- #SELECTIVE CALL TONE DECODER PDF#
- #SELECTIVE CALL TONE DECODER REGISTRATION#
- #SELECTIVE CALL TONE DECODER CODE#
Original Assignee Rockwell International Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Werth Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/593,792 Inventor Willard F.
#SELECTIVE CALL TONE DECODER PDF#
Google Patents Selective calling decoderĭownload PDF Info Publication number US4818989A US4818989A US06/593,792 US59379284A US4818989A US 4818989 A US4818989 A US 4818989A US 59379284 A US59379284 A US 59379284A US 4818989 A US4818989 A US 4818989A Authority US United States Prior art keywords frequency output tone input coupled Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Therefore, SELCAL should not be used as a substitute for proper voice identification procedures.- Google Patents US4818989A - Selective calling decoder
#SELECTIVE CALL TONE DECODER CODE#
However, there are occasions when multiple aircraft having the same SELCAL code may be operating in the same control area, and may respond to the same SELCAL transmission. Where possible duplicate codes are assigned to aircraft operated in widely separated areas of the world, and usually do not have the same HF radio frequency assignment. The number of SELCAL codes registered has now increased to 35,000 SELCAL code assignments, over three times the number of available unique SELCAL code combinations. This shortage has required re-use of the same code by more than one aircraft. Given the growth in the demand for SELCAL codes, there is a shortage of available 4-letter codes. ASRI is now the official ICAO SELCAL Registrar for all SELCAL codes worldwide. In 2006, the ARINC section responsible for SELCAL was re-structured into a separate company called Aviation Spectrum Resources, Inc. From that point, ARINC became the official registrar of SELCAL codes, accepting all SELCAL applications directly, as well as providing an annual report to ICAO with a summary of SELCAL usage.
#SELECTIVE CALL TONE DECODER REGISTRATION#
Shortly after the introduction of SELCAL Operations, ICAO formally transferred the SELCAL registration and management functions to Aeronautical Radio Incorporated (ARINC). SELCAL began use in civil aviation in 1957 under the direction of ICAO. Despite the increasing capability of aircraft satellite communications, traditional radio communications with SELCAL remain in extensive use for delivering Air Traffic Control (ATC) messages and other aviation communications to aircraft in remote areas.įor more information, please see How SELCAL Worksįor SELCAL applications, please use the Online SELCAL Application This means aircrew are alerted to a request for communications without having to listen continuously to messages for other aircraft. SELCAL works by each aircraft being assigned a different 4-character SELCAL code that allows airlines and communication providers to contact a specific aircraft on a common radio voice frequency. Selective Calling (SELCAL) is an International Civil Aviation Organization (ICAO) managed communications method used to notify aircraft that a ground radio station wishes to communicate.
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