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(Corporation) The Japanese amateur radio union (JARL) with, the next generation communication commission (old: The technical commission next generation communication sub-panel) is center and does examination concerning " digitalizing and networking the amateur radio ".

With the JARL, " D-STAR ", it called " the digitalization of this amateur radio and networking system " had decided to call the propulsion project " JARL D-STAR project ".

< Digital communication of former amateur radio >

When you mention " digital communication of the former amateur radio", the X of protocol for wire communication. The AX which improves 25 to the one for amateur radio. The packet transmission which uses 25 is typical. As for former amateur packet transmission, modem of AFSK system and PSK system was used, the transmission speed the 300bps, the 1200bps and the 9600bps was main current.
That time when packet transmission of the amateur radio becomes popular, the personal computer communication which uses the public circuit the 300bps - the 1200bps with main current, as for packet transmission of the amateur radio, in comparison with general personal computer communication had guaranteed the transmission speed which completely is not the unfavorable comparison present.
This packet transmission spread widely with the V / UHF band as a main current. There is no either thing which designates the connection charge of the communications network as the air and because you can use, the it increased footlights thickly between the amateur radio house. The method which begins the amateur radio from the technical interest that " we would like to try doing packet transmission ", they seem the many ways.
Packet transmission after that furthermore accomplished evolution with the volunteer of the love person and the transfer type system (the Foward BBS) was constructed by the Japanese entire country, data transfer on a nationwide scale became possible. On one hand, also the short wave band and network on of a worldwide scale which uses the amateur satellite being established reached the point of.

< From personal computer communication those which to Internet * & * acceleration and digitalization bring >

Also personal computer communication starts taking root widely generally, large-scale networking of the BBS of commercial business advances, but furthermore, Internet spreads quickly in the kind of form which takes in everything, former personal computer communication keeps moving to the style, Internet access.
The communication speed of modem, 2400 -> 9600 -> 14400 -> 28800 -> 33600 -> the 56000bps and, yearly the transmission speed kept improving.
Furthermore, also digitalization of the public network going hand in hand, Integratted Services Digital Network spreads, with former AFSK system the 64kbps which tears the wall of the difficult 56kbps / communication of 128 K bps becomes possible, furthermore presently, the technology such as the CATV and the DSL spreads, high-speed data communication of the Mbps unit has become possible.
This way as acceleration of transmission speed (broadband conversion) advances, data communication came to the point of with keeping including the various media such as the picture and sound.

Opportunity to the digitalization which advances < even in the world of the amateur radio >

While spread of Internet and acceleration of transmission speed advance, compared to the advanced ham which requests the communication of high velocity repeats trial manufacture and experiment even in the world of the amateur radio, pursues the possibility of high-speed data communication and networking of the amateur radio.
Presently, the high-speed data transmission by Internet as when it has spread " the media which began the picture and sound, includes various information " similar, regarding the amateur radio, there is a possibility where you can discover the style of the new communication where by the fact that digitalization and networking whose high velocity transmission is possible are assured, various information were included.
It went back and forth various examination even at JARL next generation communication commission concerning digitalizing and networking the amateur radio.
It examined at the next generation communication commission, it is as mentioned below concerning the digitalization of the amateur radio and the schematic design of network.

We would like to do data communication at transmission speed of the 64kbps - the 128kbps.
It makes the system which considers the affinity of Internet sufficiently.
It examines also the digitalization of speech communication, would like to actualize the repeater of new system.
We would like to link plural repeater bureaus with digitalization.
Converting also existing analog FM communication and the like digitally at repeater bureau, try to be able to utilize the new system.

< System * image >

As for " elementary knowledge in order to challenge to the D-STAR " this