Medium frequency: MF: 6: 300–3,000 kHz 1,000–100 m
Map showing the numeral codes for amateur radio call signs in the United States. The region in which the operator was licensed determines the numeral. United States amateur radio call signs consist of one or two letters, followed by a single digit, and closing with one to three more letters. [ 21 ]
SOS is a Morse code distress signal ( ), used internationally, originally established for maritime use.In formal notation SOS is written with an overscore line (SOS), to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. [1]
10-32 Radio check 10-33 Emergency traffic, clear the channel. CB code for Mayday for trucks and police cars. 3s and 8s Well wishes to a fellow driver. Borrowed from amateur radio telegraphy codes "73" (best regards) and "88" (hugs and kisses). 10-36 Correct time ("Can I get a 10-36?") 10-41 Driver is signing on or changing the channel on their ...