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Computers in Amateur Radio

10.

D-Star

by Dave Thomas, 2W0RUH

Contrary to widespread belief, Digital Smart Technologies for Amateur

Radio (D-Star) is a communications standard, not a brand name.

Moreover, it is not limited to one manufacturer. It was released in

2001, having been developed and funded by the Japanese Ministry of

Post and Telecommunications, who were tasked to investigate digital

technologies for amateur radio. The committee included representa-

tives of the Japanese amateur radio manufacturers, including Icom,

plus other observers.

The standard is published by JARL, but it is an open system,

which means that any equipment complying with the standard can

use it. It is a two part communications system, the first being formed

by radio-to-radio transmissions - either direct or via a standalone

repeater - and the second deemed to be the ‘spine’ (or backbone) of

the system is by integrating with the Internet via ‘gateways’ to the

wider amateur community. The D-Star standard also controls the way

in which the signal is relayed, by converting voice to and from digital

format. This digital exchange takes place by the use of the AMBE

(Advanced Multiple Band Encoding) codec (‘codec’ being short for

coding/decoding).

The early days

Initially you were only able to operate on D-Star (simplex range ex-

cepted) by purchasing Icom factory-built repeaters, but since then

many new ways of entering and using the system have surfaced.

To encourage people to adopt D-Star, Icom offered discounted

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