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== Overview ==
== Overview ==
⚫
D-STAR allows you to connect your laptop to your D-STAR compliant radio and talk to other D-STAR complaint radios with a program like telnet. One of the D-STAR compliant radios will need to act as a server for this to work.
D-STAR is an open protocol although it is published by the [[Japan Amateur Radio League]] (JARL), it is available to be implemented by anyone. While Icom is the only company to date that manufactures D-STAR-compatible radios, any equipment or software that supports the D-STAR protocol will work with a D-STAR system. D-STAR systems can be built using both commercial and homebrew equipment and software.
In a D-STAR system, the air link portion of the protocol applies to signals travelling between radios or between a radio and a repeater. D-STAR radios can talk directly to each other without any intermediate equipment or through a repeater using D-STAR voice or data transceivers. The gateway portion of the protocol applies to the digital interface between D-STAR repeaters (see figure 1). D-STAR also specifies how a voice signal is converted to and from streams of digital data, a function called a codec. The D-STAR codec is known as AMBE® (Advanced Multi-Band Excitation) and the voice signal is transmitted in the D-STAR system at 3600 bits/second (3.6 kbit/s).<ref name="icom-dstar2">{{cite web | url=http://www.icomamerica.com/amateur/dstar/dstar2.asp | title=What is D-STAR | publisher=[[Icom]] America}}</ref>

<!-- May now be redundent. Was explained at the top.D-STAR like cellphones uses digital voice technology, which allows you to talk further away. This is much better than analog that has difficulties when --><!-- was "with" -- AE7Q --> <!--parts of the analog signal is lost.-->

⚫
D-Star allows you to connect your laptop to your D-STAR compliant radio and talk to other D-STAR complaint radios with a program like telnet. One of the D-STAR compliant radios will need to act as a server for this to work.

== Specific features ==
<!-- My other HAM radio has this 'pager feature' which may explain why I wasn't liking this much. Some radios with D-STAR have a pager feature that lets someone page you with their radio. This is great because we aren't always at our radio. The ICOM D-Star compliant radio, ID-800H has this feature.--><!-- typos corrected -- AE7Q -->

<!-- Has the word 'author' which I was trying to get rid of. Will look at it in the morning D-Star radios have a feature that lets you send digital messages to one another. A digital message can be programmed into the radio so that you can send your message while driving.-->

''"It’s only natural that D-Star’s digital voice capabilities will be linked up with the most popular repeater sharing applications, EchoLink® and IRLP. Since your voice is already digitized within the D-STAR system, third party bridges and converters to and from other digital voice systems an obvious and expected future addition."''<ref>{{cite web | url=http://www.icomamerica.com/amateur/dstar/dstar5.asp | title=What can D-STAR do for me? | publisher=ICOM America}}</ref>

== History ==
D-STAR, a standard published in 2001, is the result of three years of research funded by the Japanese government and administered by the JARL to investigate digital technologies for amateur radio. The research involved Japanese radio manufacturers and other observers. Icom provided the equipment used for development and testing. D-STAR radios and repeaters have been tested extensively and are now ready for public use.<ref name="icom-dstar2" />

== Technical information ==
<!-- JDOS2; I found some information on the topics you mentioned if you or anyone else wants to add more information or make it more complient to the wiki then feel fre. Otherwise I'll continue to modify it. Thanks for the suggestions! -->
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Digital Voice System’s AMBE-2020™ Vocoder Chip is an extremely flexible, high -performance half-duplex voice compression solution that provides exceptional voice quality at rates as low as 2000 bps. The AMBE-2020™ Vocoder Chip is a low cost, DSP-based voice codec for half-duplex real and non-real time voice compression applications.

The AMBE-2020™ Vocoder Chip implements DVSI’s patented AMBE® Voice Compression Algorithm. The field-proven success of this technology has resulted in its recognition as the standard for voice quality in communication systems around the globe. Satellite systems such as Iridium, ICO, Inmarsat, Thuraya, ACeS, Optus and AMSC/TMI use this technology because of its superior voice quality at low bit rates.

DVSI has packaged this advanced vocoder technology onto a <!-- May need to be defined more -->proprietary chip from the world’s leading DSP manufacturer. This single-chip solution achieves a level of performance and reliability typically associated only with customized ASICs but without the risks and <!-- Would be nice to know how much -->high-development costs.

DVSI developed the AMBE-2020™ Vocoder Chip to offer the latest AMBE® Voice Compression Technology with no licensing fees, royalties or the engineering expense typically associated with custom DSP software implementation. With small quantity off-the-shelf <!-- Using what -->availability, this DSP provides low-risk cost-effective voice compression.

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Quote from: http://www.dvsinc.com/products/a2020.htm on June 14, 2006 9:00PM PST

Voice samples
[http://en.wikipedia.org/wiki/Image:forig.wav Original]
[http://en.wikipedia.org/wiki/Image:f2400.wav After (This is what D-Star may sound like)]
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What does this mean to the end user?
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D-Star is a voice over data protocol being targeted for Amateur radio service - the idea being to digitize the voice, vocode it to a low data rate signal, then transmit that over 2 meter FM to a second radio, where it is decoded and played back. The supposed advantages of this are:
Longer range - the voice signal does not degrade as it does with narrowband FM as the signal gets weaker.
Narrower bandwidth - the D-STAR modulation fits within a 12.5 kHz channel spacing.
Simultaneous voice and data - the system has a 1200 bps data channel in addition to the voice signal.
High data rate (128kBit/sec) on the 1.2GHz band.
No distortion of the voice as it goes over a repeater - you don't get the "cascaded c-weight filters" you can get in some repeater systems.
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http://technocrat.net/d/2006/4/5/2084 wowbagger Wed, 05 Apr 2006 09:35:13 PDT Taken at July 14, 2006 at 9:12PM from we6jbo.
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==Equipment==
==Equipment==

Revision as of 18:40, 25 July 2006

You must add a |reason= parameter to this Cleanup template – replace it with {{Cleanup|June 2006|reason=<Fill reason here>}}, or remove the Cleanup template.

D-STAR stands for Digital Smart Technology for Amateur Radio. The purpose of D-STAR is to allow HAM Radio operators to speak further and clearer using digital voice while sending data from 1200 BPS on up at the same time. The D-STAR system covers communications on HF, VHF, and UHF radio bands while defining interfaces for both radios, repeaters, Internet interconections, and PC interfaces.

Overview

D-STAR allows you to connect your laptop to your D-STAR compliant radio and talk to other D-STAR complaint radios with a program like telnet. One of the D-STAR compliant radios will need to act as a server for this to work.

Equipment

Although Icom is the first to support D-STAR, any company can produce equipment to support this protocol. The equipment known to interoperate with D-STAR systems includes:

  • Radios[1]
    • ICOM ID-1 - 1200MHz (23cm) Digital Tranceiver
    • ICOM ID-800H - VHF (2m) & UHF (70cm) Digital Tranceiver
    • ICOM IC-91AD - VHF & UHF Tranceiver
  • Repeaters
    • ICOM ID-RP2V - 1.2GHz (23cm) Voice Repeater
    • ICOM ID-RP2D - 1.2GHz (23cm) Data Repeater
    • ICOM ID-RP2000V - UHF (70cm) Voice Repeater
    • ICOM ID-RP4000V - VHF (2m) Voice Repeater

See Also

References

  1. ^ "Amateur Equipment". ICOM Worldwide.


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