obust Packet Radio (RPR) Tracker / DSP TNC The “Tracker / DSP TNC” combines the functions of an intelligent APRS1 position and telemetry tracker with a universally applicable AX.25-“Packet Radio” TNC. As a special outstanding feature, the modem can use the waveform “Robust Packet Radio” (RPR) and thus allows unlimited operation via shortwave, i.e. over very long distances. RPR distinguishes itself with its high resistance to typical shortwave signal distortion. Typical uses are position tracking of vehicles, ships and even aircraft. For this the Tracker is connected with a GPS receiver. The sent data can be processed at the base www.scs-ptc.com www.robust-packet.net station with special software and (for example) displayed on the internet. Using the AX.25 function for example, e-mails can be exchanged via a worldwide network of open “RMS” servers, or over a private SCSmail server. The small, attractive metal case, as well as the optically decoupled USB port, are the guarantees for good passive as well as active resistance against high frequency infl uence, and ensure reliable long-term operation. Support for the KISS protocol allows the use of “Tracker / DSP TNC” with a great number of compatible programs.