Technical Information
In its most widely used form, APRS is transported over the AX.25 protocol using 1200 bit/s Bell 202 AFSK on frequencies located within the 2 meter amateur band.
Sample APRS VHF frequencies
- 144.390 MHz – Colombia, Chile, Indonesia, North America
- 144.575 MHz – New Zealand
- 144.660 MHz – Japan
- 144.800 MHz – South Africa, Europe, Russia
- 144.930 MHz – Argentina, Uruguay
- 145.175 MHz – Australia
- 145.570 MHz – Brazil
- 145.525 MHz – Thailand
An extensive digital repeater, or "digipeater," network provides transport for APRS packets on these frequencies. Internet gateway stations (IGates) connect the on-air APRS network to the APRS Internet System (APRS-IS), which serves as a worldwide, high-bandwidth backbone for APRS data. Stations can tap into this stream directly, and a number of databases connected to the APRS-IS allow web-based access to the data as well as more advanced data-mining capabilities. A number of low-earth orbiting satellites, including the International Space Station, are capable of relaying APRS data.
Read more about this topic: Automatic Packet Reporting System
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