|D-STAR is a comprehensive digital protocol specification developed by the JARL.
It was developed to provide Amateur Radio a reliable, high quality, multi-purpose
digital mode for primary use on the VHF and above frequencies.
Digital Data (DD) is a 128 kbps Ethernet connection which can be used station-to-station
or station-to-network where the network can be the Internet or any other LAN or
WAN. Digital Data is offered on 1.2 GHz due to the bandwidth required.
Digital Voice (DV) is a 4800 bps GMSK transmission. 3600 bps is dedicated
to the AMBE voice data stream which includes forward-error-correction for highly
reliable and clear voice communications. The other 1200 bps is dedicated to
synchronization and a 900 bps low speed data stream. The low speed data stream
can be used for many things that are complimentary to the voice transmission such
as GPS information.
The pages to the right show D-STAR repeaters and activity on those repeaters.
This information is gathered real-time by each repeater shown. Also shown
is D-PRS activity. D-PRS makes use of the DV low speed data channel for communicating
D-STAR GPS information to the APRS world. More can be found on D-PRS at www.aprs-is.net