IGate

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*[http://www.aprs-is.net/igates.htm IGate Implementations]
 
*[http://www.aprs-is.net/igates.htm IGate Implementations]
 
*[http://www.aprs-is.net/igatecfg.htm IGate Specifications]
 
*[http://www.aprs-is.net/igatecfg.htm IGate Specifications]
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*[http://www.aprs-is.net/q.htm Q Construct (Injection ID)]

Revision as of 09:53, 26 November 2007

Contents

Internet Gateway: IGate

An IGate is a type of gateway APRS station. It is similar to a network router in the TCP/IP world. It's job is to selectivly allow packets to cross between the APRS-IS and the local RF network.

An IGate will require the following capabilities:

  • RF receive and optionally send
  • TNC
  • Internet access and a connection into APRS-IS
  • A computer or processor of some sort to implement the IGate operation

IGate implementations have to conform to the standards expected by the APRS-IS system.

RF --> APRS-IS

Going from RF to APRS-IS is the simpler of the two operations. The IGate station needs to successfully connect to APRS-IS which requires a rudimentary password. Packets received via RF are sent out on the APRS-IS side. IGate implementations take care of reformatting the packet for the APRS-IS.

APRS --> RF

Gating to the RF side is a little trickier. The technical parts are not difficult but the limitations of the RF channel and regulatory restrictions attendant with radio transmissions make things more difficult. Many IGate implementations will only send to RF those packets destined for stations that have been recently heard on the RF side or that are in a list of desgnated destination stations. As an IGate operator you are responsible for the content of the packets transmitted by your station on RF.

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