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Selective calling features fit into two major categories—individual calling and group calling. Individual calls generally have longer time-constants: it takes more air-time to call an individual radio unit than to call a large group of radios. Selective calling is akin to the use of a lock on a door. A radio with carrier squelch is unlocked ...
In international aviation, SELCAL or SelCal is a selective-calling radio system that can alert an aircraft's crew that a ground radio station wishes to communicate with the aircraft. SELCAL uses a ground-based encoder and radio transmitter to broadcast an audio signal that is picked up by a decoder and radio receiver on an aircraft.
Selcall (selective calling) is a type of squelch protocol used in radio communications systems, in which transmissions include a brief burst of sequential audio tones. . Receivers that are set to respond to the transmitted tone sequence will open their squelch, while others will remain
Selective call waiting *63 1163 Selective call forwarding *65 1165 Calling number delivery activation *66 1166 Continuous redial *67 1167 Calling number delivery blocking 1831 #31# [4] [5] 141 #31# [6] *68 1168 Activate call forwarding on busy *69 1169 Last-call return (incoming) *69 HFC *10# [7] [8] 1361 1363 [9] 1471 [10] *70 1170 Call ...
MDC signaling includes a number of features: unit ID, status buttons, emergency button, selective inhibit, radio check, and selective calling. These features are programmable and could be used in any combination desired by the user.
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The Selective Service System was first founded in 1917 to feed bodies into America's World War I efforts. It was disbanded in 1920, fired back up in 1940, re-formatted in 1948, and then terminated ...
One common type of CCIR selcall used in VHF and UHF FM two-way radio communications, is a 5-tone selective calling system mainly found in some European countries and used by the Swedish Police and the Turkish Police. The tone duration of a 5 tone CCIR selcall is 100 milliseconds (± 10 ms) and the tones are transmitted sequentially.