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D-STAR
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D-STAR (Digital Smart Technologies for Amateur Radio) is a digital voice and data protocol specification developed for use in amateur radio. D-Star compatible radios are available on VHF and UHF amateur radio bands. In addition to the over-the-air protocol, D-Star also provides specifications for network connectivity, enabling D-Star radios to be connected to the Internet or other networks. D-STAR is the result of research by the Japan Amateur Radio League to investigate digital technologies for amateur radio. To date, other than ICOM - no other amateur radio equipment manufacturer has chosen to include D-Star technology. History1999 – Funded by the Japanese government and administrated by the JARL, investigation was put into finding a new way of bringing digital technology to amateur radio. 2001 – D-Star is published as the result of the research. Unknown Date – Icom enters the construction of the new digital technology by offering the hardware necessary to create this technology. Unknown Date – The conclusion of all this work is the digital technology for amateur radio called D-Star.[1] Technical detailsD-STAR transfers both voice and data via digital encoding over the 2 m (VHF), 70 cm (UHF), and 23 cm (1.2 GHz) amateur radio bands. Voice is encoded as a 3600 bit/s data stream using proprietary AMBE encoding, with 1200 bit/s FEC, leaving 1200 bit/s for data encoding. On air bit rates are 4800 bit/s over the 2 m, 70 cm and 23 cm bands. Digital only data can be sent at 128 kbit/s only on the 23 cm band. Radios providing data service use a RS-232 or USB connection for low speed data (1200 bit/s) and Ethernet for high speed (128 kbit/s) connections to allow easy interfacing with computer equipment.[2]
Importance of Digital Technology and D-STARAs long as the signal strength is above a minimum threshold, the quality of the data received is better than an analog signal at the same strength. Graph supporting evidence of this[[1]] Capable to linking repeaters together and through the Internet. May talk to another HAM radio in a different state. Another important aspect of D-STAR technology is its ability to send large quantities of data to emergency responders in the event of a disaster. Served agencies can instantly relate to sending "email" or a "word files" to someone. The data sent can be high-volume, where traditional amateur radio "modes" are capable of getting a message through albeit slowly, D-STAR can place documents into the hands of those that need them most - fast image, text and document data exchanges. Gateway ControlThe gateway control software rs-rp2c, runs on Fedora Core 2+ or Red Hat Linux 9+ OS on a Pentium grade 2.4 GHz or faster machine. The machine running the gateway control software contains two NICs. A Router such as the WRV54G from LINKSYS connects into the two NICs. Gateway control softwareThe RS-RP2C CD consists of dstar-xxxx.tar.gz (XXXX=revision number). Within that are the config files, dsgwd.conf, dsipsvd.conf and startup script. Manufacturers of D-STAR Equipment
Equipment
Compatible programs and online projects[D-StarLet] (Open source, Client-server, Win98, Linux, Mac) [Interface D-PRS Interface] (Open source, GPS) [DStarMonitor], [DStarQuery], [d*Chat] (Open source) D-StarLetA web-based text messaging application using D-Star digital data technology[7][8] D-StarLet is an open source client-server solution that allows content creation and modification from certain persons. D-StarLet interfaces with a D-Star radio through the serial port. It works with Windows (98+), Linux (Red Hat 7.3+), Apple Mac (OS 10.1+), etc. D-PRS InterfaceD-PRS is GPS for HAM Radio. Includes DStarTNC2, javAPRSSrvr, DStarInterface, and TNC-X[7] DStarMonitorA Java application run on the repeater gateway PC which logs activity on the attached repeaters. Additional features include APRS object representation of each repeater.[7] DStarQueryDStarQuery monitors the low-speed data stream of a D-STAR radio looking queries sent from a remote station. When a valid query is received, a predefined sequence is executed and the results transmitted from the station running DStarQuery. For example, a station transmits "?D*rptrs?" and it is received by a DStarQuery station which responds with a list of local repeaters.[7] The program D-PRS Interface includes a "Query" entry field that streamlines this process allowing the user to simply enter the desired command. Most DStarQuery systems will respond with a list of available commands when "?D*info?" is received. d*ChatA simple "instant message" or keyboard-to-keyboard chat application for DV mode.[7] Home Brew D-Star RadioThe first presumed D-Star radio including pictures and diagrams can be found at Moetronix.com's Digital Voice Transciever Project. This page includes the schematic, source, and whitepaper. Another project is one involving a DV adapter using the UT-118. This project involves interfacing the UT-118 by ICOM with an ordinary HAM radio. If this project in indeed a success then that will mean that most or all HAM radios out there will be able to communicate digitally with D-STAR radios. http://d-star.dyndns.org/rig.html.en References
JournalJournals with D-STAR relevant information and a brief description
MediaMedia with D-STAR relevant information and a brief description
United States D-Star Support Groups
See alsohttp://groups.yahoo.com/group/vk-dstar/ Amateur Radio Emergency Service (ARES) using D-STAR http://youtube.com/watch?v=q8dUJp0rc0g External links
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