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D-Star Technical Specification

The following table compares D-STAR capabilities with those of VHF packet for both low-speed and high-speed systems. High-speed D-STAR links provide approximately 10 times the performance of high-speed packet at less than three times the price.
DATA SPEED DV: 1200 bps (net 950 bps)
DD: 128k bps (net 90k bps)
LS: 1200 bps
HS: 9600 bps
DV: 6kHz
DD: 150kHz
20 kHz
DV: Any VHF/UHF band
DD: 1.2 GHz
Any VHF/UHF band

Software and system developers want to know the detailed technical specifications and the following table illustrates the main points of the D-STAR system.

DV: Digital Voice + Data DD: High Speed Data LS: Low Speed Data HS: High Speed Data
DV: RS-232 or USB 1.0
DD: Ethernet
Same as Ethernet
7-bit ASCII text
D-STAR packet format and 0.5GMSK
LS: AX.25 using Bell 202 modulation
HS: AX.25 using K9NG Bell 212A
DV: Transparent point-to-point
AX.25 of TCP/IP

Data Interface

For low-speed DV D-STAR* links (1200 bps), the data interface to your laptop or terminal is a familiar RS-232, three-wire connection (Rx data, Tx data, and signal ground) or a USB 1.0 interface, depending on the radio. For high-speed D-STAR* (128k bps), the data interface is an Ethernet connection with the customary RJ-45 jack.

Air link

Over the air, packet signals use FSK protocols originally designed for land-line applications and adapted to amateur radio. D-STAR* uses the up-to-date modulation method of 0.5GMSK--Gaussian Minimum Shift Keying. GMSK provides improved performance over packet because it is designed for wireless links. Data is sent using the D-STAR* packet format, which includes FEC (Forward Error Correction) and routing information. The data itself is encapsulated within the D-STAR* packet as an Ethernet packet.

Network and transport

Low-speed DV D-STAR* data is a "keyboard-to-keyboard" mode. The D-STAR* system provides reliable, transparent transport from user to user by using CRC error detection. High-speed DD D-STAR* data appears at the data interface as an Ethernet packet suitable for encapsulation by the TCP/IP protocol stack. The Ethernet connection is a bridged, point-to-point connection between static IP addresses so that standard Internet application software can be used to transfer data across the D-STAR* system.

(*Digital Smart Technology for Amateur Radio)

Please also visit our other market specific sites, Icom (UK), Marine Radio, dPMR (digital Private Mobile Radio), Amateur Radio, DSC Handheld and IP Radio Systems

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