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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 ...
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
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.
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.
Selective Call Rejection; Selective Distinct; Selective Distinct Alert; Speak To Tweet; Speed calling *31; StarStar Mobile; U. Usage Sensitive 3 way call; V. Vertical ...
GMRS: 462.675 MHz is a UHF mobile distress and road information calling frequency allocated to the General Mobile Radio Service and used throughout Alaska and Canada for emergency communications; sometimes referred to as "Orange Dot" by some transceiver manufacturers who associated a frequency with a color-code for ease of channel coordination ...
As with many other developing countries, sex-selective abortion is a common practice in the region, with author Marjola Rukaj commenting, "If it's a male, all is well. If it's a female, there's a dilemma. In Albania selective abortion is a widespread practice. According to the Council of Europe, in Albania for every 100 females 112 males are ...
CCIR-tones, a selective calling system used in some radio communications systems in some European countries CCIR-1k and CCIR-2k , noise weighting standards for audio signals Commander's critical information requirement, a term in the US military