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| APRS Calling ： ウィキペディア英語版 |
APRS Calling
APRS Calling is a manual procedure for calling stations on APRS to initiate communications on another frequency, or possibly by other means. It is inspired by Digital Selective Calling, a part of the Global Maritime Distress Safety System.〔Brehaut, Denise. ''GMDSS A User's Handbook''. Bloomsbury Publishing Plc, 2009, p. 35.〕〔Bass, Richard K. ''GMDSS A study guide for the Global Maritime Distress Safety System''. Tele-Technology, 2007, p. 9-1.〕 It also builds on existing digital procedures inherited from morse code and radioteletype operation.〔Combined Communication Electronics Board (CCEB). ''Communications Instructions ACP 131 (F) Operating Signals''. Combined Communications-Electronics Board, 2006, p. 2-25.〕 ITU Q codes are used in conjunction with APRS text messages to implement APRS calling. APRS calling is intended to complement monitoring voice calling frequencies.
==Procedure==
#The calling station sends a QSX signal to the station or group they wish to reach using an APRS text message. The QSX should include the necessary information for contact, possibly including frequency and mode.
#Once the called station or stations are ready to communicate on the specified channel, they answer using a QSX text message on APRS.
#The stations shift communications to the arranged channel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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