D-Star (AMBE Vocoder based)

The Australian D-Star Site: http://www.dstar.org.au/

Overview

D-Star was developed in Japan by the Japanese Amateur Radio League (JARL) 1999/2000 especially for ham radio and it became the leading system worldwide due to its clear and relative simple user interface. Voice is being transformed by the AMBE Vocoder into a compressed digital data stream of 3600 bits/s. In addition there is a data channel with 1200 bits/s for a total data rate of 4800 bits/s. This data signal modulates a carrier, so that a logical 0 is one frequency and a logical 1 a second frequency. This is called 2FSK (two frequency shift keying) or GMSK (which is the same, however the signal is modulated using a bell curve). This signal can be used to modulate most FM transceivers (via the packet radio socket). This is the reason why there are many home made D-Star solutions.

Three reflector systems are used for communication:

  1. DCS (most common),
  2. D-Plus, REF reflectors (mostly in English speaking countries), and the
  3. X-Reflector system which plays a minor role.
DV4mini enables communication on all these systems. D-STAR is also a trademark of Icom Incorporated in the United States and other countries. Some say you need to be able to read Japanese to understand the full specification.
Source: https://en.wikipedia.org/wiki/D-STAR - D-STAR on Wikipedia

D-STAR for the Technically Curious

This is a slideshow presented by By John D. Hays, K7VE john@hays.org presented at the Digital Communications Conference in Vancouver, WA, USA 24-26 September 2010. It is a quick overview of current development projects and building blocks for the D-STAR experimenter or integrator. It gives a good overview of the D-Star devices and project developemnt as of 2010.
There is alot of material on d-star here:
https://www.k6jm.com/dstarmenu.htm">https://www.k6jm.com/dstarmenu.htm

Open D-Star

The rocky road of software development is often difficult and fraught with perils, but persistance often wins rich rewards. Maybe, not so much for the developer, but certainly for the community of users. Here is an interesting account of such a journay undertaken by Scott Lawson KI4LKF and his peers and his successors in the developemt of Dextra, an open source D-Star protocol.

D-Star Open Source / Dextra project by Scott Lawson, KI4LKF

id="d-star-rep">D-Star Repeaters

D-Star Repeaters near to my QTH, QG62qi, from the "Repeater Book" mobile phone application:

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D-Star Gateway Applications

NI-STAR Open G2 IRCDDB based

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Reference Information

D-STAR System - Technical Requirements for the Wireless System:
http://www.dutch-star.eu/files/PDFs/D-STAR%20Protocol%20(EN).pdf

Homebrew D-Dtar By Bob Witte, K0NR A Look Inside D-Star Modulation.pdfb (local)
https://www.k6jm.com/downloads/k6jmDSTAR-Pacificon2013.pdf

http://www.qsl.net/kb9mwr/projects/dv/codec/Decoding%20AMBE+2%20in%20MD380%20Firmware%20in%20Linux.pdf

http://www.dutch-star.eu/links.aspx

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ircDDB - irc-based Distributed Database

ircDDB stands for “irc-based Distributed Database”. ircDDB is simply a network to exchange callsign and routing information between D-Star gateways. For more information on ircDDB see: ircDDBGateway.html

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20182018 - pre published v0.9