Introduction
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What can APRS do ?
The Automatic Packet Reporting System was originally devised by Bob Bruninga (WB4APR) to transmit the position of mobile stations using a Mic Encoder - this device piggybacks a burst of packet data onto the end of a standard voice transmission. As the APRS protocol was extended, it allowed other information to be transmitted, such as:
- Short Text Messages, either sent to an individual callsign, or with the ability to support 'nets'; general bulletins, reporting the availability of resources on the network.
- Weather information from automated weather stations, typically reporting temperature; barometric pressure; wind speed and direction.
APRS also posesses the unique ability for a user to passively monitior network activity, making it an ideal introduction to digital modes for Shortwave Listeners.
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What do I need ?
If you have ever been active on packet radio, then you probably have all the equipment you
need already in your shack to set up a fixed station! The minimal APRS station consists of:
- APRS Software - UI-View available from Roger Barker - G4IDE's site.
- A PC - Anything from a 486/33 upwards will work.
- A TNC - most TNCs will work (I use a 1988 vintage Tiny-2).
- A 2m band Radio tunable to 144.800 MHz.
PC Weather Station
You could possibly extend your fixed APRS station, by interfacing it with a PC weather station - then by the addition of some software changes, make the weather data in your shack available via APRS to all local users.
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APRS Mobile
Alternatively, if you posses a laptop computer you could add a GPS and take your station on the road.
(Driving whilst operating a computer is not recommended and could result in the loss of more than your
driving license!).
Several implementations of Mobile APRS stations are available, both commercially (such as the TH-D7 from Kenwood) and as projects, discussed further within this document.
All of the above developments are supported by Roger Barker’s (G4IDE) UI-View program, which is available via the Internet. Although the unregistered 16-bit version is not limited in its functionality, please consider registering it. Not only does it represent a considerable effort on his part, but is probably the easiest to configure!
The registered version of UI-View also supports the gating of APRS data via the internet (IGATE). However, the exchange of APRS data via the internet requires a Note of Variation on the Holders’ Licence.