D-Star Operation (Basic); Unique Features Of D-Star; What Is D-Star - Icom IC-9700 Advanced Manual

9. D-STAR OPERATION (BASIC)

Unique features of D-STAR

• Easy Cross band operation through the
repeater
430 MHz 430 MHz
CQCQ CQCQ
• Easy call sign entry with the Repeater list or
TX/RX History

What is D-STAR?

• D-STAR is a digital protocol standard developed by the Japan Amateur Radio League (JARL). The system
includes the DV mode for Digital Voice and the DD mode for Digital Data communications.
• D-STAR supports a comprehensive repeater system linked through the Internet, enabling you to make QSOs
with stations near or far from your location.
• D-STAR supports the DV mode at 4.8 kbps. Your call sign data, and either a short message, or GPS data can
be transmitted simultaneously with your voice signal.
Advanced Amateur radio technology of D-STAR
The DV mode has a bandwidth of only 6 kHz, compared to 16 kHz for the analog FM mode, with 5 kHz
deviation.
D-STAR utilizes the well-know GMSK modulation method that makes very efficient use of occupied bandwidth.
D-STAR (F7W)
10 kHz 10 kHz
20 kHz 20 kHz
D-STAR occupies 10 kHz. The sound quality is
good even though the bandwidth is narrow.
Internet Internet
1200 MHz 1200 MHz
CQCQ CQCQ
fo
Frequency
6 kHz 6 kHz
10 kHz 10 kHz 10 kHz 10 kHz 10 kHz 10 kHz
20 kHz 20 kHz
• The Call Sign Capture key
sign capture easy!
FM (F3E)
10 kHz 10 kHz 10 kHz 10 kHz
20 kHz 20 kHz
The regular FM mode occupies 20 kHz that is a
double the bandwidth of D-STAR.
9-1
makes call
TONE
RX → CS
fo
Frequency
16 kHz 16 kHz
10 kHz 10 kHz 10 kHz 10 kHz
20 kHz 20 kHz