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zondag, 11 januari 2009 21:28

What is APRS?

APRS stands for Automatic Position Reporting System and canceled an additional application is based on packet data transmission, and the early 90s was developed by the American amateur Bob Bruninga WB4APR.  This mode has been several years a very strong global growth in number and potential users.

Each station participating in APRS sends out a beacon containing its location information. The data packets via UNPROTO (unaddressed) with 1200 Baud sent. Je kunt met APRS ook korte berichten versturen en ontvangen. You can use APRS also send and receive short messages. When sending messages or make use of a call sign and you get an acknowledgment (ACK) of your message.  Except that it is the position of an APRS station there with more things to do like sending the current weather conditions and the possibility of RDF.  Depending on the creative mind of the user can be any data on the APRS network encounter. Because it is by digipeaters packets are received and re-broadcast is possible very large distances.

With APRS you using simple (free) software immediately see the current location of your fellow amateur radio, both based, mobile or portable. Moving stations are perfect to follow, provided in a mobile GPS receiver is connected directly to the transceiver (eg Kenwood TH-D7 or TM-D700), or a TinyTrak module.  In this way the x - number of time a beacon sent with the correct current position. These beacons are received in the shack received by the transceiver and link to the PC you use the right software always remain aware of the position of your counterpart. So keep in mind that if you participate in APRS anywhere you see / are followed and if an Internet link is active it is not limited to your local region but the world can anyone follow you.

Also there are some additional options.
There are "beacons" broadcast (even projected at a different location) eg for special events, hambeurzen ... to announce their exact location and display. O It is also possible to reports of some amateur weather stations to request (wind speed, wind direction, temperature, ...). And during emergency situations or radio APRS a very strong role to play because each station is mapped, and immediately the right person for the right location can be sent. A fun application is also sending short messages from one station to another.

The APRS system is so for several reasons other than the packet network, for the following:

  • Maps and other information displays can be used to send and receive positions of fellow amateurs, weather stations, events, ...
  • 1 system that handles all communication, so that everyone is immediately aware of a situation
  • It uses generic digipeating, so that little or no networking knowledge required
  • There is support for intelligent call digipeating sign-in replacement for storms that the network is not overloaded and / or overloaded (it can also just by using the correct settings!)
  • By using the AX.25 UI-frames is also support for spreading messages, bulletins and announcements with a rapid spread through the whole network
  • It is supported by such warranties Kenwood (TH-D7 or TM-D700 portable),) with built-in TNC and APRS firmware.

APRS shows that using packet radio a tactical real-time communication and presentation system is available for general activities, but at least as useful in emergencies.  An unlimited number of stations can use the network, which only drives that have something in the information transmission network, and all users will receive information in real time and save.

Thanks to GPScenter.be the text above.

Laatst aangepast ( dinsdag, 15 september 2009 18:42 )
 
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