Kenwood_PG-4W_APRS_user操作说明书手册

APRSABOUT APRSThe Automatic Packet/Position Reporting System (APRS)was created by BobBruninga,WB4APR,of Maryland,U.S.A..Bob Bruninga is the president of APRSEngineering LLC,which owns the trademark for APRS.Bob created the APRSprotocol and developed a program called'APRSdos',which is the official name ofAPRS'.This program runs on the MS-DOS platform.The idea of APRS came about in the late 1970's,and it has been constantly updatedsince its initial release in 1992.Today,many licensed versions have been releasedfor many platforms (refer to page 4,'The APRS Program').Versions includeMacAPRS for the Macintosh,WinAPRS and APRSplus for Windows,javAPRSwritten in Java,and PocketAPRS which runs on the Palm Ill.One of the latest creations for APRS is the TH-D7.The TH-D7 is an APRS datacommunicator radio.The APRS protocol uses packet communications which are Unnumbered Information(Ul)frames.The packet contains the position,station data,status,and messagesThe position contains the latitude and longitude,the station data contains the station'sinformation(call sign,output power,etc.),weather information(temperature,windspeed and direction,etc.),etc.,the status is like your comment,and the messageis like e-mail.To enjoy APRS,you require a transceiver with a Terminal Node Controller(TNC),and an APRS program that runs on a personal computer.The TH-D7 has an internalTNC and also contains the APRS functions that are considered indispensable in aportable transceiver.For information on how to operate APRS on the TH-D7,referto page 12,'USING THE TH-D7 AS A SIMPLE APRS STATION'.The following section describes general usage of APRS on transceivers,TNCs,and personal computers.Return to Contents1